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:
Aug. 17, 2010
Filed:
Jul. 13, 2007
Mamoru Mizumoto, Hitachinaka, JP;
Toshiaki Matsuo, Hitachi, JP;
Takayuki Matsumoto, Hitachi, JP;
Naruyasu Okamoto, Tokyo, JP;
Ryuuji Kajiya, Yokohama, JP;
Mamoru Mizumoto, Hitachinaka, JP;
Toshiaki Matsuo, Hitachi, JP;
Takayuki Matsumoto, Hitachi, JP;
Naruyasu Okamoto, Tokyo, JP;
Ryuuji Kajiya, Yokohama, JP;
Hitachi Plant Technologies, Ltd., Tokyo, JP;
Abstract
A polymerization method comprises, prior to polymerization of a monomer of the cyclic dimer of alpha-hydroxycarboxylic acid, a first mixture of a polymerization catalyst by bypassing a part of the monomer of the cyclic dimer is prepared. Then, the first mixture is mixed with a dominant amount of the monomer introduced into a polymerization reactor. The monomer of the cyclic dimer in the polymerization reactor is conducted in the presence of a polymerization initiator.