Platinum/alkenylcyclohexene complexes useful for hydrosilylation catalysis
First Claim
1. A composition of matter comprising an organopolysiloxane curable by hydrosilylation with an organohydropolysiloxane, and a catalytically effective amount of a hydrosilylation catalyst which comprises a platinum/olefin complex, the olefin moiety thereof which comprises an alkenylcyclohexene having the ganeral formula:
- ##STR4## wherein R1 is an alkenyl radical having from 2 to 6 carbon atoms, and R2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.
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Abstract
Novel platinum/olefin complexes, useful for the hydrosilylation curing catalysis of hardenable organopolysiloxane compositions, are facilely prepared by reacting a platinum halide with at least one alkali or alkaline earth metal carbonate or bicarbonate in the presence of an alkenylcyclohexene ligand having the general formula: ##STR1## wherein R1 is an alkenyl radical having from 2 to 6 carbon atoms, and R2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.
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Citations
11 Claims
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1. A composition of matter comprising an organopolysiloxane curable by hydrosilylation with an organohydropolysiloxane, and a catalytically effective amount of a hydrosilylation catalyst which comprises a platinum/olefin complex, the olefin moiety thereof which comprises an alkenylcyclohexene having the ganeral formula:
- ##STR4## wherein R1 is an alkenyl radical having from 2 to 6 carbon atoms, and R2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.
- View Dependent Claims (2, 3, 4, 5)
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6. A process for the addition of at least one organopolysiloxane having alkylenically unsaturated groups to at least one organohydropolysiloxane having .tbd.SiH groups comprising mixing at least one organopolysiloxane having, per molecule, at least two alkylenically unsaturated groups bonded to a silicon atom with at least one organohydropolysiloxane having, per molecule, at least three .tbd.SiH groups and a catalytically effect amount of a hydrosilylation catalyst which comprises a platinum/olefin complex the olefin moiety thereof which comprises an alkenylcyclohexene having the general formula:
- ##STR5## wherein R1 is an alkenyl radical having from 2 to 6 carbon atoms, and R2 is a hydrogen atom or an inert organic radical, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.
- View Dependent Claims (7, 8, 9, 10, 11)
Specification