Water absorbent crosslinked polymer and a method of...

D - Textiles – Paper – 06 – M

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400/1355

D06M 14/00 (2006.01) A61L 15/00 (2006.01) C08F 251/02 (2006.01) D06M 14/04 (2006.01)

Patent

CA 1244982

ABSTRACT OF THE DISCLOSURE A water absorbent crosslinked polymer having at least 70 % by weight of acrylic acid monomeric units, 60 to 90 % of the carboxyl groups of which are in the form of an alkali metal salt, produced by a method in which a mixture comprised of acrylic acid, 60 to 90 % of the carboxyl groups of which are in the form of an alkali metal salt, and a fibrous cellulosic material is heated in the presence of a radical initiator. The polymerization temperature can be effectively con- trolled by smooth evaporation of water. The cross- linked polymer can absorb such a large amount of water as several hundred times the weight of the polymer in an excellent absorption rate, and finds applications as, for example, a disposable diaper and a sanitary napkin.

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