Siloxane-Based Composition and Cured Product Thereof, and Use Therefor

A composition comprising at least one kind of metal compound selected from the group consisting of a platinum compound, a palladium compound and a rhodium compound, and a siloxane compound (A) represented by general formula (1):

• wherein X is mutually independently a group represented by general formula X1 or X2:
• wherein the number of X1 (α) is an integer of 1-8;
• the number of X2 (β) is an integer of 0-7;
• the sum of α and β is 8;
• R1 to R4 mutually independently represent a hydrogen atom, a C1-8 alkyl group, alkenyl group, alkynyl group, or a C6-8 aryl group, a hydrogen atom in these hydrocarbon groups being optionally substituted by a fluorine atom;
• R5 mutually independently represents a C1-18 alkyl group, alkenyl group, alkynyl group or aryl group, a hydrogen atom in these hydrocarbon groups being optionally substituted by a fluorine atom, and a carbon atom being optionally substituted by an oxygen atom or a nitrogen atom;
• R6 mutually independently represents a hydrogen atom, a vinyl group or an allyl group;
• m and n mutually independently represent an integer of 1-4;
• and
• 3≦m+n.