US4242253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low gloss powder coating compositions
Assignee: EIDP Inc
•
Filing: 1979-06-04
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Granted: 1980-12-30
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Expires: 1999-06-04
Abstract
Abstract A powder coating composition useful for coating metal substrates to provide a low gloss finish; the powder particles are a blend of (a) a polyester or a blend of polyesters, (b) an epoxy resin, (c) triglycidyl isocyanurate, (d) calcium carbonate pigment and (e) finely divided polypropylene particles; The composition is particularly useful for providing the interior of automobiles, station wagons and trucks with a low gloss finish.
Inventors
- 👤 Michael D. Yallourakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:31
CPC Classifications
C; C09; C09D; C09D167/00; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
A thermosetting powder coating composition consisting essentially of finely-divided particles at least 90 percent by weight of which have a maximum particle size not exceeding 100 microns; wherein the particles comprise a blend of about (a) 14-64% by weight of a polyester or a blend of polyesters of polyol and an aromatic polycarboxylic acid having a number of average molecular weight of about 1,000-10,000 determined by gel permeation chromatography; (b) 5-18% by weight of an epoxy resin of the formula ##STR7## where n is a positive integer and R is an aromatic radical; (c) 0.1-3% by weight of triglycidyl isocyanurate; (d) 30-55% by weight of calcium carbonate pigment and (e) 0.9-10% by weight of finely divided polypropylene particles.
Claim 2
Dependent Claim
118 words
A thermosetting powder coating composition consisting essentially of finely-divided particles at least 90 percent by weight of which have a maximum particle size not exceeding 100 microns; wherein the particles comprise a blend of about (a) 14-64% by weight of a polyester or a blend of polyesters of polyol and an aromatic polycarboxylic acid having a number of average molecular weight of about 1,000-10,000 determined by gel permeation chromatography; (b) 5-18% by weight of an epoxy resin of the formula ##STR7## where n is a positive integer and R is an aromatic radical; (c) 0.1-3% by weight of triglycidyl isocyanurate; (d) 30-55% by weight of calcium carbonate pigment and (e) 0.9-10% by weight of finely divided polypropylene particles.
Claim 3
Dependent Claim
23 words
The powder coating composition of claim 1 containing in addition to the above constituents about 0.1-3% by weight of an ultraviolet light stabilizer.
Claim 4
Dependent Claim
23 words
The powder coating composition of claim 1 containing in addition to the above constituents about 1-20% by weight of additional colorants and pigments.
Claim 5
Dependent Claim
23 words
The powder coating composition of claim 1 containing in addition to the above constituents about 0.5-4% by weight of a flow control agent.
Claim 6
Dependent Claim
15 words
The coating composition of claim 2 in which R of the epoxy resin is ##STR8##
Claim 7
Dependent Claim
138 words
The powder coating composition of claim 5 wherein the particles comprise about (a) 24-53% by weight of a blend of polyester resins comprising (1) a polyester of neopentyl glycol/terephthalic acid having a number average molecular weight of about 2,000-5,000; and (2) a polyester of neopentyl glycol/trimethylol propane/terephthalic acid having a number average molecular weight of about 2,000-5,000; wherein the molecular weights are determined by gel permeation chromatography; (b) 10-16% by weight of an epoxy resin of the formula ##STR9## wherein n is sufficiently large to provide a resin having a Gardner-Holdt viscosity measured at 25° C. at 40% solids in diethylene glycol monobutyl ether of 50-150 and an epoxide equivalent weight of 400-750; (c) 1-2% by weight of triglycidyl isocyanurate; (d) 35-50% by weight of calcium carbonate pigment and (e) 1-8% by weight of finely divided polypropylene particles.
Claim 8
Dependent Claim
23 words
The powder coating composition of claim 6 containing in addition to the above constituents about 0.1-3% by weight of an ultraviolet light stabilizer.
Claim 9
Dependent Claim
23 words
The powder coating composition of claim 6 containing in addition to the above constituents about 1-20% by weight of additional colorants and pigments.
Claim 10
Dependent Claim
24 words
The powder coating composition of claim 6 containing in addition to the above constituents about 0.5-4% by weight of acrylic polymer flow control agent.
Claim 11
Dependent Claim
17 words
A substrate coated with a 0.5-5 mil thick layer of the cured coating composition of claim 1.
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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) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |