US4067926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating materials
Assignee: British Industrial Plastics Ltd
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Filing: 1975-01-14
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Granted: 1978-01-10
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Expires: 1995-01-14
Abstract
Abstract A powder coating material comprises a copolymer of an ethylenically unsaturated ester and from 11% by weight to 15% by weight (based on the weight of the copolymer) of an α, β-unsaturated carboxylic acid, cross-linked with a di- or polyepoxide resin.
Inventors
- 👤 Philip Michael Cadman
- 👤 Brian York Downing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:31
CPC Classifications
C; C08; C08L; C08L63/00; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; C09D163/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
A powder coating material, consisting essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an α,β-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, characterized in that the α,β-unsaturated carboxylic acid is present in an amount of from 11% by weight to 15% by weight of the terpolymer.
Claim 2
Dependent Claim
53 words
A powder coating material, consisting essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an α,β-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, characterized in that the α,β-unsaturated carboxylic acid is present in an amount of from 11% by weight to 15% by weight of the terpolymer.
Claim 3
Dependent Claim
34 words
A powder coating material according to claim 1, characterised in that the cross-linking agent comprises a cycloaliphatic diepoxide resin and the ratio of epoxide groups to carboxylic acid groups is from 0.5:1 to 1:1.
Claim 4
Dependent Claim
33 words
A powder coating material according to claim 1, characterised in that the cross-linking agent comprises an epichlorohydrin-diphenylolpropane resin and the ratio of epoxide groups to carboxylic acid groups is from 0.15:1 to 0.35:1.
Claim 5
Dependent Claim
32 words
A powder coating material according to claim 1, characterised in that the cross-linking agent comprises triglycidyl isocyanurate and the ratio of epoxide groups to carboxylic acid groups is from 0.35:1 to 0.90:1.
Claim 6
Dependent Claim
97 words
In a powder coating composition which consists essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an α,β-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, the improvement consisting essentially of providing in said composition from 11% to 15% by weight, based on the copolymer, of said α,β-unsaturated carboxylic acid, whereby the aggregate physical and mechanical properties of coatings produced therefrom are improved over the aggregate of said properties for a coating produced from a similar composition containing not more than 10% by weight, based on the copolymer, of said unsaturated acid.
Claim 7
Dependent Claim
97 words
In a powder coating composition which consists essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an α,β-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, the improvement consisting essentially of providing in said composition from 11% to 15% by weight, based on the copolymer, of said α,β-unsaturated carboxylic acid, whereby the aggregate physical and mechanical properties of coatings produced therefrom are improved over the aggregate of said properties for a coating produced from a similar composition containing not more than 10% by weight, based on the copolymer, of said unsaturated acid.
Claim 8
Dependent Claim
19 words
In a powder coating composition as claimed in claim 5, the further improvement of omitting therefrom a gel catalyst.
Claim 9
Dependent Claim
32 words
In a method of producing a coating on a substrate by a powder coating technique, the improvement which comprises applying to the substrate a powder coating material as claimed in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |