US4248977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating powders with improved adhesion
Assignee: Polymer Corp
•
Filing: 1978-11-07
•
Granted: 1981-02-03
•
Expires: 1998-11-07
Abstract
Abstract Minor amounts of a reactive epoxy resin and a polyvinyl acetal are included within thermoplastic coating powders to improve adhesion to substrates.
Inventors
- 👤 William E. Wertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:11
CPC Classifications
C; C09; C09D; C09D177/00; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
An adherent nylon coating powder comprising about 100 parts by weight of nylon melt mixed with 2 to 5 parts by weight of a reactive epoxy resin and 1 to 10 parts by weight of a polyvinyl acetal characterized in that the coating powder is free from a curing agent for the epoxy.
Claim 2
Dependent Claim
53 words
An adherent nylon coating powder comprising about 100 parts by weight of nylon melt mixed with 2 to 5 parts by weight of a reactive epoxy resin and 1 to 10 parts by weight of a polyvinyl acetal characterized in that the coating powder is free from a curing agent for the epoxy.
Claim 3
Dependent Claim
23 words
A coating powder according to claim 1 wherein the reactive epoxy has an epoxy equivalent weight of from about 200 to about 2,000.
Claim 4
Dependent Claim
18 words
A coating powder according to claim 1 wherein the polyvinyl acetal resin is polyvinyl formal or polyvinyl butyral.
Claim 5
Dependent Claim
17 words
A coating powder according to claim 1 wherein the nylon is type 11 or type 12 nylon.
Claim 6
Independent Claim
76 words
A method of obtaining adhesion between a nylon coating powder and a substrate comprising the steps of melt mixing 2 to 15 parts by weight of a reactive epoxy resin and 1 to 10 parts by weight of a polyvinyl acetal with 100 parts by weight of a nylon resin in the absence of an epoxy curing agent and fusing the melt mixed coating powder into a continuous film over a substrate by fusion coating methods.
Claim 7
Independent Claim
76 words
A method of obtaining adhesion between a nylon coating powder and a substrate comprising the steps of melt mixing 2 to 15 parts by weight of a reactive epoxy resin and 1 to 10 parts by weight of a polyvinyl acetal with 100 parts by weight of a nylon resin in the absence of an epoxy curing agent and fusing the melt mixed coating powder into a continuous film over a substrate by fusion coating methods.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |