US4925893A
Expired / Lapsed
US
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Curable coating compositions and their preparation and use
Assignee: Imperial Chemical Industries Ltd
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Filing: 1988-06-30
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Granted: 1990-05-15
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Expires: 2008-06-30
Abstract
Abstract Aqueous-based, film-forming and ambient-temperature autoxidisably crosslinkable coating composition comprising an aqueous latex of a film-forming copolymer having residual unsaturation for autoxidative cross-linking puuposes, an autoxidation catalyst, preferably a drier salt, and optionally a multi-functional crosslinking material, wherein the copolymer has a gel fraction of at least 5% by weight which has been formed by the early addition of a multi-functional comonomer in the copolymerization, with a low reactivity multi-functional comonomer being added late in the copolymerization to provide the residual unsaturation.
Inventors
- 👤 John C. Padget
- 👤 Stephen G. Yeates
- 👤 Mary R. R. Marsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:04
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/02; C09D4/00; C09D4/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
288 words
An aqueous-based, film-forming and ambient-temperature autoxidisably crosslinkable coating composition comprising an aqueous latex of at least one film-forming and ambient-temperature autoxidisably crosslinkable copolymer formed by free-radical initiated addition polymerization of a monomer system comprising at least one ethylenically unsaturated comonomer providing when polymerized the basis of the film-formability of said film-forming compolymer, hereinafter to be termed the at least one "film-forming comonomer", and an autoxidation catalyst(s) incorporated into said composition for effecting ambient temperature autoxidaton of said at least one copolymer after application of the coating composition as a coating layer, wherein said film-forming copolymer has a gel fraction of at least 5% by weight which has been formed from the monomer system used to prepare said film-forming copolymer as a result of the inclusion therein of at least one multi-functional comonomer which has been added to the copolymerization reaction in at least an early part thereof, said early part being within the first 70% conversion reached in the copolymerization, and wherein said at least one film-forming addition copolymer is autoxidisably crosslinkable, having residual carbon-carbon double bond unsaturation therein susceptible to an autoxidation reaction, as a result of said monomer system including at least one lower reactivity multi-functional comonomer which has at least two unsaturated carbon-carbon double bonds which can each take part in a free-radical initiated copolymerization reaction and at least one which reacts at a significant slower rate that does the unsaturated bond(s) of said at least one film-forming comononer and is susceptible to an autoxidative crosslinking reaction in a subsequently formed film coating, which lower reactivity multi-functional comomoner has been added to the copolymerization reaction in at least a late part thereof, said late part being after 70% conversion in the copolymerization has been reached.
Claim 2
Dependent Claim
288 words
An aqueous-based, film-forming and ambient-temperature autoxidisably crosslinkable coating composition comprising an aqueous latex of at least one film-forming and ambient-temperature autoxidisably crosslinkable copolymer formed by free-radical initiated addition polymerization of a monomer system comprising at least one ethylenically unsaturated comonomer providing when polymerized the basis of the film-formability of said film-forming compolymer, hereinafter to be termed the at least one "film-forming comonomer", and an autoxidation catalyst(s) incorporated into said composition for effecting ambient temperature autoxidaton of said at least one copolymer after application of the coating composition as a coating layer, wherein said film-forming copolymer has a gel fraction of at least 5% by weight which has been formed from the monomer system used to prepare said film-forming copolymer as a result of the inclusion therein of at least one multi-functional comonomer which has been added to the copolymerization reaction in at least an early part thereof, said early part being within the first 70% conversion reached in the copolymerization, and wherein said at least one film-forming addition copolymer is autoxidisably crosslinkable, having residual carbon-carbon double bond unsaturation therein susceptible to an autoxidation reaction, as a result of said monomer system including at least one lower reactivity multi-functional comonomer which has at least two unsaturated carbon-carbon double bonds which can each take part in a free-radical initiated copolymerization reaction and at least one which reacts at a significant slower rate that does the unsaturated bond(s) of said at least one film-forming comononer and is susceptible to an autoxidative crosslinking reaction in a subsequently formed film coating, which lower reactivity multi-functional comomoner has been added to the copolymerization reaction in at least a late part thereof, said late part being after 70% conversion in the copolymerization has been reached.
Claim 3
Dependent Claim
23 words
A composition according to claim 1 wherein said autoxidation catalyst(s) is a drier salt or a mixture of two or more drier salts.
Claim 4
Dependent Claim
28 words
A composition according to either claim 1 wherein the gel fraction of said at least one film forming copolymer of the composition is 20 to 90% by weight.
Claim 5
Dependent Claim
66 words
A composition according to claim 1 wherein said at least one lower reactivity multi-functional comonomer used in the preparation of said at least one film-forming copolymer of the composition is selected from multi-functional comonomers having one or more groups of formula CH 2 ═CRCH 2 (O) x -- where R is hydrogen or a lower (C1 to C4) alkyl group and x is 0 to 1.
Claim 6
Dependent Claim
20 words
A composition according to claim 1 wherein said late part is within 70 to 95% conversion reached in the copolymerization.
Claim 7
Dependent Claim
41 words
A composition according to claim 1 wherein in the copolymerisation to form said at least one film-forming polymer of the composition there is a gap between said early and late parts of the copolymerisation in which no multi-functional comonomer is added.
Claim 8
Dependent Claim
26 words
A composition according to claim 1 wherein said film-forming copolymer of the composition comprises 1 to 20 weight % of polymerised units derived from multi-functional comonomer.
Claim 9
Dependent Claim
40 words
A composition according to claim 1 wherein said at least one film-forming comonomer comprises at least one monoethylenically unsaturated monomer containing at least one group selected from olefinic, vinyl, and vinylidene groups, and groups containing acrylic or methacrylic double bonds.
Claim 10
Dependent Claim
83 words
A composition according to claim 8 wherein said at least one film-forming copolymer of the composition is a copolymer comprising (in addition to units of multi-functional comonomer) units of one or more of the following: vinyl chloride, vinylidene chloride, vinyl esters of alkanoic acids having from 1 to 18 carbon atoms in the alkyl group, alkyl acrylates and methacrylates having from 1 to 18 carbon atoms in the alkyl group, vinyl ethers, acrylamide and substituted acrylamides, acrylonitrile, and methacrylonitrile, and monoethylenically unsaturated hydrocarbons.
Claim 11
Dependent Claim
25 words
A composition according to claim 1 wherein said at least one film-forming copolymer of the composition comprises units of at least one α,β-unsaturated carboxylic acid.
Claim 12
Dependent Claim
61 words
A composition according to claim 1 wherein said at least one film-forming copolymer of the composition is a copolymer comprising units of vinyl chloride, vinylidene chloride, one or more alkyl acrylates or alkyl methacrylates having from 1 to 12 carbon atoms in the alkyl group, at least one lower multi-functional comonomer reactivity and optionally at least one aliphatic α,β-unsaturated carboxylic acid.
Claim 13
Dependent Claim
34 words
A composition according to claim 1 which composition additionally includes at least one multi-functional crosslinking material which has at least one of its at least two carbon-carbon double bonds susceptible to an autoxidation reaction.
Claim 14
Dependent Claim
34 words
A composition according to claim 1 which composition additionally includes at least one multi-functional crosslinking material which does not have any of its at least two carbon-carbon double bonds susceptible to an autoxidation reaction.
References Cited (Backward Citations)
US4296013A
Cited
US4346027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |