The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 15, 2003
Filed:
Apr. 24, 2001
Applicant:
Inventor:
Jun Watanabe, Ohtake, JP;
Assignee:
Daicel Chemical Industries, Ltd., Sakai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 6/308 ; C08G 6/3183 ; C08L 6/703 ; C08L 6/704 ;
U.S. Cl.
CPC ...
C08G 6/308 ; C08G 6/3183 ; C08L 6/703 ; C08L 6/704 ;
Abstract
The invention provides methods for the preparation of polyester block copolymers, by reacting crystalline aromatic polyesters with lactones and/or epoxides. By using a slight excess of lactone in the reaction, and a subsequent solid-phase polycondensation reaction, the method generates high-molecular weight block copolymers of low crystallinity. Methods are also provided for generating polyester block copolymers by melt-mixing or kneading polyester block copolymers with epoxides in the solid phase.