Patent US3819564A successfully refreshed from Google Patents.
US3819564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid curing powdered coating composition
Assignee: Napko Corp
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Filing: 1972-11-21
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Granted: 1974-06-25
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Expires: 1992-11-21
Abstract
Abstract Powdered epoxy coatings capable of rapid cure and flexibility are obtained by adding hydroxy pyridines to epoxy powder coatings hardened with aromatic anhydrides. Even faster cures can be obtained if the epoxy resin is prebranched with aromatic amines. Better cathodic protection under-cutting resistance is achieved by adding small amounts of 2,3-Epoxy-1-propanol to the prebranched epoxy resin.
Inventors
- 👤 W Gindrup
- 👤 A Siegmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:26
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08G59/14; C08G59/1433; C08G59/1438; C08G59/145; C08G59/62; C08G59/64; C08G59/68; C08G59/686; Y; Y10; Y10S; Y10S524/00; Y10S524/904
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
11 words
An accelerator selected from the group consisting of 3-hydroxypyridine and 4-hydroxypyridine,
Claim 2
Dependent Claim
11 words
The coating composition of claim 1 wherein the accelerator is 3-hydroxypyridine.
Claim 3
Dependent Claim
8 words
A powdered coating composition comprising a blend of:
Claim 4
Dependent Claim
86 words
an epoxy polymer which is the reaction product of: a. a polyglycidal ether of bisphenol A having an epoxide equivalent between 500 and 2000, b. an aromatic diamine that includes at least two groups selected from primary and secondary nitrogen atoms that are directly attached to an aromatic ring and that carry a combined total of at least three active hydrogen atoms, said aromatic diamine being present in a concentration not to exceed 0.3 mols for every 4 mols of the polyglycidal ether of bisphenol A.
Claim 5
Dependent Claim
14 words
The powdered coating composition of claim 3 wherein the accelerator consists of 3-hydroxy pyridine.
Claim 6
Dependent Claim
37 words
The coating composition of claim 3 wherein the polyglycidal ether of bisphenol A has a Durran softening point of 95*-105* C., an epoxide equivalent of 870-1000 said resin being the reaction product of bisphenol A and epichlorohydrin.
Claim 7
Dependent Claim
51 words
A powdered coating composition comprising a blend of (1) a hardener consisting of trimellitic anhydride (2) an accelerator selected from the group consisting of 3-hydroxypyridine, and 4-hydroxypyridine (3) a polyglycidal ether of bisphenol A having an epoxide equivalent of between 500 and 2000 and a melting point greater than 65* C.
Claim 8
Dependent Claim
13 words
The powdered coating composition of claim 6 wherein the accelerator is 3-hydroxy pyridine.
Claim 9
Dependent Claim
38 words
The powdered coating composition of claim 6 wherein the 1,2 epoxy resin has an epoxide equivalent between 870 and 1000 and a softening point between 95* -105* C. said resin being a copolymer of bisphenol A and epichlorohydrin.
Claim 10
Dependent Claim
144 words
A powdered coating composition comprising a blend of (1) between 1% and 20% of a hardener consisting of trimellitic anhydride, (2) between 0.1% and 20% of an accelerator selected from the group consisting of 4-hydroxy pyridine, 3-hydroxypyridine, (3) a thermoplastic polymer which is the reaction product of: a. a polyglycidal ether of bispheNol A having an epoxide equivalent between 500 and 2000 and a melting point greater than 65* C. by the Durran method, b. an aromatic diamine that includes at least 2 groups selected from primary and secondary nitrogen atoms that are directly attached to an aromatic ring and that carry a combined total of at least three active hydrogen atoms said diamine being present in a concentration of not to exceed 0.3 mols for every 4 mols of the polyglycidal ether of bisphenol A. c. between 0.01% to 3% of 2,3 epoxy-1-propanol.
Claim 11
Dependent Claim
12 words
The powdered coating composition of claim 9 wherein the accelerator is 3-hydroxypyridine.
Claim 12
Dependent Claim
13 words
The powdered coating composition of claim 9 wherein the aromatic diamine is p,p''-diaminodiphenylenemethane.
Claim 13
Dependent Claim
40 words
The coating composition of claim 9 wherein the polyglycidal ether of bisphenol A has a softening point of 95 to 105* C., an epoxide equivalent between 870 and 1000, said resin being the reaction product of bisphenol A and epichlorohydrin.
Claim 14
Dependent Claim
17 words
A powdered coating composition according to claim 9 wherein there is up to 6% of iron oxide.
Claim 15
Dependent Claim
12 words
The powdered coating of claim 1 containing up to 12% powdered silica.
References Cited (Backward Citations)
US3012979A
Cited
US3400098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |