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:
Feb. 18, 2003
Filed:
Oct. 14, 2000
Yoshihiro Maeda, Toride, JP;
Shigeru Yamaguchi, Yao, JP;
Shorbu Shioji, Himeji, JP;
Kaoru Iwasaki, Ibo-gun, JP;
Nippon Shokubai Co., Ltd, Osaka, JP;
Abstract
The present invention provides: a production process that enables to keep foaming state within a constant level and to obtain a polymer with good productivity and reproducibility with a practical plant by defining an appropriate vapor velocity from a weight-average molecular weight of the polymer that is finally intended to obtain; and a polymerization apparatus therefor. A production apparatus for producing a polymer, which comprises a reactor in order to produce the polymer, a stirrer in order to stir a reaction solution in the reactor , and a condenser so that a vaporized reaction solution can be cooled and returned to the reactor , and further comprises a vapor velocity measuring means of monitoring a vapor velocity in the condenser, and an vapor velocity adjusting means of adjusting the vapor velocity, is used. Then, the vapor velocity is adjusted in the range of 0.001 to 0.05 m/s so that a common logarithm value of a weight-average molecular weight of the polymer that is finally intended to obtain multiplied by the value of the vapor velocity can be not more than 0.15 for not less than 10% of the whole reaction time.