An aliphatic polyester resin and a process for producing it
OwnerTomokazu Kusunoki, Toshifumi Unrinin +1inventors
InventorsTomokazu Kusunoki, Toshifumi Unrinin, Osamu Morimoto
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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.
Claims12
An aliphatic polyester resin in which a polyhydroxy acid skeleton is a main component, manufactured using a polymerization catalyst, characterized in that an organophosphorus compound represented by the formula [I] is copolymerized in the resin.
- In the formula, R1, R2, R3 and R4 are same or different and each of them is hydrogen or alkyl group;
- and n is an integer of 1 or more.
A process for producing an aliphatic polyester resin where a polyhydroxy acid skeleton is a main component by means of a ring-opening polymerization reaction in the presence of a polymerization catalyst, characterized in that an organophosphorus compound represented by the formula [I] is added to the reaction system to lower the activity of the polymerization catalyst.
- In the formula, R1, R2, R3 and R4 are same or different and each of them is hydrogen or alkyl group;
- and n is an integer of 1 or more.
Dependencies are inferred from the claim text.