Patents by Inventor Haruki Koyama
Haruki Koyama 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: 20230416556Abstract: A laminate having excellent moldability and including an acrylic-based resin film is provided. A method for producing a laminate having a specific crack elongation, includes a step (A) of forming, on at least one side of a specific acrylic-based resin film, a hard coat layer that contains a urethane acrylate resin, and a step (B) of forming, on the hard coat layer obtained in the step (A), a low refractive index layer that contains, in an amount of not less than 40%, hollow fine silica particles having a particle size of less than 100 nm and that contains an acrylate-based resin.Type: ApplicationFiled: September 1, 2023Publication date: December 28, 2023Applicant: KANEKA CORPORATIONInventors: Hanako Hasebe, Haruki Koyama, Yukihiro Shimamoto
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Publication number: 20230340218Abstract: Provided is a laminate that has excellent moldability and excellent wear resistance, and that contains an acrylic-based resin film. Excellent mouldability and wear resistance can be attained by providing a laminate including a specific acrylic-based resin film, and a specific ultraviolet-curable hard coat layer that is laminated on at least one side of the acrylic-based resin film. The laminate has a specific crack elongation and exhibits a ?haze of not more than 1.0% in a steel wool wear test at 50 g/cm2 and 5 reciprocating motions.Type: ApplicationFiled: June 23, 2023Publication date: October 26, 2023Applicant: KANEKA CORPORATIONInventors: Haruki Koyama, Hanako Hasebe, Yukihiro Shimamoto
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Patent number: 11760855Abstract: An acrylic resin film is provided that may include graft copolymer particles (A) with a multilayer structure and graft copolymer particles (B) with a multilayer structure, wherein the graft copolymer particles (A) may have an average particle size in the range of 20 to 150 nm, the graft copolymer particles (B) may have a larger average particle size than the graft copolymer particles (A). The graft copolymer particles (A) may include a cross-linked elastomer (A1) and a graft polymer layer (A2), the graft polymer layer (A2) being closer to a surface layer than the cross-linked elastomer (A1). Further, a constituent unit may be derived from an acrylate with an alkyl ester moiety having two or more carbon atoms constitutes 8% or less by mass of the graft polymer layer (A2), the graft copolymer particles (B) may contain a cross-linked elastomer (B1).Type: GrantFiled: September 17, 2020Date of Patent: September 19, 2023Assignee: KANEKA CORPORATIONInventors: Haruki Koyama, Hanako Hasebe, Katsumi Yamaguchi, Yukihiro Shimamoto
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Patent number: 10933614Abstract: An acrylic resin composition includes an acrylic resin and a graft copolymer. The graft copolymer includes an inner layer and an outer layer. The inner layer is a soft polymer (B) having, as structural units, a monomer mixture (b) containing 40 to 99 wt % of an alkyl acrylate ester, 1 to 60 wt % of benzyl (meth)acrylate, and 0 to 40 wt % of another monomer and 0.1 to 5 parts by weight of a polyfunctional monomer; and the outer layer is a hard polymer (C) having, as structural units, a monomer mixture (c) containing 60 to 100 wt % of an alkyl methacrylate ester, 0 to 10 wt % of benzyl (meth)acrylate, and 40 to 0 w % of another monomer and 0 to 10 parts by weight of a polyfunctional monomer.Type: GrantFiled: October 1, 2018Date of Patent: March 2, 2021Assignee: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Haruki Koyama, Hiroki Sawada, Nagayoshi Adachi
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Publication number: 20210002437Abstract: An acrylic resin film is provided that may include graft copolymer particles (A) with a multilayer structure and graft copolymer particles (B) with a multilayer structure, wherein the graft copolymer particles (A) may have an average particle size in the range of 20 to 150 nm, the graft copolymer particles (B) may have a larger average particle size than the graft copolymer particles (A). The graft copolymer particles (A) may include a cross-linked elastomer (A1) and a graft polymer layer (A2), the graft polymer layer (A2) being closer to a surface layer than the cross-linked elastomer (A1). Further, a constituent unit may be derived from an acrylate with an alkyl ester moiety having two or more carbon atoms constitutes 8% or less by mass of the graft polymer layer (A2), the graft copolymer particles (B) may contain a cross-linked elastomer (B1).Type: ApplicationFiled: September 17, 2020Publication date: January 7, 2021Applicant: KANEKA CORPORATIONInventors: Haruki Koyama, Hanako Hasebe, Katsumi Yamaguchi, Yukihiro Shimamoto
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Patent number: 10578773Abstract: Disclosed herein are an optical resin composition whose orientation birefringence and photoelastic birefringence are both very low and which has high transparency and which provides a film having few surface defects and excellent mechanical strength, and a film comprising the optical resin composition. Also disclosed herein is a film that has optical isotropy and excellent transparency even after stretching. The optical resin composition contains a thermoplastic resin and a multistep-polymerized graft copolymer obtained by polymerizing, in the presence of crosslinked polymer-containing particles formed by polymerizing a monomer mixture containing a monomer represented by the following formula (4) and a polyfunctional monomer, a monomer mixture containing a monomer represented by the following formula (4) and another monofunctional monomer copolymerizable therewith.Type: GrantFiled: November 27, 2014Date of Patent: March 3, 2020Assignee: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Haruki Koyama
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Patent number: 10479886Abstract: An optical resin composition from which a film with improved adhesion to a polyvinyl alcohol-based film and improved flex resistance can be obtained while keeping high film transparency. The optical resin composition includes: 99 to 50% by weight of an acrylic resin having a glass transition temperature of not lower than 110° C.; and 1 to 50% by weight of a particulate (meth)acrylic multilayer structure graft copolymer containing: an innermost layer made of a polymer containing a methacrylic acid ester as a first monomer; a middle layer made of a polymer containing, as a second monomer, an acrylic acid alkyl ester having an alkyl group with 4 to 12 carbon atoms; and an outermost layer made of a polymer containing a methacrylic acid ester as a third monomer. A graft ratio of the (meth)acrylic multilayer structure graft copolymer is not less than 110%.Type: GrantFiled: December 29, 2016Date of Patent: November 19, 2019Assignee: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Haruki Koyama, Tomoki Hiiro
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Patent number: 10392463Abstract: A resin composition includes an acrylic resin and a graft copolymer having a gel content of 65% to 84%, wherein the graft copolymer is a multistage-polymerized graft copolymer obtained by a multistage polymerization including the polymerization stages (I) to (III). In the polymerization stage (I), a first monomer mixture and a polyfunctional monomer are polymerized in a presence of a primary alkyl mercaptan-based chain transfer agent and/or a secondary alkyl mercaptan-based chain transfer agent to obtain a first hard polymer. In the polymerization stage (II), a second monomer mixture and a polyfunctional monomer are polymerized to obtain a soft polymer. In the polymerization stage (III), a third monomer mixture and a polyfunctional monomer are polymerized to obtain a second hard polymer.Type: GrantFiled: September 1, 2017Date of Patent: August 27, 2019Assignee: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Nobuyoshi Maizuru, Mitsuru Nakamura, Haruki Koyama
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Publication number: 20190031845Abstract: An acrylic resin composition includes an acrylic resin and a graft copolymer. The graft copolymer includes an inner layer and an outer layer. The inner layer is a soft polymer (B) having, as structural units, a monomer mixture (b) containing 40 to 99 wt % of an alkyl acrylate ester, 1 to 60 wt % of benzyl (meth)acrylate, and 0 to 40 wt % of another monomer and 0.1 to 5 parts by weight of a polyfunctional monomer; and the outer layer is a hard polymer (C) having, as structural units, a monomer mixture (c) containing 60 to 100 wt % of an alkyl methacrylate ester, 0 to 10 wt % of benzyl (meth)acrylate, and 40 to 0 w % of another monomer and 0 to 10 parts by weight of a polyfunctional monomer.Type: ApplicationFiled: October 1, 2018Publication date: January 31, 2019Applicant: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Haruki Koyama, Hiroki Ueda, Nagayoshi Adachi
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Publication number: 20170362368Abstract: A resin composition includes an acrylic resin and a graft copolymer having a gel content of 65% to 84%, wherein the graft copolymer is a multistage-polymerized graft copolymer obtained by a multistage polymerization including the polymerization stages (I) to (III). In the polymerization stage (I), a first monomer mixture and a polyfunctional monomer are polymerized in a presence of a primary alkyl mercaptan-based chain transfer agent and/or a secondary alkyl mercaptan-based chain transfer agent to obtain a first hard polymer. In the polymerization stage (II), a second monomer mixture and a polyfunctional monomer are poloymerized to obtain a soft polymer. In the polymerization stage (III), a third monomer mixture and a polyfunctional monomer are polymerized to obtain a second hard polymer.Type: ApplicationFiled: September 1, 2017Publication date: December 21, 2017Applicant: Kaneka CorporationInventors: Fuminobu Kitayama, Nobuyoshi Maizuru, Mitsuru Nakamura, Haruki Koyama
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Patent number: 9803078Abstract: Disclosed herein are an optical resin composition whose orientation birefringence and photoelastic birefringence are both very low and which has high transparency and which provides a film having few surface defects, high heat stability, high solvent resistance, and excellent surface appearance, and a film comprising the optical resin composition. The optical resin composition comprises: a resin (A) having a maleimide unit represented by the formula (5) and a (meth)acrylic ester unit; and a glutarimide acrylic resin (B). The resin composition may further comprise multi-layered particles.Type: GrantFiled: November 27, 2014Date of Patent: October 31, 2017Assignee: KANEKA CORPORATIONInventors: Fuminobu Kitayama, Haruki Koyama
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Publication number: 20170107369Abstract: An optical resin composition from which a film with improved adhesion to a polyvinyl alcohol-based film and improved flex resistance can be obtained while keeping high film transparency. The optical resin composition includes: 99 to 50% by weight of an acrylic resin having a glass transition temperature of not lower than 110° C.; and 1 to 50% by weight of a particulate (meth)acrylic multilayer structure graft copolymer containing: an innermost layer made of a polymer containing a methacrylic acid ester as a first monomer; a middle layer made of a polymer containing, as a second monomer, an acrylic acid alkyl ester having an alkyl group with 4 to 12 carbon atoms; and an outermost layer made of a polymer containing a methacrylic acid ester as a third monomer. A graft ratio of the (meth)acrylic multilayer structure graft copolymer is not less than 110%.Type: ApplicationFiled: December 29, 2016Publication date: April 20, 2017Applicant: Kaneka CorporationInventors: Fuminobu Kitayama, Haruki Koyama, Tomoki Hiiro
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Publication number: 20170031058Abstract: Disclosed herein are an optical resin composition whose orientation birefringence and photoelastic birefringence are both very low and which has high transparency and which provides a film having few surface defects and excellent mechanical strength, and a film comprising the optical resin composition. Also disclosed herein is a film that has optical isotropy and excellent transparency even after stretching. The optical resin composition contains a thermoplastic resin and a multistep-polymerized graft copolymer obtained by polymerizing, in the presence of crosslinked polymer-containing particles formed by polymerizing a monomer mixture containing a monomer represented by the following formula (4) and a polyfunctional monomer, a monomer mixture containing a monomer represented by the following formula (4) and another monofunctional monomer copolymerizable therewith.Type: ApplicationFiled: November 27, 2014Publication date: February 2, 2017Applicant: KANEKA CORPORATIONInventors: Fuminobu KITAYAMA, Haruki KOYAMA
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Publication number: 20170022354Abstract: Disclosed herein are an optical resin composition whose orientation birefringence and photoelastic birefringence are both very low and which has high transparency and which provides a film having few surface defects, high heat stability, high solvent resistance, and excellent surface appearance, and a film comprising the optical resin composition. The optical resin composition comprises: a resin (A) having a maleimide unit represented by the formula (5) and a (meth)acrylic ester unit; and a glutarimide acrylic resin (B). The resin composition may further comprise multi-layered particles.Type: ApplicationFiled: November 27, 2014Publication date: January 26, 2017Inventors: Fuminobu KITAYAMA, Haruki KOYAMA
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Publication number: 20150247013Abstract: Disclosed herein is a film that exhibits well-balanced physical properties such as high surface hardness, excellent transparency, excellent cracking resistance, and excellent anti-whitening on bending when laminated on a plastic molded body, and is therefore suitable for decorative molding applications. The film is an acrylic resin film obtained by forming, into a film, an acrylic resin composition containing an acrylic resin and a rubber-containing graft copolymer, the rubber-containing graft copolymer being obtained by polymerizing monomer components (B-1) to (B-4) in order so that rubber particles obtained by polymerizing (B-1) to (B-3) have an average particle size of 0.2 to 0.4 ?m. The monomer component (B-1) comprises 40 to 100 wt % of an acrylate, 60 to 0 wt % of a monofunctional monomer copolymerizable therewith, and 0.05 to 10 parts by weight of a polyfunctional monomer.Type: ApplicationFiled: September 11, 2013Publication date: September 3, 2015Inventors: Haruki Koyama, Hirotsugu Yamada, Fuminobu Kitayama, Katsumi Yamaguchi