Patent US4293672A successfully refreshed from Google Patents.
US4293672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stabilizing polyester compositions
Assignee: Shell USA Inc
•
Filing: 1980-06-27
•
Granted: 1981-10-06
•
Expires: 2000-06-27
Abstract
Abstract The present invention provides an improved process for reducing the premature gelation during esterification of epoxy compounds containing tertiary, allylic or benzylic hydrogens, e.g., saturated epoxy resins, with ethylenically unsaturated monocarboxylic acids, e.g., acylic acid, which comprises prereacting the said epoxy compound with a hydroxylamine compound prior to the esterification step.
Inventors
- 👤 Roy J. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:49
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/1455; C08G59/1461; C08G59/1466; C08G59/1494; C08G59/18; C08G59/40; C08G59/62; C08G59/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A process for reducing the premature gelation of unsaturated polyester prepared by esterifying an epoxy compound containing tertiary, allylic or benzylic hydrogens with an ethylenically unsaturated monocarboxylic acid which comprises prereacting the epoxy compound with a hydroxylamine prior to the esterification step.
Claim 2
Dependent Claim
42 words
A process for reducing the premature gelation of unsaturated polyester prepared by esterifying an epoxy compound containing tertiary, allylic or benzylic hydrogens with an ethylenically unsaturated monocarboxylic acid which comprises prereacting the epoxy compound with a hydroxylamine prior to the esterification step.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the epoxy compound is a saturated epoxy resin.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the saturated epoxy resin is a glycidyl polyether of a hydrogenated phenol.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the phenol is 2,2-bis(4-hydroxyphenyl)propane.
Claim 6
Dependent Claim
16 words
The process of claim 2 wherein the epoxy resin is a hydrogenated glycidyl polyether of 2,2-bis(4-hydroxyphenyl)propane.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the epoxy compound is an epoxy resin derived from a phenolic novolac resin.
Claim 8
Dependent Claim
10 words
The process of claim 1 wherein the hydroxylamine is diethylhydroxylamine.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the ethylenically unsaturated monocarboxylic acid is acrylic or methacrylic acid.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein an esterification catalyst is employed.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the esterification catalyst is an onium salt.
Claim 12
Dependent Claim
16 words
The process of claim 1 wherein the polyester is further modified with a polycarboxylic acid anhydride.
Claim 13
Dependent Claim
21 words
A curable composition comprising the composition prepared by the process of claim 1, a compatible unsaturated comonomer, and a free-radical catalyst.
Claim 14
Dependent Claim
10 words
The composition of claim 12 wherein the comonomer is styrene.
References Cited (Backward Citations)
US2658885A
Cited
US3336241A
Cited
US3408422A
Cited
US3634542A
Cited
US3882003A
Cited
US4083890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |