Patent US4780509A successfully refreshed from Google Patents.
US4780509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of impact-resistant thermoplastic molding
Assignee: BASF SE
•
Filing: 1987-04-28
•
Granted: 1988-10-25
•
Expires: 2007-04-28
Abstract
Abstract Impact-resistant thermoplastic molding materials based on a resin A containing one or more vinylaromatic monomers are prepared by reacting the resin A (component A) with one or more monomers from the group consisting of the α,β-unsaturated dicarbonyl compounds (component B) by a process in which the reaction is carried out in a melt of A in the presence of B and in the absence of initiators, and the resin A used is one which contains from 3 to 50% by weight, based on A, of one or more elastomers a 1 (rubber) and has been prepared in a conventional manner by polymerizing one or more vinylaromatic monomers of 8 to 12 carbon atoms in the presence of the elastomer a 1 are used for the production of moldings.
Inventors
- 👤 Christof Taubitz
- 👤 Erhard Seiler
- 👤 Lothar Schlemmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:28
CPC Classifications
C; C08; C08F; C08F285/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
187 words
A process for the preparation of an impact-resistant thermoplastic molding material based on a resin A containing one or more vinylaromatic monomers by reacting the resin A (component A) with one or more monomers selected from the group consisting of the α, β-unsaturated dicarbonyl compounds (component B) at from 140° to 240° C. in a melt of A in the presence of B and in the absence of initiators, wherein the reaction is carried out in a conventional screw extruder for a residence time of from 1 to 7 minutes at a velocity gradient in the radial play between the outer edge of the screw and the barrel wall of more than 2000 sec -1 ; the resin A used is one which contains from 3 to 50% by weight, based on A, of one or more elastomers a 1 (rubber) and has been prepared in conventional manner by polymerization of one or more vinylaromatic monomers of 8 to 12 carbon atoms in the presence of the elastomer a 1 ; and the monomers B are selected from the group consisting of fumaric acid and N-phenyl-substituted maleimide.
Claim 2
Dependent Claim
187 words
A process for the preparation of an impact-resistant thermoplastic molding material based on a resin A containing one or more vinylaromatic monomers by reacting the resin A (component A) with one or more monomers selected from the group consisting of the α, β-unsaturated dicarbonyl compounds (component B) at from 140° to 240° C. in a melt of A in the presence of B and in the absence of initiators, wherein the reaction is carried out in a conventional screw extruder for a residence time of from 1 to 7 minutes at a velocity gradient in the radial play between the outer edge of the screw and the barrel wall of more than 2000 sec -1 ; the resin A used is one which contains from 3 to 50% by weight, based on A, of one or more elastomers a 1 (rubber) and has been prepared in conventional manner by polymerization of one or more vinylaromatic monomers of 8 to 12 carbon atoms in the presence of the elastomer a 1 ; and the monomers B are selected from the group consisting of fumaric acid and N-phenyl-substituted maleimide.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein the reaction is carried out in the presence of lubricants and/or mold release agents.
Claim 4
Dependent Claim
61 words
A process as claimed in claim 1, wherein the resin A used is one which contains from 3 to 30% by weight, based on A, of one or more elastomers a 1 (rubber) based on polybutadiene and/or on butadiene/styrene two-block copolymers and has been prepared in a conventional manner by polymerizing styrene in the presence of the elastomer a 1 .
Claim 5
Dependent Claim
14 words
A process as claimed in claim 1, wherein the monomer B is fumaric acid.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1, wherein the monomers B are used in an amount of from 0.05 to 20% by weight, based on A+B.
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) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |