Aliphatic polyester resin and a process for producing it
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United States of America Patent
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Feb 4, 2014
Grant Date -
Feb 14, 2013
app pub date -
Oct 4, 2012
filing date -
Jul 24, 2008
priority date (Note) -
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Abstract
The present invention is an aliphatic polyester resin in which a polyhydroxy acid skeleton is a main component, manufactured using a polymerization catalyst, characterized in that a specific organophosphorus compound is copolymerized in the resin. Activity of the polymerization catalyst contained in the aliphatic polyester resin of the present invention after the polymerization is well lowered and a lactide is hardly produced even by heating after the polymerization or after the manufacture.
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