Highly hygroscopic laminate

Details Highly hygroscopic laminate Highly hygroscopic laminate

1991-03-28

1992-09-01

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428138, 428192, 428194, 428198, 428280, 428281, 428282, 428283, 428286, 428287, 4283115, 4283117, 4283176, 4283179, B32B 310, B32B 516, B32B 518, B32B 704

Patent

active

051437732

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%.

REFERENCES:
patent: 4645698 (1987-02-01), Matsubara
patent: 4822669 (1989-04-01), Roga
patent: 4823783 (1989-04-01), Willhite, Jr. et al.
patent: 4824718 (1989-04-01), Hwang
patent: 4888231 (1989-12-01), Angstadt
patent: 4902565 (1990-02-01), Brook
patent: 5055332 (1991-10-01), Rhodes et al.

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