Title:
PREPARATION METHOD OF POLYVINYL ALCOHOL RICH IN SYNDIOTACTICITY
Document Type and Number:
Japanese Patent JP2001200008
Kind Code:
A
Abstract:
To provide a preparation method of a polyvinyl alcohol rich in syndiotacticity from a vinyl ester such as vinyl acetate by a low-cost process.
The preparation method of the polyvinyl alcohol containing syndiotacticity (diad) of ≥55% comprises polymerizing the vinyl ester in the presence of a metal Lewis acid represented by the formula (I): R1R2R3MIII (wherein the center metal MIII is Al or B; R1, R2 and R3 are each a 1-12C alkyl group, a 1-12C alkoxy group, a 3-12C alkylsilyloxy group, of an aryloxy group whose part may be substituted, any combinations thereof being used) or by the formula (II): MIIX1X2 (wherein the center metal MII is Zn or Mg; X1 and X2 are each a halogen atom), and then saponifying the resulting products.
Inventors:
OKAMOTO YOSHIO
NAKANO TAMAKI
SAWAMOTO MITSUO
UEGAKITO MASAMI
NAGATA NAOHIKO
NAGARA YOSHITAKA
YAMADA KAZUNOBU
TERADA KAZUTOSHI
OTAKE TOMIAKI
KANESAKA JUNICHIRO
OKI YASUYOSHI
OKANO YOSHIMICHI
NISHIMURA MASAMICHI
NAKANO TAMAKI
SAWAMOTO MITSUO
UEGAKITO MASAMI
NAGATA NAOHIKO
NAGARA YOSHITAKA
YAMADA KAZUNOBU
TERADA KAZUTOSHI
OTAKE TOMIAKI
KANESAKA JUNICHIRO
OKI YASUYOSHI
OKANO YOSHIMICHI
NISHIMURA MASAMICHI
Application Number:
JP2000006739A
Publication Date:
July 24, 2001
Filing Date:
January 14, 2000
Export Citation:
Assignee:
JAPAN CHEMICAL INNOVATION INST
International Classes:
C08F4/12; C08F8/12; C08F18/04; C08F18/08; (IPC1-7): C08F4/12; C08F8/12; C08F18/04; C08F18/08
Attorney, Agent or Firm:
Toshio Nishizawa
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