1
Kimura Kazumasa, Nagasuna Kinya, Namba Takashi, Kadonaga Kenji, Miyake Koji, Shimomura Tadao: Water-absorbent resin and production process.. Nippon Catalytic Chem, January 3, 1990: EP0349240-A2 (73 worldwide citation)

This invention relates to a water-absorbent resin of new, novel type obtained from polymerization of a water-soluble ethylenically unsaturated monomer followed by surface treatment and, in addition, a process for producing this resin. The water-absorbent resin in this invention has average particle ...


2
Yano Kazutaka, Kajikawa Katsuhiro, Nagasuna Kinya, Irie Yoshio: Method for the production of absorbent resin.. Nippon Catalytic Chem, September 8, 1993: EP0559476-A1 (67 worldwide citation)

An absorbent resin exhibiting a high absorption ratio, having only a small water-soluble component content, and have excellent gel stability to withstand the effect of aging is produced. The production of the absorbent resin comprises a step of polymerizing a water-soluble monoethylenically unsatura ...


3
Irie Yoshio, Harada Nobuyuki, Nagasuna Kinya, Hirota Kohichi, Masuda Yoshihiko, Nagano Hideaki, Kubo Hideyuki: Process for preparing absorbent resin.. Nippon Catalytic Chem, January 4, 1995: EP0632068-A1 (60 worldwide citation)

A process for preparing an absorbent resin includes the steps of: preparing a first crosslinking agent (A) including at least two polymerizable unsaturated bonds; preparing a second crosslinking agent (B) including at least two polymerizable unsaturated bonds and hydroxyl groups; preparing a crossli ...


4
Fujino Shinichi, Nakamura Masatoshi, Nagasuna Kinya: Crosslinking a water-absorbing agent. Nippon Catalytic Chem, August 25, 1999: EP0937736-A2 (55 worldwide citation)

The invention provides a process for producing a water-absorbing agent by using a crosslinking agent of high molecular weight, wherein the water-absorbing agent is excellent with good balance in respect to the absorption capacities under no load and under a heavy load and can display excellent absor ...


5
Hatsuda Takumi, Kimura Kazumasa, Nagasuna Kinya, Yano Akito: Method of treating the surface of an absorbent resin.. Nippon Catalytic Chem, October 9, 1991: EP0450923-A2 (55 worldwide citation)

A method of treating the surface of an absorbent resin, which comprises mixing (A) 100 parts by weight of an absorbent resin powder possessing a carboxyl group, (B) 0.01 to 30 parts by weight of a cross-linking agent, (C) 0 to 50 parts by weight of water, and (D) 0 to 60 parts by weight of a hydroph ...


6
Nagasuna Kinya, Kadonaga Kengi, Kimura Kazumasa, Shimomura Tadao: Method of surface-treating water-absorbent resin.. Nippon Catalytic Chem, May 24, 1989: EP0317106-A2 (50 worldwide citation)

A method of treating the surface of a water-absorbent resin is disclosed which comprises adding a hydrophilic crosslinking agent capable of reacting with at least two functional groups of the water-absorbent resin in a hydrophobic organic solvent to crosslink resin at or near its surface. The hydrop ...


7
Kimura Kazumasa, Hatsuda Takumi, Nagasuna Kinya: Method for treating the surface of an absorbent resin.. Nippon Catalytic Chem, October 9, 1991: EP0450924-A2 (49 worldwide citation)

A method for treating the surface of an absorbent resin which comprises mixing (I) 100 parts by weight of an absorbent resin powder having a carboxyl group, (II) 0.01 to 30 parts by weight of a polyhydric alcohol, (III) 0 to 50 parts by weight of water and (IV) 0 to 60 parts by weight of a hydrophil ...


8
Wada Katsuyuki, Ishizaki Kunihiko, Nagasuna Kinya: Absorbing agent composition, absorbent material, and absorbent product containing absorbent material. Nippon Catalytic Chem, March 12, 1997: EP0761241-A2 (33 worldwide citation)

There is provided an absorbing agent exhibiting superior properties for liquid absorbency and absorbed liquid retention under compressional load, making it especially useful in personal hygiene products such as disposable diapers, sanitary napkins and incontinence pads.


9
Dairoku Yorimichi, Kitayama Toshimasa, Nagasuna Kinya, Murakami Takanori, Yano Akito, Ishizaki Kunihiko: Water absorbent and process and equipment for the production thereof. Nippon Catalytic Chem, December 17, 1997: EP0812873-A1 (30 worldwide citation)

A high-speed agitation type mixer of a continuous extruding method including a plurality of agitating members provided around a rotational shaft inside a fixed casing is used to mix and react a water absorbing resin containing a carboxyl group with an aqueous liquid containing, for example, a crossl ...


10
Wada Katsuyuki, Nagasuna Kinya, Fujino Shin Ichi, Masuda Yoshihiko: Water absorbent, process for producing the same, and absorbent article containing the same. Nippon Catalytic Chem, May 22, 1996: EP0712659-A1 (28 worldwide citation)

An absorbing agent has a diffusing absorbency under pressure of not less than 25 g/g when 60 minutes elapsed after absorption is started, and a water-soluble content is above 0 percent by weight and not more than 7 percent by weight. The absorbing agent is prepared by surface-crosslinking a precurso ...