US20050272615A1 - Polymeric thickeners for oil-containing compositions - Google Patents

Polymeric thickeners for oil-containing compositions Download PDF

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US20050272615A1
US20050272615A1 US11/199,049 US19904905A US2005272615A1 US 20050272615 A1 US20050272615 A1 US 20050272615A1 US 19904905 A US19904905 A US 19904905A US 2005272615 A1 US2005272615 A1 US 2005272615A1
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oil
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temperature
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Steven Bitler
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q19/00—Preparations for care of the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • A61K8/8152—Homopolymers or copolymers of esters, e.g. (meth)acrylic acid esters; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • A61K8/8158—Homopolymers or copolymers of amides or imides, e.g. (meth) acrylamide; Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
    • A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • A61K8/817—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions or derivatives of such polymers, e.g. vinylimidazol, vinylcaprolactame, allylamines (Polyquaternium 6)
    • A61K8/8182—Copolymers of vinyl-pyrrolidones. Compositions of derivatives of such polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/54—Polymers characterized by specific structures/properties

Definitions

  • This invention relates to polymeric thickeners for oil-containing compositions.
  • oil-containing compositions can be thickened with crystalline polymers which contain long chain alkyl groups in side chains but which are substantially free of functional groups.
  • this invention provides a method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
  • this invention provides a method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
  • the composition must be maintained at a temperature below T p , since the polymer will cease to have a thickening effect if it redissolves in the oil.
  • the composition can be free of water, or can be, for example, a water-in-oil emulsion.
  • T o melting temperature
  • T p peak melting temperature
  • J/g heat of fusion
  • Mn and Mw are used to denote number average and weight average molecular weight in daltons, respectively, measured in tetrahydrofuran using size exclusion chromatography, configured with a Wyatt laser light scattering detector.
  • Bulk viscosities given in the Example are in centipoise and were measured using a Brookfield LVT viscometer with an electrically thermostatted Thermosel heater, controlled for example to 95° C., and small sample adapter using spindles 4 and 7.
  • the procedure used in the Example to determine the effectiveness of the polymeric thickener was as follows. 5 parts of the thickener were dissolved in 95 parts of hydrogenated polyisobutylene (HPIB) with stirring at 120° C. (HPIB is a light oil).
  • HPIB hydrogenated polyisobutylene
  • the resulting solution was placed in an incubator at 20° C. for 16 hours.
  • the viscosity of cooled product in centipoise was determined using a Brookfield DV-I+ digital viscometer with CP-51 spindle using a sample adapter which was thermostatically controlled, for example, to 25° C.
  • the viscosities were measured after four minutes at a speed of 2.5 rpm, i.e. after 10 revolutions.
  • the abbreviation CxA is used to denote an n-alkyl acrylate in which the n-alkyl group contains x carbon atoms
  • the abbreviation Cx alkyl is used to denote an n-alkyl group which contains x carbon atoms
  • the abbreviation CxM is used to denote an n-alkyl methacrylate in which the n-alkyl group contains x carbon atoms.
  • Other abbreviations are given elsewhere in the specification.
  • the SCC polymers used as thickeners in the present invention are crystalline, this term being used to include polymers containing a crystalline polymeric moiety which is chemically bound to a non-crystalline moiety.
  • the thickener can be a single polymer or a mixture of polymers, and the polymer can be a homopolymer, or a copolymer of two or more comonomers, including random copolymers, graft copolymers, block copolymers and thermoplastic elastomers.
  • the SCC polymer may for example be derived from one or more acrylic, methacrylic, olefinic or vinyl monomers.
  • T p The molecular weight of an SCC polymer is relatively unimportant to its T p , but is generally an important factor in determining the T p of other polymers. It is important that the SCC polymer should melt over a relatively small temperature range. The closer T p is to room temperature, the more rapid the transition should preferably be. Thus T p -T o is less than T p 0.7 , particularly less than T p 0.6 , T o and T p being in ° C. Tp can vary widely, depending on the conditions under which the composition is to be used, as further discussed below. T p -T o is preferably less than 10° C., particularly less than 6° C.
  • SCC polymers used in the present invention are in themselves well known. Publications describing SCC polymers include U.S. Pat. Nos. 4,830,855, 5,120,349, 5,156,911, 5,387,450, 5,412,035, 5,665,822, 5,783,302, 5,752,926, 5,807,291 5,469,867, and 5,826,584; J. Poly. Sci. 60, 19 (1962), J. Poly. Sci, (Polymer Chemistry) 7, 3053 (1969), 9, 1835, 3349, 3351, 3367, 10, 1657, 3347, 18, 2197, 19, 1871, J. Poly. Sci, Poly-Physics Ed 18 2197 (1980), J. Poly. Sci, Macromol.
  • the SCC polymer used in this invention can be a homopolymer, or a copolymer of two or more comonomers, including random copolymers, graft copolymers, block copolymers and thermoplastic elastomers.
  • the number average molecular weight of the SCC polymer is generally from 10,000 to 1,500,000, preferably 12,000 to 1,000,000.
  • the SCC polymer consists essentially of units derived from at least one n-alkyl acrylate or methacrylate in which the n-alkyl group contains 12 to 50, preferably 16 to 50, carbon atoms.
  • the SCC polymer consists essentially of units derived from
  • n-alkyl acrylate or methacrylate in which the n-alkyl group contains 12 to 50, preferably 16 to 50, carbon atoms and
  • Preferred SCC polymers comprise side chains comprising linear polymethylene moieties containing 10 to 50, especially 14 to 22, carbon atoms, or linear perfluorinated or substantially perfluorinated polymethylene moieties containing 6 to 50 carbon atoms.
  • Polymers containing such side chains can be prepared by polymerizing one or more corresponding linear aliphatic acrylates or methacrylates, or equivalent monomers such as acrylamides or methacrylamides.
  • a number of such monomers are available commercially, either as individual monomers or as mixtures of identified monomers, for example C12A, C14A, C16A, C18A, C22A, a mixture of C18A, C20A and C22A, a mixture of C26A to C40A, fluorinated C8A (AE800 from American Hoechst) and a mixture of fluorinated C8A, C10A and C12A (AE12 from American Hoechst).
  • the SCC polymer When the SCC polymer is a graft or block copolymer, it can be formed either by copolymerizing a vinyl type macromonomer with other monomers, or by making an SCC polymer, and then reacting the functionalized polymer with the second block material, for example a urethane or epoxy block, polyethyleneoxide or polypropyleneoxide or polytetramethyleneoxide and the like polyether blocks, polysiloxane or poly(alkyl or alkoxy)silane blocks.
  • the second block material for example a urethane or epoxy block, polyethyleneoxide or polypropyleneoxide or polytetramethyleneoxide and the like polyether blocks, polysiloxane or poly(alkyl or alkoxy)silane blocks.
  • the SCC polymer should contain sufficient long chain groups that it will dissolve in the oil at the temperature above T p .
  • the SCC polymer When used to thicken and oil, or mixture of oils, which is free from water, it generally contains at least 50%, preferably at least 60%, particularly at least 80%, of units derived from a long chain monomer, and can contain up to 100% of such units.
  • the molecular weight of the thickening polymer should be sufficiently high that the polymer, after it has been dissolved in the oil, will precipitate from the oil when the heated mixture is cooled, for example to a temperature at least 10-20° C. below T p , thus producing an opaque mixture. This is believed to result in the formation of a polymer network in which the polymer crystallites are connected to one another by semisoluble chains.
  • the T p of the thickening polymer is preferably 10-40° C. above, particularly 10-30° C. above, especially about 20° C. above, the temperature at which the composition is to be used. It appears that the oil plasticizes the thickening polymer, so that its melting point in the composition is for example 5-10° C. lower than T p , and it is therefore important that T p is sufficiently above the temperature of use to ensure that the thickening polymer does not melt during use. Thus for compositions to be used at 20-25° C. the thickening polymer preferably has a T p of above 40° C., preferably 40-50° C.
  • T p of the thickening polymer is too far above the temperature of use, this can result in excessive precipitation of the polymer and a reduction in the thickening effect. It is preferred, therefore, that T p is not more than 30° C., preferably not more than 20° C., above the temperature of use. Depending on the expected temperature of use,T p may be from 0-150° C. generally 10-100° C. for example 20-80° C.
  • the polymeric thickener should be used in an amount sufficient to thicken the composition to the desired thickness, in general 0.1 to 12% by weight based on the oil, for example 2-10% by weight based on the composition.
  • the amount of the polymeric thickener preferably used varies with the application. It is usually unnecessary to use more than 10% of the total composition, e.g. 3-10%, and smaller amounts such as 3 to 7%, for example about 5%, are often effective.
  • the new polymeric thickeners are effective with a broad range of oils. Suitable oils are disclosed, for example, at column 3, line 37, to column 4, line 4, of U.S. Pat. No. 5,736,125, and elsewhere in the documents incorporated by reference herein.
  • the oil can be, for example, an oil selected from the group consisting of mineral oils (including for example paraffin oils, vaseline oils, and hydrogenated polyisobutylene); triglycerides (including for example vegetable oils such as sunflower seed oil, sesame seed oil, rape seed oil; sweet almond oil; calphyllum oil, palm oil, avocado oil, jojoba oil, olive oil, castor oil, and grain germ oils); purcellin oil; isopropyl myristate; butyl myristate; cetyl myristate; isopropyl palmitate; butyl palmitate; ethyl-2-hexyl palmitate; isopropyl stearate; butyl stearate; octyl
  • the new polymeric thickeners are useful for thickening a wide variety of compositions.
  • the compositions can be free of water or can be water-in-oil emulsions.
  • the invention is particularly useful for cosmetic (including hair care) compositions.
  • Such compositions can for example be in the form of varnishes, gels, sticks, oil-in-water creams, water-in-oil creams, and thickened oil products with or without water.
  • compositions include, but are not limited to, lipsticks, deodorant sticks, nail varnishes, pretanning lotions, sunscreen lotions, sun tan lotions, after-sun lotions, sun creams, protective hand creams, night renewal creams, body milks and lotions, light facial creams, protective day creams, liquid moisturizing emulsions, hairdressing preparations (including hair-treating oils, shampoos, after-shampoo compositions, products for rinsing to be applied before or after shampooing, before or after dyeing or bleaching, before or after permanent-waving or hair straightening, as a hair-setting or blow-drying composition, as a restructuring composition, or as a support for permanent-waving or for dyeing or bleaching hair), foam baths, bath oils, skin cleansers, skin foundations mascaras, eye makeups, makeup removers designed to assist in removing other cosmetic compositions.
  • the cosmetic compositions can contain conventional additives for cosmetic compositions, including but not limited to fragrances, sun screen
  • the invention is illustrated by the following Example.
  • a homopolymer of C18A was prepared using the following ingredients, C18A (100 part), mercaptoethanol (0.171 part), t-amylperoxy 2-methyl hexanoate (1.73 part, sold by Witco as Esperox 570P, 75% active in liquid), and t-butyl peroxybenzoate (0.5 parts, sold by Witco as Esperox 10).
  • C18A 100 part
  • mercaptoethanol 0.171 part
  • t-amylperoxy 2-methyl hexanoate (1.73 part, sold by Witco as Esperox 570P, 75% active in liquid
  • t-butyl peroxybenzoate 0.5 parts, sold by Witco as Esperox 10
  • the remaining monomers, chain transfer agents and starting initiator were pumped into the reaction vessel over 60-90 min.
  • the polymer mixture was allowed to continue reacting for 60 min followed by addition of the chase initiator and reaction for 60 min.
  • the mixture was put under reduced pressure for 60 min to removal volatile residuals.
  • the resulting polymer was a yellow to white solid having a weight average molecular weight of 950,000, a number average molecular weight 230,000, and a bulk viscosity of 2000 centipoise.
  • the effectiveness of the polymer as a thickener for HPIB was measured as described above.
  • the thickened oil product was opaque and had a viscosity of 5400 centipoise.

Abstract

Novel thickeners for oil-containing compositions are crystalline polymers, preferably side chain crystalline polymers, which (a) have a crystalline melting point, Tp, and an onset of melting temperature, To, such that Tp-To is less than Tp 0.7; (b) are soluble in the oil at temperatures above Tp, and (c) have been dispersed in the oil by a process which comprises (i)dissolving the polymer in the oil at a temperature above Tp, and (ii) cooling the solution from step (i) to crystallize the polymer in the oil;

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application is a divisional of Ser. No. 09/398377, filed Sep. 17, 1999.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • This invention relates to polymeric thickeners for oil-containing compositions.
  • 2. Introduction to the Invention
  • It is known to use polymers containing functional groups to thicken oil-containing compositions. Reference may be made for example to U.S. Pat. Nos. 4,720,303, 4,737,541, 4,794,139, 4,839,166, 4,939,179, 4,971,722, 5,053,057, 5,086,142, 5,112,601, 5,192,462, 5,247,121, 5,256,737, 5,270,379, 5,318,995, 5,319,055, 5,415,790, 5,422,233, 5,442,054, 5,516,544, 5,519,063, 5,530,045, 5,610,002 and 5,736,125, the disclosure of each of which is incorporated herein by reference for all purposes.
    • SUMMARY OF THE INVENTION
  • I have discovered that oil-containing compositions can be thickened with crystalline polymers which contain long chain alkyl groups in side chains but which are substantially free of functional groups.
  • In a first aspect, this invention provides a method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
  • (1) an oil, and
  • (2) dispersed in the oil, a polymer which
      • (a) has a crystalline melting point, Tp, and an onset of melting temperature, To, such that Tp-To is less than Tp 0.7,
      • (b) is soluble in the oil at temperatures above Tp,
      • (c) has been dispersed in the oil by a process which comprises
        • (i) dissolving the polymer in the oil at a temperature above Tp, and
        • (ii) cooling the solution to crystallize the polymer in the oil, and
      • (d) is a side chain crystalline (SCC) polymer which is substantially free of functional groups;
        the composition being at a temperature which is below Tp.
  • In a second aspect, this invention provides a method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
  • (1) an oil, and
  • (2) dispersed in the oil, a polymer which
      • (a) has a crystalline melting point, Tp, and an onset of melting temperature, To, such that Tp-To is less than Tp 0.7,
      • (b) is soluble in the oil at temperatures above Tp,
      • (c is in the form of a polymer network in which the polymer crystallites are connected to one another by semi-soluble chains, and
      • (d) is a side chain crystalline (SCC) polymer which is substantially free of functional groups;
        the composition being at a temperature which is below Tp.
  • The composition must be maintained at a temperature below Tp, since the polymer will cease to have a thickening effect if it redissolves in the oil. The composition can be free of water, or can be, for example, a water-in-oil emulsion.
  • One of the advantages which results from the use of such polymers as thickening agents is that they reduce or remove the need to use surface active agents in water-in-oil emulsions. This is particularly useful in personal care products, since it is conventional for such products to contain surfactants which can cause an adverse reaction when they contact human skin
    • DETAILED DESCRIPTION OF THE INVENTION
  • Definitions and Abbreviations
  • In this specification, parts and percentages are by weight. Temperatures are in ° C. The onset of melting, To, the peak melting temperature, Tp, and the heat of fusion, J/g, are determined using a differential scanning calorimeter (DSC), at a rate of temperature change of 10° C./min, typically from −10 to 150° C., and on the second heat cycle. To and Tp are measured in the conventional way well known to those skilled in the art. Thus Tp is the temperature at the peak of the DSC curve, and To is the temperature at the intersection of the baseline of the DSC peak and the onset line, the onset line being defined as the tangent to the steepest part of the DSC curve below Tp. The abbreviations Mn and Mw are used to denote number average and weight average molecular weight in daltons, respectively, measured in tetrahydrofuran using size exclusion chromatography, configured with a Wyatt laser light scattering detector. Bulk viscosities given in the Example are in centipoise and were measured using a Brookfield LVT viscometer with an electrically thermostatted Thermosel heater, controlled for example to 95° C., and small sample adapter using spindles 4 and 7. The procedure used in the Example to determine the effectiveness of the polymeric thickener was as follows. 5 parts of the thickener were dissolved in 95 parts of hydrogenated polyisobutylene (HPIB) with stirring at 120° C. (HPIB is a light oil). The resulting solution was placed in an incubator at 20° C. for 16 hours. The viscosity of cooled product in centipoise was determined using a Brookfield DV-I+ digital viscometer with CP-51 spindle using a sample adapter which was thermostatically controlled, for example, to 25° C. The viscosities were measured after four minutes at a speed of 2.5 rpm, i.e. after 10 revolutions. The abbreviation CxA is used to denote an n-alkyl acrylate in which the n-alkyl group contains x carbon atoms, the abbreviation Cx alkyl is used to denote an n-alkyl group which contains x carbon atoms, and the abbreviation CxM is used to denote an n-alkyl methacrylate in which the n-alkyl group contains x carbon atoms. Other abbreviations are given elsewhere in the specification.
  • The Polymeric Thickeners
  • The SCC polymers used as thickeners in the present invention are crystalline, this term being used to include polymers containing a crystalline polymeric moiety which is chemically bound to a non-crystalline moiety. The thickener can be a single polymer or a mixture of polymers, and the polymer can be a homopolymer, or a copolymer of two or more comonomers, including random copolymers, graft copolymers, block copolymers and thermoplastic elastomers. The SCC polymer may for example be derived from one or more acrylic, methacrylic, olefinic or vinyl monomers. The molecular weight of an SCC polymer is relatively unimportant to its Tp, but is generally an important factor in determining the Tp of other polymers. It is important that the SCC polymer should melt over a relatively small temperature range. The closer Tp is to room temperature, the more rapid the transition should preferably be. Thus Tp-To is less than Tp 0.7, particularly less than Tp 0.6, To and Tp being in ° C. Tp can vary widely, depending on the conditions under which the composition is to be used, as further discussed below. Tp-To is preferably less than 10° C., particularly less than 6° C.
  • The SCC polymers used in the present invention are in themselves well known. Publications describing SCC polymers include U.S. Pat. Nos. 4,830,855, 5,120,349, 5,156,911, 5,387,450, 5,412,035, 5,665,822, 5,783,302, 5,752,926, 5,807,291 5,469,867, and 5,826,584; J. Poly. Sci. 60, 19 (1962), J. Poly. Sci, (Polymer Chemistry) 7, 3053 (1969), 9, 1835, 3349, 3351, 3367, 10, 1657, 3347, 18, 2197, 19, 1871, J. Poly. Sci, Poly-Physics Ed 18 2197 (1980), J. Poly. Sci, Macromol. Rev, 8, 117 (1974), Macromolecules 12, 94 (1979), 13, 12, 15, 18, 2141, 19, 611, JACS 75, 3326 (1953), 76; 6280, Polymer J 17, 991 (1985); and Poly. Sci USSR 21, 241 (1979). The disclosure of each of those U.S. patents is incorporated herein by reference for all purposes.
  • The SCC polymer used in this invention can be a homopolymer, or a copolymer of two or more comonomers, including random copolymers, graft copolymers, block copolymers and thermoplastic elastomers. The number average molecular weight of the SCC polymer is generally from 10,000 to 1,500,000, preferably 12,000 to 1,000,000. In one preferred embodiment, the SCC polymer consists essentially of units derived from at least one n-alkyl acrylate or methacrylate in which the n-alkyl group contains 12 to 50, preferably 16 to 50, carbon atoms. In another preferred embodiment, the SCC polymer consists essentially of units derived from
  • (a) at least one n-alkyl acrylate or methacrylate in which the n-alkyl group contains 12 to 50, preferably 16 to 50, carbon atoms and
  • (b) at least one alkyl acrylate or methacrylate in which the alkyl group is not an n-alkyl group containing 12 to 50 carbon atoms.
  • Preferred SCC polymers comprise side chains comprising linear polymethylene moieties containing 10 to 50, especially 14 to 22, carbon atoms, or linear perfluorinated or substantially perfluorinated polymethylene moieties containing 6 to 50 carbon atoms. Polymers containing such side chains can be prepared by polymerizing one or more corresponding linear aliphatic acrylates or methacrylates, or equivalent monomers such as acrylamides or methacrylamides. A number of such monomers are available commercially, either as individual monomers or as mixtures of identified monomers, for example C12A, C14A, C16A, C18A, C22A, a mixture of C18A, C20A and C22A, a mixture of C26A to C40A, fluorinated C8A (AE800 from American Hoechst) and a mixture of fluorinated C8A, C10A and C12A (AE12 from American Hoechst).
  • When the SCC polymer is a graft or block copolymer, it can be formed either by copolymerizing a vinyl type macromonomer with other monomers, or by making an SCC polymer, and then reacting the functionalized polymer with the second block material, for example a urethane or epoxy block, polyethyleneoxide or polypropyleneoxide or polytetramethyleneoxide and the like polyether blocks, polysiloxane or poly(alkyl or alkoxy)silane blocks.
  • The SCC polymer should contain sufficient long chain groups that it will dissolve in the oil at the temperature above Tp. When the SCC polymer is used to thicken and oil, or mixture of oils, which is free from water, it generally contains at least 50%, preferably at least 60%, particularly at least 80%, of units derived from a long chain monomer, and can contain up to 100% of such units.
  • The molecular weight of the thickening polymer should be sufficiently high that the polymer, after it has been dissolved in the oil, will precipitate from the oil when the heated mixture is cooled, for example to a temperature at least 10-20° C. below Tp, thus producing an opaque mixture. This is believed to result in the formation of a polymer network in which the polymer crystallites are connected to one another by semisoluble chains.
  • The Tp of the thickening polymer is preferably 10-40° C. above, particularly 10-30° C. above, especially about 20° C. above, the temperature at which the composition is to be used. It appears that the oil plasticizes the thickening polymer, so that its melting point in the composition is for example 5-10° C. lower than Tp, and it is therefore important that Tp is sufficiently above the temperature of use to ensure that the thickening polymer does not melt during use. Thus for compositions to be used at 20-25° C. the thickening polymer preferably has a Tp of above 40° C., preferably 40-50° C. If the Tp of the thickening polymer is too far above the temperature of use, this can result in excessive precipitation of the polymer and a reduction in the thickening effect. It is preferred, therefore, that Tp is not more than 30° C., preferably not more than 20° C., above the temperature of use. Depending on the expected temperature of use,Tp may be from 0-150° C. generally 10-100° C. for example 20-80° C.
  • The polymeric thickener should be used in an amount sufficient to thicken the composition to the desired thickness, in general 0.1 to 12% by weight based on the oil, for example 2-10% by weight based on the composition. The amount of the polymeric thickener preferably used varies with the application. It is usually unnecessary to use more than 10% of the total composition, e.g. 3-10%, and smaller amounts such as 3 to 7%, for example about 5%, are often effective.
  • Oils
  • The new polymeric thickeners are effective with a broad range of oils. Suitable oils are disclosed, for example, at column 3, line 37, to column 4, line 4, of U.S. Pat. No. 5,736,125, and elsewhere in the documents incorporated by reference herein. Thus the oil can be, for example, an oil selected from the group consisting of mineral oils (including for example paraffin oils, vaseline oils, and hydrogenated polyisobutylene); triglycerides (including for example vegetable oils such as sunflower seed oil, sesame seed oil, rape seed oil; sweet almond oil; calphyllum oil, palm oil, avocado oil, jojoba oil, olive oil, castor oil, and grain germ oils); purcellin oil; isopropyl myristate; butyl myristate; cetyl myristate; isopropyl palmitate; butyl palmitate; ethyl-2-hexyl palmitate; isopropyl stearate; butyl stearate; octyl stearate; hexadecyl stearate; isocetyl stearate; decyl oleate; hexyl laurate; propylene glycol dicaprylate, diisopropyl adipate; animal oils (including, for example, perhydrosqualene); silicone oils (including for example dimethyl polysiloxanes, phenyl dimethicones and alkyldimethicones; oleyl alcohol; linoleyl alcohol; linolenyl alcohol; isostearyl alcohol; octyl dodecanol; esters derived from lanolic acid (including for example isopropyl lanolate and isocetyl lanolate); acetyl glycerides; octanoates of alcohols (including for example glycol and glycerol); decanoates of alcohols (including for example glycol and glycerol); and ricinoleates of alcohols (including for example cetyl ricinoleate).
  • Compositions
  • The new polymeric thickeners are useful for thickening a wide variety of compositions. The compositions can be free of water or can be water-in-oil emulsions. The invention is particularly useful for cosmetic (including hair care) compositions. Such compositions can for example be in the form of varnishes, gels, sticks, oil-in-water creams, water-in-oil creams, and thickened oil products with or without water. Specific examples of such compositions include, but are not limited to, lipsticks, deodorant sticks, nail varnishes, pretanning lotions, sunscreen lotions, sun tan lotions, after-sun lotions, sun creams, protective hand creams, night renewal creams, body milks and lotions, light facial creams, protective day creams, liquid moisturizing emulsions, hairdressing preparations (including hair-treating oils, shampoos, after-shampoo compositions, products for rinsing to be applied before or after shampooing, before or after dyeing or bleaching, before or after permanent-waving or hair straightening, as a hair-setting or blow-drying composition, as a restructuring composition, or as a support for permanent-waving or for dyeing or bleaching hair), foam baths, bath oils, skin cleansers, skin foundations mascaras, eye makeups, makeup removers designed to assist in removing other cosmetic compositions. The cosmetic compositions can contain conventional additives for cosmetic compositions, including but not limited to fragrances, sun screen agents, colorants, pigments, silicones, deodorants and antiseptic agents.
  • The invention is illustrated by the following Example.
    • EXAMPLE
  • A homopolymer of C18A was prepared using the following ingredients, C18A (100 part), mercaptoethanol (0.171 part), t-amylperoxy 2-methyl hexanoate (1.73 part, sold by Witco as Esperox 570P, 75% active in liquid), and t-butyl peroxybenzoate (0.5 parts, sold by Witco as Esperox 10). To a resin kettle equipped with overhead stirrer and condenser was added 20% of the monomers and chain transfer agents. The mixture in the resin kettle was heated to 110° C., and oxygen was removed from the system through nitrogen purge for about 30 min followed by addition of 20% of the starting initiator charge. After allowing sufficient time for any initial exotherm to abate, the remaining monomers, chain transfer agents and starting initiator were pumped into the reaction vessel over 60-90 min. The polymer mixture was allowed to continue reacting for 60 min followed by addition of the chase initiator and reaction for 60 min. The mixture was put under reduced pressure for 60 min to removal volatile residuals. The resulting polymer was a yellow to white solid having a weight average molecular weight of 950,000, a number average molecular weight 230,000, and a bulk viscosity of 2000 centipoise. The effectiveness of the polymer as a thickener for HPIB was measured as described above. The thickened oil product was opaque and had a viscosity of 5400 centipoise.

Claims (17)

1-4. (canceled)
5. A method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
(1) an oil, and
(2) dispersed in the oil, a polymer which
(a) has a crystalline melting point, Tp, and an onset of melting temperature, To, such that Tp-To is less than Tp 0.7,
(b) is soluble in the oil at temperatures above Tp,
(c) has been dispersed in the oil by a process which comprises
(i) dissolving the polymer in the oil at a temperature above Tp, and
(ii) cooling the solution to crystallize the polymer in the oil, and
(d) is a side chain crystalline (SCC) polymer which is substantially free of functional groups;
the composition being at a temperature which is below Tp.
6. A method according to claim 5 wherein the composition contains less than 10% by weight, based on the weight of the oil, of the SCC polymer.
7. A method according to claim 5 wherein the composition is free of water.
8. A method according to claim 5 which is carried out at a temperature Ts and wherein the SCC polymer has a crystalline melting point, Tp, which is 10 to 30° C. above Ts.
9. A method according to claim 5 wherein Tp is 20 to 80° C.
10. A method according to claim 5 wherein Tp is 40 to 50° C.
11. A method according to claim 5 wherein the SCC polymer has an onset-of-melting point To such that (Tp-To) is less than 10° C.
12. A method according to claim 5 wherein the SCC polymer comprises a homopolymer of the n-alkyl acrylate in which the n-alkyl group contains 18 carbon atoms.
13. A method according to claim 5 wherein the SCC polymer comprises a homopolymer of the n-alkyl acrylate in which the n-alkyl group contains 22 carbon atoms.
14. A method of treating human skin, the method comprising applying to the skin a thickened oil composition which comprises
(1) an oil, and
(2) dispersed in the oil, a polymer which
(a) has a crystalline melting point, Tp, which is 20 to 80° C., and an onset of melting temperature, To, such that Tp-To is less than 10° C.,
(b) is soluble in the oil at temperatures above Tp,
(c) has been dispersed in the oil by a process which comprises
(i) dissolving the polymer in the oil at a temperature above Tp, and
(ii) cooling the solution to crystallize the polymer in the oil, and
(d) is a side chain crystalline (SCC) polymer which is substantially free of functional groups;
the composition being at a temperature which is below Tp.
15. A method according to claim 14 wherein the composition contains water.
16. A method according to claim 14 wherein Tp is 40 to 50° C.
17. A method according to claim 14 wherein the SCC polymer comprises a homopolymer of the n-alkyl acrylate in which the n-alkyl group contains 18 or 22 carbon atoms.
18. A method of treating a substrate selected from the group consisting of human skin, human hair and human nails, the method comprising applying to the substrate a thickened oil composition which comprises
(1) an oil, and
(2) dispersed in the oil, a polymer which
(a) has a crystalline melting point, Tp, and an onset of melting temperature, To, such that Tp-To is less than Tp 0.7,
(b) is soluble in the oil at temperatures above Tp,
(c) is in the form of a polymer network in which the polymer crystallites are connected to one another by semi-soluble chains, and
(d) is a side chain crystalline (SCC) polymer which is substantially free of functional groups;
the composition being at a temperature which is below Tp.
19. A method according to claim 17 wherein the composition contains water.
20. A method according to claim 17 wherein the SCC polymer comprises a homopolymer of the n-alkyl acrylate in which the n-alkyl group contains 18 or 22 carbon atoms.
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US7449511B2 (en) * 1999-09-17 2008-11-11 Landec Corp. Polymeric thickeners for oil-containing compositions
US20050272618A1 (en) * 1999-09-17 2005-12-08 Bitler Steven P Polymeric thickeners for oil-containing compositions
US20070264204A1 (en) * 2006-05-11 2007-11-15 Air Products And Chemicals, Inc. Personal care compositions containing functionalized polymers
US8343132B2 (en) 2006-11-03 2013-01-01 Nordson Corporation Apparatus and methods for injecting high viscosity dermal fillers
WO2008066657A2 (en) * 2006-11-03 2008-06-05 Aesthetic Sciences Corporation Compositions, devices and methods for modifying soft tissue
WO2008066657A3 (en) * 2006-11-03 2008-07-10 Aesthetic Sciences Corp Compositions, devices and methods for modifying soft tissue
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US9012515B2 (en) 2007-08-03 2015-04-21 Rohm And Haas Company Oil formulations with thickeners
US9282736B2 (en) 2007-08-03 2016-03-15 Agrofresh Inc. Oil formulations with thickeners
US20110150794A1 (en) * 2009-12-17 2011-06-23 Air Products And Chemicals, Inc. Polymeric Compositions for Personal Care Products
US9233063B2 (en) 2009-12-17 2016-01-12 Air Products And Chemicals, Inc. Polymeric compositions for personal care products
WO2014055208A3 (en) * 2012-10-05 2014-06-26 Agrofresh Inc. Oil formulations with thickeners
CN105482034A (en) * 2014-09-19 2016-04-13 中国石油化工股份有限公司 Functional polymer with surface activity and preparation method for functional polymer and application of functional polymer

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WO2001019333A1 (en) 2001-03-22
US20010018484A1 (en) 2001-08-30
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US7449511B2 (en) 2008-11-11
EP2030608B1 (en) 2014-07-30
US20050272618A1 (en) 2005-12-08
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ATE414503T1 (en) 2008-12-15
EP1212037B1 (en) 2008-11-19

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