US4383091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urethane modified polymers having hydroxyl groups
Assignee: Dow Chemical Co
•
Filing: 1982-07-01
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Granted: 1983-05-10
•
Expires: 2002-07-01
Abstract
Abstract Curable polymeric products are the reaction product of a polymer containing secondary hydroxyl groups and an aliphatic unsaturated isocyanate.
Inventors
- 👤 Bruce L. Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1494; C08F; C08F299/00; C08F299/02; C08F299/06; C08F299/065; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6705; C08G18/70; C08G18/81; C08G18/8108; Y; Y10; Y10S; Y10S525/00; Y10S525/922
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
A process for preparing vinyl ester resins having reduced viscosities, said process comprising the reaction of at least 50 percent of the secondary hydroxyls of an amine-free vinyl ester of a polyglycidyl ether with isocyanatoethylmethacrylate using a tin salt as catalyst.
Claim 2
Dependent Claim
41 words
A process for preparing vinyl ester resins having reduced viscosities, said process comprising the reaction of at least 50 percent of the secondary hydroxyls of an amine-free vinyl ester of a polyglycidyl ether with isocyanatoethylmethacrylate using a tin salt as catalyst.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said polyglycidyl ether is the diglycidyl ether of bisphenol A.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein said polyglycidyl ether is an epoxy novolac.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein said polyglycidyl ether is a blend of an epoxy novolac and a diglycidyl ether of bisphenol A.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the esterification of said polyglycidyl ether with an unsaturated acid used trivalent chromium as esterification catalyst.
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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) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |