Title:
【発明の名称】高吸湿性積層体
Document Type and Number:
Japanese Patent JP2834266
Kind Code:
B2
Abstract:
A hygroscopic laminate comprises a hygroscopic layer comprising a gas permeable film, and a water-absorbing polymer and at least one humectant selected from the group consisting of acetic acid, propionic acid, glycolic acid, lactic acid, hydracrylic acid, pyruvic acid and pyrrolidonecarboxylic acid and sodium, potassium, calcium and magnesium salts of these acids, which are wrapped in the gas permeable film; a porous non-water retention sheet; and a water impermeable sheet, the porous non-water retention sheet being disposed on one side of the hygroscopic layer and the water impermeable sheet being disposed on the other side of the hygroscopic layer, to thereby sandwich the hygroscopic layer. The hygroscopic laminate controls the relative humidity in a packaged system to 20 to 40%.
Inventors:
TAKUNO MASAMI
Application Number:
JP8161390A
Publication Date:
December 09, 1998
Filing Date:
March 29, 1990
Export Citation:
Assignee:
SHOWA DENKO KK
International Classes:
B32B5/18; B32B7/02; B01J20/28; B65D81/26; (IPC1-7): B32B7/02; B01J20/28; B32B5/18
Domestic Patent References:
| JP1144374U | ||||
| JP1163123U | ||||
| JP58143232U |
Attorney, Agent or Firm:
Masatake Shiga (2 outside)