Patent ID: 6046250
Filing Date: 2000-04-04
Classification: C08G,C08K,C08L,Y10T

Abstract:
Radiation-curable composition comprising:(a) a polyorganohydrosiloxane having the general formula: ##STR14## wherein each R.sup.18 can be the same or different and represents an alkyl group, an cycloalkyl group, a phenyl group, or hydrogen, at least two but no more than one-half of all the R.sup.18 groups in the siloxane being hydrogen,m represents 0, 1, 2, 3, andn represents a number having an average value from one to about 3000,(b) a polyorganosiloxane having the general formula: ##STR15## wherein each R.sup.16 can be the same or different and represents a non-halogenated or halogenated ethylenically unsaturated group, a non-halogenated or halogenated alkyl group or cycloalkyl group, or the phenyl group, at least 70% of all R.sup.16 group being methyl groups, but no more than 10% of all R.sup.16 groups being vinyl or other alkenyl,h represents a number having a value from 1 to about 3000, andg represents 0, 1, 2, 3,(c) a platinum complex represented by the formula: ##STR16## wherein R.sup.1 represents an alkadiene that is .pi.-bonded to platinum, the alkadiene being a straight or branched chain group or a carbocyclic 6- to 8-membered ring, the alkadiene further being either unsubstituted or substituted with one or more groups that are inert in a hydrosilation reaction;R.sup.2 and R.sup.3 represent aryl radicals that are .sigma.-bonded to platinum and are independently selected from monocyclic and polycyclic aryl radicals, said aryl radicals being either unsubstituted or substituted with one or more groups that are inert in a hydrosilation reaction;R.sup.4 and R.sup.5 each independently represents hydrogen, an alkenyl radical, or a cycloalkenyl radical containing 5 or 6 ring carbon atoms, the unsaturated bond of the alkenyl or cycloalkenyl radical being in the 2- or 3-position with respect to the .sigma.-bonded position; anda represents zero or one, being zero only when both R.sup.4 and R.sup.5 are said alkenyl radicals and being one when either R.sup.4 or R.sup.5 is not said alkenyl radical, and(d) a free-radical photoinitiator that is capable of absorbing actinic radiation and having the general formula: ##STR17## wherein R.sup.6 represents an unsubstituted aryl group or an aryl group substituted with one or more groups that do not interfere with the hydrosilation reaction, R.sup.7, R.sup.8, and R.sup.9 each independently represents a member selected from the group consisting of unsubstituted aryl groups and aryl groups substituted with one or more groups that do not interfere with the hydrosilation reaction, aliphatic groups having from one to eighteen carbon atoms, and hydrogen.