Osaka Yuki Kagaku Kogyo Kabushiki Kaisha

Hiroyuki Kataoka

Chuzo Kato

Taiji Kambayashi

Hideyuki Mekata

Shigeaki Matsumoto

Takanori Iwamoto

Yasuhiro Morita

A shaped article of gypsum possessing heretofore unattainable high strength, a method for the production of the shaped article, and a method for the production of inclusion water indispensable to the hardening by hydration of the production of the shaped article of gypsum are disclosed.

Method for production of inclusion water for hardening gypsum, method

This invention provides a method for the manufacture of a high-expansion type absorbent polymer by first causing an absorbent polymer which is obtained by polymerization of a monomer and is possessed of an alkali salt of acrylic acid as a component of polymer to be cross-linked at the time of azeotropic dehydration thereof with a cross-linking agent possessing two or more functional groups in the presence of an inorganic salt and subsequently drying the cross-linked polymer. By the method of this invention, there can be obtained a high-expansion type absorbent material which absorbs water quickly and forms a gel not viscid but permeable to gas. This absorbent material is highly advantageously used as absorbent for sanitary materials free from leaking water and as a water-retaining agent for agricultural applications hardly causing rotton plant roots.

Method for manufacture of high-expansion type absorbent polymer

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Matsubara, Japan

Hiroyuki Kataoka