Patent ID: 7166680

Claim:
A poly(ester amide) (PEA) polymer blend having a glass transition temperature (T g ) above the T g of poly(ester amide benzyl ester) (PEA-Bz) or poly {[N,N′-sebacoyl-bis-(L-leucine)-1,6-hexylene diester]-[N,N′-sebacoyl-L-lysine 2,2,6,6-tetramethyl-4-amino-1-piperidinyloxyl amide]} (PEA-TEMPO), comprising: a first PEA polymer having a T g equal to or below the T g of PEA-Bz or T g of PEA-TEMPO, and a second PEA polymer having a T g above the T g of PEA-Bz or T g of PEA-TEMPO, the PEA polymer blend comprising a PEA polymer of any of formulae 3–7: -[-sebacinate-L-Leu-hexanediol-L-Leu-] n - Formula 3 -[-adipate-L-Leu-hexanediol-L-Leu-] n - Formula 4A -[-sebacinate-L-Leu-butanediol-L-Leu-] n - Formula 4B -[-adipate-L-Leu-butanediol-L-Leu-] n - Formula 4C -[-sebacinate-L-Val-hexanediol-L-Val-] n - Formula 5A -[-sebacinate-L-Phe-hexanediol-L-Phe-] n - Formula 5B -[-adipate-L-Val-butanediol-L-Val-] n - Formula 5C -[-adipate-L-Phe-butanediol-L-Phe-] n - Formula 5D -[-adipate-L-Leu-hexanediol-L-Leu-] m -[-adipate-Lys-R] n -R=benzyl ester or TEMPO Formula 6A -[-sebacinate-L-Leu-butanediol-L-Leu-] m -[-sebacinate-Lys-R] n -R=benzyl ester or TEMPO Formula 6B -[-adipate-L-Leu-butanediol-L-Leu-] m -[-adipate-Lys-R] n -R=benzyl ester or TEMPO Formula 6C -[-sebacinate-L-Val-hexanediol-L-Val-] m -[-sebacinate-Lys-R] n -R=benzyl ester or TEMPO Formula 6D -[-sebacinate-L-Phe-hexanediol-L-Phe-] m -[sebacinate-Lys-R] n -R=benzyl ester or TEMPO Formula 6E -[-adipate-L-Val-butanediol-L-Val-] m -[-adipate-Lys-R] n -R=benzyl ester or TEMPO Formula 6F -[-adipate-L-Phe-butanediol-L-Phe-] m -[-adipate-Lys-R] n -R=benzyl ester or TEMPO Formula 6G -[-sebacinate-L-Leu-hexanediol-L-Leu-] m -[-sebacinate-Lys R] n -R=methyl, ethyl, or propyl Formula 7, wherein m and n are independent positive integers ranging from 1 to 100,000.