Process for producing a water-absorbing sheet material and the u

Details Process for producing a water-absorbing sheet material and the u Process for producing a water-absorbing sheet material and the u

1995-05-31

1996-10-22

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

427369, 4273899, 427394, 427421, B05D 102

Patent

active

055674780

ABSTRACT:
The present invention relates to a process for producing water-absorbing sheet-like materials which consist of a water-absorbent polymer and a prefabricated nonwoven fabric, wherein the prefabricated nonwoven fabric is impregnated with a solution comprising partially neutralized acrylic acid and at least one cross-linking agent and is squeezed to a certain coating amount, and the monomer solution thus applied is characterized in that the polymerization is carried out in the presence of radical initiators which cannot be activated thermally and at least one thermally activatable radical former used in addition. The additional use of a thermally activatable radical former in the polymerization results in products having a low residual monomer content, an improved water absorption under load, and a higher retention, with a production method being employed which is technically simple and economically efficient at the same time. The thermally activatable initiator portion may either be added to the monomer solution or applied to the substrate in an amount of 0.01 to 0.5 mole percent, relative to the monomer to be polymerized.

REFERENCES:
patent: 4340057 (1982-07-01), Bloch et al.
patent: 4552938 (1985-11-01), Mikita et al.
patent: 4659793 (1987-04-01), Yang
patent: 4954562 (1990-09-01), Anderson
patent: 4985518 (1991-01-01), Alexander et al.
Astract of JP 04-218502, Aug. 1992.
Abstract of JP 01-103644, Apr. 1989.

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