Aliphatic polyester resin and method for producing same
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United States of America Patent
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Feb 3, 1998
Grant Date -
N/A
app pub date -
Aug 21, 1996
filing date -
Dec 21, 1994
priority date (Note) -
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Abstract
An aliphatic polyester resin having a .lambda. value representing the magnitude of non-linearity of elongational viscosity of 1.5 to 8.0, said .lambda. value being defined by the following formula (1): .lambda.=.lambda..sub.1 /.lambda..sub.0 ( 1) wherein .lambda..sub.0 denotes the elongational viscosity at the transition point and .lambda..sub.1 denotes the elongational viscosity when strain become twice that of a transition point, said transition point meaning a point between a linear region, i.e., the infinitesimal-deformation region, and a non-linear region, i.e., the large-deformation region. According to the present invention, an aliphatic polyester resin having excellent formability and forming stability as well as good biodegradability is provided.
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