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Patent US4657989A successfully refreshed from Google Patents.
US4657989A
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Method for preparing siloxane-carbonate block copolymers
Assignee: General Electric Co
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Filing: 1985-06-11
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Granted: 1987-04-14
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Expires: 2005-06-11
Abstract
Abstract Siloxane-carbonate block copolymers are prepared by reacting (A) at least one siloxane compound with (B) at least one polycarbonate compound, one of reagents A and B being anionic and the other being reactive with nucleophiles. The siloxane compound is preferably a linear chlorosilane-terminated polysiloxane, a cyclic polysiloxane or a "living" polysiloxane anion. The polycarbonate composition may be a cyclic polycarbonate oligomer composition, preferably an oligomer mixture, or may be prepared by the reaction of such an oligomer composition with a polycarbonate formation catalyst such as tetramethylammonium tetraphenylborate.
Inventors
- 👤 Thomas L. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:20
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/448; C08G64/00; C08G64/18; C08G64/186
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
A method for preparing a siloxane-carbonate block copolymer which comprises reacting (A) at least one nucleophile-reactive siloxane compound with (B) at least one polycarbonate compound having the formula ##STR1## wherein X is a polycarbonate end group, Z 1 is one equivalent of a cation other than hydrogen, n is at least 1, at least about 60% of the total number of R 2 values are divalent aromatic radicals and the balance of said R 2 values are divalent aliphatic, alicyclic or aromatic radicals.
Claim 2
Independent Claim
83 words
A method for preparing a siloxane-carbonate block copolymer which comprises reacting (A) at least one nucleophile-reactive siloxane compound with (B) at least one polycarbonate compound having the formula ##STR1## wherein X is a polycarbonate end group, Z 1 is one equivalent of a cation other than hydrogen, n is at least 1, at least about 60% of the total number of R 2 values are divalent aromatic radicals and the balance of said R 2 values are divalent aliphatic, alicyclic or aromatic radicals.
Claim 3
Dependent Claim
31 words
A method according to claim 1 wherein reagent A comprises at least one structural unit of the formula ##STR2## wherein each R 1 is independently a hydrocarbon or substituted hydrocarbon radical.
Claim 4
Dependent Claim
25 words
A method according to claim 2 wherein reagent A comprises a plurality of said structural units and all R 1 radicals are methyl or phenyl.
Claim 5
Dependent Claim
51 words
A method according to claim 3 wherein each R 2 radical has the formula --A.sup.1 --Y--A.sup.2 --, (III) wherein each of A 1 and A 2 is a single-ring divalent aromatic radical and Y is a bridging radical in which one or two atoms separate A 1 from A 2 .
Claim 6
Dependent Claim
23 words
A method according to claim 4 wherein reagent B is prepared by contacting a cyclic polycarbonate oligomer composition with a polycarbonate formation catalyst.
Claim 7
Dependent Claim
12 words
A method according to claim 5 wherein each R 1 is methyl.
Claim 8
Dependent Claim
31 words
A method according to claim 6 wherein the polycarbonate formation catalyst has the formula ##STR3## wherein M is one equivalent of a cation other than hydrogen and Z 2 is phenyl.
Claim 9
Dependent Claim
37 words
A method according to claim 7 wherein M has the formula (R.sup.3).sub.4 Q.sup.⊕, (VI) wherein each R 3 is independently a C 1-4 primary alkyl or C 6-10 aryl radical and Q is nitrogen, phosphorus or arsenic.
Claim 10
Dependent Claim
21 words
A method according to claim 6 wherein the reaction is conducted at a temperature in the range of about 200°-350° C.
Claim 11
Dependent Claim
22 words
A method according to claim 6 wherein reagent A is a linear polysiloxane containing chlorine atoms bound to silicon as end groups.
Claim 12
Dependent Claim
13 words
A method according to claim 6 wherein reagent A is a cyclic polysiloxane.
Claim 13
Dependent Claim
11 words
A method according to claim 11 wherein reagent A is octamethyltetrasiloxane.
Claim 14
Dependent Claim
27 words
A method according to claim 9 wherein each of A 1 and A 2 is p-phenylene, Y is isopropylidene and the polycarbonate formation catalyst is tetramethylammonium tetraphenylborate.
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |