Aromatic cyanate-siloxane

A compound containing an average of more than one aromatic cyanate group and at least one organosiloxane moiety per molecule represented by the following general formulas I, II, III, or IV ##STR10## wherein each R' is independently a hydrocarbyl group having from 1 to about 20 carbon atoms;

• each Y is a hydrocarbyl group having from 2 to about 20 carbon atoms or an entity represented by the following formulas V, VI, VII, VIII, IX, X, or XI with the proviso that at least an average of more than one Y is other than a hydrocarbyl group:
• ##STR11## wherein each A is independently a divalent hydrocarbyl group having from 1 to about 20 carbon atoms, --O--, --S--, --S--S--, --SO--, --SO.sub.2 --, or --CO--;
• each A' is independently a divalent hydrocarbyl group having from 1 to about 20 carbon atoms;
• each Q is independently hydrogen or an alkyl group having from 1 to 10 carbon atoms;
• each Q' is independently a tetravalent hydrocarbyl group having from 1 to about 20 carbon atoms;
• each R is independently hydrogen or an alkyl group having from 1 to about 3 carbon atoms;
• each X is independently hydrogen, a hydrocarbyl or hydrocarbyloxy group having from 1 to about 12 carbon atoms, a halogen atom, or a hydroxyl group;
• each X' is independently hydrogen or an unsaturated aliphatic or unsaturated cycloaliphatic group or such unsaturated aliphatic or unsaturated cycloaliphatic group having an oxygen atom between such group and the aromatic ring;
• each X" is independently a divalent aliphatic or a divalent cycloaliphatic group;
• each m independently has an average value from about 0.01 to about 8;
• each m' independently has an average value from about zero to about 8;
• each n independently has a value of zero or 1;
• each n' independently has an average value from about 0.001 to about 20;
• each n independently has a value from 1 to about 3;
• each p independently has a value from zero to about 10;
• each p' independently has an average value from zero to about 8;
• and each s, t and u independently has a value from 1 to about 3 with the proviso that the sum of s, t and u satisfies the valency of the ring;
• each x independently has a value from zero to about 500;
• each x' independently has a value from 2 to about 500;
• each x" independently has a value from 2 to about 10;
• and the sum of x and x' is from about 2 to about 1000.