Patent US4038341A successfully refreshed from Google Patents.
US4038341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile additives in polyester systems
Assignee: Occidental Chemical Corp
•
Filing: 1976-03-11
•
Granted: 1977-07-26
•
Expires: 1996-03-11
Abstract
Abstract Polymerizable polyester molding compositions having good shrinkage control comprise (1) a polymerizable polyester, and (2) a low profile additive comprising the reaction product of a styrene-maleic anhydride copolymer and a polydiene having terminal hydroxyl groups.
Inventors
- 👤 Willis T. Schwartz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:38
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06; C08F; C08F299/00; C08F299/02; C08F299/04; C08G; C08G81/00; C08G81/02; C08G81/021
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A polymerizable molding composition comprising: 1. a polymerizable polyester component; comprising an unsaturated polyester and a copolymerizable unsaturated monomer and 2. an additive component comprising the reaction product of a styrene-maleic anhydride copolymer, and a hydroxyl-terminated polydiene.
Claim 2
Dependent Claim
37 words
A polymerizable molding composition comprising: 1. a polymerizable polyester component; comprising an unsaturated polyester and a copolymerizable unsaturated monomer and 2. an additive component comprising the reaction product of a styrene-maleic anhydride copolymer, and a hydroxyl-terminated polydiene.
Claim 3
Dependent Claim
33 words
The molding composition of claim 1 wherein the styrene-maleic anhydride copolymer is present in the amount of from about 25 to about 50 parts by weight per 100 parts by weight of additive.
Claim 4
Dependent Claim
24 words
The molding composition of claim 1 wherein the hydroxyl-terminated polydiene is a polydienediol having a molecular weight of from about 500 to about 3,000.
Claim 5
Dependent Claim
12 words
The molding composition of claim 1 which additionally comprises a thickening agent.
Claim 6
Dependent Claim
32 words
The molding composition of claim 4 wherein the thickening agent is an inorganic materal selected from the group consisting of magnesium oxide, magnesium hydroxide, basic magnesium carbonate, calcium hydroxide, and mixtures thereof.
Claim 7
Dependent Claim
28 words
The molding composition of claim 1 wherein the hydroxyl-terminated polydiene has at least about 60 percent of the olefinic unsaturation present in the form of 1,2-type of unsaturation.
Claim 8
Dependent Claim
14 words
The molding compound of claim 6 wherein the hydroxyl-terminated polydiene is an hydroxyl-terminated 1,2-polybutadiene.
Claim 9
Dependent Claim
20 words
The molding composition of claim 1 wherein the styrene-maleic anhydride copolymer has a styrene/maleic anhydride molar ratio of about 3:1.
Claim 10
Dependent Claim
33 words
The molding composition of claim 1 wherein the additive is present in the amount of from about 10 to about 20 parts by weight per 100 parts by weight of said molding composition.
Claim 11
Dependent Claim
28 words
A thickened non-tacky sheet molding compound comprising a polymerizable molding composition as defined in claim 1 including a filler, a thickening agent, a catalyst, and reinforcing glass fibers.
Claim 12
Dependent Claim
17 words
The molding composition of claim 1 wherein the additive component is co-reacted with the polymerizable polyester component.
References Cited (Backward Citations)
US3413379A
Cited
US3446778A
Cited
US3466348A
Cited
US3598882A
Cited
US3528939A
Cited
US3857812A
Cited
US3741943A
Cited
US3705208A
Cited
US3660339A
Cited
US3642726A
Cited
US3810863A
Cited
US3718714A
Cited
US3733370A
Cited
US3883612A
Cited
US3880950A
Cited
US3917573A
Cited
US3862998A
Cited
US3925328A
Cited
US3887515A
Cited
US3966842A
Cited
US3947422A
Cited
US3980610A
Cited
US3956421A
Cited
US3986992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |