Cyanate-containing polymers

A composition which comprises

• (A) from about 1 to 100 percent by weight (pbw) of a cyanate-containing polymer or mixture of cyanate-containing polymers represented by the formula:
• ##STR7## wherein each R, R' and R" is independently hydrogen or an alkyl group having from 1 to about 4 carbon atoms;
• each X is independently an alkyl group having from 1 to about 4 carbon atoms, chlorine or bromine;
• Q is independently a group derived from any suitable polymerization initiator or terminator, ##STR8## wherein each aromatic ring may contain any substituent group as those enumerated in formula I and each R, R' and R" is defined as in formula I;
• n has a value from about 5 to about 100;
• n' has a value from zero to about 99;
• and each x independently has a value from zero to 4;
• and
• (B) from zero to about 99 pbw of an aromatic polycyanate or mixture of aromatic polycyanates represented by the formula:
• ##STR9## wherein each Z is independently H-, an alkyl group having from 1 to about 4 carbon atoms, chlorine or bromine;
• A is a direct bond, a hydrocarbyl group having from 1 to about 10 carbon atoms, --S--, --S--S--, --O--, ##STR10## y has a value from zero to 5 when n" has a value of 1;
• y has a value from 2 to 5 when n" has a value of zero;
• x' has a value of 5 minus the value of y when n" has a value of 1;
• x' has a value of 6 minus the values of y plus y" when n" has a value of zero;
• x" has a value of 5 minus the value of y";
• y" has a value of zero to 5;
• n" has a value of zero to 3;
• with the proviso that the sum of y and y" is always at least two;
• and
• (C) from zero to about 99 pbw of an epoxy resin or mixture of epoxy resins represented by the formulas:
• ##STR11## wherein R, X, Z, n', and x are as defined above;
• m' has a value of 0.01 to about 10, and each A is independently a hydrocarbyl group having from 1 to about 10 carbon atoms, --S--, --S--S--, --O--, ##STR12## each A' is independently a hydrocarbyl group having from 1 to about 10 carbon atoms;
• each m has a value of zero or 1;
• wherein the pbw of the individual components is based upon the total weight of components A, B and C.