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US4663399A
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Polycarbonate-polyether block copolymers, polymer blends containing same and intermediates for the production thereof
Assignee: General Electric Co
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Filing: 1985-08-22
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Granted: 1987-05-05
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Expires: 2005-08-22
Abstract
Abstract Block copolymers of the general formula --polycarbonate--G--polyether glycol-- wherein G is an ester aromatic carbonate and/or an ester-ester linkage, substantially free of aliphatic ether linkages are thermally stable in comparison with prior art block copolymers. They form compatible blends with a number of other thermoplastic resins to produce molded articles with improved resiliency. The block copolymers are produced from novel terminally functional end capped polyalkylene glycols.
Inventors
- 👤 Edward N. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:11
CPC Classifications
C; C08; C08L; C08L69/00; C08G; C08G64/00; C08G64/18; C08G64/183; C08L101/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A polycarbonate polyether block copolymer substantially free of aliphatic carbonate linkages, having a mean weight average molecular weight M w of between about 15,000 and 40,000 and being of the general formula ##STR32## wherein repeating units B comprise soft polyether segments comprising from 5 to 60% by weight of said block copolymer and have mean number average molecular weights M n of between about 500 and 20,000, and wherein G is ##STR33## R is hydrogen, chlorine, bromine or alkyl of from 1 to 3 carbon atoms; m is 1 or 2; X is a bond or C 1 -C 8 alkylene, C 2 to C 8 alkylidene, C 5 to C 15 cycloalkylene, C 5 to C 15 cycloalkylidene, SO 2 , SO, O, CO or ##STR34## r is 6 to 450; and Y is C 2 -C 15 linear or branched alkylene.
Claim 2
Dependent Claim
143 words
A polycarbonate polyether block copolymer substantially free of aliphatic carbonate linkages, having a mean weight average molecular weight M w of between about 15,000 and 40,000 and being of the general formula ##STR32## wherein repeating units B comprise soft polyether segments comprising from 5 to 60% by weight of said block copolymer and have mean number average molecular weights M n of between about 500 and 20,000, and wherein G is ##STR33## R is hydrogen, chlorine, bromine or alkyl of from 1 to 3 carbon atoms; m is 1 or 2; X is a bond or C 1 -C 8 alkylene, C 2 to C 8 alkylidene, C 5 to C 15 cycloalkylene, C 5 to C 15 cycloalkylidene, SO 2 , SO, O, CO or ##STR34## r is 6 to 450; and Y is C 2 -C 15 linear or branched alkylene.
Claim 3
Dependent Claim
68 words
A polycarbonate polyether block copolymer as defined in claim 1 wherein G is ##STR35## R is hydrogen, Y is --CH 2 CH 2 -- or --CH 2 CH 2 CH 2 CH 2 --, polyether segments B have a number average molecular weight M n of about 1500 to 10,000, the block copolymer having an intrinsic viscosity of about 0.5 to about 1.2 dl/g (in CHCl 3 ).
Claim 4
Dependent Claim
32 words
A polycarbonate polyether block copolymer as defined in claim 2 wherein Y is --CH 2 CH 2 and polyether segments B have a number average molecular weight M n of about 3,400.
Claim 5
Dependent Claim
33 words
A polycarbonate polyether block copolymer as defined in claim 2 wherein Y is --CH 2 CH 2 -- and polyether segments B have a number average molecular weight M n of about 8,000.
Claim 6
Dependent Claim
37 words
A polycarbonate polyether block copolymer as defined in claim 2 wherein Y is --CH 2 CH 2 CH 2 CH 2 -- and polyether segments B have a number average molecular weight M n of about 2000.
Claim 7
Dependent Claim
62 words
A polycarbonate polyether block copolymer as defined in claim 1 wherein G is ##STR36## Y is --CH 2 CH 2 -- or --CH 2 CH 2 CH 2 CH 2 --, polyether segments B have a number average molecular weight M n of about 500 to 10,000, the block copolymer having an intrinsic viscosity of about 0.5-1.2 dl./g. (in CHCl 3 ).
Claim 8
Dependent Claim
33 words
A polycarbonate polyether block copolymer as defined in claim 6 wherein Y is --CH 2 CH 2 -- and polyether segments B have a number average molecular weight M n of about 8,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |