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US 4,738,867 AGranted
Process for the preparation of water absorptive composite material
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsKiichi Itoh, Takeshi Shibano
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Abstract
Aqueous solution of alkali or ammonium acrylate is applied to a prefabricated fibrous substrate, and the acrylate is subjected to polymerization in two steps, namely the first step in which the acrylate is polymerized by means of a radical polymerization initiator and the second step which is subsequent to the first step and in which the unpolymerized acrylate is polymerized by means of irradiation with electromagnetic radiation or corpuscular ionizing radiation.
Claims12
A process for preparing a water absorptive composite material, which comprises the combination of the following steps of:
- (A) applying an aqueous solution of a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate;
- (B) polymerizing the polymerizable monomers applied to said fibrous substrate by means of a water-soluble radical polymerization initiator to form a composite of a polymer derived from said polymerizable monomer and said fibrous substrate;
- and
- (C) irradiating said composite with electromagnetic radiation or corpuscular ionizing radiation to obtain a water absorptive composite of which the water absorption velocity is enhanced as compared with said composite.
1 more element
Dependencies are inferred from the claim text.