Biodegradable polyester with improved molding characteristics and its production
First Claim
1. A method for preparing a biodegradable aliphatic polyester, which comprises polymerization of a precursor of the polyester in the presence of a polyesterification catalyst in an amount of from 0.0001% to 0.1% by weight, based on the weight of the precursor, and a co-catalyst comprising glycerol or butyrolactone in a weight proportion of not more than three times that of the catalyst.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a method for preparing a biodegradable aliphatic polyester, which comprises polymerization of a precursor of the polyester in the presence of a polyesterification catalyst in an amount of up to 0.1% by weight, based on the weight of the cyclic precursor, and a co-catalyst comprising glycerol or butyrolactone in a weight proportion of not more than three times that of the catalyst.
The invention also relates to the use of the resulting biodegradable aliphatic polyester in polymer processing, such as injection molding or compression/press molding.
-
Citations
17 Claims
- 1. A method for preparing a biodegradable aliphatic polyester, which comprises polymerization of a precursor of the polyester in the presence of a polyesterification catalyst in an amount of from 0.0001% to 0.1% by weight, based on the weight of the precursor, and a co-catalyst comprising glycerol or butyrolactone in a weight proportion of not more than three times that of the catalyst.
-
11. A catalyst composition for polymerization of a precursor of a biodegradable aliphatic polyester, comprising of a polyesterification catalyst and a co-catalyst comprising glycerol or butyrolactone in a weight proportion of not more than three times that of the catalyst.
-
13. In a method of polymerizing a precursor of a biodegradable aliphatic polyester catalyzed by a polyesterification catalyst, wherein the improvement comprises using glycerol or butyrolactone as a co-catalyst.
- 14. In a method of processing a polymer, wherein the improvement comprises using a biodegradable aliphatic polyester produced by a method which comprises polymerization of a precursor of the polyester in the presence of a polyesterification catalyst in an amount of from 0.0001% to 0.1% by weight, based on the weight of the precursor, and a co-catalyst comprising glycerol or butyrolactone in a weight proportion of not more than three times that of the catalyst.
Specification