Osaka Yuki Kagaku Kogyo Kabushiki Kaisha

Shigeaki Matsumoto

Taiji Kambayashi

Chuzo Kato

Hiroyuki Kataoka

Akio Tani

Takanori Iwamoto

Yasuhiro Morita

Yukio Tanaka

Mitsumasa Matsunaga

This invention relates to a method for the purification of glycidyl acrylate or glycidyl methacrylate. Specifically, the invention effects the purification by using a residual catalyst-inactivating additive and consequently produces highly purified glycidyl acrylate or glycidyl methacrylate containing substantially no epichlorohydrin and having a low chlorine content.

Method for purification of glycidyl acrylate or glycidyl methacrylate

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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Yamatokoriyama, Japan

Shigeaki Matsumoto