Water-absorbing laminate and production process thereof

Details Water-absorbing laminate and production process thereof Water-absorbing laminate and production process thereof

1985-04-02

1986-07-29

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

47 17, 47 26, 47 28R, 156246, 428500, 428507, 428515, 428520, 428913, A01G 924, A01G 1302, D04H 164

Patent

active

046030778

ABSTRACT:
A water-absorbing laminate comprising a water-absorbing film and a non-woven fabric, in which the water-absorbing film is formed by film-forming a mixture of (A) a water-soluble polymer containing, as the monomer component, at least 40 mole % of an .alpha.,.beta.-unsaturated compound containing one or two carboxyl groups or groups from which a carboxyl group can be easily derived and in which 5% to 50% of the carboxyl groups and/or groups from which a carboxyl group can be easily derived are in the form of a salt, and (B) polyvinyl alcohol in a weight ratio of (A)/(B) of not less than 1/99 to less than 1/9. This water-absorbing can be produced by laminating the water-absorbing film on the non-woven fabric under pressure either in a hydrous and heat-softened state of the film or through an adhesive and, optionally, heat-treating the resultant laminate.
This water-absorbing laminate can avoid the formation of excessive moisture and prevent waterdrops from dropping while keeping the heat-retaining properties, when used as a sheet for a cover culture. As a result, the occurrence of disease in the plants under culture and any reduction in the yield and quality of the plants are effectively prevented.

REFERENCES:
patent: 3686024 (1972-08-01), Nankee
patent: 4387533 (1983-06-01), Green et al.
patent: 4406660 (1983-09-01), Beiner et al.
patent: 4413995 (1983-11-01), Korpman

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