Patent US3823959A successfully refreshed from Google Patents.
Patent US4861829A successfully refreshed from Google Patents.
US4861829A
Expired / Lapsed
US
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Thermoplastic polycarbonate moulding materials
Assignee: Bayer AG
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Filing: 1988-03-28
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Granted: 1989-08-29
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Expires: 2008-03-28
Abstract
Abstract The present invention relates to thermoplastic moulding materials from polydiorganosiloxane-polycarbonate block copolymers and copolymers from styrenes and maleic anhydride and, if appropriate, further conventional additives, and also a process for the preparation of these moulding materials.
Inventors
- 👤 Hans-Jurgen Kress
- 👤 Winfried Paul
- 👤 Horst Peters
- 👤 Christian Lindner
- 👤 Josef Buekers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:18
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A thermoplastic moulding material consisting of A. 40 to 95 parts by weight, relative to the sum of the weight of A.+B., of polydiorganosiloxane-polycarbonate block copolymer, with an average molecular weight M w of 10,000 to 200,000 and containing between about 75% by weight and 99% by weight of aromatic carbonate structural units and containing between 1% by weight and 25% by weight of diorganosiloxy units, the block copolymers, starting from α,ω-bishydroxy-aryloxy terminal group-containing polydiorganosiloxanes, being prepared with a degree of polymerization P n from 5 to 100, and B. 5 to 60 parts by weight, relative to the sum of the weight of A.+B., of a randomly constructed copolymer from 95 to 70% by weight of a vinyl aromatic selected from styrene, α-methylstyrene, nuclear-substituted styrenes and mixtures thereof, and 5 to 30% by weight of maleic anhydride.
Claim 2
Dependent Claim
138 words
A thermoplastic moulding material consisting of A. 40 to 95 parts by weight, relative to the sum of the weight of A.+B., of polydiorganosiloxane-polycarbonate block copolymer, with an average molecular weight M w of 10,000 to 200,000 and containing between about 75% by weight and 99% by weight of aromatic carbonate structural units and containing between 1% by weight and 25% by weight of diorganosiloxy units, the block copolymers, starting from α,ω-bishydroxy-aryloxy terminal group-containing polydiorganosiloxanes, being prepared with a degree of polymerization P n from 5 to 100, and B. 5 to 60 parts by weight, relative to the sum of the weight of A.+B., of a randomly constructed copolymer from 95 to 70% by weight of a vinyl aromatic selected from styrene, α-methylstyrene, nuclear-substituted styrenes and mixtures thereof, and 5 to 30% by weight of maleic anhydride.
Claim 3
Dependent Claim
28 words
A moulding material according to claim 1, in which the block copolymer of component A. is prepared with a degree of polymerisation P n of 20 to 80.
Claim 4
Dependent Claim
41 words
A moulding material according to claim 1, in which component A is a mixture of polydiorganosiloxane-polycarbonate block copolymers with other siloxane-free thermoplastic polycarbonates, the total content of diorganosiloxy units in this polycarbonate mixture again being between 1% and 25% by weight.
Claim 5
Dependent Claim
31 words
Moulding materials according to claim 1, in which component B. is constructed from 90 to 75% by weight of the vinyl aromatic and 10 to 25% by weight of maleic anhydride.
Claim 6
Dependent Claim
26 words
A moulding material according to claim 1, additionally comprising at least one additive selected from stabilizers, flow agents, flameproofing agents, mould release agents and antistatic agents.
Claim 7
Dependent Claim
42 words
A process for the production of a moulding material according to claim 1, in which the components A and B are mixed and the melt is compounded or extruded at a temperature from 220° to 330° C. in compounding or extrusion equipment.
Claim 8
Dependent Claim
39 words
A process for the production of a moulding material according to claim 1, in which solutions of components A and B are mixed in an organic solvent therefore and then the solution mixture is concentrated in appropriate evaporation equipment.
Claim 9
Dependent Claim
35 words
A process according to claim 6, in which at least one additive selected from stabilizers, flow agents, flameproofing agents, mould release agents and anti-static agents, is included in the mixture of components A and B.
Claim 10
Dependent Claim
35 words
A process according to claim 7, in which at least one additive selected from stabilizers, flow agents, flameproofing agents, mould release agents and anti-static agents, is included in the mixture of components A and B.
Claim 11
Dependent Claim
12 words
Optical device prepared by using a thermoplastic moulding material of claim 1.
References Cited (Backward Citations)
US3862998A
Cited
US4569970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |