Nippon Shokubai Co., Ltd.

Koichi Yonemura

Hirotama Fujimaru

Yoshio Irie

Hiroshi Yamazaki

Nobuyuki Harada

Takumi Hatsuda

Masazumi Sasabe

Akiko Mitsuhashi

Kazutomo Takahashi

Kozo Nogi

Kinya Nagasuna

Kenji Kadonaga

Kazumasa Kimura

Kenji Minami

Katsuhiko Sakamoto

Kazuhisa Hitomi

Takaya Hayashi

Naoko Ikushima

Method for production of porous cross-linked polymer

This invention is targeted at providing a method for producing a porous cross-linked polymer material excelling in absorption properties and mechanical strength in a short period of time. In the production of a porous cross-linked polymer material from an HIPE, the method of this invention is characterized by comprising a step of polymerizing the HIPE till the bromine value thereof falls to not more than 25% of the value existing prior to the polymerization and a subsequent step of after curing the porous cross-linked polymer material by means of an active energy ray or a temperature higher than the polymerization temperature.

Method for production of porous cross-linked polymer material

A method for producing a porous material by forming a water-in-oil type high internal phase emulsion, which method is characterized by causing waste water generated during the process of production to be put to reuse. The waste water is preferred to be reused after the removal of impurities or the adjustment of pH. According to this invention, the waste water can be reused up to 50 repetitions, with the result that the amount of feed water and the amount of waste water will be decreased. Incidentally, by adjusting the pH of the water-in-oil type high internal phase emulsion after the reaction thereof in the range of 4-9, it is made possible to continue the reuse of waste water and, at the same time, lower the stimulating property of the produced porous material.

Method for production of porous material

The present invention provides a water-swellable crosslinked polymer that displays high absorption capacity when put under an increased pressure in a state combined with a fibrous base matter. The water-swellable crosslinked polymer has a total pore volume of 60 v/v % or more relative to the entire amount of the absorption of a physiological salt solution into the polymer with regard to pores with a pore size of 51-270 .ANG. when swollen with the physiological salt solution, or the polymer has a total pore volume of 80 v/v % or more relative to the entire amount of the absorption of ion-exchanged water into the polymer with regard to pores with a pore size of 51-270 .ANG. when swollen with the ion-exchanged water.

Water-swellable crosslinked polymer, production process therefor, and

Water-absorbent resins which are prepared by mixing polysaccharides with amino acids (amino acids and/or polymers of amino acids) and heating the mixture so as to cause a crosslinking reaction therein. Each of the water-absorbent resins has a water-absorbing ratio of not less than 10 g/g with respect to physiologic saline as well as having a rate of biodegradability of not less than 10%. Moreover, its water-absorbing ratio under pressure is not less than 10 ml/g with respect to physiologic saline. The water-absorbing ratio under pressure is measured by using a measuring device that is constituted of a weighing machine, a container, an air-intake pipe, a conduit, a glass filter, and a measuring section. The water-absorbent resins are superior in both water-absorbing capacity and biodegradability, and are capable of maintain their water-absorbing capacity even under pressure.

Water-absorbent resins and manufacturing methods thereof

A method for the production of a particulate hydrated gel polymer, which includes heating a hydrated gel polymer possessed of a cross-linked structure to a temperature in the range of from 45.degree. to 90.degree. C. and extruding the resultant hot hydrated gel polymer through a perforated plate containing holes of a diameter in the range of from 6.5 to 18 mm and an absorbent resin which includes drying the resultant particulate hydrated gel polymer.

Method for production of particulate hydrated gel polymer and absorbent

A method for the production of a particulate hydrogel polymer by the exposure of a hydrogel polymer possessing a cross-linked structure to shear force in a vessel thereby finely dividing said hydrogel polymer, which method comprises exerting shear force repeatedly on said hydrogel polymer while keeping said hydrogel polymer at a temperature in the range of from 40.degree. to 110.degree. C. under a mechanical pressure in the range of from 0.01 to 1.5 kg/cm.sup.2, and method for the production of an absorbent resin comprising drying the resultant particulate hydrogel polymer.

Method for production of particulate hydrogel polymer and absorbent resin

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Suita, Japan

Koichi Yonemura