Patents by Inventor Teruyuki Kanto
Teruyuki Kanto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20090036855Abstract: Reversed phase suspension polymerization is allowed while controlling content of minor components in monomer, particularly controlling a content of acetic acid and propionic acid being not higher than 500 ppm, controlling a content of acrylic acid dimer being not higher than 1000 ppm, in acrylic acid. Cross-linked polymer obtained by the polymerization is subjected to a surface crosslinking treatment without substantially using an organic solvent, and under heating at high temperature (150° C. or higher and 250° C. or lower). Thereafter, agglomeration is carried out without substantially using an organic solvent. Accordingly, a particulate water-absorbing agent including a water-absorbing resin having superior property, and being suited for practical applications at high concentrations in absorbing cores such as a diaper and the like without generation of any odor of the organic solvent can be obtained because no volatile organic compound is included.Type: ApplicationFiled: August 5, 2005Publication date: February 5, 2009Inventors: Katsuyuki Wada, Hiroko Ueda, Teruyuki Kanto, Kunihiko Ishizaki, Motohiro Imura
-
Patent number: 7238743Abstract: The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer component including acrylic acid and/or its salt as major components to produce a water-absorbent resin that is a neutralized salt, and this process is characterized in that the acrylic acid is a product obtained by catalytic gas phase oxidation of propylene and/or propane and has a protoanemonin content of not more than 10 ppm, and in that the resultant water-absorbent resin has a neutralization ratio of not less than 50 mol %.Type: GrantFiled: June 3, 2005Date of Patent: July 3, 2007Assignee: Nippon Shokubai Co., Ltd.Inventors: Yukihiro Matsumoto, Kunihiko Ishizaki, Teruyuki Kanto
-
Publication number: 20070066167Abstract: The present invention provides a water absorbing agent which maintains excellent water absorbing properties for a long time, even when urine composition of human urine varies depending. A particulate water absorbing agent comprising a water-absorbing resin obtained by crosslinking polymerization of an unsaturated monomer, which exhibits Centrifuge retention capacity in a physiological saline solution of not lower than 32 g/g, mass median particle size (D50) of 200 to 400 ?m, ratio of particles with diameter of smaller than 150 ?m of 0 to 2% by weight, and increased extractables by deterioration of 0 to 15% by weight and extractables for one hour in deterioration test liquid of 0.1 to 30% by weight.Type: ApplicationFiled: March 29, 2005Publication date: March 22, 2007Inventors: Katsuyuki Wada, Kazuki Kimura, Hiroko Ueda, Teruyuki Kanto, Hirotama Fujimaru
-
Patent number: 7009010Abstract: To provide: a process in which a coarse gel itself is made not to form in the case of applying the aqueous solution polymerization; and a process in which the polymerization is mildly controlled and the production is stably carried out in the case of applying the reversed-phase suspension polymerization or static polymerization, in a production of a water-absorbent resin.Type: GrantFiled: December 17, 2002Date of Patent: March 7, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Teruyuki Kanto, Kunihiko Ishizaki
-
Publication number: 20050228154Abstract: The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer component including acrylic acid and/or its salt as major components to produce a water-absorbent resin that is a neutralized salt, and this process is characterized in that the acrylic acid is a product obtained by catalytic gas phase oxidation of propylene and/or propane and has a protoanemonin content of not more than 10 ppm, and in that the resultant water-absorbent resin has a neutralization ratio of not less than 50 mol %.Type: ApplicationFiled: June 3, 2005Publication date: October 13, 2005Inventors: Yukihiro Matsumoto, Kunihiko Ishizaki, Teruyuki Kanto
-
Patent number: 6927268Abstract: The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer component including acrylic acid and/or its salt as major components to produce a water-absorbent resin that is a neutralized salt, and this process is characterized in that the acrylic acid is a product obtained by catalytic gas phase oxidation of propylene and/or propane and has a protoanemonin content of not more than 10 ppm, and in that the resultant water-absorbent resin has a neutralization ratio of not less than 50 mol %.Type: GrantFiled: June 19, 2001Date of Patent: August 9, 2005Assignee: Nippon Shokubai Co., Ltd.Inventors: Yukihiro Matsumoto, Kunihiko Ishizaki, Teruyuki Kanto
-
Publication number: 20040110913Abstract: To provide: a process in which a coarse gel itself is made not to form in the case of applying the aqueous solution polymerization; and a process in which the polymerization is mildly controlled and the production is stably carried out in the case of applying the reversed-phase suspension polymerization or static polymerization, in a production of a water-absorbent resin.Type: ApplicationFiled: September 16, 2003Publication date: June 10, 2004Inventors: Teruyuki Kanto, Kunihiko Kanto
-
Patent number: 6576713Abstract: The present invention provides a production process for a water-absorbent resin powder which is excellent in particle diameter distribution and properties, wherein the production process not only inhibits adhesion and aggregation in the production steps, but also is excellent in energy efficiency, drying efficiency, and productivity.Type: GrantFiled: February 22, 2001Date of Patent: June 10, 2003Assignee: Nippon Shokubai Co., Ltd.Inventors: Kunihiko Ishizaki, Teruyuki Kanto, Nobuyuki Harada, Takumi Hatsuda, Shinichi Fujino
-
Publication number: 20020120085Abstract: The present invention provides a process for producing a water-absorbent resin of which the residual monomer content and the extractable content are low. The process for producing a water-absorbent resin comprises the step of polymerizing at least one monomer component including acrylic acid and/or its salt as major components to produce a water-absorbent resin that is a neutralized salt, and this process is characterized in that the acrylic acid is a product obtained by catalytic gas phase oxidation of propylene and/or propane and has a protoanemonin content of not more than 10 ppm, and in that the resultant water-absorbent resin has a neutralization ratio of not less than 50 mol %.Type: ApplicationFiled: June 19, 2001Publication date: August 29, 2002Applicant: Nippon Shokubai Co., Ltd.Inventors: Yukihiro Matsumoto, Kunihiko Ishizaki, Teruyuki Kanto
-
Publication number: 20010025093Abstract: The present invention provides a production process for a water-absorbent resin powder which is excellent in particle diameter distribution and properties, wherein the production process not only inhibits adhesion and aggregation in the production steps, but also is excellent in energy efficiency, drying efficiency, and productivity.Type: ApplicationFiled: February 22, 2001Publication date: September 27, 2001Inventors: Kunihiko Ishizaki, Teruyuki Kanto, Nobuyuki Harada, Takumi Hatsuda, Shinichi Fujino
-
Patent number: 6254990Abstract: The present invention provides a surface-crosslinking process of a water-absorbent resin to obtain a water-absorbing agent which has high absorption speed and excellent absorption capacity under a load (a water-absorbent resin which has specific or larger values of properties). In a process comprising the step of adding a crosslinking agent to a dry water-absorbent resin powder to thereby crosslink the neighborhood of its surface, the surface-crosslinking is carried out while the resin powder having a weight-average particle diameter of 200 to 1,000 &mgr;m is pulverized.Type: GrantFiled: February 14, 1999Date of Patent: July 3, 2001Assignee: Nippon Shokubai Co., Ltd.Inventors: Kunihiko Ishizaki, Teruyuki Kanto, Shigeru Sakamoto, Nobuyuki Harada, Kazuhisa Hitomi
-
Patent number: 6107358Abstract: 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.Type: GrantFiled: August 21, 1997Date of Patent: August 22, 2000Assignee: Nippon Shokubai Co., Ltd.Inventors: Nobuyuki Harada, Koji Miyake, Yoshihiro Motono, Hideyuki Tahara, Takumi Hatsuda, Teruyuki Kanto, Akito Yano, Yorimichi Dairoku, Kazuki Kimura, Yasuhiro Fujita
-
Patent number: 6100305Abstract: A water-absorbent resin is produced by crushing a mass of crosslinked hydrogel polymer having high adhesion and elastic properties without kneading it, and drying the crushed crosslinked hydrogel polymer. In the case when the crosslinked hydrogel polymer includes cells therein, the crosslinked hydrogel polymer is crushed so as to restrain reduction in the number of cells contained in the crosslinked hydrogel polymer. The crosslinked hydrogel polymer is crushed by any of crushing methods including: shearing the crosslinked hydrogel polymer with a fixed blade and a rotary blade; cutting the crosslinked hydrogel polymer with a cutter having a pair of rotary blades that are mounted on different shafts and rotate while at least partly overlapping each other; cutting the crosslinked hydrogel polymer with a cutter having a rotary blade using a lubricant; and crushing the crosslinked hydrogel polymer after freezing.Type: GrantFiled: June 18, 1998Date of Patent: August 8, 2000Assignee: Nippon Shokubai Co., Ltd.Inventors: Koji Miyake, Yoshihiro Motono, Nobuyuki Harada, Akito Yano, Teruyuki Kanto, Shigeru Sakamoto
-
Patent number: 5998556Abstract: N-Cyclohexylmaleimide having a cyclohexylaminosuccinic anhydride content of 0.001 to 1 wt. % is used as the main raw material for the production of heat-resistant resins. The resins are produced by a process of copolymerizing the above material with at least one monomer copolymerizable therewith which is characterized by the use of a monomer having a low yellowness, the addition of a compound which can inhibit the evaporation of the non-radical compounds contained in the monomer through reactions, the addition of an antioxidant, the use of a solvent containing alcohol, or the presence of a non-radical-polymerizable acid anhydride or carboxylic acid. The heat-resistant resins produced by the use of the above raw material or the above process are excellent in transparency, i.e., less discolorable, even when an increased amount of N-cyclohexylmaleimide is used for the purpose of imparting more excellent heat resistance.Type: GrantFiled: May 20, 1997Date of Patent: December 7, 1999Assignee: Nippon Shokubai Co., Ltd.Inventors: Teruyuki Kanto, Kenichi Ueda, Kazumi Fujioka, Kazuo Kishino