Nippon Shokubai Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Yoshihiro Motono

Nobuyuki Harada

Kunihiko Ishizaki

Yorimichi Dairoku

Koji Miyake

Kinya Nagasuna

Shigeru Sakamoto

Yoshihiko Masuda

Hisanobu Obara

Takumi Hatsuda

Tadao Shimomura

Toshimasa Kitayama

Teruyuki Kanto

Akito Yano

Yasuhiro Fujita

Kazuki Kimura

Hideyuki Tahara

Kazumasa Kimura

Takashi Namba

A method for the production of a water-absorbent agent comprises mixing an absorbent resin containing a carboxyl group with an additive soluble in the aqueous solution of at least one member selected from the group consisting of inorganic acids, organic acids, and polyamino acids and a cross-linking agent capable of reacting with the carboxyl group. A water-absorbent agent obtained by adding from 0.005 to 8 parts by weight of an epoxy compound to 100 parts by weight of a water-absorbent resin, exhibiting an absorption capacity without load of at least 45 (g/g), an absorption capacity under load of 20 g/cmof not less than 30 (ml/g) and having a residue amount of an epoxy compound of not more than 2 ppm. A water-absorbent composition comprises a polyamino acid (salt) and a water-absorbent resin containing a carboxyl group.

Absorbent resin composition

Water-absorbent agent, method for production thereof, and water-absorbent composition

A water-absorbent resin is produced by dispersing a solid blowing agent having an average particle diameter within a range of from 1 &mgr;m to 100 &mgr;m in an aqueous monomer solution containing an unsaturated monomer and a cross-linking agent, and then polymerizing the unsaturated monomer. The water-absorbent resin has excellent water absorption characteristics, such as improved dispersion and absorption rate of aqueous fluid, enhanced water retention capacity and dry touch, lower water-soluble component content, and lower residual monomer content. When a water-absorbent resin composition using the water-absorbent resin is used for, for example, a sanitary material, it is possible to improve the absorption rate and water retention capacity, and prevent leakage of fluid from the sanitary material.

Process for production of water absorbent resin

The invention provides a production process of a water-absorbent resin, by which process the polymerization temperature can be controlled in static aqueous solution polymerization. The production process of a water-absorbent resin comprises the step of polymerizing statically an aqueous solution with a thickness of 10&tilde;50 mm including a hydrophilic monomer, and is characterized in that the polymerization heat is removed using both cooling due to heat conduction transfer and cooling due to the latent heat of vaporization, thereby controlling the maximum attained temperature of the polymerization system in the range of 60&tilde;95&deg;C. or controlling the increase in solid content in the range of 0.2 to 10 weight %.

Production process of water-absorbent resin

Method of producing a hydrophilic resin

A method for the production of a water-absorbent resin capable of fast water absorption is disclosed which comprises the steps of dispersing bubbles of an inert gas in an aqueous monomer solution of a mixture of a water-soluble unsaturated monomer and a water-soluble cross-linking monomer and subjecting the mixture to copolymerization under the condition that a volume of the monomer solution wherein the inert gas is dispersed is in the range of 1.02 to 5 times of a volume of non-dispersant state.

Water-absorbent resin and method for production thereof

Method of production of water-absorbing resin

Absorbent resin, absorbent material and method of manufacturing the same

Water-absorbent resin, process for production thereof, and

This invention concerns an absorbent composite a supporting member and a cationic absorbent polymer and anionic absorbent polymer particles fixed to the supporting member. This absorbent composite excels in absorbing capacity under pressure, vertical aspiration power, and flexibility and suffers only sparing exfoliation of an absorbent polymer. This invention further concerns an absorbent composite which contains an absorbent polymer in an amount of at least 30% by weight based on the total weight of the absorbent composite and, after absorbing a liquid, shows a value of not less than 3 for the expansion anisotropy specified by the following formula.

Absorbent composite, method for production thereof, and absorbent article

A method for the production of a water-absorbent agent comprises mixing an absorbent resin containing a carboxyl group with an additive soluble in the aqueous solution of at least one member selected from the group consisting of inorganic acids, organic acids, and polyamino acids and a cross-linking agent capable of reacting with the carboxyl group. A water-absorbent agent obtained by adding from 0.005 to 8 parts by weight of an epoxy compound to 100 parts by weight of a water-absorbent resin, exhibiting an absorption capacity without load of at least 45 (g/g), an absorption capacity under load of 20 g/cm.sup.2 of not less than 30 (ml/g) and having a residue amount of an epoxy compound of not more than 2 ppm. A water-absorbent composition comprises a polyamino acid (salt) and a water-absorbent resin containing a carboxyl group.

Water-absorbent agent, method for production thereof, and

In a body fluid-absorbing article composed of a liquid-permeable front-surface member, a liquid-impermeable rear-surface member, and a fibrous absorbent member nipped therebetween and adapted to be used with the front-surface member held in contact with the human body, by the improvement having disposed in half of the thickness of the absorbent member on the front-surface member side an absorbent composite (A) obtained by applying an ethylenically unsaturated monomer capable of forming an absorbent polymer by polymerization or an aqueous solution of the monomer to a fibrous web and thereafter polymerizing the monomer.

Body fluid-absorbing article

Growing community of inventors

Hyogo, Japan

Yoshihiro Motono