Patent EP0091291A2 successfully refreshed from Google Patents.
EP0091291A2
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EP
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Room temperature stable, heat activated organopolysiloxane compositions
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1983-03-31
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Granted: —
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Expires: 2003-03-31
Abstract
Abstract Organopolysiloxane compositions which react byway of a hydrosilylation reaction to undergo an increase in viscosity have improved resistance to reaction at room temperature (longer pot life) and/or an improved reaction rate at elevated temperature (shorter cure time) than analogous compositions of the art by incorporating therein an unsaturated hydrocarbon having from 6 to 10 carbon atoms, a terminal acetylenic linkage and an olefinic linkage conjugated therewith. The resulting compositions are useful for preparing various cured siloxanes such as resins, elastomers, gels and foams.
Inventors
- 👤 Akihiko Shirahata
- 👤 Shosaku Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 14:03
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/01; C08L; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
312 words
A composition obtained by mixing (a) an alkenyl group-containing organopolysiloxane component comprising at least one siloxane unit having the formula SiO (4-a-b)/2 wherein R 1 denotes a silicon-bonded alkenyl group having from 2 to 4 carbon atoms, inclusive, R 2 denotes a silicon-bonded substituted or unsubstituted monovalent hydrocarbon group, a has a value of from 1 to 3, b has a value of from 0 to 2 and a + b has a value of from 1 to 3, all values inclusive, any remaining siloxane units in the alkenyl group-containing organopolysiloxane having the formula SiO (4-x)/2 wherein R is as denoted above and x has a value of from 0 to 3, inclusive; (b) an organohydrogenpolysiloxane component comprising at least one siloxane unit having the formula H c SiO (4-c-d)/2 wherein R 3 denotes a silicon-bonded substituted or unsubstituted monovalent hydrocarbon group, c has a value of from 1 to 3, d has a value of from 0 to 2 and c + d has a value of from 1 to 3, all values inclusive, any remaining siloxane units in the organohydrogenpolysiloxane having the formula SiO (4-y)/2 wherein R 3 is as denoted above and Y has a value of from 0 to 3, inclusive; (c) a catalyzing amount of a hydrosilylation catalyst and characterized in that this-composition contains (d) a cure inhibiting amount of an unsaturated hydrocarbon component having the formula HC=C-CR 4 -CR 5 R 6 wherein each R 4 , R 5 and R 6 denotes, independently, a hydrogen atom, a monovalent hydrocarbon group or a divalent hydrocarbon group with the requirements that the total number of carbon atoms in the R , R 5 and R groups has a value of from 2 to 6 and when R 4 and R 5 or R 5 and R 6 are divalent they are bonded together by their second valenae.
Claim 2
Dependent Claim
312 words
A composition obtained by mixing (a) an alkenyl group-containing organopolysiloxane component comprising at least one siloxane unit having the formula SiO (4-a-b)/2 wherein R 1 denotes a silicon-bonded alkenyl group having from 2 to 4 carbon atoms, inclusive, R 2 denotes a silicon-bonded substituted or unsubstituted monovalent hydrocarbon group, a has a value of from 1 to 3, b has a value of from 0 to 2 and a + b has a value of from 1 to 3, all values inclusive, any remaining siloxane units in the alkenyl group-containing organopolysiloxane having the formula SiO (4-x)/2 wherein R is as denoted above and x has a value of from 0 to 3, inclusive; (b) an organohydrogenpolysiloxane component comprising at least one siloxane unit having the formula H c SiO (4-c-d)/2 wherein R 3 denotes a silicon-bonded substituted or unsubstituted monovalent hydrocarbon group, c has a value of from 1 to 3, d has a value of from 0 to 2 and c + d has a value of from 1 to 3, all values inclusive, any remaining siloxane units in the organohydrogenpolysiloxane having the formula SiO (4-y)/2 wherein R 3 is as denoted above and Y has a value of from 0 to 3, inclusive; (c) a catalyzing amount of a hydrosilylation catalyst and characterized in that this-composition contains (d) a cure inhibiting amount of an unsaturated hydrocarbon component having the formula HC=C-CR 4 -CR 5 R 6 wherein each R 4 , R 5 and R 6 denotes, independently, a hydrogen atom, a monovalent hydrocarbon group or a divalent hydrocarbon group with the requirements that the total number of carbon atoms in the R , R 5 and R groups has a value of from 2 to 6 and when R 4 and R 5 or R 5 and R 6 are divalent they are bonded together by their second valenae.
References Cited (Backward Citations)
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