Patent US4419495A successfully refreshed from Google Patents.
US4419495A
Expired / Lapsed
US
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Epoxy resin powder coatings having low gloss
Assignee: Dow Chemical Co
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Filing: 1982-08-23
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Granted: 1983-12-06
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Expires: 2002-08-23
Abstract
Abstract The gloss of epoxy resin powder coatings is reduced by employing as the curing agent therefor or as a portion of the curing agent therefor, a polymer of two or more polymerizable ethylenically unsaturated monomers, at least one of which contains a group which is reactive with a vicinal epoxy group.
Inventors
- 👤 Rhetta Q. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:29
CPC Classifications
C; C08; C08L; C08L63/00; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4284; C09; C09D; C09D163/00; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
In a powder coating containing a solid curable epoxy resin containing more than one vicinal epoxy group and a curing agent therefor selected from the group consisting of (1) substituted guanidines, (2) derivatives of biguanides, (3) aliphatic amines, (4) aromatic amines, (5) compounds having an average of more than one phenolic hydroxyl group per molecule and which are free of (a) sulfone groups and (b) fused rings, (6) polycarboxylic acids, (7) halogenated anhydrides, (8) non-halogenated anhydrides, and (9) mixtures thereof; the improvement which comprises employing as at least a part of said curing agent, a polymer prepared only from ethylene and acrylic acid as monomers, said polymer having a melt index of from about 30 to about 40,825 in a sufficient quantity so as to lower the 60° gloss of the coating when cured.
Claim 2
Dependent Claim
134 words
In a powder coating containing a solid curable epoxy resin containing more than one vicinal epoxy group and a curing agent therefor selected from the group consisting of (1) substituted guanidines, (2) derivatives of biguanides, (3) aliphatic amines, (4) aromatic amines, (5) compounds having an average of more than one phenolic hydroxyl group per molecule and which are free of (a) sulfone groups and (b) fused rings, (6) polycarboxylic acids, (7) halogenated anhydrides, (8) non-halogenated anhydrides, and (9) mixtures thereof; the improvement which comprises employing as at least a part of said curing agent, a polymer prepared only from ethylene and acrylic acid as monomers, said polymer having a melt index of from about 30 to about 40,825 in a sufficient quantity so as to lower the 60° gloss of the coating when cured.
Claim 3
Dependent Claim
61 words
A powder coating of claim 1 wherein (1) the epoxy resin contains an average of more than one glycidyl ether group and (2) the curing agent contains (a) a material containing a plurality of phenolic hydroxyl groups which are free of sulfone groups and fused rings and (b) said polymer has a melt index of from about 250 to about 2000.
Claim 4
Dependent Claim
58 words
A powder coating of claim 1 wherein (1) the epoxy resin contains an average of more than one glycidyl ether group and (2) the curing agent contains (a) a material containing a plurality of carboxylic acid groups and (b) a polymer prepared from ethylene and acrylic acid having a melt index of from about 250 to about 2000.
Claim 5
Dependent Claim
40 words
A powder coating of claim 3 wherein component (a) is a carboxylic acid functional polymer prepared from the esterification of compounds containing a plurality of hydroxyl groups and compounds containing a plurality of carboxylic acid groups or an anhydride thereof.
Claim 6
Dependent Claim
25 words
A powder coating of claim 4 wherein component (a) is prepared from a glycol or a polyoxyalkylene glycol and a dicarboxylic acid or anhydride thereof.
Claim 7
Dependent Claim
52 words
A powder coating of claim 1 wherein (1) the epoxy resin contains an average of more than one glycidyl ether group and (2) the curing agent contains (a) a substituted guanidine and (b) a polymer prepared from ethylene and acrylic acid having a melt index of from about 250 to about 2000.
Claim 8
Dependent Claim
21 words
A powder coating of claim 1 wherein all of the curing agent is replaced with said polymer on an equivalent basis.
Claim 9
Dependent Claim
36 words
A powder coating of claim 7 wherein (1) the epoxy resin contains an average of more than one glycidyl ether group and (2) said polymers has a melt index of from about 250 to about 2000.
Claim 10
Dependent Claim
125 words
A powder coating composition comprising (A) at least one solid epoxy resin or a mixture of epoxy resins which mixture is a solid; (B) a material containing more than one phenolic hydroxyl group and is free of sulfone groups and fused rings; (C) a sufficient quantity of a polymer prepared only from ethylene and acrylic acid as monomers, said polymer having a melt index of from about 30 to about 40,825; and (D) a catalyst or accelerator for the reaction of component (A) with components (B) or (C) or both; wherein component (A), (B) and (C) are present in quantities which provides a ratio of the equivalents of component (A) to the equivalents of component (B) plus (C) of from about 0.8 to about 1.2.
Claim 11
Dependent Claim
125 words
A powder coating composition comprising (A) at least one solid epoxy resin or a mixture of epoxy resins which mixture is a solid; (B) a material containing more than one phenolic hydroxyl group and is free of sulfone groups and fused rings; (C) a sufficient quantity of a polymer prepared only from ethylene and acrylic acid as monomers, said polymer having a melt index of from about 30 to about 40,825; and (D) a catalyst or accelerator for the reaction of component (A) with components (B) or (C) or both; wherein component (A), (B) and (C) are present in quantities which provides a ratio of the equivalents of component (A) to the equivalents of component (B) plus (C) of from about 0.8 to about 1.2.
Claim 12
Dependent Claim
72 words
A powder coating of claim 9 wherein (1) component (A) contains an average of more than one glycidyl ether group per molecule; (2) component B contains bisphenol A residues; (3) component (C) has a melt index of from about 250 to about 2,000; and (4) the ratio of the number of equivalents of component (A) to the number of equivalents of components (B) plus (C) is from about 0.9 to about 1.1.
Claim 13
Dependent Claim
138 words
A powder coating of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 wherein the solid curable epoxy resin is that represented by Formulas I or II or mixtures of two or more of such resins wherein A is independently a divalent hydrocarbyl group having from 1 to about 8 carbon atoms, --S--, --S--S--, --O--, ##STR5## each n independently has a value of zero or 1; n' has a value such that the epoxy resin is a solid at 25° C.; each A' is independently a divalent hydrocarbyl group having from 1 to about 6 carbon atoms; each X and X' is independently hydrogen, a halogen atom or a hydrocarbyl group having from 1 to about 9 carbon atoms and m has a value such that the epoxy resin is a solid at 25° C.
Claim 14
Dependent Claim
42 words
A powder coating of claim 11 wherein in the Formulas I and II, A is an isopropylidine group; each X and X' is independently hydrogen or bromine; each n has a value of 1; and A' is a --CH 2 -- group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |