US4277575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact modifier for thermoplastic compositions
Assignee: General Electric Co
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Filing: 1979-10-02
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Granted: 1981-07-07
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Expires: 1999-10-02
Abstract
Abstract An improved impact modifier is described. The modifier is an admixture of a diblock copolymer of polystyrene/saturated rubber with a triblock copolymer of polystyrene/ethylene-butylene rubber/polystyrene which significantly improves the properties of a polyphenylene oxide and polystyrene composition.
Inventors
- 👤 William R. Haaf
- 👤 Charles P. Shank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:14
CPC Classifications
C; C08; C08L; C08L25/00; C08L53/00; C08L53/02; C08L53/025; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
In a thermoplastic composition comprising polyphenylene oxide and styrene resin, the improvement which comprises an impact strength improving amount of an impact modifier consisting essentially of an admixture of a diblock copolymer of polystyrene/saturated rubber with a triblock copolymer of polystyrene/ethylene-butylene rubber/polystyrene, wherein the diblock and triblock copolymers are in a weight ratio of di- to tri- form 1:1 to 1:4 and diblock constitutes from 1 to 50% of the diblock-triblock mixture.
Claim 2
Dependent Claim
72 words
In a thermoplastic composition comprising polyphenylene oxide and styrene resin, the improvement which comprises an impact strength improving amount of an impact modifier consisting essentially of an admixture of a diblock copolymer of polystyrene/saturated rubber with a triblock copolymer of polystyrene/ethylene-butylene rubber/polystyrene, wherein the diblock and triblock copolymers are in a weight ratio of di- to tri- form 1:1 to 1:4 and diblock constitutes from 1 to 50% of the diblock-triblock mixture.
Claim 3
Dependent Claim
21 words
The composition of claim 1, wherein theadmixture comprises from a minimum effective amount up to 40% by weight of the composition.
Claim 4
Dependent Claim
22 words
The composition of claim 1, wherein the polyphenylene oxide and styrene resin are in a weight ratio of from 2:1 to 1:2.
Claim 5
Dependent Claim
18 words
The composition of claim 1, wherein the admixture comprises between 10 to 20% by weight of the composition.
Claim 6
Dependent Claim
25 words
The composition of claim 4, wherein the styrene and saturated rubber of the diblock copolymer are in a weight ratio of from 1:4 to 1:1.
Claim 7
Dependent Claim
25 words
The composition of claim 5, wherein the styrene and ethylene-butylene rubber of the triblock copolymer are in a weight ratio of from 1:5 to 1:1.
Claim 8
Dependent Claim
14 words
The composition of claim 1, wherein the styrene resin is an unmodified ("crystal") homopolystyrene.
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |