| 摘要 |
A process is provided for the condensation polymerizing lactic acid to a polymer with a weight average molecular weight of 2,500 to 4,500 containing less than 4% lactide and for a controlled release dosage form comprising a pharmaceutically active ingredient in a matrix of poly(lactic acid) and its copolymers with glycolic acid, valerolactone, epsilon -caprolactone, epsilon -decalactone, hydroxybutyric acid, beta -hydroxyvaleric acid and dioxanone.
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