L,d-polylactide copolymers with controlled morphology
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United States of America Patent
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Sep 13, 1994
Issued Date -
N/A
app pub date -
Oct 26, 1993
filing date -
Dec 31, 1991
priority date (Note) -
Expired
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Abstract
Linear stereo 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 segments or blocks onto the original alternating block copolymers.
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