Visible radiation activated hydrosilation reaction
First Claim
1. A hydrosilation process which comprises reacting a composition comprising a compound having aliphatic unsaturation and a compound containing at least one silicon-bonded hydrogen atom and not having more than three hydrogen atoms attached to any one silicon atom, in the presence of both a (η
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5 -cyclopentadienyl)tri(σ
-aliphatic)platinum complex and a sensitizer that is capable of absorbing visible light and that is capable of transferring energy to said platinum complex such that the hydrosilation reaction is initiated upon exposure to visible light.
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Abstract
A process for the addition of compounds containing silicon-bonded hydrogen to compounds containing aliphatic unsaturation and compositions suitable for said process. The process is activated by visible radiation and is conducted in the presence of a platinum complex having one cyclopentadienyl group that is eta-bonded to the platinum atom and three aliphatic groups that are sigma-bonded to the platinum atom and a sensitizer that is capable of absorbing visible light and is capable of transferring energy to said platinum complex such that the hydrosilation reaction is initiated upon exposure to visible light. The invention also provides for use in the aforementioned process.
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Citations
27 Claims
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1. A hydrosilation process which comprises reacting a composition comprising a compound having aliphatic unsaturation and a compound containing at least one silicon-bonded hydrogen atom and not having more than three hydrogen atoms attached to any one silicon atom, in the presence of both a (η
-
5 -cyclopentadienyl)tri(σ
-aliphatic)platinum complex and a sensitizer that is capable of absorbing visible light and that is capable of transferring energy to said platinum complex such that the hydrosilation reaction is initiated upon exposure to visible light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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5 -cyclopentadienyl)tri(σ
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16. A radiation-curable composition comprising:
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(a) a silicon compound containing at least one hydrogen atom attached to silicon per molecule, there being not more than three hydrogen atoms attached to any one silicon atom, (b) a compound containing aliphatic unsaturation, (c) a (η
5 -cyclopentadienyl)tri(σ
-aliphatic)platinum complex, and(d) a sensitizer that is capable of absorbing visible light and that is capable of transferring energy to said platinum complex when said composition is exposed to visible light. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. Radiation-curable composition comprising
(a) a polyorganohydrosiloxane having the general formula: - ##STR16## wherein each R8 independently represents a member selected from the group consisting of alkyl groups, cycloalkyl groups, phenyl group, and hydrogen, provided that at least two but no more than one-half of all the R8 groups in the siloxane are hydrogen;
m is 0, 1, 2 or 3, and n is a number having an average value from one to about 3000, (b) a polyorganosiloxane having the general formula;
##STR17## wherein each R6 independently represents a member selected from the group consisting of non-halogenated or halogenated ethylenically unsaturated groups, non-halogenated or halogenated alkyl groups, non-halogenated or halogenated cycloalkyl groups, and the phenyl group, provided that at least 70% of all R6 groups are methyl groups, but no more than 10% of all R6 groups are vinyl groups or other alkenyl groups, further provided that at least two of the R6 groups are vinyl groups or other alkenyl groups,h is a number having a value from 1 to about 3000, and g is 0, 1, 2, or 3, (c) a platinum complex represented by the formula;
##STR18## wherein Cp represents a cyclopentadienyl group that is eta-bonded to the platinum atom, the cyclopentadienyl group being unsubstituted or substituted by one of more groups that are inert in a hydrosilation reaction, andeach of R1, R2, and R3 represents an aliphatic group having from one to eighteen carbon atoms, said R1, R2, and R3 groups being sigma-bonded to the platinum atom, and (d) a sensitizer that is capable of absorbing visible light and that is capable of transferring energy to said platinum complex when said composition is exposed to visible light.
- ##STR16## wherein each R8 independently represents a member selected from the group consisting of alkyl groups, cycloalkyl groups, phenyl group, and hydrogen, provided that at least two but no more than one-half of all the R8 groups in the siloxane are hydrogen;
Specification