EP0591361A4 - Method for dyeing nylon filaments - Google Patents

Method for dyeing nylon filaments

Info

Publication number
EP0591361A4
EP0591361A4 EP19920913760 EP92913760A EP0591361A4 EP 0591361 A4 EP0591361 A4 EP 0591361A4 EP 19920913760 EP19920913760 EP 19920913760 EP 92913760 A EP92913760 A EP 92913760A EP 0591361 A4 EP0591361 A4 EP 0591361A4
Authority
EP
European Patent Office
Prior art keywords
solution
nylon filament
nylon
batch
filament
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19920913760
Other languages
French (fr)
Other versions
EP0591361A1 (en
EP0591361B1 (en
Inventor
Christopher H Suhonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gillette Canada Inc
Original Assignee
Gillette Canada Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gillette Canada Inc filed Critical Gillette Canada Inc
Publication of EP0591361A1 publication Critical patent/EP0591361A1/en
Publication of EP0591361A4 publication Critical patent/EP0591361A4/en
Application granted granted Critical
Publication of EP0591361B1 publication Critical patent/EP0591361B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0002—Arrangements for enhancing monitoring or controlling the brushing process
    • A46B15/0004—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means
    • A46B15/001—Arrangements for enhancing monitoring or controlling the brushing process with a controlling means with means indicating the remaining useful life of brush
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/04—Preparing bristles
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/0004—General aspects of dyeing
    • D06P1/002—Processing by repeated dyeing, e.g. in different baths
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/02—Material containing basic nitrogen
    • D06P3/04—Material containing basic nitrogen containing amide groups
    • D06P3/24—Polyamides; Polyurethanes
    • D06P3/241—Polyamides; Polyurethanes using acid dyes

Definitions

  • the invention relates to filaments for toothbrushes.
  • Breuer et al. U.S. Pat. No. 4,802,255 describes nylon monofilaments that include at least two colored regions, one of which is provided by a dye.
  • the monofilaments are included in the bristles of toothbrushes and, as the toothbrush is used by the owner, the color intensity of the dyed region changes in response to wear, providing an indication of when the toothbrush should be replaced.
  • Breuer et al. lists six food dyes or colorants that can be used to dye the monofilaments including Indigotine (FD&C Blue No. 2) , and in col. 4 broadly describes the conditions that can be used for dyeing.
  • Breuer et al. also provides a number of specific examples of dyeing procedures, including three (examples 4-6) in which Indigotine is used as the dye.
  • the invention is a method for dyeing batches of nylon filaments for toothbrushes.
  • a batch is at least two pounds of nylon filament.
  • the method includes immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution containing between .01% and 0.1% weight to volume of Indigotine dye.
  • the solution should have a pH between 1 and 7, and should have a temperature between 50 ⁇ C. and 90 *C.
  • the nylon filament is immersed, the dye penetrates into an outer cross-sectional region but not into an inner cross-sectional region.
  • the batch of the first nylon filament is removed from the solution, and can be used for bristles in a wear-indicating toothbrush.
  • the same procedure is repeated for a batch of a second nylon filament, reusing the same solution.
  • the same solution is then used for dyeing additional batches.
  • the aqueous solution contains between 0.01% and 0.05% weight to volume of Indigotine dye; the solution has a pH of between 2.5 and 4.5; and the temperature of the solution is between 70'C. and 85"C.
  • the dyeing step is performed at atmospheric pressure and takes less than 60 minutes, and the nylon filaments have a diameter of between 0.005 inches and 0.014 inches.
  • the method can be used to produce commercial quantities of nylon filaments for use in wear- indicating toothbrushes in a cost-effective manner. For example, the procedure can be used on 10-40 lb.
  • the dyeing solution used in the method of the invention contains between 0.01% and 0.1% weight to volume Indigotine. If too much Indigotine is used, too much dye penetrates too far into the filament. If too little dye is used, too little dye may penetrate, and the solution may not be reusable because the initial batch of filament may absorb the limited quantity of dye present.
  • the temperature of the solution should be between 50 ⁇ C. and 90 ⁇ C. Too high a temperature results in water quickly evaporating off, resulting in the dye becoming more concentrated, and the dye being taken up too fast, making the degree of penetration more difficult to control. Too low a temperature results in too slow a dye uptake.
  • the dyeing process preferably is done at atmospheric pressure, to avoid the necessity of using large pressurized equipment in a plant.
  • Indigotine is an acid stable dye, and the solution should be acidic.
  • the volume of dyeing solution should be large enough so that the first batch of filament does not absorb such a high percentage of the dye in the solution that the solution cannot be reused to dye a second batch.
  • the nylon filaments should be of the diameter commonly used in toothbrushes, most preferably 0.008 or 0.009 inch.
  • the nylon filament should be immersed in solution long enough to get adequate dye penetration of the outer cross-sectional diameter of the filament to provide good wear-indicating characteristics.
  • the immersion time should be as limited as possible, and should be less than 1 hour.
  • the dyeing step is performed in a 633 gallon Whiting stainless steel tank having side dimensions of 30" x 40" x 130".
  • the dyeing solution used in the tan ' includes 633 gallons of distilled water; 7.7 liters of glacial acidic acid; and 555 g of 100% pure Indigotine. The temperature of the solution is maintained at 75*C. + 1.5*C.
  • the first tank is filled with tap water.
  • the second tank is filled with tap water mixed with 1.5 liters of Dow Corning #24 silicone emulsion.
  • the monofilament used is an eight foot long, 0.008 inch diameter Wytex 6.12 S nylon hank (bundle) weighing approximately 10 pounds.
  • the hank should be siliconed, annealed, wet, and combed prior to dyeing, according to standard procedures. The hank should not be dried prior to use.
  • the above procedure can be modified by immersing set of hanks for 30 minutes in a dyeing solution heated to 80 ⁇ C. + 1.5 ⁇ C.
  • the procedure can be used to dye 10 hanks at a time, as opposed to four hanks.

Abstract

A method for dyeing nylon filaments for use in wear-indicating toothbrushes includes immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution containing between 0.01 % and 0.19 % weight to volume of Indigotine dye, said solution having a pH between 1 and 7 and having a temperature between 50 °C and 90 °C, the dye penetrating into the filament to color an outer cross-sectional region and not penetrating into an inner cross-sectional region of the filament; removing the batch of the first nylon filament from the solution, and repeating the steps for a batch of a second nylon filament, reusing the same solution.

Description

METHOD FOR DYEING NYLON FILAMENTS The invention relates to filaments for toothbrushes.
Breuer et al., U.S. Pat. No. 4,802,255 describes nylon monofilaments that include at least two colored regions, one of which is provided by a dye. The monofilaments are included in the bristles of toothbrushes and, as the toothbrush is used by the owner, the color intensity of the dyed region changes in response to wear, providing an indication of when the toothbrush should be replaced. Breuer et al. lists six food dyes or colorants that can be used to dye the monofilaments including Indigotine (FD&C Blue No. 2) , and in col. 4 broadly describes the conditions that can be used for dyeing. Breuer et al. also provides a number of specific examples of dyeing procedures, including three (examples 4-6) in which Indigotine is used as the dye.
The specific dyeing procedures described by Breuer et al. were for laboratory samples. However, to produce a sufficient amount of dyed filaments for commercial toothbrushes, a procedure is needed that can be used for dyeing large amounts of filaments. The procedure should be cost-efficient and, of course, should produce nylon filaments that have a consistent level of dye penetration.
In general, the invention is a method for dyeing batches of nylon filaments for toothbrushes. As used herein, a batch is at least two pounds of nylon filament. The method includes immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution containing between .01% and 0.1% weight to volume of Indigotine dye. The solution should have a pH between 1 and 7, and should have a temperature between 50βC. and 90 *C. While the nylon filament is immersed, the dye penetrates into an outer cross-sectional region but not into an inner cross-sectional region. The batch of the first nylon filament is removed from the solution, and can be used for bristles in a wear-indicating toothbrush. The same procedure is repeated for a batch of a second nylon filament, reusing the same solution. Preferably, the same solution is then used for dyeing additional batches. In the preferred method, the aqueous solution contains between 0.01% and 0.05% weight to volume of Indigotine dye; the solution has a pH of between 2.5 and 4.5; and the temperature of the solution is between 70'C. and 85"C. Preferably, the dyeing step is performed at atmospheric pressure and takes less than 60 minutes, and the nylon filaments have a diameter of between 0.005 inches and 0.014 inches. The method can be used to produce commercial quantities of nylon filaments for use in wear- indicating toothbrushes in a cost-effective manner. For example, the procedure can be used on 10-40 lb. batches of nylon filaments, and even on batches weighing 100 lbs or more. Importantly, the same solution can be reused at least once, and even up to five or six times, and still produce filaments in which the Indigotine dye has penetrated an even, consistent cross-sectional area. The method is easy to carry out, safe, and provides a stable dye solution. Other advantages of the invention will be apparent from the description of the preferred embodiment thereof, and from the claims.
Dyed wear-indicating nylon monofilaments, toothbrushes including such monofilaments, and the way the toothbrushes are made are described in detail in Breuer et al.
The dyeing solution used in the method of the invention contains between 0.01% and 0.1% weight to volume Indigotine. If too much Indigotine is used, too much dye penetrates too far into the filament. If too little dye is used, too little dye may penetrate, and the solution may not be reusable because the initial batch of filament may absorb the limited quantity of dye present.
The temperature of the solution should be between 50βC. and 90βC. Too high a temperature results in water quickly evaporating off, resulting in the dye becoming more concentrated, and the dye being taken up too fast, making the degree of penetration more difficult to control. Too low a temperature results in too slow a dye uptake.
The dyeing process preferably is done at atmospheric pressure, to avoid the necessity of using large pressurized equipment in a plant.
Indigotine is an acid stable dye, and the solution should be acidic.
The volume of dyeing solution should be large enough so that the first batch of filament does not absorb such a high percentage of the dye in the solution that the solution cannot be reused to dye a second batch.
The nylon filaments, most preferably monofilaments, should be of the diameter commonly used in toothbrushes, most preferably 0.008 or 0.009 inch. The nylon filament should be immersed in solution long enough to get adequate dye penetration of the outer cross-sectional diameter of the filament to provide good wear-indicating characteristics. Preferably, the immersion time should be as limited as possible, and should be less than 1 hour.
A detailed description of the most preferred method is provided below, beginning with a description of the equipment and solutions used, followed by the procedure.
The dyeing step is performed in a 633 gallon Whiting stainless steel tank having side dimensions of 30" x 40" x 130".
The dyeing solution used in the tan 'includes 633 gallons of distilled water; 7.7 liters of glacial acidic acid; and 555 g of 100% pure Indigotine. The temperature of the solution is maintained at 75*C. + 1.5*C.
Two 633 gallon rinse tanks also are used. The first tank is filled with tap water. The second tank is filled with tap water mixed with 1.5 liters of Dow Corning #24 silicone emulsion.
The monofilament used is an eight foot long, 0.008 inch diameter Wytex 6.12 S nylon hank (bundle) weighing approximately 10 pounds. The hank should be siliconed, annealed, wet, and combed prior to dyeing, according to standard procedures. The hank should not be dried prior to use.
Dyeing Procedure 1) Completely submerse four hanks in the dye solution.
2) Set timer for 45 minutes.
3) Lift and resubmerse hanks every 1.5 minutes to permit circulation of dye between filaments. 4) After 45 minutes, remove hanks and transfer to the first rinse tank. Rinse by dipping 4 to 5 times.
5) Transfer the to the second rinse tank. Continue rinsing by dipping another 4 to
5 times. This rinse will restore the finish lost during the dyeing process.
6) Recomb hanks and continue with the normal drying and wrapping process. 7) Repeat the procedure 4 times for additional batches of hanks, using the same solutions. The dye solution and first rinse are changed after 5 hanks have been dyed; the second rinse solution is replaced daily.
Optionally, the above procedure can be modified by immersing set of hanks for 30 minutes in a dyeing solution heated to 80βC. + 1.5βC. In addition, the procedure can be used to dye 10 hanks at a time, as opposed to four hanks.
Other embodiments are within the claims.

Claims

C L A I M S 1. A method of dyeing nylon filaments for toothbrushes, comprising:
(a) immersing a batch of a first nylon filament for between 10 minutes and 80 minutes in an aqueous solution comprising between 0.01% and 0.19% weight to volume of Indigotine dye, said solution having a pH between 1 and 7 and having a temperature between 50'C. and 90*C. , said Indigotine dye penetrating into said first nylon filament to color an outer cross-sectional region of said first nylon filament, and not penetrating into an inner cross- sectional region of said first nylon filament;
(b) removing the batch of said first nylon filament from said solution to provide a first nylon filament having said outer cross-sectional region colored with said Indigotine dye and said inner cross- sectional region not colored with said Indigotine dye; and (c) repeating steps (a) and (b) for a batch of a second nylon filament, reusing the same said solution.
2. The method of claim 1, comprising the additional step of repeating steps (a) and (b) for a batch of a third nylon filament reusing the same said solution.
3. The method of claim 2, comprising the additional step of repeating steps (a) and (b) for a batch of a fourth nylon monofilament, reusing the same said solution.
4. The method of claim 1, wherein step (a) is performed at atmospheric pressure.
5. The method of claim 1, wherein said solution has a temperature of between 70*C. and 85 'C. 6. The method of claim 1, wherein said solution comprises between 0.01% and 0.05% weight to volume of Indigotine dye.
7. The method of claim 1, wherein said solution has a pH of between 2.5 and 4.5. 8. The method of claim 1, wherein said first nylon filament and said second nylon filament have an average diameter of between 0.005 inches and 0.014 inches.
9. The method of claim 1, comprising the additional steps of affixing the first dyed nylon filament to the head of a toothbrush, and at least some of the second dyed nylon filament to the head of a toothbrush.
10. The method of claim 1, wherein said first nylon filament and said second nylon filament are monofilaments.
11. The method of claim 1, wherein said first nylon filament is immersed in said aqueous solution for less than 60 minutes. 12. The method of claim 1, wherein said batch of said first nylon filament weighs at least 10 lbs.
EP92913760A 1991-06-17 1992-06-02 Method for dyeing nylon filaments Expired - Lifetime EP0591361B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US71619691A 1991-06-17 1991-06-17
US716196 1991-06-17
PCT/US1992/004589 WO1992022699A1 (en) 1991-06-17 1992-06-02 Method for dyeing nylon filaments

Publications (3)

Publication Number Publication Date
EP0591361A1 EP0591361A1 (en) 1994-04-13
EP0591361A4 true EP0591361A4 (en) 1994-05-18
EP0591361B1 EP0591361B1 (en) 1996-12-27

Family

ID=24877134

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92913760A Expired - Lifetime EP0591361B1 (en) 1991-06-17 1992-06-02 Method for dyeing nylon filaments

Country Status (12)

Country Link
EP (1) EP0591361B1 (en)
JP (1) JP2831465B2 (en)
KR (1) KR100205843B1 (en)
CN (1) CN1051118C (en)
AU (1) AU663099B2 (en)
BR (1) BR9206016A (en)
CA (1) CA2109935C (en)
DE (1) DE69216234T2 (en)
MX (1) MX9202915A (en)
SG (1) SG48428A1 (en)
WO (1) WO1992022699A1 (en)
ZA (1) ZA923986B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100425767C (en) * 2007-02-03 2008-10-15 王小芳 Staining method of tip brush silk
CN103806307A (en) * 2013-12-18 2014-05-21 慈溪市洁达纳米复合材料有限公司 Preparation method for plating colorful dye on brush filaments
CN105033836B (en) * 2015-07-06 2017-12-08 上海悦瑞电子科技有限公司 A kind of technique processing method based on the colouring of 3D printing product surface
JP6232511B1 (en) * 2017-03-03 2017-11-15 株式会社ショーワ Denim product yarn manufacturing method, and denim product yarn, denim product fabric, and denim product manufactured by the method
CN107724117A (en) * 2017-09-21 2018-02-23 晋江市明仨纺织品科技有限公司 A kind of preparation method of automatic decolouring fiber

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802255A (en) * 1987-08-10 1989-02-07 Gillette Canada Inc. Novel brush filaments

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558992A (en) * 1951-07-03 Colored nylon article and method
JP2770437B2 (en) * 1989-07-10 1998-07-02 三井化学株式会社 Rope dyeing method and rope dyeing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802255A (en) * 1987-08-10 1989-02-07 Gillette Canada Inc. Novel brush filaments

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 104, no. 18, 5 May 1986, Columbus, Ohio, US; abstract no. 150660v, BARYBINA, L. A. ET AL: "Multiple use of residual dye solutions" *
See also references of WO9222699A1 *
TEKST. PROM-ST. (MOSCOW), (12), 55, 1985 *

Also Published As

Publication number Publication date
ZA923986B (en) 1993-02-24
MX9202915A (en) 1993-01-01
JP2831465B2 (en) 1998-12-02
JPH06503860A (en) 1994-04-28
EP0591361A1 (en) 1994-04-13
WO1992022699A1 (en) 1992-12-23
DE69216234T2 (en) 1997-06-05
SG48428A1 (en) 1998-04-17
BR9206016A (en) 1994-08-02
DE69216234D1 (en) 1997-02-06
KR100205843B1 (en) 1999-07-01
CN1067936A (en) 1993-01-13
AU2186292A (en) 1993-01-12
CA2109935C (en) 2000-01-25
CN1051118C (en) 2000-04-05
EP0591361B1 (en) 1996-12-27
AU663099B2 (en) 1995-09-28

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