Patent ID: 8399576

Claim:
A phosphorous containing phenol novolac resin, having a structure as below: wherein: Z is selected from — or —CH 2 —; and each Y is independently selected from —, —CH 2 —, —C(CH 3 ) 2 —, —S—, —SO 2 —, —O—, —CO—, or —N═N—; and each X is independently selected from a hydrogen or phosphorous containing group, wherein the hydrogen and phosphorous containing group have a molar ratio of 1:0.1 to 0.1:1, and the phosphorous containing group has a structure as below: wherein: each R 1 is independently selected from a hydrogen or C 1-5 alkyl group, each R 2 is independently selected from a C 1-5 alkyl group; m is an integer of 1 to 10; and n is 0 or 1.