C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
260/442, 400/530
C07F 7/18 (2006.01) C07F 15/00 (2006.01) C08L 83/04 (2006.01)
Patent
CA 1231960
FN 33415CAN7A ABSTRACT This invention relates to a hydrosilation process involving the reaction of a compound containing silicon- bonded hydrogen with a compound containing aliphatic unsaturation in the presence of actinic radiation, and to compositions which contain an actinic radiation-sensitive catalyst that are useful in said process. Numerous patents teach the use of various complexes of cobalt, rhodium, or platinum as catalysts for accelerating the thermally-activated addition reaction (hydrosilation) between a compound containing silicon- bonded hydrogen and a compound containing aliphatic unsaturation. However, processes for accelerating the ultraviolet radiation activated addition reactions between these compounds are rare. This invention involves a process for the actinic radiation-activated addition reaction of a compound contain- ing silicon-bonded hydrogen with a compound containing aliphatic unsaturation, (hydrosilation), the improvement comprising using, as a platinum hydrosilation catalyst, an (?-cyclopentadienyl)tri(.sigma.-aliphatic)platinum complex. The invention further involves novel compositions, capable of undergoing hydrosilation, containing the aforementioned platinum complex. Advantages of the platinum complex in accelerating the radiation-activated hydrosilation process include: (1) the reaction composition will not react prematurely or readily in the absence of actinic radiation; (2) since heat is not required, the addition reaction can be carried out on the surface of a heat-sensitive substrate without adversely affecting the substrate; and (3) radiation curing consumes less energy than does thermal curing.
466663
Minnesota Mining And Manufacturing Company
Smart & Biggar
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