US4389520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Advancement catalysts for epoxy resins
Assignee: Novartis Corp
•
Filing: 1982-04-05
•
Granted: 1983-06-21
•
Expires: 2002-04-05
Abstract
Abstract Advancement catalysts selected from the group consisting of formylmethylenetriphenylphosphorane and its phosphonium halide salt precursors, e.g., formylmethyltriphenylphosphonium chloride, confer high reactivity and selectivity on epoxy resin advancement reactions. Advanced epoxy resins are useful in the perparation of coatings of high quality.
Inventors
- 👤 John A. Gannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/68; C08G59/688; C08G59/02; C08G59/04; C08G59/06; C08G59/066
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A precatalyzed epoxy resin composition which comprises (a) a liquid epoxy resin bearing an average of more than one vicinal epoxy group per molecule, and (b) a small, but effective catalytic amount of formylmethylenetriphenylphosphorane or formylmethyltriphenylphosphonium halide.
Claim 2
Dependent Claim
37 words
A precatalyzed epoxy resin composition which comprises (a) a liquid epoxy resin bearing an average of more than one vicinal epoxy group per molecule, and (b) a small, but effective catalytic amount of formylmethylenetriphenylphosphorane or formylmethyltriphenylphosphonium halide.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 wherein component (b) is formylmethylenetriphenylphosphorane or formylmethyltriphenylphosphonium chloride.
Claim 4
Dependent Claim
47 words
A composition according to claim 1 which additionally comprises (c) a bisphenol, with (b) being present in an amount sufficient to catalyze the advancement reaction between (a) and (c) when the reaction mixture is heated to a temperature of from about 50° C. to about 225° C.
Claim 5
Dependent Claim
14 words
A compositon according to claim 1 wherein (a) is the diglycidyl ether of 4,4'-isopropylidenediphenol.
Claim 6
Dependent Claim
10 words
A composition according to claim 3 wherein (c) is 4,4'-isopropylidenediphenol.
Claim 7
Dependent Claim
59 words
An improved process for advancing a liquid epoxy resin bearing at least one vicinal epoxy group with a polyphenol to form a solid, essentially linear resin at about 50° C. to about 225° C. wherein the improvement comprises carrying out the advancement reaction in the presence of a small, but effective catalytic amount of formylmethylene triphenylphosphorane or formylmethyltriphenylphosphonium halide.
Claim 8
Dependent Claim
59 words
An improved process for advancing a liquid epoxy resin bearing at least one vicinal epoxy group with a polyphenol to form a solid, essentially linear resin at about 50° C. to about 225° C. wherein the improvement comprises carrying out the advancement reaction in the presence of a small, but effective catalytic amount of formylmethylene triphenylphosphorane or formylmethyltriphenylphosphonium halide.
Claim 9
Dependent Claim
12 words
A process according to claim 6 wherein the halide is formylmethyltriphenylphosphonium chloride.
Claim 10
Dependent Claim
17 words
A process according to claim 6 wherein the epoxy resin is 2,2-bis[p-(glycidyloxy)phenyl]propane and the bisphenol is 4,4'-isopropylidenediphenol.
References Cited (Backward Citations)
US3477990A
Cited
US3547885A
Cited
US3948855A
Cited
GB1398197A
Cited
US3843605A
Cited
US4132706A
Cited
US4048141A
Cited
US4131633A
Cited
US4302574A
Cited
US4352918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |