Silicone oils and solvents thickened by silicone elastomers
First Claim
1. A method of thickening solvents comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 and optionally an .tbd.Si--H containing polysiloxane of formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H where R, R'"'"', and R" are alkyl groups of 1-6 carbon atoms;
- a is 0-250;
b is 1-250; and
c is 0-250;
with (B) an alpha, omega-diene as only the unsaturated hydrocarbon of formula CH2 ═
CH(CH2)x CH═
CH2 where x is 1-20;
conducting the reaction in the presence of a platinum catalyst and (C) a solvent selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and
continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene.
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Accused Products
Abstract
Silicone gels are made by reacting an .tbd.Si--H containing polysiloxane with an alpha, omega-diene. The reaction is conducted in the presence of a platinum catalyst and in the presence of a low molecular weight silicone oil. The reaction is continued until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene. The silicone gel can then be crumbled into a silicone powder using mechanical force. When additional amounts of low molecular weight silicone oil are added to the gel, and the silicone oil and the gel are subjected to shear force, a silicone paste can be formed.
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Citations
18 Claims
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1. A method of thickening solvents comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 and optionally an .tbd.Si--H containing polysiloxane of formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H where R, R'"'"', and R" are alkyl groups of 1-6 carbon atoms;
- a is 0-250;
b is 1-250; and
c is 0-250;
with (B) an alpha, omega-diene as only the unsaturated hydrocarbon of formula CH2 ═
CH(CH2)x CH═
CH2 where x is 1-20;
conducting the reaction in the presence of a platinum catalyst and (C) a solvent selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and
continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene. - View Dependent Claims (2, 3, 4, 5, 6)
- a is 0-250;
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7. A method of thickening silicone oils to gel-like consistency comprising reacting (A) an .tbd.Si--H containing polysiloxane of formula R3 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR3 and optionally an .tbd.Si--H containing polysiloxane of formula HR2 SiO(R'"'"'2 SiO)c SiR2 H or formula HR2 SiO(R'"'"'2 SiO)a (R"HSiO)b SiR2 H where R, R'"'"', and R" are alkyl groups of 1-6 carbon atoms;
- a is 0-250;
b is 1-250; and
c is 0-250;
with (B) an alpha, omega-diene as the only unsaturated hydrocarbon of formula CH2 ═
CH(CH2)x CH═
CH2 where x is 1-20;
conducting the reaction in the presence of a platinum catalyst and (C) a silicone oil of formula R13 SiO(R12 SiO)y SiR13 or (R12 SiO)z where R1 is an alkyl group of 1-20 carbon atoms or an aryl radical, y is 0-375, and z is 3-9; and
continuing the reaction until a gel is formed by crosslinking and addition of .tbd.Si--H across double bonds in the alpha, omega-diene. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- a is 0-250;
Specification