POLYVINYLACETAL RESIN AND PROCESS FOR PRODUCING THE SAME

Title:

POLYVINYLACETAL RESIN AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2003/066690

Kind Code:

A1

Abstract:

A particulate polyvinylacetal resin of low metal content, being excellent in transparency, moisture resistance and electrical resistance, and having a large specific area, and a process for producing the same. A particulate polyvinylacetal resin of 60 mol% or more acetalization degree,1.50 to 3.50 m²/g specific surface area, 0.12 to 0.19 g/cm³ bulk density, 0.5 to 2.5 μm average particle diameter and 80 ppm or less metal content is obtained by reacting polyvinyl alcohol and an aldehyde in the presence of an acid catalyst. In particular, the particulate polyvinylacetal resin is produced for example, by feeding a reaction fluid containing polyvinyl alcohol, an aldehyde and an acid catalyst into a first reactor, carrying out an acetalization reaction until an acetalization degree of 10 to 60 mol%, discharging the reaction mixture, feeding the same into a second reactor and performing further reaction until the acetalization degree of polyvinylacetal resin is 65 mol% or higher.

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Inventors:

MASHIKO YOSHIHIRO (JP)
KAWANISHI TOSHIAKI (JP)
MATSUNAGA KOICHI (JP)
TSUZUKI MANABU (JP)
MATSUOTO KAZUMASA (JP)
GOTO KOKI (JP)
WATANABE HITOSHI (JP)

Application Number:

PCT/JP2003/001327

Publication Date:

August 14, 2003

Filing Date:

February 07, 2003

Export Citation:

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Assignee:

DENKI KAGAKU KOGYO KK (JP)
MASHIKO YOSHIHIRO (JP)
KAWANISHI TOSHIAKI (JP)
MATSUNAGA KOICHI (JP)
TSUZUKI MANABU (JP)
MATSUOTO KAZUMASA (JP)
GOTO KOKI (JP)
WATANABE HITOSHI (JP)

International Classes:

C08F8/28; C08F16/38; C09D129/14; (IPC1-7): C08F8/28; C08F6/00; C08F16/38; C08K5/00; C08L29/14

Foreign References:

JP2000336117A	2000-12-05
JPH0559117A	1993-03-09
JPH051108A	1993-01-08

Other References: