Process for polymerizing poly(lactic acid)
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United States of America Patent
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Dec 24, 1991
Issued Date -
N/A
app pub date -
Nov 30, 1990
filing date -
Apr 2, 1990
priority date (Note) -
Expired
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Abstract
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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