Addition curing silicone compositions
First Claim
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1. An addition curing silicone composition with a low viscosity in the uncured state and a high physical strength in the cured state comprising (A) 100 parts by weight of a vinyl-containing diorganopolysiloxane having a viscosity varying from 100 to 200,000 centipoise at 25°
- C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;
(B) from 0.1 to 500 parts per million of a platinum catalyst;
(C) from 0.1 to 25 parts by weight of a crosslinker selected from the class consisting of hydride resins having only terminal hydrogen atoms and linear hydride polysiloxanes wherein said linear hydride polysiloxane has hydrogen atoms only in the internal position of the siloxane chain, and (D) from 75 to 150 parts by weight of a linear hydride polysiloxane coupler having hydrogen atoms bonded only at the terminal silicone atoms in the siloxane chain wherein said coupler has a dimethyl hydrogen siloxy content of from 3.0 to 9.0 mole percent and the viscosity of the linear hydride coupler varies from 1 to 500 centipoise at 25°
C.
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Abstract
An addition curing silicone composition with a low viscosity in the uncured state and high physical strength in the cured state comprising a vinyl-containing diorganopolysiloxane polymer, a platinum catalyst, a hydride cross-linking agent and a linear hydride coupler in which the viscosity of the linear hydride coupler varies from 1 to 1,000 centipoise at 25° C.
92 Citations
24 Claims
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1. An addition curing silicone composition with a low viscosity in the uncured state and a high physical strength in the cured state comprising (A) 100 parts by weight of a vinyl-containing diorganopolysiloxane having a viscosity varying from 100 to 200,000 centipoise at 25°
- C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;
(B) from 0.1 to 500 parts per million of a platinum catalyst;
(C) from 0.1 to 25 parts by weight of a crosslinker selected from the class consisting of hydride resins having only terminal hydrogen atoms and linear hydride polysiloxanes wherein said linear hydride polysiloxane has hydrogen atoms only in the internal position of the siloxane chain, and (D) from 75 to 150 parts by weight of a linear hydride polysiloxane coupler having hydrogen atoms bonded only at the terminal silicone atoms in the siloxane chain wherein said coupler has a dimethyl hydrogen siloxy content of from 3.0 to 9.0 mole percent and the viscosity of the linear hydride coupler varies from 1 to 500 centipoise at 25°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;
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13. A process for forming an addition cure silicone composition with a low viscosity in an uncured state comprising (1) mixing (A) 100 parts by weight of a vinyl-containing diorganopolysiloxane having a viscosity varying from 100 to 200,000 centipoise at 25°
- C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;
(B) from 0.1 to 500 parts per million of a platinum catalyst;
(C) from 0.1 to 25 parts by weight of a crosslinker selected from the class consisting of hydride resins having only terminal hydrogen atoms and linear hydride polysiloxanes wherein said linear hydride polysiloxane has hydrogen atoms only bonded at the internal position of the siloxane chain, and (D) from 4 to 15 parts by weight of a linear hydride polysiloxane coupler having hydrogen atoms bonded only at the terminal silicone atoms in the siloxane chain wherein said coupler has a dimethyl hydrogen siloxy content of from 3.0 to 9.0 mole percent and the viscosity of the linear hydride coupler varies from 1 to 500 centipoise at 25°
C., and (2) allowing the composition to cure to a silicone elastomer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
- C., where the diorganovinylsiloxy content varies from 0.14 to 2.0 mole percent and the organo group is a monovalent hydrocarbon radical;
Specification