US4681922A
Expired / Lapsed
US
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Thermoplastic polysiloxane-polyester (carbonate) block copolymers, their preparation and use
Assignee: Bayer AG
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Filing: 1984-11-29
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Granted: 1987-07-21
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Expires: 2004-11-29
Abstract
Abstract Siloxane/polyester (carbonate) block copolymers comprising wholly aromatic polyester or polyestercarbonate units and from 0.5 to 7.5% by weight of polysiloxane blocks, exhibit an improved melt flowability without impairment of the heat stability.
Inventors
- 👤 Manfred Schmidt
- 👤 Winfried Paul
- 👤 Dieter Freitag
- 👤 Dietrich Rathmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:18
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/445; C08G63/00; C08G63/68; C08G63/695; C08G77/448
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A siloxane-polyester(carbonate) block copolymer with repeat structural units of the formulae ##STR8## wherein R and R 1 each denote optionally halogen-substituted C 1 -C 20 -alkyl, C 2 -C 6 -alkenyl, C 6 -C 14 -aryl, C 7 -C 15 -aralkyl or C 7 -C 15 -alkaryl, a, b and c together denote a number from 10 to 100 and Ar denotes a mononuclear or polynuclear aromatic radical having 6 to 30 C atoms, and the ratio m/n is 1:9 to 9:1, characterized in that the structure units I represent 0.5 to 7.5% by weight and the structural units II or III represent 99.5 to 92.5% by weight of the siloxane-polyester-(carbonate) block copolymer (disregarding the terminating groups), and the ratio of the isophthalic acid units to the terephthalic acid units in the structural units II and III is 3:7 to 7:3.
Claim 2
Dependent Claim
141 words
A siloxane-polyester(carbonate) block copolymer with repeat structural units of the formulae ##STR8## wherein R and R 1 each denote optionally halogen-substituted C 1 -C 20 -alkyl, C 2 -C 6 -alkenyl, C 6 -C 14 -aryl, C 7 -C 15 -aralkyl or C 7 -C 15 -alkaryl, a, b and c together denote a number from 10 to 100 and Ar denotes a mononuclear or polynuclear aromatic radical having 6 to 30 C atoms, and the ratio m/n is 1:9 to 9:1, characterized in that the structure units I represent 0.5 to 7.5% by weight and the structural units II or III represent 99.5 to 92.5% by weight of the siloxane-polyester-(carbonate) block copolymer (disregarding the terminating groups), and the ratio of the isophthalic acid units to the terephthalic acid units in the structural units II and III is 3:7 to 7:3.
Claim 3
Dependent Claim
56 words
A siloxane-polyester(carbonate) block copolymer according to claim 1, wherein the structural units I represent 1 to 5% by weight and the structural units II and III represent 99 to 95% by weight, the ratio m/n is 1:9 to 9:1 and the ratio of the isophthalic acid units to the terephthalic acid units is 4.5:5.5 to 5.5:4.5.
Claim 4
Dependent Claim
57 words
A siloxane-polyester(carbonate) block copolymer according to claim 1, wherein R and R 1 denote methyl, a, b and c together denote a number from 20 to 80, the ratio m/n is 3:7 to 8:2, and Ar denotes the radical of bisphenol A, and the ratio of the isophthalic acid units to the terephthalic acid units is 1:1.
Claim 5
Dependent Claim
86 words
A process for the preparation of the siloxane-polyester-(carbonate) block copolymers according to claim 1, characterized in that at least one bisphenol of the formula HO--Ar--OH and at least one diorganosiloxane of the formula ##STR9## are reacted with mixtures of isophthalic and terephthalic acid dichlorides in a two-phase system consisting of an aqueous alkali solution and a water-immiscible organic solvent, in a phase boundary reaction, in the presence of a catalyst Ar, R, R 1 , a, b and c having the meanings given in claim 1.
Claim 6
Dependent Claim
16 words
The use of the siloxane-polyester(carbonate) block copolymers according to claim 1 for the production of mouldings.
Claim 7
Dependent Claim
14 words
A process in accordance with claim 4, wherein the reaction mixture further comprises phosgene.
Claim 8
Dependent Claim
19 words
A process in accordance with claim 4, wherein the reaction mixture further comprises chain stoppers, branching agents and antioxidants.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |