Copolymers with polyester polycarbonate blocks containing poly(caprolactone) segments, and use thereof for the preparation of biodegradable matrices
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United States of America Patent
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Jun 29, 1999
Grant Date -
N/A
app pub date -
Feb 7, 1997
filing date -
Feb 8, 1996
priority date (Note) -
Expired
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Abstract
The invention relates to block copolymers of general formula (I) --?--O--CO--O--A--O--CO--O--B--!.sub.a -- (I) where a is an integer between 2 and 300 inclusive; A and B, which may be the same or different, are blocks which can be obtained by reaction between a bis(chloroformate) of oligomeric poly(caprolactone) and a polyester residue of formula (II) HO--?--R.sub.1 --CO--O!.sub.x --?--R.sub.2 --CO--O--!.sub.y --H (II) where R.sub.1 and R.sub.2, which may be the same or different, are each an aliphatic hydrocarbon residue with a linear or branched chain having from 1 to 4 carbon atoms; x and y are integers from 1 to 50, in any possible ratio from 0 to 1; the groups --R.sub.1 --COO-- and --R.sub.2 --COO-- being randomly distributed in the polyester residue.
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