Patent EP0205012A2 successfully refreshed from Google Patents.
EP0205012A2
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Method for preparing siloxane-carbonate block copolymers
Assignee: General Electric Co
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Filing: 1986-05-23
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Granted: —
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Expires: 2006-05-23
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 Lane Evans
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:19
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/448; C08G64/00; C08G64/18; C08G64/186
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
39 words
A method for preparing a siloxane-carbonate block copolymer which comprises reacting (A) at least one siloxane compound with (B) at lease one polycarbonate compound, one of reagents A and B being anionic and the other being reactive with nucleophiles.
Claim 2
Independent Claim
39 words
A method for preparing a siloxane-carbonate block copolymer which comprises reacting (A) at least one siloxane compound with (B) at lease one polycarbonate compound, one of reagents A and B being anionic and the other being reactive with nucleophiles.
Claim 3
Dependent Claim
32 words
A method according to claim 1 wherein reagent A comprises at least one structural unit of formula I in the drawings, wherein each R' is independently a hydrocarbon or substituted hydrocarbon radical.
Claim 4
Dependent Claim
46 words
A method according to claim 2 wherein reagent A comprises a plurality of said structural units and all R' radicals are methyl or phenyl, and reagent B comprises structural units of formula II, wherein each R 2 is independently a divalent aliphatic, alicyclic or aromatic radical.
Claim 5
Dependent Claim
44 words
A method according to claim 3 wherein each R 2 radical has formula III, wherein each of A' and A is a single-ring divalent aromatic radical and Y is a bridging radical. in which one or two atoms separate A' from A 2 .
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein reagent A is anionic and reagent B is at least one nucleophile-reactive cyclic polycarbonate oligomer.
Claim 7
Dependent Claim
12 words
A method according to claim 5 wherein each R 1 is methyl.
Claim 8
Dependent Claim
18 words
A method according to claim 6 wherein reagent B consists essentially of a mixture of cyclic polycarbonate oligomers.
Claim 9
Dependent Claim
19 words
A method according to claim 7 wherein each of A' and A 2 is p-phenylene and Y is 2,2-propylene.
Claim 10
Dependent Claim
20 words
A method according to claim 8 wherein the reaction is conducted at a temperature in the range of about 10-75°C.
Claim 11
Dependent Claim
41 words
A method according to claim 4 wherein reagent A is nucleophile-reactive and reagent B has formula IV, wherein X is a polycarbonate end group, Z 1 is one equivalent of a cation other than hydrogen and n is at least 1.
Claim 12
Dependent Claim
23 words
A method according to claim 10 wherein reagent B is prepared by contacting a cyclic polycarbonate oligomer composition with a polycarbonate formation catalyst.
Claim 13
Dependent Claim
11 words
A method according to claim 11 wherein each R' is methyl.
Claim 14
Dependent Claim
30 words
A method according to claim 12 wherein the polycarbonate formation catalyst has formula V, wherein M is one equivalent of a cation other than hydrogen and Z 2 is phenyl.
Claim 15
Dependent Claim
35 words
A method according to claim 13 wherein M has formula VI, wherein each R 3 is independently a C14 primary alkyl or C 6 . 10 aryl radical and Q is nitrogen, phosphorus or arsenic.
Claim 16
Dependent Claim
20 words
A method according to claim 12 wherein the reaction is conducted at a temperature in the range of about 200-350°C.
Claim 17
Dependent Claim
22 words
A method according to claim 12 wherein reagent A is a linear polysiloxane containing chlorine atoms bound to silicon as end groups.
Claim 18
Dependent Claim
13 words
A method according to claim 12 wherein reagent A is a cyclic polysiloxane.
Claim 19
Dependent Claim
11 words
A method according to claim 17 wherein reagent A is octamethyltetrasiloxane.
Claim 20
Dependent Claim
26 words
A method according to claim 15 wherein each of A' and A 2 is p-phenylene, Y is 2,2-propylene and the polycarbonate formation catalyst is tetramethylammonium tetraphenylborate.
References Cited (Backward Citations)
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