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:
May. 18, 1999
Filed:
Jun. 25, 1997
Applicant:
Inventors:
Kazuyuki Hanada, Tokyo, JP;
Katsumi Kuriyama, Tokyo, JP;
Assignees:
Dainichiseika Color & Chemicals Mfg.Co., Ltd, Tokyo, JP;
Ukima Colour & Chemicals Mfg. Co., Ltd, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09D / ;
U.S. Cl.
CPC ...
428207 ; 428480 ; 428481 ; 428483 ; 428511 ; 428514 ; 428520 ; 428 366 ; 525 58 ; 525 61 ;
Abstract
A PVA-base copolymer is obtained by subjecting a lactone, whose ring is formed of 3 to 10 carbon atoms, to ring-opening polymerization in the presence of polyvinyl alcohol (PVA). The copolymer comprises a PVA chain and an aliphatic polyester grafted as a ring-opened polymer of the lactone on the PVA chain. Further, the copolymer has a PVA content of 2 to 98 wt. %, a polyester content of 98 to 2 wt. %, and a number average molecular weight of 10,000 to 500,000.