Patent ID: 7214759

Claim:
A composition comprising a polymer represented by a formula: where R 1 and R 3 are different from each other and each comprises a component independently selected from a group consisting of a chemical bond, substituted, unsubstituted, hetero-, straight-chained, branched, cyclic, saturated and unsaturated aliphatic radicals; and substituted, unsubstituted, and hetero- aromatic radicals; R 2 and R 4 each comprises a component independently selected from a group consisting of substituted, unsubstituted, hetero-, straight-chained, branched, cyclic, saturated and unsaturated aliphatic radicals; and substituted, unsubstituted, and hetero- aromatic radicals; the grouping is derived from polyacid HOOC—R 1 —COOH and diol HO—R 2 —OH; the grouping is derived from polyacid HOOC—R 3 —COOH and diol HO—R 4 —OH; R 1 and R 3 are selected so that polyacid HOOC—R 1 —COOH and polyacid HOOC—R 3 —COOH independently have two more carboxylic acid groups; polyacid HOOC—R 1 —COOH or polyacid HOOC—R 3 —COOH is an aliphatic dicarboxylic acid selected from the group consisting of oxalic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecandioic acid, tridecanedioic acid, tetradecanedioic acid, petadecanedioic acid, hexadecanedioic acid, citric acid, maleic acid, fumaric acid or combinations thereof; L 1 is an optional linkage; X is an optional agent; L 2 is an optional linkage connecting X to the polymer; and m and n are integers not equal to 0.