US4100229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low profile additives in polyester systems
Assignee: Occidental Chemical Corp
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Filing: 1977-05-02
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Granted: 1978-07-11
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Expires: 1997-05-02
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
2026-10-27 17:02
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: 4
Claim 1
Independent Claim
21 words
A low profile additive for polyester molding compositions comprising the reaction product of a styrene-maleic anhydride copolymer and a hydroxyl-terminated polydiene.
Claim 2
Dependent Claim
21 words
A low profile additive for polyester molding compositions comprising the reaction product of a styrene-maleic anhydride copolymer and a hydroxyl-terminated polydiene.
Claim 3
Dependent Claim
34 words
The low profile additive 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
25 words
The low profile additive of claim 1 wherein the hydroxyl-terminated polydiene is a polydienediol having a molecular weight of from about 500 to about 3,000.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |