US4038342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile additives in polyester systems
Assignee: Occidental Chemical Corp
•
Filing: 1976-03-11
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Granted: 1977-07-26
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Expires: 1996-03-11
Abstract
Abstract Polymerizable polyester compositions are provided containing a styrene-maleic anhydride copolymer reacted with a hydroxyl terminated saturated polyester. Such compositions have good thickening response and are free from tackiness in the uncured state, and upon curing have good shrinkage control and improved surface smoothness. The compositions are useful as bulk molding compounds or sheet molding compounds.
Inventors
- 👤 Willis T. Schwartz, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:26
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/024; C08G81/027; C08L; C08L67/00; C08L67/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
49 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 saturated polyester, said saturated polyester generally being terminated with at least one hydroxyl group.
Claim 2
Dependent Claim
49 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 saturated polyester, said saturated polyester generally being terminated with at least one hydroxyl group.
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 2 to about 20 parts by weight per 100 parts by weight of additive.
Claim 4
Dependent Claim
32 words
The molding composition of claim 1 wherein the saturated polyester has a molecular weight of from about 1,500 to about 25,000, and an acid number of from about 2 to about 40.
Claim 5
Dependent Claim
38 words
The molding composition of claim 2 including a copolymerizable unsaturated monomer present in an amount of from about 20 to about 60 parts by weight per 100 parts by weight of the mixture of polymerizable polyester and additive.
Claim 6
Dependent Claim
15 words
The molding composition of claim 1 wherein the molding composition also comprises a thickening agent.
Claim 7
Dependent Claim
32 words
The molding composition of claim 5 wherein the thickening agent is an inorganic material selected from the group consisting of magnesium oxide, magnesium hydroxide, basic magnesium carbonate, calcium hydroxide, and mixtures thereof.
Claim 8
Dependent Claim
37 words
The molding composition of claim 1 wherein the saturated polyester is obtained by reacting initially a diol with a dicarboxylic acid, anhydride, acid halide or diester to form a polyester having at least one terminal hydroxyl group.
Claim 9
Dependent Claim
28 words
The molding composition of claim 7 wherein the polyester initially formed is the product of reaction of a mixture of ethylene glycol and 1,4-butane diol with adipic acid.
Claim 10
Dependent Claim
17 words
The molding composition of claim 7 wherein the polyester initially formed is subsequently reacted with succinic anhydride.
Claim 11
Dependent Claim
21 words
The molding composition of claim 9 wherein the polyester initially formed and the succinic anhydride are present in approximately equimolar amounts.
Claim 12
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 1:1.
Claim 13
Dependent Claim
19 words
The molding composition of claim 1 wherein the styrene-maleic anydride copolymer has a styrene/maleic anhydride molar of about 2:1.
Claim 14
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 15
Dependent Claim
29 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 polymerization catalyst and reinforcing glass fibers.
Claim 16
Dependent Claim
26 words
A thickened non-tacky sheet molding compound comprising a polymerizable molding composition as defined in claim 1, including a filler, a polymerization catalyst and reinforcing glass fibers.
References Cited (Backward Citations)
US3413379A
Cited
US3446778A
Cited
US3466348A
Cited
US3598882A
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US3528939A
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US3843751A
Cited
US3857812A
Cited
US3741943A
Cited
US3705208A
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US3660339A
Cited
US3642726A
Cited
US3733370A
Cited
US3883612A
Cited
US3880950A
Cited
US3917573A
Cited
US3862998A
Cited
US3925328A
Cited
US3887515A
Cited
US3966842A
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US3947422A
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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 |