Title:
PRODUCTION OF POLYVINYL ACETAL-BASED SPONGE
Document Type and Number:
Japanese Patent JPH02263838
Kind Code:
A
Abstract:
PURPOSE:To harden bubbles in forming a sponge in a short time and obtain the subject sponge of a homogenous cell construction by adding an aldehyde and an acid to a sponge-formed solution, applying Joule's heat, accelerating heating from the interior thereof and homogeneously carrying out acetalizing reaction. CONSTITUTION:The objective sponge obtained by mechanically expanding an aqueous solution of polyvinyl alcohol in the presence of a surfactant, then adding an aldehyde and an acid thereto, preparing a sponge-formed solution, mounting a pair of electrode plates in the above-mentioned forming solution, passing, e.g. electricity at 10-100V voltage therethrough for 1-60min, further passing electricity at 1-20V therethrough for 10-120min, homogeneously heating the aforementioned formed solution and carrying out acetalization reaction.
Inventors:
NAKAMURA SHINYA
SHIBATA TOMOYOSHI
NAKAGAWA YOSHIFUMI
SHIBATA TOMOYOSHI
NAKAGAWA YOSHIFUMI
Application Number:
JP8456589A
Publication Date:
October 26, 1990
Filing Date:
April 03, 1989
Export Citation:
Assignee:
SANWA KAKO CO
International Classes:
C08J9/00; C08F8/28; (IPC1-7): C08J9/00
Domestic Patent References:
| JPS5887133A | 1983-05-24 | |||
| JP45041112A | ||||
| JPS4943112A | 1974-04-23 | |||
| JP33003191A | ||||
| JPS4920271A | 1974-02-22 | |||
| JPS4963755A | 1974-06-20 | |||
| JPS4964656A | 1974-06-22 |
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