公开(公告)号：US11492446B2

公开(公告)日：2022-11-08

申请号：US16498227

申请日：2018-03-22

Applicant: KANEKA CORPORATION ,  JAPAN AEROSPACE EXPLORATION AGENCY

Inventor： Yoshio Furukawa ,  Takefumi Furuta ,  Takeshi Chiba ,  Rikio Yokota ,  Yuichi Ishida

IPC: C08G73/12 ,  B29C70/10 ,  C08J5/04 ,  C08J5/12 ,  C08J5/24

Abstract: An object of the present invention is to reduce or eliminate a defect (e.g., a void) by achieving (i) a semipreg and a prepreg each of which allows a reduction in residual volatile component and (ii) methods for producing the semipreg and the prepreg, respectively, and consequently to achieve (iii) a fiber-reinforced composite material which has high heat resistance and superior mechanical strength and a (iv) a method for producing the fiber-reinforced composite material. The present invention attains the above object by providing, for example, a semipreg containing: powders of an imide oligomer; and reinforcement fibers, the imide oligomer being represented by a specific general formula (1).

公开(公告)号：US20190071541A1

公开(公告)日：2019-03-07

申请号：US16184176

申请日：2018-11-08

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Masahiko Miyauchi ,  Rikio Yokota ,  Yuichi Ishida

IPC: C08G73/10 ,  C09D7/20 ,  C09D179/08 ,  C08J5/24 ,  C07D401/14 ,  C07D487/04

Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4′-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.

公开(公告)号：US20230042415A1

公开(公告)日：2023-02-09

申请号：US17955914

申请日：2022-09-29

Applicant: KANEKA CORPORATION ,  JAPAN AEROSPACE EXPLORATION AGENCY

Inventor： Takefumi Furuta ,  Yoshio Furukawa ,  Rikio Yokota ,  Yuichi Ishida

IPC: C08G73/10 ,  C08J5/24 ,  C09D179/08

Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.

公开(公告)号：US20250092172A1

公开(公告)日：2025-03-20

申请号：US18966567

申请日：2024-12-03

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Yoshio Furukawa

IPC: C08F120/14 ,  C08J5/18 ,  G02B1/14 ,  G02B5/30

Abstract: A methacrylic resin includes structural units derived from methyl methacrylate at a ratio of 98% by mass or more, has a triad syndiotacticity of 55% or more, and contains a terminal structure that is derived from a polymerization initiator and is represented by formula (1). The ratio of terminal double bonds to the structural units derived from methyl methacrylate is less than 0.020 mol %. A method for producing the methacrylic resin is provided. In formula (1), each of R1, R2 and R3 independently represents an alkyl group, a substituted alkyl group, an ester group or an amide group, provided that at least one of R1, R2 and R3 represents an ester group or an amide group.

公开(公告)号：US20210340327A1

公开(公告)日：2021-11-04

申请号：US17375685

申请日：2021-07-14

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Yoshio Furukawa ,  Rikio Yokota ,  Yuki Kubota ,  Yuichi Ishida

IPC: C08G73/12 ,  C08J5/24 ,  C09D179/08

Abstract: In order to provide an imide oligomer or the like which can give a cured product exhibiting excellent thermal oxidative stability, an imide oligomer is obtained by reacting together an aromatic tetracarboxylic acid component, an aromatic diamine component, and a terminal capping agent. The imide oligomer contains, in a specified proportion: a compound containing a phenylethynyl group; and a compound containing no carbon-carbon unsaturated bond capable of an addition reaction. One or each of the aromatic tetracarboxylic acid component and the aromatic diamine component contains a component having an asymmetrical and non-planar structure.

公开(公告)号：US10526450B2

公开(公告)日：2020-01-07

申请号：US16184176

申请日：2018-11-08

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Masahiko Miyauchi ,  Rikio Yokota ,  Yuichi Ishida

IPC: C08G73/10 ,  C08J5/24 ,  C07D401/14 ,  C07D487/04 ,  C09D179/08 ,  C09D7/20

Abstract: A terminally modified imide oligomer is represented by a specific formula including a 2-phenyl-4,4′-diaminodiphenylether residue or a 4-phenoxy-1,3-diaminobenzene residue. A varnish is obtained by dissolving the terminally modified imide oligomer. A cured product is obtained by heat-curing the terminally modified imide oligomer, and a film including the cured product has a tensile elongation at break of 10% or more. An imide prepreg is obtained by impregnating fibers with the varnish and then drying the impregnated fibers. A fiber-reinforced composite material is obtained by layering and then heat-curing the imide prepreg.

公开(公告)号：US20250092169A1

公开(公告)日：2025-03-20

申请号：US18968866

申请日：2024-12-04

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Yoshio Furukawa

IPC: C08F20/14

Abstract: A methacrylic resin includes a structural unit derived from methyl methacrylate in a proportion of 98% by mass or more. The methacrylic resin has a weight average molecular weight (Mw) as measured by gel permeation chromatography (GPC) of 400,000 or more, a triad syndiotacticity of 55% to 70% inclusive, a 5% weight loss temperature of 300° C. or higher, and a proportion of terminal double bonds to a structural unit derived from methyl methacrylate of less than 0.015 mol %. A method for producing the methacrylic resin is provided. A resin composition and a dope including the methacrylic resin, a resin film including the methacrylic resin, and a polarizing plate and a display device in which the resin film is used, are provided.

公开(公告)号：US20240384031A1

公开(公告)日：2024-11-21

申请号：US18689992

申请日：2022-09-07

Applicant: KANEKA CORPORATION

Inventor： Takefumi Furuta ,  Mari Yoshitake ,  Yoshio Furukawa

IPC: C08G65/38 ,  C08J5/24 ,  C08J11/28 ,  C08K7/02

Abstract: An object of the present invention is to provide a benzoxazine composition the cured product of which has excellent self-repairability. A benzoxazine composition in accordance with an embodiment of the present invention includes: a product of reaction between a benzoxazine compound and a compound (ii) which contains at least two phenolic hydroxyl groups, and/or a mixture of the compounds (i) and (ii); and a specific crosslinking agent, so that the above problem is solved.

公开(公告)号：US20230193075A1

公开(公告)日：2023-06-22

申请号：US17916496

申请日：2021-03-05

Applicant: KANEKA CORPORATION ,  JAPAN AEROSPACE EXPLORATION AGENCY

Inventor： Takefumi Furuta ,  Yoshio Furukawa ,  Rikio Yokota ,  Yuichi Ishida

IPC: C09D177/00 ,  C09D7/20 ,  C08J5/24 ,  C08J5/04

CPC classification number: C09D177/00 ,  C08J5/04 ,  C08J5/24 ,  C09D7/20

Abstract: The present invention provides an amide acid oligomer which has specific composition and which is capable of providing a cured product having excellent physical properties, in particular, an excellent glass transition temperature, etc.