Polymer modified cyanate mixture and epoxy resins thereof

Claim 1

A composition which comprises a mixture of (A) from about 0.5 to about 95 percent by weight (%bw) of total composition of a product resulting from copolymerizing (1) from about 0.1 to about 50, %bw of the combined weight of components (A-1) and (A-2) of at least one alkenylphenyl cyanate represented by the formula ##STR11## wherein Z is a ##STR12## group; each R, R 1 and R 2 is independently hydrogen or a hydrocarbyl group having from 1 to about 3 carbon atoms; each X is independently hydrogen, a hydrocarbyl or hydrocarbyloxy group having from 1 to about 4 carbon atoms, chlorine, bromine or a phenyl group; and x has a value of 4; and (2) from 50 to about 99.9 %bw of the combined weight of components (A-1) and (A-2) of at least one ethylenically unsaturated monomer; and (B) from about 5 to about 99.5 %bw of total composition of a mixed cyanate of a polyphenol prepared by the reaction of at least 0.01 but not more than 0.95, mole of a cyanogen halide or mixture of cyanogen halides per mole of aromatic hydroxyl groups in the presence of a suitable base in a quantity of from about 0.01 to about 1.0, mole per mole of aromatic hydroxyl groups with an aromatic polyphenol represented by the formulas ##STR13## wherein each A is independently a divalent hydrocarbon group having from 1 to about 12, carbon atoms, ##STR14## and the like; each A' is a divalent hydrocarbyl group having from 1 to about 3, carbon atoms or a ##STR15## group; each R' is independently hydrogen or a hydrocarbyl group having from 1 to about 6 carbon atoms or a halogen; n has a value of zero or 1; n' has a value from about 0.001 to about 6; n" has a value from about 1 to about 100; and p has a value of from zero to about 10.