Crosslinked hydrogel copolymers
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United States of America Patent
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Oct 5, 2004
Grant Date -
Apr 22, 2004
app pub date -
Oct 18, 2002
filing date -
Oct 18, 2002
priority date (Note) -
Expired
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Abstract
The present invention relates to crosslinked polymers, synthesized through ring-opening polymerization of ethylenically unsaturated epoxides, in combination with .alpha.-hydroxy acids using a hydrophilic macroinitiator, such as poly(ethylene glycol), to form substituted copolymers having ethylenically unsaturated functionality randomly distributed along the polyester polymer backbone. That copolymer is subsequently crosslinked to form a hydrogel network. More particularly, the present invention relates to the synthesis of biodegradable poly(.alpha.-hydroxy acid-co-glycidyl methacrylate)-block-poly(ethylene glycol)-block-poly(.alpha.-hydroxy acid-co-glycidyl methacrylate) copolymers, which are subsequently crosslinked to form hydrogel networks. The invention also relates to the use of these hydrogel networks in various applications, in particular, for the controlled release of drugs and proteins.
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