Patents by Inventor Tsutomu Yuasa
Tsutomu Yuasa 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).
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Publication number: 20160031759Abstract: An object of the present invention is to provide a polycarboxylic acid polymer for blending in cement for a cement composition superior both in dispersion and dispersibility-retention.Type: ApplicationFiled: September 28, 2015Publication date: February 4, 2016Inventors: Tsutomu YUASA, Noboru SAKAMOTO, Mari OTANI
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Patent number: 8754264Abstract: To provide a production method of a (poly)alkylene glycol chain-containing polymer which can be preferably used in various applications such as an admixture for cement and which can exhibit extremely high dispersibility to a cement composition. The unsaturated (poly)alkylene glycol ether monomer of the present invention is an unsaturated (poly)alkylene glycol ether monomer production method for producing an unsaturated (poly)alkylene glycol ether monomer by addition reaction of an alkylene oxide on an unsaturated alcohol, wherein the production method includes a step of carrying out addition reaction under condition of existence of 0.01 to 25 parts by mass of an unsaturated (poly)alkylene glycol diether monomer to 100 parts by mass of the unsaturated alcohol, and a (poly)alkylene glycol chain-containing polymer production method, wherein a monomer component including an unsaturated (poly)alkylene glycol ether monomer produced by the production method.Type: GrantFiled: April 4, 2008Date of Patent: June 17, 2014Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Yuko Matsuda, Naohiko Itayama, Hideaki Nagano
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Patent number: 8476341Abstract: The present invention provides a multi-branched polyalkylene glycol polymer useful for various applications, especially for an admixture for cement, a dispersant, admixture for cement, and cement composition each comprising the same, a thiol compound having a polyalkylene glycol chain useful for materials and the like of the polymer, and a method for easily and effectively producing the multi-branched polyalkylene glycol polymer and the thiol compound having a polyalkylene glycol chain at low cost. The multi-branched polymer comprises: a polyalkylene glycol chain; a residue of a compound having three or more active hydrogen atoms; and a polymer portion having a constitutional unit derived from a vinyl monomer component, one end of the polyalkylene glycol chain bonding to the residue, and a terminal oxygen atom of at least one of the other ends of the polyalkylene glycol chain bonding to a main chain end of the polymer portion directly or via an organic residue.Type: GrantFiled: September 8, 2009Date of Patent: July 2, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Noboru Sakamoto, Tsutomu Yuasa
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Patent number: 8344085Abstract: The present invention provides a novel polymer, and a mixture and a cement admixture thereof. The cement admixture has higher dispersibility compared to the previous ones. The novel polymer of the present invention has a different structure from the conventional copolymers used for cement admixtures, using an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer as the monomer components. The novel polymer of the present invention basically contains a polyalkylene glycol chain and a polymer segment bonded to the chain. Another type of the novel polymer of the present invention contains two polyalkylene glycol chains and a polymer segment connecting the chains. In these polymers, at least one of unsaturated monomers constituting the polymer segment is an unsaturated carboxylic acid monomer or an unsaturated polyalkylene glycol monomer. The cement admixture of the present invention comprises a polymer, made from these monomers, or a mixture thereof.Type: GrantFiled: November 3, 2010Date of Patent: January 1, 2013Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Noboru Sakamoto, Yuko Matsuda
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Publication number: 20120208949Abstract: To provide a polyalkylene glycol chain-containing thiol polymer which is excellent in various performances, particularly significantly excellent in cement dispersibility, and useful in various applications such as an admixture for cement; a thiol-modified monomer or mixture thereof, which can produce such polymer; production methods of the polymer and the monomer; and a dispersant and an admixture for cement, each including the polymer. The polyalkylene glycol chain-containing thiol polymer is a polyalkylene glycol chain-containing thiol polymer, wherein the polymer comprises a polyalkylene glycol chain and a polymer segment bonded to at least one end of the polyalkylene glycol chain with a sulfur atom-containing group therebetween, the polymer segment includes a constitutional unit derived from an unsaturated monomer component, and the unsaturated monomer component includes an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer.Type: ApplicationFiled: April 20, 2012Publication date: August 16, 2012Applicant: NIPPON SHOKUBAI CO, LTDInventors: Noboru Sakamoto, Tsutomu Yuasa
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Patent number: 8188167Abstract: To provide a polyalkylene glycol chain-containing thiol polymer which is excellent in various performances, particularly significantly excellent in cement dispersibility, and useful in various applications such as an admixture for cement; a thiol-modified monomer or a mixture thereof, which can produce such a polymer; production methods of the polymer and the monomer; and a dispersant and an admixture for cement, each including the polymer. The polyalkylene glycol chain-containing thiol polymer of the present invention is a polyalkylene glycol chain-containing thiol polymer, wherein the polymer comprises a polyalkylene glycol chain and a polymer segment bonded to at least one end of the polyalkylene glycol chain with a sulfur atom-containing group therebetween, the polymer segment includes a constitutional unit derived from an unsaturated monomer component, and the unsaturated monomer component includes an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer.Type: GrantFiled: March 21, 2008Date of Patent: May 29, 2012Assignee: Nippon Shokubai Co., Ltd.Inventors: Noboru Sakamoto, Tsutomu Yuasa
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Publication number: 20110160393Abstract: The present invention provides a multi-branched polyalkylene glycol polymer useful for various applications, especially for an admixture for cement, a dispersant, admixture for cement, and cement composition each comprising the same, a thiol compound having a polyalkylene glycol chain useful for materials and the like of the polymer, and a method for easily and effectively producing the multi-branched polyalkylene glycol polymer and the thiol compound having a polyalkylene glycol chain at low cost. The multi-branched polymer comprises: a polyalkylene glycol chain; a residue of a compound having three or more active hydrogen atoms; and a polymer portion having a constitutional unit derived from a vinyl monomer component, one end of the polyalkylene glycol chain bonding to the residue, and a terminal oxygen atom of at least one of the other ends of the polyalkylene glycol chain bonding to a main chain end of the polymer portion directly or via an organic residue.Type: ApplicationFiled: September 8, 2009Publication date: June 30, 2011Inventors: Noboru Sakamoto, Tsutomu Yuasa
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Publication number: 20110046269Abstract: The present invention provides a novel polymer, and a mixture and a cement admixture thereof. The cement admixture has higher dispersibility compared to the previous ones. The novel polymer of the present invention has a different structure from the conventional copolymers used for cement admixtures, using an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer as the monomer components. The novel polymer of the present invention basically contains a polyalkylene glycol chain and a polymer segment bonded to the chain. Another type of the novel polymer of the present invention contains two polyalkylene glycol chains and a polymer segment connecting the chains. In these polymers, at least one of unsaturated monomers constituting the polymer segment is an unsaturated carboxylic acid monomer or an unsaturated polyalkylene glycol monomer. The cement admixture of the present invention comprises a polymer, made from these monomers, or a mixture thereof.Type: ApplicationFiled: November 3, 2010Publication date: February 24, 2011Inventors: Tsutomu Yuasa, Noboru Sakamoto, Yuko Matsuda
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Patent number: 7851576Abstract: The present invention provides a novel polymer, and a mixture and a cement admixture thereof. The cement admixture has higher dispersibility compared to the previous ones. The novel polymer of the present invention has a different structure from the conventional copolymers used for cement admixtures, using an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer as the monomer components. The novel polymer of the present invention basically contains a polyalkylene glycol chain and a polymer segment bonded to the chain. Another type of the novel polymer of the present invention contains two polyalkylene glycol chains and a polymer segment connecting the chains. In these polymers, at least one of unsaturated monomers constituting the polymer segment is an unsaturated carboxylic acid monomer or an unsaturated polyalkylene glycol monomer. The cement admixture of the present invention comprises a polymer, made from these monomers, or a mixture thereof.Type: GrantFiled: September 27, 2006Date of Patent: December 14, 2010Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Noboru Sakamoto, Yuko Matsuda
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Publication number: 20100130793Abstract: To provide a production method of a (poly)alkylene glycol chain-containing polymer which can be preferably used in various applications such as an admixture for cement and which can exhibit extremely high dispersibility to a cement composition. The unsaturated (poly)alkylene glycol ether monomer of the present invention is an unsaturated (poly)alkylene glycol ether monomer production method for producing an unsaturated (poly)alkylene glycol ether monomer by addition reaction of an alkylene oxide on an unsaturated alcohol, wherein the production method includes a step of carrying out addition reaction under condition of existence of 0.01 to 25 parts by mass of an unsaturated (poly)alkylene glycol diether monomer to 100 parts by mass of the unsaturated alcohol, and a (poly)alkylene glycol chain-containing polymer production method, wherein a monomer component including an unsaturated (poly)alkylene glycol ether monomer produced by the production method.Type: ApplicationFiled: April 4, 2008Publication date: May 27, 2010Applicant: NIPPON SHOKUBAI CO. LTDInventors: Tsutomu Yuasa, Yuko Matsuda, Naohiko Itayama, Hideaki Nagano
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Publication number: 20100105810Abstract: To provide a polyalkylene glycol chain-containing thiol polymer which is excellent in various performances, particularly significantly excellent in cement dispersibility, and useful in various applications such as an admixture for cement; a thiol-modified monomer or a mixture thereof, which can produce such a polymer; production methods of the polymer and the monomer; and a dispersant and an admixture for cement, each including the polymer. The polyalkylene glycol chain-containing thiol polymer of the present invention is a polyalkylene glycol chain-containing thiol polymer, wherein the polymer comprises a polyalkylene glycol chain and a polymer segment bonded to at least one end of the polyalkylene glycol chain with a sulfur atom-containing group therebetween, the polymer segment includes a constitutional unit derived from an unsaturated monomer component, and the unsaturated monomer component includes an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer.Type: ApplicationFiled: March 21, 2008Publication date: April 29, 2010Applicant: Nippon Shokubai Co., Ltd.Inventors: Noboru Sakamoto, Tsutomu Yuasa
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Patent number: 7662884Abstract: It is an object of the present invention, which has been made in view of the above-mentioned state of the art, to provide a cement admixture capable of improving the water-reducing ability of cement compositions and the like and enhancing the strength and durability of hardened products produced therefrom and further capable of adjusting the viscosity of such compositions so as to facilitate the works at the sites of handling the same, as well as a method of producing such cement additive. A cement admixture comprising a polycarboxylic acid polymer and a nitrogen atom-containing compound having non-amide bond, wherein the mass ratio (A/B) between the mass (A) of said polycarboxylic acid polymer and the mass (B) of said nitrogen atom-containing compound having non-amide bond satisfies the relation 200>(A/B)>1.Type: GrantFiled: April 23, 2003Date of Patent: February 16, 2010Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Hiromichi Tanaka, Noboru Sakamoto, Tomotaka Nishikawa, Hiroko Izukashi, Toru Uno, Tsuyoshi Hirata, Tomiyasu Ueta, Yoshiyuki Onda
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Patent number: 7405264Abstract: It is an object of the present invention to provide a polycarboxylic acid polpolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement.Type: GrantFiled: August 19, 2004Date of Patent: July 29, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Tomotaka Nishikawa, Noboru Sakamoto, Tsuyoshi Hirata, Hiroko Izukashi, Tomiyasu Ueta, Hiromichi Tanaka, Yoshiyuki Onda, Toru Uno
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Patent number: 7321006Abstract: There are provided an admixture for cement which enhances water reducing property and flowability of a cement composition, and is excellent in slump retaining performance to retain the flowability with time, a polycarboxylic acid-based polymer for an admixture for cement suitable therefor, a producing method thereof, and a cement composition. One admixture for cement of the present invention contains copolymers (A) and (B) as an essential component, weight average molecular weights (AMw and BMw) of copolymers (A) and (B) are AMw>BMw, or peaktop molecular weights (AMp and BMp) of copolymers (A) and (B) are AMp>BMp. Another admixture for cement of the present invention contains a polycarboxylic acid-based polymer having a lower molecular weight side area ratio P of 50 to 87%.Type: GrantFiled: December 31, 2004Date of Patent: January 22, 2008Assignee: Nippon Shokubai Co., Ltd.Inventors: Toshio Hayashiya, Tomiyasu Ueta, Tsutomu Yuasa, Tsuyoshi Hirata, Hiroshi Yamazaki
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Patent number: 7247662Abstract: Disclosed are the following: a cement dispersant which is excellent in initial dispersibility and further in flow retainability of cement, because of using a polymer having a proper molecular weight distribution; a process for producing this cement dispersant; and a cement composition using this cement dispersant. The cement dispersant comprises a water-soluble polymer (P) as a main component, and is characterized by displaying an area proportion (a value (A?B) given by subtracting an area ratio B of a lower molecular weight side portion from an area ratio A of a higher molecular weight side portion) in the range of 13 to 60%.Type: GrantFiled: May 25, 2005Date of Patent: July 24, 2007Assignee: Nippon Shokubai Co., Ltd.Inventors: Tsutomu Yuasa, Noboru Sakamoto, Tsuyoshi Hirata
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Publication number: 20070073022Abstract: The present invention provides a novel polymer, and a mixture and a cement admixture thereof. The cement admixture has higher dispersibility compared to the previous ones. The novel polymer of the present invention has a different structure from the conventional copolymers used for cement admixtures, using an unsaturated carboxylic acid monomer and an unsaturated polyalkylene glycol monomer as the monomer components. The novel polymer of the present invention basically contains a polyalkylene glycol chain and a polymer segment bonded to the chain. Another type of the novel polymer of the present invention contains two polyalkylene glycol chains and a polymer segment connecting the chains. In these polymers, at least one of unsaturated monomers constituting the polymer segment is an unsaturated carboxylic acid monomer or an unsaturated polyalkylene glycol monomer. The cement admixture of the present invention comprises a polymer, made from these monomers, or a mixture thereof.Type: ApplicationFiled: September 27, 2006Publication date: March 29, 2007Inventors: Tsutomu Yuasa, Noboru Sakamoto, Yuko Matsuda
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Publication number: 20070073015Abstract: To provide a polymer having a specific parameter value with a very narrow molecular weight distribution different from the conventional copolymers despite of a polymer having a polyoxyalkylene chain, and an excellent dispersant for inorganic powders, particularly a cement addmixture. The polymer (P) in the present invention is containing a constitutional unit derived from a polyoxyalkylene chain, and satisfying a range of PD value defined as the following mathematical formula 1: 1<PD<MD??(Formula 1) wherein PD=Mw/Mn, MD=G(n)×Mw+H(n).Type: ApplicationFiled: September 26, 2006Publication date: March 29, 2007Inventors: Noboru Sakamoto, Yuko Matsuda, Tsutomu Yuasa, Tomotaka Nishikawa, Hiroshi Osamura
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Publication number: 20070066767Abstract: The present invention provides polyalkylene glycols hardly containing impurities and a production method thereof. Specifically, the present invention provides: polyalkylene glycols hardly containing diols such as polyethylene glycol, diesters, halogens, metals, water, coloring-causing substances; and a production method thereof. A polymerizable polyalkylene glycol satisfying the characteristics (1) and/or (2): (1) a polymerizable dimer content is 0.001 to 10% by weight and (2): a metal content is 50 ppm or less. It is more preferable that the polymerizable dimer content is 0.001 to 3.5% by weight, and it is still more preferable that the above-mentioned characteristics (1) and (2) are satisfied.Type: ApplicationFiled: August 31, 2006Publication date: March 22, 2007Applicant: Nippon Shokubai Co., Ltd.Inventors: Naohiko Itayama, Hiroshi Yamamoto, Tsutomu Yuasa
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Publication number: 20060223914Abstract: An object of the present invention is to provide a polycarboxylic acid polymer for blending in cement for a cement composition superior both in dispersion and dispersibility-retention.Type: ApplicationFiled: March 31, 2006Publication date: October 5, 2006Inventors: Tsutomu Yuasa, Noboru Sakamoto, Mari Otani
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Patent number: 7049462Abstract: It is an object of the present invention to provide a production method of a dehydration reaction product by which the occurrence of troubles in the production step or the degradation in performance characteristics or quality of various chemical products can be suppressed to a satisfactory extent. A production method of a dehydration reaction product which comprises a dehydration reaction step of subjecting a reaction solution containing a polymerizable compound to the dehydration reaction, said dehydration reaction step comprising using a dehydration reaction apparatus, said dehydration reaction apparatus comprising a reaction vessel, a condenser and a connecting pipe joining said reaction vessel with said condenser and satisfying the requirement: 0.05<(B3/A)<35 where A is a capacity (m3) of said reaction vessel and B is a total length (m) of said connecting pipe on the horizontal basis.Type: GrantFiled: November 27, 2001Date of Patent: May 23, 2006Assignee: Nippon Shokubai Co., Ltd.Inventors: Koichiro Nagare, Toru Uno, Yoshiyuki Onda, Tsutomu Yuasa, Masato Nishiue, Hisamoto Kawano