Water absorbent crosslinked polymer and a method of producing the same containing cellulosis fibers
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United States of America Patent
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Mar 3, 1987
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N/A
app pub date -
Jan 16, 1986
filing date -
Jan 19, 1985
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Expired
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Abstract
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 controlled 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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