Title:
METHOD OF CHANGING WATER CONTENT OF WATER ABSORBING OR WATER DISCHARGING MATERIAL
Document Type and Number:
Japanese Patent JPS57110322
Kind Code:
A
Abstract:
The water content of a material, which tends to either absorb water or to release water, is changed with the aid of a film, which at least partially separates the material from the adjacent space and is impermeable to liquid water but permeable to gaseous water. Polyvinyl alcohol with a particular degree of polymerization and degree of hydrolysis is used as the film material. The film can be mechanically or chemically after-treated. The moistening or de-moistening of the material, which is solid, liquid or gaseous, is effected, utilizing a water vapor pressure gradient, under very mild conditions.
Inventors:
UORUFUGANGU TSUIMERUMAN
ARUBUREHITO HARUREUSU
RIHIARUTO GUTSUTE
ARUBUREHITO HARUREUSU
RIHIARUTO GUTSUTE
Application Number:
JP16355381A
Publication Date:
July 09, 1982
Filing Date:
October 15, 1981
Export Citation:
Assignee:
HOECHST AG
International Classes:
A01F25/13; A23F3/22; A23F5/28; A23L3/00; A23L3/3418; A23L27/14; A24B1/02; B01D53/22; A61K36/00; A61L15/24; B01D53/26; B01D61/00; B01D67/00; B01D71/38; B32B7/02; B32B27/12; B32B27/30; B32B33/00; B65D65/00; B65D65/38; C08L29/00; C08L29/02; D06M15/333; D06N3/04; F24F6/00; F26B5/00; A61G15/00; (IPC1-7): B01D13/00; B01D53/22; B01D53/26; B32B27/30; B65D65/00; C08F16/06; D06N3/00
Domestic Patent References:
| JPS5181938U | 1976-06-30 | |||
| JPS4414201Y1 | 1969-06-16 |
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