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:
Oct. 21, 2008
Filed:
Jan. 18, 2008
Masaki Kato, Kurashiki, JP;
Kazuyuki Somemiya, Kurashiki, JP;
Takeshi Kusudou, Kurashiki, JP;
Naoki Fujiwara, Chiyoda-ku, JP;
Masaki Kato, Kurashiki, JP;
Kazuyuki Somemiya, Kurashiki, JP;
Takeshi Kusudou, Kurashiki, JP;
Naoki Fujiwara, Chiyoda-ku, JP;
Kuraray Co., Ltd., Kurashiki-shi, JP;
Abstract
The present invention provides a method for producing a polymer by conducting polymerization in a polymerization reactor having an inner wall covered with an anti-fouling agent comprising an aqueous solution containing a polyvinyl alcohol obtained through saponification of a polyvinyl ester that contains monomer units having a silyl group. In the present invention, the polyvinyl alcohol satisfies the following formulae (I) and (II):370<<9000   (I)where P indicates the viscosity-average degree of polymerization of the polyvinyl alcohol, and S indicates the content (mole %) of the monomer units having a silyl group of formula (1) in the polyvinyl alcohol;0.2/100≦()/()≦75/100   (II)where A indicates the content (ppm) of silicon atoms in the polyvinyl alcohol, and B indicates the content (ppm) of silicon atoms in the polyvinyl alcohol that was washed with sodium hydroxide-containing methanol and then washed with methanol by Soxhlet extraction.