US4877837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy functional and silicone thermosetting powder coatings
Assignee: Vibrantz Corp
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Filing: 1988-10-07
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Granted: 1989-10-31
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Expires: 2008-10-07
Abstract
Abstract Thermosetting powder coatings are based on a blend of coreactive polymers comprising a glycidyl acrylic polymer adapted to be crosslinked by a solid cyclic silicone resin having functional hydroxyl and/or methylol groups for coreacting with the glycidyl functionality on the acrylic polymer.
Inventors
- 👤 John C. Reising
- 👤 David E. Miles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:34
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/42; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/068; C08L; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A thermosetting powder paint composition comprising on a weight basis: between 40% and 70% glycidyl functional acrylic polymer blended with 30% to 60% solid cyclic silicone resin; where said glycidyl acrylic polymer comprises copolymerized ethylenically unsaturated monomers of about 45% to 55% acrylic monomer, about 20% to 30% glycidyl functional monomer, with the balance being other ethylenically unsaturated monomer, said glycidyl acrylic polymer having a Tg above about 40° C. and a number average weight between about 2,500 and 3,000 as measured by GPC; where the cyclic silicone resin has a Tg above about 50° C. and a molecular weight above about 600 where the cyclic silicone resin includes a cyclic silicone molecule having at least two hydroxyl groups and/or methylol groups per cyclic silicone molecule, and said cyclic silicone resin crosslinks with said glycidyl acrylic polymer upon heating to provide a thermosetting powder coating.
Claim 2
Dependent Claim
145 words
A thermosetting powder paint composition comprising on a weight basis: between 40% and 70% glycidyl functional acrylic polymer blended with 30% to 60% solid cyclic silicone resin; where said glycidyl acrylic polymer comprises copolymerized ethylenically unsaturated monomers of about 45% to 55% acrylic monomer, about 20% to 30% glycidyl functional monomer, with the balance being other ethylenically unsaturated monomer, said glycidyl acrylic polymer having a Tg above about 40° C. and a number average weight between about 2,500 and 3,000 as measured by GPC; where the cyclic silicone resin has a Tg above about 50° C. and a molecular weight above about 600 where the cyclic silicone resin includes a cyclic silicone molecule having at least two hydroxyl groups and/or methylol groups per cyclic silicone molecule, and said cyclic silicone resin crosslinks with said glycidyl acrylic polymer upon heating to provide a thermosetting powder coating.
Claim 3
Dependent Claim
39 words
The powder paint composition in claim 1 where the solid cyclic silicone resin has the theoretical structure: ##STR4## where n is between 1 and 12 and the silicone resin has a number average weight between about 600 and 8000.
Claim 4
Dependent Claim
22 words
The powder paint composition in claim 2 where n is 1 and the molecular weight of the silicone resin is approximately 600.
Claim 5
Dependent Claim
21 words
The powder paint composition in claim 2 where the molecular weight of the silicone resin is between about 2,500 and 3,500.
Claim 6
Dependent Claim
26 words
The powder paint in claim 1 where the solid silicone resin contains a cyclic silicone molecule having two or more hydroxyl groups per cyclic silicone molecule.
Claim 7
Dependent Claim
26 words
The powder paint in claim 1 where the solid silicone resin contains a cyclic silicone molecule having at least two hydroxyl groups per cyclic silicone molecule.
References Cited (Backward Citations)
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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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |