C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
402/8, 204/91.38
C08J 3/28 (2006.01) C08G 77/00 (2006.01) C08K 5/00 (2006.01) C08L 83/04 (2006.01) C09D 183/04 (2006.01)
Patent
CA 2014996
43775 CAN 3A ABSTRACT OF THE DISCLOSURE 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. While there are catalyst systems that provide an alternative to ultraviolet initiated hydrosilation, several limitations of these systems can be cited. First, the systems require both a visible light absorbing sensitizer and a stable ultraviolet absorbing photohydrosilation catalyst, for example, an (n5-cyclopentadienyl)trialkylplatinum complex. Second, relatively high concentrations of the platinum catalyst, up to 1000 ppm platinum, are sometimes essential for rapid cure. Third, these systems have a limited depth of cure. Finally, these systems have only a moderately long shelf-life at room temperature. This invention provides a process for the actinic radiation-activated addition reaction of a compound containing silicon-bonded hydrogen with a compound containing aliphatic unsaturation, said addition being referred to as hydrosilation, comprising using, as a platinum hydrosilation catalyst, a complex represented by the formula: Image wherein R1 and R2 independently represent hydrogen, an alkyl group, or an aryl group, R3, R4, R5, and R6 independently represent an alkyl group, an aryl group, or an alkoxy group. The invention also provides novel compositions, capable of undergoing hydrosilation, containing the platinum complexes disclosed herein. An important application of the process and compositions of the invention is as a visible light curable impression material for dental applications.
Boardman Larry D.
Oxman Joel D.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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