Patent US2657405A successfully refreshed from Google Patents.
Patent EP0029595A1 successfully refreshed from Google Patents.
EP0029595A1
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EP
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An improved high solids coating composition of a low molecular weight glycidyl acrylic polymer and an alkylated melamine cross-linking agent, and a substrate coated therewith
Assignee: EIDP Inc
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Filing: 1980-11-21
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Granted: —
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Expires: 2000-11-21
Abstract
Abstract The improved high solids coating composition contains at least 50% by weight of a binder of film-forming constituents in which the constituents are of (A) an acrylic polymer that has a number average molecular weight of about 500-10,000, and is of glycidyl methacrylate, an alkyl methacrylate, and optionally an alkyl acrylate, a hydroxyalkyl methacrylate, a hydroxyalkyl acrylate or styrene; (B) an alkylated melamine formaldehyde cross-linking agent; the improvement used with this composition is the addition of select ultraviolet light stabilizers and optionally, antioxidants. The composition is particularly useful for clear coat/color coat exterior finishes for automobiles, trucks and airplanes.
Inventors
- 👤 David Chi-Kung Chang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:13
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/068; C09D133/14; C08; C08L; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
An improved high solids coating composition comprising at least 50% by weight of a binder of film-forming constituents and up to 50% by weight of a liquid carrier; in which the film-forming constituents consist essentially of (A) about 50-95% by weight of a glycidyl polymer having a number average molecular weight determined by gel permeation chromatography of about 500-10,000, and consisting essentially of glycidyl methacrylate, methyl methycry- late, an alkyl methacrylate or an alkyl acrylate each having 2-18 carbon atoms in the alkyl group; (B) about 5-50% by weight of an alkylated melamine formaldehyde cross-linking agent, the improvements uses therewith comprises: about 0.1-20% by weight, based on the weight of the binder, of an ultraviolet light stabilizer.
Claim 2
Dependent Claim
117 words
An improved high solids coating composition comprising at least 50% by weight of a binder of film-forming constituents and up to 50% by weight of a liquid carrier; in which the film-forming constituents consist essentially of (A) about 50-95% by weight of a glycidyl polymer having a number average molecular weight determined by gel permeation chromatography of about 500-10,000, and consisting essentially of glycidyl methacrylate, methyl methycry- late, an alkyl methacrylate or an alkyl acrylate each having 2-18 carbon atoms in the alkyl group; (B) about 5-50% by weight of an alkylated melamine formaldehyde cross-linking agent, the improvements uses therewith comprises: about 0.1-20% by weight, based on the weight of the binder, of an ultraviolet light stabilizer.
Claim 3
Dependent Claim
32 words
The coating composition of claim 1 in which the acrylic polymer has a glass transition temperature of about -20°C to +20°C and contains about 2-10% by weight of a chain transfer agent.
Claim 4
Dependent Claim
45 words
The coating composition of claim 2 in which the acrylic polymer consists essentially of 15-50% by weight of glycidyl methacrylate, 10-60% by weight of methyl methacrylate, 15-40% by weight of an alkyl methacrylate or an alkyl acrylate having 2-12 carbon atoms in the alkyl group.
Claim 5
Dependent Claim
37 words
The coating composition of claim 2 in which the acrylic polymer consists essentially of 20-30% by weight of styrene, 10-30% by weight of methyl methacrylate, 15-30% by weight of lauryl methacrylate, 25-45% by weight of glycidyl methacrylate.
Claim 6
Dependent Claim
33 words
The coating composition of any one of claims 1 to 4 containing pigment in addition to the binder in the amount of about 0.1-30% by weight, based on the weight of the binder.
Claim 7
Dependent Claim
40 words
A composition according to any one of claims 1 to 5 which contains up to about 10% by weight, based on the weight of the film-forming constituents, of iron pyrophosphate and up to about 15% by weight of finely-divided silica.
Claim 8
Dependent Claim
63 words
The coating composition of any one of claims 1 to 6 containing 1-20% by weight, based on the weight of the binder, of an ultraviolet light stabilizer and about 0.1-5% by weight, based on the weight of the binder, of an antioxidant, preferably an alkylene (dialkylhydroxyl-aryl) ester alkane; wherein the weight ratio of ultraviolet light stabilizer to antioxidant is 1:1 to about 50:1.
Claim 9
Dependent Claim
25 words
The coating composition of any one of claims 1 to 7 in which the ultraviolet light stabilizer is a benzophenone or a substitued benzotrialzole stabilizer.
Claim 10
Dependent Claim
33 words
The coating composition of any one of claims 1 to 8 in which the cross-linking agent is an alkylated melamine formaldehyde resin having 1-4 carbon atoms in the alkyl group, preferably hexamethoxymethyl melamine.
Claim 11
Dependent Claim
30 words
The coating composition of claims 3 or 4 containing in addition to the film-forming constituents a carboxyl-terminated reaction product of ester diol and a polycarboxylic acid or polycarboxylic acid anhydride.
Claim 12
Dependent Claim
35 words
The coating composition of claim 4 in which the acrylic polymer consists essentially of styrene , methyl methacrylate, lauryl methacrylate, glycidyl methacrylate in a 25/20/37 weight ratio and the cross-linking agent is hexamethoxy methyl melamine.
Claim 13
Dependent Claim
28 words
The coating composition of claim 7 in which the ultraviolet light stabilizer is a 2(2'-hydroxyphenyl)benzotriazole or 4-(2,2,6,6,-tetramethyl piperidyl) sebacate or mixtures thereof and the antioxidant is tetrakismethylene-3-(3',5'-dibutyl-4'-hydroxyphenyl)propionate methane.
Claim 14
Dependent Claim
75 words
A substrate having a finish of a clear coat top layer in firm adherence to a color coat layer in adherence with the substrate; wherein the clear coat consists essentially of a transparent film-forming binder of the glycidyl acrylic polymer and the cross-linking agent of claim 1, the color coat consists essentially of a coalesced layer of the coating composition of claim 1 containing pigments in a pigment-to-binder weight ratio of about 1/100 to 150/100.
Claim 15
Dependent Claim
42 words
The substrate of claim 13 in which the color coat is about 0.4-1.5 mils thick and the clear coat is about 0.5-5.0 mils thick, and in which preferably both the color coat and the clear coat each contain an ultraviolet light stabilizer.
Claim 16
Dependent Claim
59 words
The substrate of claim 14 in which the clear coat is a dried coalesced layer of the composition of claim 7 and the color coat is a dried coalesced layer of the composition of claim 7 containing pigment in addition to the binder of about 0.1-30% by weight, based on the weight of the binder of the color coat.
References Cited (Backward Citations)
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