Patent ID: 7956350

Claim:
A compound of the formula: wherein R 1 is independently in each occurrence i) a C 1-40 hydrocarbyl group, ii) a C 1-40 hydrocarbyl group wherein one or more carbons are substituted by one or more heteroatoms selected from S, N, O, P, B or Si atoms, or iii) a halogenated derivative of i) or ii), with the proviso that in at least one occurrence, R 1 is crosslinkable group, and wherein R 1 in at least one occurrence is selected from the group consisting of —(R 5 ) m —CR 4 ═CR 4 2 , —(R 5 ) m —CR 4 ≡CR 4 , —(R 5 ) m —O(R 5 ) m CR 4 ═CR 4 2 , —(R 5 ) m —O(R 5 ) m C≡CR 4 , —(R 5 ) m —C(O)(R 5 ) m CR 4 ═CR 4 2 , —(R 5 ) m —C(O)(R 5 ) m C≡CR 4 , —(R 5 ) m —OC(O)(R 5 ) m C≡CR 4 , —(R 5 ) m —COO(R 5 ) m CR 4 ═CR 4 2 , —(R 5 ) m —COO(R 5 ) m C≡CR 4 , —(R 5 ) m O(CO)O(R 5 ) m CR 4 ═CR 4 2 , —(R 5 ) m —O(CO)O(R 5 ) m C≡CR 4 , where R 4 is hydrogen, halogen, C 1-20 hydrocarbyl, C 1-20 halohydrocarbyl, or C 1-20 halocarbyl; R 5 is C 1-20 hydrocarbylene, C 1-20 halohydrocarbylene, or C 1-20 halocarbylene; and m is 0 or 1; R 2 is independently in each occurrence hydrogen, halogen, C 1-20 hydrocarbyl, C 1-20 hydrocarbyloxy, C 1-20 thioether, C 1-20 hydrocarbylcarbonyloxy, di(C 1-20 hydrocarbyl)amino, or cyano; Ar 1 , Ar 21 , Ar 3 and Ar 4 are independently in each occurrence C 6-20 aromatic groups, optionally containing one or more S, N, O, P, B or Si heteroatoms, or a halo-, C 1-20 hydrocarbyl-, di(C 1-20 hydrocarbyl)amino-, C 1-20 hydrocarbyloxy-, tri(C 1-10 hydrocarbyl)silyl-, or tri(C 1-10 hydrocarbyl)siloxy-substituted derivative thereof; a and b independently in each occurrence are 0 or 1; and X 1 and X 2 independently in each occurrence are a covalent bond, O, S, SO 2 , CH 2 , C(R 3 ) 2 or NR 3 , wherein R 3 is selected from the group consisting of C 1-22 alkyl, C 1-22 cycloalkyl, C 6-24 aryl, and C 7-24 aralkyl.