L-Dpolylactide copolymers with controlled morphology
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United States of America Patent
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Dec 14, 1993
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N/A
app pub date -
Dec 31, 1991
filing date -
Dec 31, 1991
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Abstract
Linear block copolymers are disclosed. The polymers comprise a plurality of alternating polymeric blocks of amorphous copolymers of L-lactide and D-lactide with semicrystalline blocks of either L-lactide homopolymer or D-lactide homopolymer. The molecular weight can be built up by either of two techniques. The first technique is to use a chain extending agent such as a diacyl chloride or a diisocyanate to link a plurality of the preformed block copolymers. The second technique is to polymerize additional alternating amorphous and semicrystalline onto the original alternating block copolymers.
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