Copolymers of monocyclic esters and carbonates and methods for making same
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United States of America Patent
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Mar 21, 2006
Grant Date -
Jun 24, 2004
app pub date -
Dec 1, 2003
filing date -
Jun 8, 2001
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Abstract
Copolymers having repeating units derived from monocyclic esters or carbonates and certain bicyclic diesters and/or carbonates have controllable rheological properties. The bicyclic diester and/or carbonate copolymerizes easily with the monocyclic monomers, especially with lactide, to form copolymer that can have tailored levels of branching. The copolymers have excellent rheological properties, including increased melt tensions and improved shear thinning, compared to the analogous linear polymers.
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