US4216306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-forming polymerizable resin of benzophenone dianhydride, epoxy compound and unsaturate carboxylic acid
Assignee: UCB SA
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Filing: 1979-03-22
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Granted: 1980-08-05
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Expires: 1999-03-22
Abstract
Abstract A film-forming polymerizable resin is produced from combining acrylic acid, the diglycidyl ether of N-butyl diol and 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA). The diglycidyl ether of N-butyl diol is combined with BTDA and sufficient acrylic acid to combine with unreacted epoxide groups. The BTDA constitutes 2 to 10 percent by weight of the three ingredients. The ingredients are heated to a low acid number where the epoxy equivalent of the mixture is greater than 3,500. The resulting film-forming resin can be pigmented and can be cured in the presence of ultraviolet radiation.
Inventors
- 👤 Rudolph H. Boeckeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:59
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08G59/4292; C09; C09D; C09D163/00; C09D163/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
An auto-photoinitiated, polymerizable film-forming composition comprising the reaction product of (1) 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride; (2) an organic epoxide resin having a molecular weight less than 1000 and selected from the class consisting of monoepoxide and diepoxide resins; (3) sufficient ethylenically unsaturated carboxylic acid or anhydride to combine with unreacted expoide radicals, selected from the class consisting of acrylic acid, methacrylic acid, maleic anhydride and maleic acid; wherein the said ingredient (1) constitutes 2 to 10 percent of the combined weight of ingredients (1), (2) and (3); said film-forming composition having a viscosity less than 500,000 centipoises, an acid value less than 10 and an epoxy equivalent weight greater than 3500.
Claim 2
Dependent Claim
111 words
An auto-photoinitiated, polymerizable film-forming composition comprising the reaction product of (1) 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride; (2) an organic epoxide resin having a molecular weight less than 1000 and selected from the class consisting of monoepoxide and diepoxide resins; (3) sufficient ethylenically unsaturated carboxylic acid or anhydride to combine with unreacted expoide radicals, selected from the class consisting of acrylic acid, methacrylic acid, maleic anhydride and maleic acid; wherein the said ingredient (1) constitutes 2 to 10 percent of the combined weight of ingredients (1), (2) and (3); said film-forming composition having a viscosity less than 500,000 centipoises, an acid value less than 10 and an epoxy equivalent weight greater than 3500.
Claim 3
Dependent Claim
17 words
The film-forming composition of claim 1 wherein the said organic epoxide resin is diglycidyl ether of bisphenol-A.
Claim 4
Dependent Claim
13 words
The film-forming composition of claim 1 wherein the said carboxylic acid is acrylic.
Claim 5
Dependent Claim
12 words
A cured film consisting of the polymerized film-forming composition of claim 1.
Claim 6
Dependent Claim
11 words
A film-forming composition according to claim 1 including finely divided filler.
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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |