Patent ID: 8420232

Claim:
A copolymer having Formula I: wherein: M is the same or different at each occurrence and is selected from the group consisting of an aromatic unit having triarylamine units and an aromatic unit having a crosslinkable substituent; and x, y and z are mole fractions such that x+y+z=1.0, with the proviso that x and y are not zero; wherein Binap is a 1,1′-binaphthyl group having a formula selected from the group consisting of Formula IIa, Formula IIc, Formula IId, and Formula IIe where: * represents a point of attachment to the other units in the compound; R 1 is the same or different at each occurrence and is selected from the group consisting of H, D, aryl groups, alkyl groups, silyl groups, siloxane groups, fluoroalkyl groups, alkoxy groups, and fluoroalkoxy groups, or the two R 1 groups may be joined together to form an aliphatic ring having 5-10 carbons; R 2 is the same or different at each occurrence and is selected from the group consisting of D, aryl groups, alkyl groups, silyl groups, siloxane groups, fluoroalkyl groups, alkoxy groups, and fluoroalkoxy groups; and a is the same or different at each occurrence and is an integer from 0-5; wherein Ar 1 is selected from the group consisting of phenylene, p-biphenylene, p-terphenylene, naphthylene, phenylenenaphthylene, naphthylenephenylene and a group having Formula III where: R 3 is the same or different at each occurrence and is selected from the group consisting of D, alkyl, alkoxy, siloxane and silyl; c is the same or different at each occurrence and is an integer from 0-4; and m is the same or different at each occurrence and is an integer from 1 to 6; wherein Ar 2 is selected from the group consisting of naphthyl and a group having Formula IV where: d is the same or different at each occurrence and is an integer from 0-5; and wherein Ar 3 is selected from the group consisting of naphthylene and a group having Formula III.