Patent US3996307A successfully refreshed from Google Patents.
US3996307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl ester resins with improved solubility in styrene
Assignee: Dow Chemical Co
•
Filing: 1975-05-09
•
Granted: 1976-12-07
•
Expires: 1995-05-09
Abstract
Abstract The improvement is obtained by converting at least about ten percent of the aliphatic hydroxyl groups present in the vinyl ester resin to ketal groups by reacting the hydroxyl group with an isopropenyl alkyl ether.
Inventors
- 👤 Daniel J. Najvar
- 👤 Jerry M. Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/14; C08G59/1433; C08G59/1438; C08G59/1494; Y; Y10; Y10S; Y10S525/00; Y10S525/922
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A vinyl ester resin having improved solubility in styrene comprising the reaction product of about equivalent amounts of an unsaturated monocarboxylic acid and a polyepoxide having more than one 1,2-epoxide group per molecule wherein said resin is further reacted with an isopropenyl alkyl ether to convert at least about 10 percent of the aliphatic hydroxyl groups to pendant ketal groups of the formula ##STR5## where R is an alkyl or cycloalkyl group of 1 to about 6 carbon atoms.
Claim 2
Dependent Claim
79 words
A vinyl ester resin having improved solubility in styrene comprising the reaction product of about equivalent amounts of an unsaturated monocarboxylic acid and a polyepoxide having more than one 1,2-epoxide group per molecule wherein said resin is further reacted with an isopropenyl alkyl ether to convert at least about 10 percent of the aliphatic hydroxyl groups to pendant ketal groups of the formula ##STR5## where R is an alkyl or cycloalkyl group of 1 to about 6 carbon atoms.
Claim 3
Dependent Claim
21 words
The resin of claim 1 wherein at least about 30 percent of the aliphatic hydroxyls are converted to said ketal groups.
Claim 4
Dependent Claim
19 words
The resin of claim 1 wherein about 100 percent of the aliphatic hydroxyls are converted to said ketal groups.
Claim 5
Dependent Claim
13 words
The resin of claim 1 wherein said acid is acrylic or methacrylic acid.
Claim 6
Dependent Claim
24 words
The resin of claim 4 wherein said polyepoxide is bisphenol A based polyglycidyl ether having an epoxide equivalent weight of about 175 to 600.
Claim 7
Dependent Claim
22 words
The resin of claim 4 wherein said polyepoxide is a mixture of an epoxy novolac and a bisphenol A based polyglycidyl ether.
Claim 8
Dependent Claim
17 words
The resin of claim 1 wherein said ether is methyl isopropenyl ether and R, correspondingly, is methyl.
References Cited (Backward Citations)
US3342896A
Cited
US3408422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-07 | 1980-06-07 | 1980-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-07 | 1984-06-07 | 1984-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-07 | 1988-06-07 | 1988-12-07 | $7700.00 | Window Closed / Lapsed |