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. 29, 2006
Filed:
Apr. 15, 2004
Hirotoshi Mizota, Hiroshima, JP;
Tomonari Murakami, Hiroshima, JP;
Yoshihiro Uozu, Hiroshima, JP;
Shigeaki Sasaki, Toyama, JP;
Koji Ishizaka, Toyama, JP;
Takeshi Kitayama, Toyama, JP;
Tatsuyuki Takayanagi, Toyama, JP;
Jun-ichiro Atarashi, Toyama, JP;
Yasukazu Yoshida, Hiroshima, JP;
Masaharu Yanai, Hiroshima, JP;
Motomu Oh-kita, Hiroshima, JP;
Hirotoshi Mizota, Hiroshima, JP;
Tomonari Murakami, Hiroshima, JP;
Yoshihiro Uozu, Hiroshima, JP;
Shigeaki Sasaki, Toyama, JP;
Koji Ishizaka, Toyama, JP;
Takeshi Kitayama, Toyama, JP;
Tatsuyuki Takayanagi, Toyama, JP;
Jun-ichiro Atarashi, Toyama, JP;
Yasukazu Yoshida, Hiroshima, JP;
Masaharu Yanai, Hiroshima, JP;
Motomu Oh-Kita, Hiroshima, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
This invention provides a process for manufacturing a methyl methacrylate polymer comprising the steps of feeding a monomer containing at least 80 wt % of methyl methacrylate and a radical polymerization initiator represented formula (III) to a reactor; polymerizing the material at a polymerization temperature of 110 to 160° C. under the conditions satisfying particular equations between an initiator concentration and a polymerization temperature; feeding a reaction mixture taken out from the reactor to a devolatilization step (feeding step); and separating and removing volatiles from the reaction mixture (devolatilization step). A methyl methacrylate polymer having adequately good optical properties and a plastic optical fiber having improved transmission performance can be prepared according to this invention