Patent US4096205A successfully refreshed from Google Patents.
US4096205A
Expired / Lapsed
US
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Method to produce improved rubber-modified styrene polymer
Assignee: BP Corp North America Inc
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Filing: 1975-08-29
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Granted: 1978-06-20
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Expires: 1995-08-29
Abstract
Abstract An improved process for producing an ultra high impact rubber-modified styrene polymer comprises mass polymerizing, substantially without inert solvent, styrene monomer and a styrene-butadiene copolymer rubber containing from 8 to 12 weight percent styrene having a solution viscosity ranging from 20 to 60 cps.
Inventors
- 👤 Robert A. Reith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:52
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
In a process for producing rubber-modified styrene polymer, wherein (a) a polymerization feedstock is formed comprising an effective amount up to 30 weight percent of a rubber in styrene monomer in the substantial absence of inert solvent, (b) such feedstock is polymerized with agitation under free radical conditions and (c) the resulting polymer is devolatilized, the improvement wherein said rubber comprises a styrene-butadiene copolymer rubber having a solution viscosity ranging from 20 to 60 cps and containing from 8 to 12 weight percent bound styrene with at least 2 percent, by weight of the rubber, of such styrene in block segments and about equal amounts of styrene in block and random segments, whereby the resulting rubber-modified styrene polymer has an Izod value of at least 4 ft.-lbs./inch of notch and a melt flow rate of at least 3 grams/10 minutes.
Claim 2
Dependent Claim
140 words
In a process for producing rubber-modified styrene polymer, wherein (a) a polymerization feedstock is formed comprising an effective amount up to 30 weight percent of a rubber in styrene monomer in the substantial absence of inert solvent, (b) such feedstock is polymerized with agitation under free radical conditions and (c) the resulting polymer is devolatilized, the improvement wherein said rubber comprises a styrene-butadiene copolymer rubber having a solution viscosity ranging from 20 to 60 cps and containing from 8 to 12 weight percent bound styrene with at least 2 percent, by weight of the rubber, of such styrene in block segments and about equal amounts of styrene in block and random segments, whereby the resulting rubber-modified styrene polymer has an Izod value of at least 4 ft.-lbs./inch of notch and a melt flow rate of at least 3 grams/10 minutes.
Claim 3
Dependent Claim
17 words
The improvement of claim 1 wherein the polymerization feedstock contains from 12 to 25 weight percent rubber.
Claim 4
Dependent Claim
17 words
The improvement of claim 2 wherein the feedstock contains an effective amount of a chain transfer agent.
Claim 5
Dependent Claim
18 words
The improvement of claim 3 wherein the rubber has a solution viscosity ranging from 25 to 45 cps.
Claim 6
Dependent Claim
16 words
The improvement of claim 4 wherein the rubber contains from 9 to 11 weight percent styrene.
Claim 7
Dependent Claim
22 words
The improvement of claim 4 wherein the rubber contains about 10 weight percent styrene and has a solution viscosity about 30 cps.
Claim 8
Dependent Claim
10 words
The product obtained using the improved process of claim 1.
Claim 9
Dependent Claim
10 words
The product obtained using the improved process of claim 6.
References Cited (Backward Citations)
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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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |