US3929936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polystyrene
Assignee: Dow Chemical Co
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Filing: 1973-04-16
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Granted: 1975-12-30
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Expires: 1993-04-16
Abstract
Abstract Improved impact polystyrenes are obtained when styrene is polymerized with a cis-butadiene styrene copolymer rubber as the toughening agent.
Inventors
- 👤 Thomas Ellis Davies
- 👤 Hubert Brian Hopkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:35
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/06; C08L9/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A COMPOSITION COMPRISING A MAJOR PROPORTION OF A STYRENE POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS AND COPOLYMERS OF STYRENE AND THE NUCLEAR METHYL SUBSTITUTED STYRENES HAVING A SOFTENING POINT GREATER THAN 70*C AND, AS TOUGHENING AGENT, A MINOR PROPORTION OF A COPOLYMER OF BUTADIENE AND STYRENE, CONTAINING FROM 50 TO 95 PERCENT POLYMERIZED BUTADIENE, FROM 30 TO 95 PERCENT OF SAID POLYMERIZED BUTADIENE UNITS HAVING THE FORMULA -CH2-CH=CH-CH2- AND IN WHICH THE STEREO CONFIGURATION ABOUT THE DOUBLE BOND IS CIS, SAID TOUGHENING AGENT HAVING BEEN OBTAINED BY POLYMERIZATION WITH AN ALKYL LITHIUM CATALYST, SAID COMPOSITION CONTAINING THE TOUGHENING AGENT IN DISCRETE PARTICULATE FORM, DISPERSED IN A MATRIX OF THE STYRENE POLYMER.
Claim 2
Dependent Claim
113 words
A COMPOSITION COMPRISING A MAJOR PROPORTION OF A STYRENE POLYMER SELECTED FROM THE GROUP CONSISTING OF HOMOPOLYMERS AND COPOLYMERS OF STYRENE AND THE NUCLEAR METHYL SUBSTITUTED STYRENES HAVING A SOFTENING POINT GREATER THAN 70*C AND, AS TOUGHENING AGENT, A MINOR PROPORTION OF A COPOLYMER OF BUTADIENE AND STYRENE, CONTAINING FROM 50 TO 95 PERCENT POLYMERIZED BUTADIENE, FROM 30 TO 95 PERCENT OF SAID POLYMERIZED BUTADIENE UNITS HAVING THE FORMULA -CH2-CH=CH-CH2- AND IN WHICH THE STEREO CONFIGURATION ABOUT THE DOUBLE BOND IS CIS, SAID TOUGHENING AGENT HAVING BEEN OBTAINED BY POLYMERIZATION WITH AN ALKYL LITHIUM CATALYST, SAID COMPOSITION CONTAINING THE TOUGHENING AGENT IN DISCRETE PARTICULATE FORM, DISPERSED IN A MATRIX OF THE STYRENE POLYMER.
Claim 3
Dependent Claim
13 words
The composition as claimed in claim 1, wherein the styrene polymer is polystyrene.
Claim 4
Dependent Claim
21 words
The composition as claimed in claim 1, wherein from 30-75 percent of the polymerized butadiene units have said formula and configuration.
Claim 5
Dependent Claim
27 words
The composition as claimed in claim 3, wherein the weight of the toughening agent amounts to 1 to 20 percent of the weight of the styrene polymer.
Claim 6
Dependent Claim
67 words
The composition comprising a major proportion of a styrene copolymer containing up to 35 percent of a copolymerizable non-vinyl aromatic monomer, said copolymer having a softening greater than 70*C, and, as a toughening agent, up to 20 percent of a copolymer of butadiene and styrene, containing from 50 to 95 percent of polymerized butadiene, from 30 to 95 percent of said polymerized butadiene units having the formula:
Claim 7
Dependent Claim
67 words
The composition comprising a major proportion of a styrene copolymer containing up to 35 percent of a copolymerizable non-vinyl aromatic monomer, said copolymer having a softening greater than 70*C, and, as a toughening agent, up to 20 percent of a copolymer of butadiene and styrene, containing from 50 to 95 percent of polymerized butadiene, from 30 to 95 percent of said polymerized butadiene units having the formula:
Claim 8
Dependent Claim
12 words
A composition as claimed in claim 5, wherein the comonomer is acrylonitrile.
References Cited (Backward Citations)
US3264374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |