Patent US3569756A successfully refreshed from Google Patents.
US3689596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact resistant styrene-maleic anhydride/hydroxylated diene block copolymer compositions
Assignee: Dow Chemical Co
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Filing: 1971-04-19
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Granted: 1972-09-05
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Expires: 1991-04-19
Abstract
Abstract A plastic composition with a good balance of physical properties especially having improved impact and high heat distortion is prepared by intimately mixing from about 15 to 50 weight percent of a partially hydroxylated diene block copolymer with about 85 to 50 weight percent of an anhydride containing thermoplastic such as a styrene-maleic anhydride copolymer.
Inventors
- 👤 Munisamappa Narayana
- 👤 Jerry E Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:00
CPC Classifications
C; C08; C08L; C08L35/00; C08L35/06; Y; Y10; Y10S; Y10S525/00; Y10S525/911; Y10S525/913
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The thermoplastic composition of claim 1 wherein said anhydride is maleic anhydride.
Claim 2
Dependent Claim
15 words
The thermoplastic composition of claim 1 wherein the thermoplastic is a copolymer of styrene-maleic anhydride.
Claim 3
Dependent Claim
20 words
The thermoplastic composition of claim 1 wherein said diene block copolymer has an inherent viscosity of about 1.3 to 3.7.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |