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US 6,177,585 B1Granted
Bimetallic platinum catalysts for hydrosilations
AssigneeDow Corning Corporation
InventorsWei Chen, Paul Charles Dinh, Ming-Shin Tzou
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Abstract
A hydrosilation processing a silicon hydride with an unsaturated reactant in the presence of a supported bimetallic catalyst comprising an active hydrosilating metal such as platinum in elemental or compound form, and a surface segregating metal such as copper in elemental or compound form on a support.
Claims26
A hydrosilation process comprising:
- (A) contacting a silicon hydride described by formula R1aHbSiX4−a−b where each R1 is independently selected from the group consisting of alkyls comprising one to about 20 carbon atoms, cycloalkyls comprising about four to 12 carbon atoms, and aryls;
- each X is a halogen;
- a=0 to 3, b=1 to 3, and a+b=1 to 4;
- and
- (B) an unsaturated reactant selected from the group consisting of
- (i) substituted and unsubstituted unsaturated hydrocarbon compounds,
- (ii) silicon compounds comprising substituted or unsubstituted unsaturated hydrocarbon substituents, and
- (iii) mixtures of (i) and (ii);
- in the presence of a supported bimetallic catalyst comprising an active hydrosilating metal in elemental or compound form and a surface segregating metal in elemental or compound form on a support at a temperature range of about 0° C. to 350° C., the active hydrosilating metal being different from the surface segregating metal.
6 more elements
A hydrosilation process comprising:
- (A) contacting a silicon hydride described by formula R1aHbSiX4−a−b where each R1 is independently selected from the group consisting of alkyls comprising one to about 20 carbon atoms, cycloalkyls comprising about four to 12 carbon atoms, and aryls;
- each X is a halogen;
- a=0 to 3, b=1 to 3, and a+b=1 to 4;
- and
- (B) an unsaturated reactant selected from the group consisting of
- (i) substituted and unsubstituted unsaturated hydrocarbon compounds,
- (ii) silicon compounds comprising substituted or unsubstituted unsaturated hydrocarbon substituents, and
- (iii) mixtures of (i) and (ii);
- in the presence of a supported bimetallic catalyst comprising an active hydrosilating metal comprising platinum elemental or compound form and a surface segregating metal comprising copper, ruthenium, tin, or rhenium in elemental or compound form on a carbon support at a temperature range of about 80° C. to 190° C., the active hydrosilating metal being different from the surface segregating metal.
6 more elements
A hydrosilation process comprising:
- (A) contacting a silicon hydride described by formula R1aHbSiX4−a−b where each R1 is independently selected from the group consisting of alkyls comprising one to about 20 carbon atoms, cycloalkyls comprising about four to 12 carbon atoms, and aryls;
- each X is a halogen;
- a=0 to 3, b=1 to 3, and a+b=1 to 4;
- and a siloxanes described by formula
- R2mSiO(−R22SiO)n−(R22SiO)o−SiR2m,
- where R2 independently selected from the group consisting of hydrogen, alkyls comprising one to about 20 carbon atoms, cycloalkyls comprising about four to 12 carbon atoms and aryls;
- m=0 to 3, n=0 to 100 and o=0 to 100, and
- (B) an unsaturated reactant selected from the group consisting of
- (i) substituted and unsubstituted unsaturated hydrocarbon compounds,
- (ii) silicon compounds comprising substituted or unsubstituted unsaturated hydrocarbon substituents, and
- (iii) mixtures of (i) and (ii);
- in the presence of a supported bimetallic catalyst comprising an active hydrosilating metal in elemental or compound form and a surface segregating metal in elemental or compound form on a support at a temperature range of about 0° C. to 350° C., the active hydrosilating metal being different from the surface segregating metal.
9 more elements
Dependencies are inferred from the claim text.