WO1995035349A1 - Composition - Google Patents
Composition Download PDFInfo
- Publication number
- WO1995035349A1 WO1995035349A1 PCT/SE1995/000773 SE9500773W WO9535349A1 WO 1995035349 A1 WO1995035349 A1 WO 1995035349A1 SE 9500773 W SE9500773 W SE 9500773W WO 9535349 A1 WO9535349 A1 WO 9535349A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition according
- coating composition
- groups
- carbonyl
- polyesters
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
Definitions
- the present invention relates to coating compositions with no or extremely low-formaldehyde emission for use in lacquers and paints, especially in wood finishing without giving rise to additional yellowing from the crosslin ing agent.
- Acid curing systems are defined as crosslinkable laquers which contain as reactive crosslinker an amino resin melamine/- urea/guanidine-formaldehyde type which gives rise to formaldehyde emission. All acid curing systems as defined above give rise to formaldehyde emission when drying at a level of 0.1-0.2 mg/100 g wet laquer according to the NIF-method (cf. Article No. 3-82 (November 1982) from Scandinavian Paint and Printing Ink Research Institute), a value which is interesting from the point of view of safety regulations.
- EP 0 201 693 polyhydroxylated resin based on polyvinylalcohol and polyvinylacetate which is sprayed with a second component containing a diacetal which is described in US 4,655,841 a polyhydroxypolymer, a hexaalkoxy methylolmelamine and a polyacetal and acid catalyst, which is described in US patent 5,155,170.
- polyurethane based system compri ⁇ sing a crosslinker such as high molecular weight polyisocyanate in combination with hydroxy functional polyesters or polyacryla- tes as an alternative in formaldehyde free system.
- a crosslinker such as high molecular weight polyisocyanate
- hydroxy functional polyesters or polyacryla- tes as an alternative in formaldehyde free system.
- free isocyanate groups give rise to environmentally dangerous products by handling and exposure and as well as when destroying residual products.
- Attempts to reduce the formaldehyde emission from lacquers comprise inter alia the use of additives reacting with formalde ⁇ hyde such as ethyleneurea, peroxides, organic sulphites, alkyl- acetone modified resins, cf..eg. EP 0043036.., which reduce the emission to about 0.1 mg m .
- formalde ⁇ hyde such as ethyleneurea, peroxides, organic sulphites, alkyl- acetone modified resins, cf..eg. EP 0043036.., which reduce the emission to about 0.1 mg m .
- the present invention relates to coating compositions with low formaldehyde emission below the normal background emission and at most is about 0.005 mg m .
- the coating compositions according to the invention are based on essentially formaldehyde free crosslinking system comprising, in one or more organic solvents whereof at least one is a monofunctional alcohol, polymers containing active hydrogen, compounds functionalized from carbonyl containing compounds and a catalyst selected from strong acids and salts thereof or alkalis.
- the present invention more specifically relates to a storage stable, room-temperature curable coating composition for wood finishing based on a crosslinking system which does not give rise to formaldehyde emission and which comprises, in one or more organic solvents whereof at least one is a monofunctional alcohol, polymers containing active hydrogen; compounds func ⁇ tionalized from carbonyl containing compounds, which compounds are hydrates and/or acetals of mono-, di- and/or polyaldehydes containing at least two carbon atoms as such or/and modified with hydrogen functional binders selected from polyesters, cellulose derivatives, acrylics, or modified polyesters; and a catalyst selected from strong acids and salts thereof or alkalis.
- a crosslinking system which does not give rise to formaldehyde emission and which comprises, in one or more organic solvents whereof at least one is a monofunctional alcohol, polymers containing active hydrogen; compounds func ⁇ tionalized from carbonyl containing compounds, which compounds are hydrates and/or acetals
- the crosslinking system according to the present invention comprises the reaction between hydrogen active groups and carbonyl functionalized groups in a activ equiv./equiv. in the range of 0.3-2, preferably 1-1.2.
- the polymers containing active hydrogen comprise:
- the essential formaldehyde free crosslinking system according to the present invention contains compounds functionalized from carbonyl containing compounds in the form of semiacetal, acetal, semiketal, ketal and/or hydrated groups.
- the expression compound functionalized from a carbonyl containing compound refers to all these types of carbonyl derivatives.
- catalysts such as strong acids are used, e.g. pTSA, H2S0 4 , H PO4 and derivatives, HC1 or strong basic solutions as LiOH, NaOH, KOH in protic solvents such as methanol, ethanol, propylalcohol, i-propylalcohol, butanol, i-butanol, methoxypropanol, glycols, or similar and mixtures thereof.
- the hydroxy functional polymers with active hydrogen which can be used in the crosslinking system according to the present invention includes such polymers as:
- - cellulose ethers methyl or ethyl, with at least one hydroxyl group per unit anhydro glucose.
- Such polymers as described above having hydroxy functionality and/or amino/amido functionality and/or acetylacetone or enolisable aldehyde groups are used to crosslink with carbonyl funtional compounds containing at least one carbonyl group presented as hydrates or acetals or ketals. Examples of typical reactions involved in this crosslinking process used in the present invention are illustrated in reaction schemes 1)-4) wherein the general formula of the carbonyl derivative is:
- R ⁇ H, -C n H 2n+1 , -(CH 2 ) n -CH 2 OR 3 ,
- R 2 H, -C n H 2n+1 , -(CH 2 ) n -0-R 4
- R are alkyl chains with 1-6 C-atoms, preferably 2-4 C-atoms.
- R, R ⁇ , R2, n are defined as above.
- the compound functionalized from a carbonyl containing compound shall contain at least 2 carbon atoms and at least one group functionalized from carbonyl selected so that the boiling point of the carbonyl derivative is at least 21°C.
- the highest derivative in the series is a polyacetal which has a maximum carbonyl functionality of 450 mg KOH/g and a molecular weight of 20 000.
- One of the components of the organic solvents to be used must always be a monofunctional alcohol.
- Other components of the solvent mixture if several organic solvents are used can be selected from esters, alcohols, aromatic hydrocarbons and glycol ethers.
- the molar ratio between the monofunctional alcohol and the acetal and/or ketal functionality skall be in the range of from 2:1 to 10:1.
- the catalysts used in the composition according to the present invention are strong acids or alkalis in accordance with the desired network polymer and/or the starting point formulation, i.e. the functional groups involved in the curing process.
- H active from binder
- the coating composition according to the present invention also combines a condensation reaction between a polyacetal reactive compound and a hydrogen active oligomer selected from polymers modified with unsaturated fatty acids of vegetable, animal and synthetic origin capable to crosslink through an airdrying mechanism catalyzed by metal ions such as Co, Fe, Mn, Zr, Pb at a level of 0.01-0.1% based on non ⁇ volatile content of composition.
- a polyacetal reactive compound selected from polymers modified with unsaturated fatty acids of vegetable, animal and synthetic origin capable to crosslink through an airdrying mechanism catalyzed by metal ions such as Co, Fe, Mn, Zr, Pb at a level of 0.01-0.1% based on non ⁇ volatile content of composition.
- the composition comprises a crosslinking system based on solvent borne cellulose derivates, acetal functionalized where the active species are stabilized by means of a strong acid which is also a catalyst in further reaction with H-functional polymers whereby improved resistance against discolouration is obtained.
- composition of the present invention may be modified by the addition of additives and ingredients which normally are added to paint and lacquer compositions such as conventional amount of fillers, pigments, reinforcing agents, mar, slip and flow control agents, flattening agents, levelling agents etc, selected so as to be compatible with the system.
- additives and ingredients which normally are added to paint and lacquer compositions such as conventional amount of fillers, pigments, reinforcing agents, mar, slip and flow control agents, flattening agents, levelling agents etc, selected so as to be compatible with the system.
- the compositions of the present invention can be applied to wood, plastic and metal substrates as such or in combination with other sealers or top coats.
- composition according to the present invention has an emitted formaldehyde level within 24 hours of less than 0.01 mg m , experimentally detected less than 0.005 mg m .
- a cured sealer made by the composition according to the present invention provides a coating surface which is not dissolved by any usual top layer used in the wood finishing industry.
- the carbonyl derivatives used in the composition according to the present invention are liquids at room temperature and have a boiling temperature higher than 60°C.
- the composition according to the present invention provides a high built finishing on wood surfaces and has a nonvolatile content of about 30-50% at room temperature and at application viscosity.
- the finished coating according to the present invention exhibits very good properties that impart recoatability, sandability, stain and chemical resistance without any aldehyde emission caused by the coating, all of which properties mean that the coating composition according to the present invention is a superior alternative to both classic acid curing systems and polyurethane systems not least for environmental reasons.
- Formaldehyde More than Less than Less than emission 24 hours 0.3 mg m ⁇ 3 0.005 mg m ⁇ 3 0.005 mg m "3 after application
- a carbonyl functional derivate in acetal form is produced by using a reactor equipped with a reflux condenser, agitator and heating mantel by blending: la lb lc Id
- the mixture is maintained at 54-56°C in order to obtain a clear yellow pale solution.
- a polycarbonyl functional derivate in acetal form is produced in a reactor as above by using a formulation as such:
- the mixture is maintained at 52-54°C until the solution is waterclear.
- the mixture is heated at 80-110°C to distill the water in order to obtain a polyfunctional*acetal.
- lacquers were produced according to the instant invention using conventional blending and agitation methods. All these systems involve chemical reactions such as these previously described catalysed by acids or in certain cases by alkalis.
- the coating compositions were applied on wood or glass panels by means of an applicator in a thickness of between 80 and 150 ⁇ m wet and dried 24 h at room temperature.
- the lacquer has
- Nonvolatile content ⁇ 50%
- the lacquer has a pot life at 23.3°C more than 72 h aldehyde emission after 24 h less than 0.003 mg m -3
- the lacquer has a pot life at 23.3°C more than 72 h aldehyde emission after 24 h less than 0.005 mg m -3
- the lacquer has a pot life at 23.3°C more than 48 h aldehyde emission after 24 h less than 0.01 mg m ⁇
- the lacquer obtained is hardened at room temperature with a catalyst consisting of
- Aldehyde emission after 24 h is less than 0.005 mg m -3
- the lacquer has a potlife at 23,3°C more than 48 h
- Dendrimer (dendritic macromolecule)
- Alkyd resin (70% in Butyl Acetate 60.3 (OH - 170 mg KOH/g oil length ⁇ 50% oil type ⁇ tall oil)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU28131/95A AU2813195A (en) | 1994-06-22 | 1995-06-22 | Composition |
EP95923650A EP0766718A1 (en) | 1994-06-22 | 1995-06-22 | Composition |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9402211A SE9402211D0 (en) | 1994-06-22 | 1994-06-22 | Composition |
SE9402211-8 | 1994-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995035349A1 true WO1995035349A1 (en) | 1995-12-28 |
Family
ID=20394490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/000773 WO1995035349A1 (en) | 1994-06-22 | 1995-06-22 | Composition |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0766718A1 (en) |
AU (1) | AU2813195A (en) |
SE (1) | SE9402211D0 (en) |
WO (1) | WO1995035349A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19730936A1 (en) * | 1997-07-18 | 1999-01-21 | Rlt Aps Ren Lak Teknologi | Coating medium used as wood varnish |
EP0911361A1 (en) * | 1997-10-27 | 1999-04-28 | National Starch and Chemical Investment Holding Corporation | Thermosetting polysaccharides |
FR3029933A1 (en) * | 2014-12-12 | 2016-06-17 | Ecoat | AQUEOUS FILMOGENEOUS COMPOSITION OF AQUEOUS DISPERSION COPOLYMER (ESTER-CETAL) WITH RETICULATING AGENT AND A CROSS-LINKING PROCESS |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3200099A (en) * | 1963-06-10 | 1965-08-10 | Rohm & Haas | Thermosetting compositions comprising methylene diethers and polymers of hydroxy-containing esters |
EP0140357A2 (en) * | 1983-10-29 | 1985-05-08 | Herberts Gesellschaft mit beschränkter Haftung | Heat hardenable coating composition, precondensates contained therein, and their use |
US4655841A (en) * | 1984-01-04 | 1987-04-07 | Ulano Corporation | Hardener composition |
EP0255608A2 (en) * | 1986-07-05 | 1988-02-10 | Herberts Gesellschaft mit beschränkter Haftung | Thermosetting coating composition and its use |
US5155170A (en) * | 1990-11-09 | 1992-10-13 | Akzo Coatings, Inc. | Process for preparing low formaldehyde polyacetal containing coating |
-
1994
- 1994-06-22 SE SE9402211A patent/SE9402211D0/en unknown
-
1995
- 1995-06-22 AU AU28131/95A patent/AU2813195A/en not_active Abandoned
- 1995-06-22 EP EP95923650A patent/EP0766718A1/en not_active Withdrawn
- 1995-06-22 WO PCT/SE1995/000773 patent/WO1995035349A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3200099A (en) * | 1963-06-10 | 1965-08-10 | Rohm & Haas | Thermosetting compositions comprising methylene diethers and polymers of hydroxy-containing esters |
EP0140357A2 (en) * | 1983-10-29 | 1985-05-08 | Herberts Gesellschaft mit beschränkter Haftung | Heat hardenable coating composition, precondensates contained therein, and their use |
US4655841A (en) * | 1984-01-04 | 1987-04-07 | Ulano Corporation | Hardener composition |
EP0255608A2 (en) * | 1986-07-05 | 1988-02-10 | Herberts Gesellschaft mit beschränkter Haftung | Thermosetting coating composition and its use |
US5155170A (en) * | 1990-11-09 | 1992-10-13 | Akzo Coatings, Inc. | Process for preparing low formaldehyde polyacetal containing coating |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19730936A1 (en) * | 1997-07-18 | 1999-01-21 | Rlt Aps Ren Lak Teknologi | Coating medium used as wood varnish |
DE19730936C2 (en) * | 1997-07-18 | 2003-06-26 | Rlt Aps Ren Lak Teknologi Skje | Process for the circular guidance of process components in the application of coating agents and coating agents for this purpose |
EP0911361A1 (en) * | 1997-10-27 | 1999-04-28 | National Starch and Chemical Investment Holding Corporation | Thermosetting polysaccharides |
FR3029933A1 (en) * | 2014-12-12 | 2016-06-17 | Ecoat | AQUEOUS FILMOGENEOUS COMPOSITION OF AQUEOUS DISPERSION COPOLYMER (ESTER-CETAL) WITH RETICULATING AGENT AND A CROSS-LINKING PROCESS |
Also Published As
Publication number | Publication date |
---|---|
AU2813195A (en) | 1996-01-15 |
EP0766718A1 (en) | 1997-04-09 |
SE9402211D0 (en) | 1994-06-22 |
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