Patents by Inventor Daigo Nakaya
Daigo Nakaya 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: 20230250211Abstract: A method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and where: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.Type: ApplicationFiled: April 20, 2023Publication date: August 10, 2023Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Toru TAKAHASHI, Daigo NAKAYA, Kensuke OSHIMA, Daisuke SUNAGA
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Patent number: 11667745Abstract: The present invention addresses the problem of providing a method for producing an oxymethylene copolymer, which is capable of producing an oxymethylene copolymer having a high molecular weight with high yield and high economic efficiency. This problem is able to be solved by a method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and wherein: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.Type: GrantFiled: November 6, 2017Date of Patent: June 6, 2023Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Toru Takahashi, Daigo Nakaya, Kensuke Oshima, Daisuke Sunaga
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Publication number: 20200055974Abstract: The present invention addresses the problem of providing a method for producing an oxymethylene copolymer, which is capable of producing an oxymethylene copolymer having a high molecular weight with high yield and high economic efficiency. This problem is able to be solved by a method for producing an oxymethylene copolymer, in which a copolymer starting material containing a trioxane and a comonomer is subjected to a polymerization reaction in the presence of a polymerization initiator that contains an acidic compound (A), and wherein: the copolymer starting material contains a basic compound (B); an acidic compound (C) that is different from the acidic compound (A) is added into the copolymer starting material before performing the polymerization reaction, thereby causing a reaction between the basic compound (B) and the acidic compound (C) in advance; and the polymerization reaction is carried out by means of melt polymerization.Type: ApplicationFiled: November 6, 2017Publication date: February 20, 2020Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Toru TAKAHASHI, Daigo NAKAYA, Kensuke OSHIMA, Daisuke SUNAGA
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Patent number: 10280258Abstract: The present invention provides a method for producing an oxymethylene copolymer which involves polymerizing trioxane and a comonomer cationically at a polymerization temperature of 135° C. to 300° C. in the presence of a protic acid salt having the molecular weight of 1000 or less, and at least one polymerization initiator selected from the group consisting of protic acids, protic acid anhydrides, and protic acid ester compounds having the molecular weight of 1000 or less.Type: GrantFiled: June 30, 2014Date of Patent: May 7, 2019Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo Nakaya, Toru Takahashi, Satoshi Mochida
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Patent number: 10138321Abstract: The invention provides a method for producing an oxymethylene copolymer including a polymerization step for cationically polymerizing trioxane and a comonomer at a polymerization temperature of from 135 to 300° C. in the presence of at least one salt of a protonic acid having a molecular weight of 1,000 or less, and at least one polymerization initiator selected from the group consisting of protonic acids having a molecular weight of 1,000 or less, protonic acid anhydrides having a molecular weight of 1,000 or less, and protonic acid ester compounds having a molecular weight of 1,000 or less; wherein the total concentration of metal components contained in the trioxane and comonomer used in the polymerization step is 300 ppb by mass or less.Type: GrantFiled: December 1, 2015Date of Patent: November 27, 2018Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo Nakaya, Toru Takahashi, Satoshi Mochida, Kensuke Oshima
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Publication number: 20180265617Abstract: The invention provides a method for producing an oxymethylene copolymer including a polymerization step for cationically polymerizing trioxane and a comonomer at a polymerization temperature of from 135 to 300° C. in the presence of at least one salt of a protonic acid having a molecular weight of 1,000 or less, and at least one polymerization initiator selected from the group consisting of protonic acids having a molecular weight of 1,000 or less, protonic acid anhydrides having a molecular weight of 1,000 or less, and protonic acid ester compounds having a molecular weight of 1,000 or less; wherein the total concentration of metal components contained in the trioxane and comonomer used in the polymerization step is 300 ppb by mass or less.Type: ApplicationFiled: December 1, 2015Publication date: September 20, 2018Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo NAKAYA, Toru TAKAHASHI, Satoshi MOCHIDA, Kensuke OSHIMA
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Patent number: 9902797Abstract: The present invention is directed to a method for producing an oxymethylene copolymer by subjecting trioxane and 1,3-dioxolane to copolymerization using boron trifluoride or a coordination compound thereof as a catalyst, wherein the copolymerization is conducted in the presence of a steric-hindrance phenol in an amount of 0.006 to 2.0% by weight, based on the weight of the trioxane, using 0.01 to 0.07 mmol of boron trifluoride or a coordination compound thereof as a catalyst, relative to 1 mol of the trioxane, and wherein, at a point in time when the polymerization yield becomes 92% or more, the formed oxymethylene copolymer and a polymerization terminator are contacted to terminate the polymerization.Type: GrantFiled: May 10, 2013Date of Patent: February 27, 2018Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo Nakaya, Tsutomu Miyoshi, Akira Ito, Satoshi Mochida
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Publication number: 20160369050Abstract: The present invention provides a method for producing an oxymethylene copolymer which involves polymerizing trioxane and a comonomer cationically at a polymerization temperature of 135° C. to 300° C. in the presence of a protic acid salt having the molecular weight of 1000 or less, and at least one polymerization initiator selected from the group consisting of protic acids, protic acid anhydrides, and protic acid ester compounds having the molecular weight of 1000 or less.Type: ApplicationFiled: June 30, 2014Publication date: December 22, 2016Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo NAKAYA, Toru TAKAHASHI, Satoshi MOCHIDA
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Publication number: 20150112018Abstract: The present invention is directed to a method for producing an oxymethylene copolymer by subjecting trioxane and 1,3-dioxolane to copolymerization using boron trifluoride or a coordination compound thereof as a catalyst, wherein the copolymerization is conducted in the presence of a steric-hindrance phenol in an amount of 0.006 to 2.0% by weight, based on the weight of the trioxane, using 0.01 to 0.07 mmol of boron trifluoride or a coordination compound thereof as a catalyst, relative to 1 mol of the trioxane, and wherein, at a point in time when the polymerization yield becomes 92% or more, the formed oxymethylene copolymer and a polymerization terminator are contacted to terminate the polymerization.Type: ApplicationFiled: May 10, 2013Publication date: April 23, 2015Applicant: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Daigo Nakaya, Tsutomu Miyoshi, Akira Ito, Satoshi Mochida
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Patent number: 6617416Abstract: A polyoxymethylene copolymer which is a polyoxymethylene copolymer obtained by copolymerizing trioxane and 8 to 20 mol, per 100 mol of the trioxane, of 1,3-dioxolane and which (i) has a crystallization time period of 10 to 2,000 seconds at 143° C., (ii) withstands 30 to 1,000 cycles of a bending durability test and (iii) has residence heat stability for 40 minutes or more, and a molded article formed of the copolymer. According to the present invention, there can be provided a polyoxymethylene copolymer excellent in bending durability and heat stability and excellent in moldability, and a molded article formed thereof.Type: GrantFiled: October 15, 2002Date of Patent: September 9, 2003Assignee: Mitsubishi Gas Chemical Company, Inc.Inventors: Takahiro Nakamura, Masanori Furukawa, Akira Okamura, Daigo Nakaya, Isamu Masumoto
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Publication number: 20030125512Abstract: A polyoxymethylene copolymer which is a polyoxymethylene copolymer obtained by copolymerizing trioxane and 8 to 20 mol, per 100 mol of the trioxane, of 1,3-dioxolane and which (i) has a crystallization time period of 10 to 2,000 seconds at 143° C., (ii) withstands 30 to 1,000 cycles of a bending durability test and (iii) has residence heat stability for 40 minutes or more, and a molded article formed of the copolymer.Type: ApplicationFiled: October 15, 2002Publication date: July 3, 2003Inventors: Takahiro Nakamura, Masanori Furukawa, Akira Okamura, Daigo Nakaya, Isamu Masumoto
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Publication number: 20030105199Abstract: A polyoxymethylene resin composition consisting essentially of 100 parts by weight of a polyoxymethylene copolymer containing an oxymethylene unit as a main recurring unit and 1 to 30 mol, per 100 mol of the oxymethylene unit, of an oxyalkylene unit having at least 2 carbon atoms as a unit from a comonomer and 1 to 50 parts by weight of a polyalkylene glycol, and a molded article formed of the resin composition. The polyoxymethylene resin composition has high tenacity and high flexibility, is excellent in folding durability and is excellent in compatibility and dispersibility, and it gives a molded article having excellent folding durability and an excellent surface condition.Type: ApplicationFiled: November 12, 2002Publication date: June 5, 2003Applicant: Mitsubishi Gas Chemical Company, Inc.Inventors: Masanori Furukawa, Daigo Nakaya, Katsushige Hayashi, Hiroshi Mimura, Daisuke Sunaga