US4223096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber-modified terpolymer with improved molding characteristics
Assignee: Bayer Antwerpen NV
•
Filing: 1978-10-02
•
Granted: 1980-09-16
•
Expires: 1998-10-02
Abstract
Abstract Rubber-modified terpolymers of from 50 to 83% of a monoalkenyl aromatic monomer, from 15 to 30% of an unsaturated dicarboxylic acid anhydride, from 2 to 20% of an unsaturated nitrile are described which are useful as molding compositions.
Inventors
- 👤 Yoon C. Lee
- 👤 Quirino A. Trementozzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:47
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
185 words
A process for the production of a polymeric molding composition which comprises polymerizing a monomer mixture comprising from 50 to 83% by weight of a vinylaromatic monomer, from 15 to 30% by weight of an unsaturated dicarboxylic acid anhydride and from 2 to 20% by weight of an unsaturated nitrile in the presence of from 2 to 30% by weight based on the composition weight of a rubber having a glass transition temperature below 0° C. to form a rubber substrate grafted with a superstrate terpolymer and dispersed in a matrix terpolymer; said process comprising forming a solution comprising the vinylaromatic monomer, the unsaturated nitrile monomer, a minor amount of the anhydride monomer and the rubber; catalytically initiating polymerization of the mixture at a temperature below 120° C., and maintaining a low anhydride monomer concentration by gradual continuous addition of the balance of the anhydride monomer during the polymerization reaction so as to produce a rubber-modified terpolymer of uniform composition that remains thermoformable after having been exposed to temperatures of 190° C. for 30 minutes and thereafter Brabender compounded at 240° C. for 2 minutes.
Claim 2
Dependent Claim
185 words
A process for the production of a polymeric molding composition which comprises polymerizing a monomer mixture comprising from 50 to 83% by weight of a vinylaromatic monomer, from 15 to 30% by weight of an unsaturated dicarboxylic acid anhydride and from 2 to 20% by weight of an unsaturated nitrile in the presence of from 2 to 30% by weight based on the composition weight of a rubber having a glass transition temperature below 0° C. to form a rubber substrate grafted with a superstrate terpolymer and dispersed in a matrix terpolymer; said process comprising forming a solution comprising the vinylaromatic monomer, the unsaturated nitrile monomer, a minor amount of the anhydride monomer and the rubber; catalytically initiating polymerization of the mixture at a temperature below 120° C., and maintaining a low anhydride monomer concentration by gradual continuous addition of the balance of the anhydride monomer during the polymerization reaction so as to produce a rubber-modified terpolymer of uniform composition that remains thermoformable after having been exposed to temperatures of 190° C. for 30 minutes and thereafter Brabender compounded at 240° C. for 2 minutes.
Claim 3
Dependent Claim
36 words
A process according to claim 1 in which the reaction temperature is maintained below 100° C. and which employs an initiator selected from the group consisting of tert-butyl peracetate, tert-butyl peroctate, tert-butyl perbenzoate and mixtures thereof.
Claim 4
Dependent Claim
24 words
A process according to claim 1 in which up to 1% by weight of a chain transfer agent is added to the polymerization mixture.
Claim 5
Dependent Claim
28 words
A process according to claim 3 in which the chain transfer agent is selected from the group consisting of tertiary dodecyl mercaptan, terpinolene, myrcene, d-limonene, norbornene and indene.
Claim 6
Dependent Claim
180 words
A process for the production of a polymeric molding composition which comprises polymerizing a monomer mixture comprising from 56 to 78% by weight of styrene, from 20 to 30% by weight of maleic anhydride and from 2 to 14% by weight of acrylonitrile in the presence of from 2 to 30% by weight based on the composition weight of a diene rubber having a glass transition temperature below -30° C. and a chain transfer agent to form a rubber substrate grafted with a superstrate terpolymer and dispersed in a matrix terpolymer; said process comprising forming a solution comprising the styrene, the acrylonitrile, a minor amount of the maleic anhydride and the diene rubber; catalytically initiating polymerization of the mixture at a temperature below 120° C., maintaining a low anhydride monomer concentration by gradual addition of the balance of the maleic anhydride during the polymerization reaction so as to produce a rubber-modified terpolymer of uniform composition that remains thermoformable after having been exposed to temperatures of 220° C. for an hour and thereafter Brabender compounded for 10 minutes at 240° C.
Claim 7
Dependent Claim
180 words
A process for the production of a polymeric molding composition which comprises polymerizing a monomer mixture comprising from 56 to 78% by weight of styrene, from 20 to 30% by weight of maleic anhydride and from 2 to 14% by weight of acrylonitrile in the presence of from 2 to 30% by weight based on the composition weight of a diene rubber having a glass transition temperature below -30° C. and a chain transfer agent to form a rubber substrate grafted with a superstrate terpolymer and dispersed in a matrix terpolymer; said process comprising forming a solution comprising the styrene, the acrylonitrile, a minor amount of the maleic anhydride and the diene rubber; catalytically initiating polymerization of the mixture at a temperature below 120° C., maintaining a low anhydride monomer concentration by gradual addition of the balance of the maleic anhydride during the polymerization reaction so as to produce a rubber-modified terpolymer of uniform composition that remains thermoformable after having been exposed to temperatures of 220° C. for an hour and thereafter Brabender compounded for 10 minutes at 240° C.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |