Patent ID: 7435788

Claim:
A polymer consisting of two different blocks, wherein the blocks-comprise at least one L1 block and at least one L2 block and are selected from a) at least one L1 block with the formula and b) at least one L2 block with the formula wherein c) in the L1 blocks i) k are the same or different for each L1 block and ii) range from 6 to 460; and d) R groups i) are the same or different for each occurrence and ii) are 1-16 carbon (un)substituted, (un)branched alkyl, alkenyl, or alkynyl moieties, or 2-16 carbon (un)substituted, (un)branched diol or triol oligomers; e) in the L2 blocks i) j are the same or different for each L2 block and ii) range from 2 to 16; f) L1 is a linkage with the following formula i) wherein Y and Z are independently selected from the following moieties provided that if Y and Z are the same, they are not and wherein the symbol “•” indicates the position at which Y or Z attaches to the phenyl ring of L1; g)L2 is a linkage with the following formula ii) wherein Y and Z are independently selected from the following moieties provided that if Y and Z are the same, they are not and wherein the symbol “•” indicates the position at which Y or Z attaches to the phenyl ring of L2, wherein the weight average molecular weight of the polymer ranges from 38,000 to 188,000 Daltons.