Patents by Inventor Takehiro Nagasawa
Takehiro Nagasawa 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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Patent number: 11333800Abstract: An optical waveguide-forming material has a low propagation loss even in a long wavelength region and has a high refractive index at a wavelength of 1,550 nm. An optical waveguide-forming composition includes (a) 100 parts by mass of a reactive silsesquioxane compound that is a polycondensation product of an alkoxysilane compound A of the following Formula [1]: Ar1—Si(OR1)3??[1] and an alkoxysilane compound B of the following Formula [2]: Ar2—Si(OR2)3??[2] and (b) 10 to 500 parts by mass of a fluorene compound of the following Formula [3]: An optical waveguide can be formed by using the composition.Type: GrantFiled: April 27, 2018Date of Patent: May 17, 2022Assignee: NISSAN CHEMICAL CORPORATIONInventors: Takehiro Nagasawa, Sayoko Tadokoro, Tsubasa Kashino, Kentaro Ohmori
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Patent number: 10899891Abstract: A polymerizable composition includes 100 parts by mass of a reactive polysiloxane being a polycondensation product of an alkoxy silicon compound including at least an alkoxy silicon compound of formula [1], and 10 to 500 parts by mass of a polymerizable compound having at least one polymerizable double bond. (X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one substituent having a polymerizable double bond, Ar1 is a condensed ring hydrocarbon group having two or more benzene ring structures, or a hydrocarbon ring assembly group in which two or more aromatic rings are directly bonded through a single bond, and R1 is methyl group, ethyl group, or isopropyl group).Type: GrantFiled: May 24, 2017Date of Patent: January 26, 2021Assignee: NISSAN CHEMICAL CORPORATIONInventors: Takehiro Nagasawa, Taku Kato, Keisuke Shuto
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Patent number: 10894800Abstract: A polymerizable silane compound that yields a cured product exhibiting a high refractive index and a low Abbe number, used in a polymerizable composition for preparing a molded article having higher transparency. A polysiloxane being a polycondensation product of the compound of formula [1]: (wherein X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one group having a polymerizable double bond, Ar1 is a condensed polycyclic hydrocarbon group (optionally substituted with a C1-6 alkyl group), or a hydrocarbon ring assembly group wherein two or more aromatic rings are directly bonded through a single bond (optionally substituted with a C1-6 alkyl group), and R1 is a methyl, ethyl, or isopropyl group).Type: GrantFiled: May 9, 2017Date of Patent: January 19, 2021Assignee: NISSAN CHEMICAL CORPORATIONInventors: Keisuke Shuto, Taku Kato, Takehiro Nagasawa
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Patent number: 10787535Abstract: A polymerizable composition which can be cured into a cured product exhibiting a low Abbe's number and is suitable for producing a molded article having a further high transparency. A polymerizable composition including 100 parts by mass of a reactive silsesquioxane compound containing a phenanthrene ring (a), and 10 to 500 parts by mass of a polymerizable compound having at least one polymerizable double bond (b), a cured product of the polymerizable composition, and a method for producing a molded article by using of the polymerizable composition.Type: GrantFiled: March 30, 2017Date of Patent: September 29, 2020Assignee: NISSAN CHEMICAL CORPORATIONInventors: Takehiro Nagasawa, Taku Kato, Keisuke Shuto
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Patent number: 10703863Abstract: There is provided a polymerizable composition suitable to produce a molded product in which high refractive index is maintained, and dimensional change and a transmittance change further caused by a high-temperature heat history can be suppressed. A polymerizable composition comprising (a) 100 parts by mass of a specific reactive silsesquioxane compound and (b) 10 to 2,000 parts by mass of a specific fluorene compound, and a cured product obtained by curing the polymerizable composition, and a resin lens manufactured from the polymerizable composition.Type: GrantFiled: September 1, 2016Date of Patent: July 7, 2020Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Kei Yasui, Takehiro Nagasawa, Taku Kato, Keisuke Shuto
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Publication number: 20200148875Abstract: An optical waveguide-forming material has a low propagation loss even in a long wavelength region and has a high refractive index at a wavelength of 1,550 nm. An optical waveguide-forming composition includes (a) 100 parts by mass of a reactive silsesquioxane compound that is a polycondensation product of an alkoxysilane compound A of the following Formula [1]: Ar1—Si(OR1)3??[1] and an alkoxysilane compound B of the following Formula [2]: Ar2—Si(OR2)3??[2] and (b) 10 to 500 parts by mass of a fluorene compound of the following Formula [3]: An optical waveguide can be formed by using the composition.Type: ApplicationFiled: April 27, 2018Publication date: May 14, 2020Applicant: NISSAN CHEMICAL CORPORATIONInventors: Takehiro NAGASAWA, Sayoko TADOKORO, Tsubasa KASHINO, Kentaro OHMORI
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Patent number: 10550217Abstract: A polymerizable composition suitable for use in producing molded articles that can maintain a high refractive index, and can be prevented from cracking, peeling from a support, and dimensional changes due to a high-temperature thermal history. A polymerizable composition including (a) 100 parts by mass of a specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of a specific fluorene compound, and (c) 0.1 to 50 parts by mass of a polymer having a weight average molecular weight of 5,000 to 100,000; a cured product obtained by polymerizing the polymerizable composition; and a high-refractive-index resin lens material including the polymerizable composition.Type: GrantFiled: April 11, 2016Date of Patent: February 4, 2020Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro Nagasawa, Sayoko Tadokoro
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Publication number: 20200001557Abstract: A GI optical waveguide includes a core having a substantially circular cross-sectional shape. A method for manufacturing an optical waveguide, includes a first step of inserting an acicular section at the tip of a discharge unit into an uncured cladding; a second step of moving the acicular section within the uncured cladding while discharging an uncured material from the acicular section, to thereby form an uncured core surrounded by the uncured cladding; a third step of removing the acicular section from the uncured cladding; and a fourth step of curing the uncured cladding and the uncured core, wherein: the ratio of the viscosity of the material for forming the uncured core to the viscosity of the uncured cladding is 1.20 to 6 at the temperature in the second step.Type: ApplicationFiled: January 29, 2018Publication date: January 2, 2020Applicants: KEIO UNIVERSITY, NISSAN CHEMICAL CORPORATIONInventors: Takaaki ISHIGURE, Yuki SAITO, Chinami MARUSHIMA, Takehiro NAGASAWA
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Publication number: 20190338095Abstract: A production method for an optical waveguide including: a first step of inserting a needle-like portion at a tip end of an ejection unit into uncured cladding; a second step of moving the needle-like portion in the uncured cladding while ejecting an uncured material from the needle-like portion to form an uncured core surrounded and covered with the uncured cladding; a third step of removing the needle-like portion from the uncured cladding; and a fourth step of curing the uncured cladding and core, wherein the uncured cladding is composed of a composition including a reactive silicone compound composed of a polycondensate of a diarylsilicic acid compound of Formula [1] and an alkoxy silicon compound of Formula [2] Ar3—Si(OR1)aR23-a??[2], and a di(meth)acrylate compound of Formula [3] and the uncured core is composed of a composition including a reactive silicone compound and an aromatic vinyl compound of Formula [4]Type: ApplicationFiled: October 21, 2016Publication date: November 7, 2019Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takaaki ISHIGURE, Sho YOSHIDA, Yuki SAITO, Kazuki YASUHARA, Takehiro NAGASAWA, Kentaro OHMORI
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Patent number: 10465054Abstract: A production method for an optical waveguide including: a first step of inserting a needle-like portion at a tip end of an ejection unit into uncured cladding; a second step of moving the needle-like portion in the uncured cladding while ejecting an uncured material from the needle-like portion to form an uncured core surrounded and covered with the uncured cladding; a third step of removing the needle-like portion from the uncured cladding; and a fourth step of curing the uncured cladding and core, wherein the uncured cladding is composed of a composition including a reactive silicone compound composed of a polycondensate of a diarylsilicic acid compound of Formula [1] and an alkoxy silicon compound of Formula [2] Ar3—Si(OR1)aR23-a??[2] and a di(meth)acrylate compound of Formula [3] and the uncured core is composed of a composition including a reactive silicone compound and an aromatic vinyl compound of Formula [4]Type: GrantFiled: October 21, 2016Date of Patent: November 5, 2019Assignee: NISSAN CHEMICAL CORPORATIONInventors: Takaaki Ishigure, Sho Yoshida, Yuki Saito, Kazuki Yasuhara, Takehiro Nagasawa, Kentaro Ohmori
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Patent number: 10450418Abstract: A polymerizable composition suitable for producing a molded article that can maintain a high refractive index and a low Abbe's number and can be restrained from dimensional changes due to a high-temperature thermal history has (a) 100 parts by mass of a specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of a specific fluorene compound and (c) 1 to 100 parts by mass of a specific aromatic vinyl compound. A cured product can be obtained by curing the polymerizable composition.Type: GrantFiled: August 12, 2016Date of Patent: October 22, 2019Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro Nagasawa, Taku Kato, Kentaro Ohmori, Keisuke Shuto, Kenji Takase
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Publication number: 20190292324Abstract: A polymerizable composition suitable for producing a molded article that can maintain a high refractive index and a low Abbe's number and can be restrained from dimensional changes due to a high-temperature thermal history has (a) 100 parts by mass of a specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of a specific fluorene compound and (c) 1 to 100 parts by mass of a specific aromatic vinyl compound. A cured product can be obtained by curing the polymerizable composition.Type: ApplicationFiled: August 12, 2016Publication date: September 26, 2019Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro NAGASAWA, Taku KATO, Kentaro OHMORI, Keisuke SHUTO, Kenji TAKASE
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Publication number: 20190256664Abstract: A polymerizable composition includes 100 parts by mass of a reactive polysiloxane being a polycondensation product of an alkoxy silicon compound including at least an alkoxy silicon compound of formula [1], and 10 to 500 parts by mass of a polymerizable compound having at least one polymerizable double bond. (X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one substituent having a polymerizable double bond, Ar1 is a condensed ring hydrocarbon group having two or more benzene ring structures, or a hydrocarbon ring assembly group in which two or more aromatic rings are directly bonded through a single bond, and R1 is methyl group, ethyl group, or isopropyl group).Type: ApplicationFiled: May 24, 2017Publication date: August 22, 2019Applicant: NISSAN CHEMICAL CORPORATIONInventors: Takehiro NAGASAWA, Taku KATO, Keisuke SHUTO
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Publication number: 20190256533Abstract: A polymerizable silane compound that yields a cured product exhibiting a high refractive index and a low Abbe number, used in a polymerizable composition for preparing a molded article having higher transparency. A polysiloxane being a polycondensation product of the compound of formula [1]: (wherein X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one group having a polymerizable double bond, Ar1 is a condensed polycyclic hydrocarbon group (optionally substituted with a C1-6 alkyl group), or a hydrocarbon ring assembly group wherein two or more aromatic rings are directly bonded through a single bond (optionally substituted with a C1-6 alkyl group), and R1 is a methyl, ethyl, or isopropyl group).Type: ApplicationFiled: May 9, 2017Publication date: August 22, 2019Applicant: NISSAN CHEMICAL CORPORATIONInventors: Keisuke SHUTO, Taku KATO, Takehiro NAGASAWA
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Publication number: 20190169345Abstract: A polymerizable composition which can be cured into a cured product exhibiting a low Abbe's number and is suitable for producing a molded article having a further high transparency. A polymerizable composition including 100 parts by mass of a reactive silsesquioxane compound containing a phenathrene ring (a), and 10 to 500 parts by mass of a polymerizable compound having at least one polymerizable double bond (b), a cured product of the polymerizable composition, and a method for producing a molded article by using of the polymerizable composition.Type: ApplicationFiled: March 30, 2017Publication date: June 6, 2019Applicant: NISSAN CHEMICAL CORPORATIONInventors: Takehiro NAGASAWA, Taku KATO, Keisuke SHUTO
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Patent number: 10308750Abstract: A polymerizable composition that is suitable to produce a molded product that can suppress cracking and dimensional change caused by a high-temperature heat history with a high refractive index of a cured product maintained. A polymerizable composition including (a) 100 parts by mass of the specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of the specific fluorene compound, a cured product obtained by the polymerizable composition and a material for a high-refractive index resin lens including the polymerizable composition.Type: GrantFiled: February 26, 2015Date of Patent: June 4, 2019Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Kentaro Ohmori, Takehiro Nagasawa
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Patent number: 10253126Abstract: An optical waveguide-forming composition: 100 parts by mass of a reactive silicone compound (a) composed of a polycondensate of a diarylsilicic acid compound A of Formula [1] Ar1 and Ar2 are a phenyl, naphthyl or a biphenyl group optionally substituted, and an alkoxy silicon compound B of Formula [2] Ar3—Si(OR1)aR23-a??[2]. Ar3 is a phenyl, naphthyl or biphenyl group having at least one group having a polymerizable double bond, R1 is methyl or ethyl group, R2 is methyl, ethyl, or vinylphenyl group, and a is 2 or 3, and 1 part by mass to 200 parts by mass of a di(meth)acrylate compound (b) of Formula [3]. R3 and R4 are a hydrogen atom or methyl group, R5 is a hydrogen atom, methyl group, or ethyl group, L1 and L2 are an alkylene group, and m and n are 0 or a positive integer, wherein m+n is 0 to 20.Type: GrantFiled: October 21, 2016Date of Patent: April 9, 2019Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro Nagasawa, Kentaro Ohmori
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Publication number: 20180305488Abstract: An optical waveguide-forming composition: 100 parts by mass of a reactive silicone compound (a) composed of a polycondensate of a diarylsilicic acid compound A of Formula [1] Ar1 and Ar2 are a phenyl, naphthyl or a biphenyl group optionally substituted, and an alkoxy silicon compound B of Formula [2] Ar3—Si(OR1)aR23-a??[2] Ar3 is a phenyl, naphthyl or biphenyl group having at least one group having a polymerizable double bond, R1 is methyl or ethyl group, R2 is methyl, ethyl, or vinylphenyl group, and a is 2 or 3, and 1 part by mass to 200 parts by mass of a di(meth)acrylate compound (b) of Formula [3]. R3 and R4 are a hydrogen atom or methyl group, R5 is a hydrogen atom, methyl group, or ethyl group, L1 and L2 are an alkylene group, and m and n are 0 or a positive integer, wherein m+n is 0 to 20.Type: ApplicationFiled: October 21, 2016Publication date: October 25, 2018Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro NAGASAWA, Kentaro OHMORI
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Publication number: 20180244852Abstract: There is provided a polymerizable composition suitable to produce a molded product in which high refractive index is maintained, and dimensional change and a transmittance change further caused by a high-temperature heat history can be suppressed. A polymerizable composition comprising (a) 100 parts by mass of a specific reactive silsesquioxane compound and (b) 10 to 2,000 parts by mass of a specific fluorene compound, and a cured product obtained by curing the polymerizable composition, and a resin lens manufactured from the polymerizable composition.Type: ApplicationFiled: September 1, 2016Publication date: August 30, 2018Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Kei YASUI, Takehiro NAGASAWA, Taku KATO, Keisuke SHUTO
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Publication number: 20180079849Abstract: A polymerizable composition suitable for use in producing molded articles that can maintain a high refractive index, and can be prevented from cracking, peeling from a support, and dimensional changes due to a high-temperature thermal history. A polymerizable composition including (a) 100 parts by mass of a specific reactive silsesquioxane compound, (b) 10 to 500 parts by mass of a specific fluorene compound, and (c) 0.1 to 50 parts by mass of a polymer having a weight average molecular weight of 5,000 to 100,000; a cured product obtained by polymerizing the polymerizable composition; and a high-refractive-index resin lens material including the polymerizable composition.Type: ApplicationFiled: April 11, 2016Publication date: March 22, 2018Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Takehiro NAGASAWA, Sayoko TADOKORO