US4626583A
Expired / Lapsed
US
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Polysilane-siloxane oligomers and copolymers and methods of making the same
Assignee: Evonik Corp
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Filing: 1985-07-11
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Granted: 1986-12-02
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Expires: 2005-07-11
Abstract
Abstract Linear polysilane-siloxane copolymers having remarkable sensitivity to radiation have the general formula [(SiMe.sub.2).sub.m ].sub.a [(OSiMeR).sub.n ].sub.b wherein Me is a methyl group, R is lower alkyl or phenyl, m=4 to about 30 inclusive, n=1 to about 100 inclusive, a and b may each be 1 to about 10 inclusive, and a units alternate with b units. The copolymers of the invention may be in the form of oligomers, random copolymers where n=1 to 9, block copolymers where n=10 to 100, and mixed (random and block) copolymers. These copolymers may also be in the form of modified copolymers having reactive functional groups such as acrylate, methacrylate, vinyl or other unsaturated substitutions. The copolymers may be produced by formation of a halogen terminated oligomer of a polysilane or polysilane-siloxane copolymer, followed by coupling the oligomers with themselves or with distinct higher molecular weight silanol terminated siloxane species. Depending upon their specific structures, the copolymers respond to electron beam or ultraviolet radiation by depolymerizing, behaving as photoinitiators for acrylate polymerization or cross-linking.
Inventors
- 👤 Barry C. Arkles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:40
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/42; C08G77/485
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
52 words
A linear polysilane-siloxane copolymer of the general formula: [(SiMe.sub.2).sub.m ].sub.a [(OSiMeR).sub.n ].sub.b wherein Me is a methyl group, R is lower aklyl or aryl, m=4 to about 30 inclusive, n=1 to about 100 inclusive, a and b are each 1 to about 10 inclusive , and a units alternate with b units.
Claim 2
Dependent Claim
52 words
A linear polysilane-siloxane copolymer of the general formula: [(SiMe.sub.2).sub.m ].sub.a [(OSiMeR).sub.n ].sub.b wherein Me is a methyl group, R is lower aklyl or aryl, m=4 to about 30 inclusive, n=1 to about 100 inclusive, a and b are each 1 to about 10 inclusive , and a units alternate with b units.
Claim 3
Dependent Claim
18 words
A polysilane-siloxane copolymer according to claim 1 which is a random copolymer wherein n=1 to about 9 inclusive.
Claim 4
Dependent Claim
19 words
A polysilane-siloxane copolymer according to claim 1 which is a block copolymer wherein n=about 10 to about 100 inclusive.
Claim 5
Dependent Claim
11 words
A polysilane-siloxane copolymer according to claim 1 which is an oligomer.
Claim 6
Dependent Claim
10 words
A polysilane-siloxane oligomer according to claim 4 which is photoreactive.
Claim 7
Dependent Claim
25 words
A polysilane-siloxane copolymer according to claim 1 wherein the copolymer is modified by the incorporation of acrylate functional pendant groups on some of said siloxanes.
Claim 8
Dependent Claim
84 words
A modified linear polysilane-siloxane copolymer of the general formula: [(SiMe.sub.2).sub.m ].sub.a [(OSiMeR').sub.n ].sub.b wherein Me is a methyl group, R' alternates between lower alkyl or aryl on some Si atoms and a reactive group on other Si atoms, wherein the reactive group is selecte from the group consisting of acrylate, methacrylate, vinyl, and other unsaturated functional groups, m=4 to about 30 inclusive, n=1 to about 100 inclusive, a and b are each 1 to about 10 inclusive, and a units alternate with b units.
Claim 9
Dependent Claim
84 words
A modified linear polysilane-siloxane copolymer of the general formula: [(SiMe.sub.2).sub.m ].sub.a [(OSiMeR').sub.n ].sub.b wherein Me is a methyl group, R' alternates between lower alkyl or aryl on some Si atoms and a reactive group on other Si atoms, wherein the reactive group is selecte from the group consisting of acrylate, methacrylate, vinyl, and other unsaturated functional groups, m=4 to about 30 inclusive, n=1 to about 100 inclusive, a and b are each 1 to about 10 inclusive, and a units alternate with b units.
Claim 10
Dependent Claim
20 words
A modified polysilane-siloxane copolymer according to claim 7 which is a block copolymer wherein n=about 10 to about 100 inclusive.
Claim 11
Dependent Claim
24 words
A method of preparing high molecular weight linear polysilane-siloxane random copolymers of claim 2 comprising condensing a halogen terminated polysilane-siloxane oligomer by sodium condensation.
Claim 12
Dependent Claim
24 words
A method according to claim 9 wherein said halogen terminated polysilane-siloxane is prepared by condensing a halogenated disiloxane with a dichlorosilane by lithium condensation.
Claim 13
Dependent Claim
20 words
A method of preparing high molecular weight polysilane-siloxane random copolymers of claim 2 comprising hydrolyzing a halogen terminated polysilane-siloxane oligomer.
Claim 14
Dependent Claim
25 words
A method according to claim 11 wherein said halogen terminated polysilane-siloxane oligomer is prepared by condensing a halogenated disiloxane with a dichlorosilane by lithium condensation.
Claim 15
Dependent Claim
23 words
A method of preparing polysilane-siloxane block copolymers of claim 3 comprising reacting a halogen terminated permethylsilane oligomer with a silanol terminated organofunctional siloxane.
Claim 16
Dependent Claim
14 words
A method according to claim 13 wherein said siloxane is a silanol terminated polydimethylsiloxane.
Claim 17
Dependent Claim
28 words
A method of preparing modified polysilane-siloxane copolymers of claim 7 comprising reacting a halogen terminated permethylsilane-siloxane oligomer with a silanol terminated organofunctional siloxane and a halogenated organofunctional silane.
Claim 18
Dependent Claim
23 words
A method according to claim 15 wherein the organofunctionality of said silane includes at least one acrylate or methacrylate group per silicon atom.
Claim 19
Dependent Claim
11 words
A method according to claim 16 wherein said silane is acryloxypropylmethyldichlorosilane.
Claim 20
Dependent Claim
13 words
A method according to claim 15 wherein said siloxane is silanol terminated polydimethylsiloxane.
References Cited (Backward Citations)
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