Kazuya Goto

US Patent:

7591973, Sep 22, 2009

Filed:

Nov 28, 2003

Appl. No.:

10/536275

Inventors:

Tsuneo Takano - Aichi-ken, JP
Akitada Yanase - Aichi-ken, JP
Tadashi Sakai - Tokyo, JP
Kiharu Numata - Aichi-ken, JP
Akihiro Ito - Aichi-ken, JP
Masato Taguchi - Tokyo, JP
Junichi Muramatsu - Aichi-ken, JP
Kazuya Goto - Irvine CA, US
Kazuki Koga - Aichi-ken, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B29C 43/00
B32B 27/04
B32B 27/38
C08L 63/00

US Classification:

264320, 264241, 264299, 264319, 4282974, 4282981, 4282991, 525523

Abstract:

A method for producing a fiber-reinforced composite material plate by heating and pressurizing a prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120 C. and a molding pressure of at least 10 kg/cm. The prepreg is prepared from a reinforcing fiber and an epoxy resin composition. The epoxy resin composition features: an epoxy resin; an amine compound having at least one sulfur atom in the molecule thereof and/or a reaction product of the epoxy resin and the amine compound having at least one sulfur atom in the molecule thereof; a urea compound; and a dicyandiamide. The contents of the sulfur atom and the urea compound in the epoxy resin composition are respectively 0. 2 to 7% by mass and 1 to 15% by mass.

US Patent:

7959838, Jun 14, 2011

Filed:

Mar 27, 2008

Appl. No.:

12/056320

Inventors:

Tsuneo Takano - Toyohashi, JP
Akitada Yanase - Toyohashi, JP
Tadashi Sakai - Tokyo, JP
Kiharu Numata - Toyohashi, JP
Akihiro Ito - Toyohashi, JP
Masato Taguchi - Tokyo, JP
Junichi Muramatsu - Toyohashi, JP
Kazuya Goto - Irvine CA, US
Kazuki Koga - Toyohashi, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B29C 67/00

US Classification:

264136, 264137, 264258

Abstract:

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0. 2 to 7% by mass and 1 to 15% by mass.

US Patent:

8470435, Jun 25, 2013

Filed:

Mar 27, 2008

Appl. No.:

12/056309

Inventors:

Tsuneo Takano - Toyohashi, JP
Akitada Yanase - Toyohashi, JP
Tadashi Sakai - Tokyo, JP
Kiharu Numata - Toyohashi, JP
Akihiro Ito - Toyohashi, JP
Masato Taguchi - Tokyo, JP
Junichi Muramatsu - Toyohashi, JP
Kazuya Goto - Irvine CA, US
Kazuki Koga - Toyohashi, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B32B 27/38
B32B 27/04
C08L 63/00

US Classification:

4282974, 428413, 523428, 523461

Abstract:

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0. 2 to 7% by mass and 1 to 15% by mass.

US Patent:

8486518, Jul 16, 2013

Filed:

Mar 27, 2008

Appl. No.:

12/056315

Inventors:

Tsuneo Takano - Toyohashi, JP
Akitada Yanase - Toyohashi, JP
Tadashi Sakai - Tokyo, JP
Kiharu Numata - Toyohashi, JP
Akihiro Ito - Toyohashi, JP
Masato Taguchi - Tokyo, JP
Junichi Muramatsu - Toyohashi, JP
Kazuya Goto - Irvine CA, US
Kazuki Koga - Toyohashi, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B32B 27/04
B32B 27/26
B32B 27/38
C08L 63/00

US Classification:

4282974, 428413, 523427, 523428, 523433, 523461

Abstract:

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0. 2 to 7% by mass and 1 to 15% by mass.

US Patent:

20060035548, Feb 16, 2006

Filed:

Jul 18, 2003

Appl. No.:

10/521433

Inventors:

Kazuya Goto - Irvine CA, US
Kazuki Koga - Toyohashi-shi, JP
Tadayoshi Saitou - Toyohashi-shi, JP
Akihiro Ito - Toyohashi-shi, JP
Tsuneo Takano - Toyohashi-shi, JP
Kouki Wakabayashi - Otake-shi, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B32B 27/12
B32B 27/04
B32B 27/38

US Classification:

442065000, 442103000, 442179000, 442180000, 156060000

Abstract:

An FRP is produced using a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin is impregnated into the sheet-like reinforcing fiber substrate and also covers one surface of the sheet-like reinforcing fiber substrate, and the matrix resin impregnation ratio is within a range of 35% to 95%; a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin exists on both surfaces of the sheet-like reinforcing fiber substrate, and the portion inside the sheet-like reinforcing fiber substrate into which the matrix resin has not been impregnated is continuous; or a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein at least one surface exhibits a sea-and-island-type pattern comprising resin-impregnated portions (island portions) where the matrix resin is present at the surface and fiber portions (sea portions) where the matrix resin is not present at the surface, the surface coverage ratio of the matrix resin on those surfaces with said a sea-and-island-type pattern is within a range of 3% to 80%, and the weave intersection coverage ratio for the island portions, represented by a formula (1) shown below, is at least 40%, displays excellent external appearance, with no internal voids or surface pinholes, even when molded is conducted using only vacuum pressure. Island portions weave intersection coverage ratio (%)=()×100   (1) (wherein, T represents a number of island portions that cover weave intersections, and Y represents a number of weave intersections within said reinforcing fiber woven fabric on said surface with said sea-and-island-type pattern).

US Patent:

20080185753, Aug 7, 2008

Filed:

Mar 27, 2008

Appl. No.:

12/056312

Inventors:

Tsuneo Takano - Toyohashi-shi, JP
Akitada Yanase - Toyohashi-shi, JP
Tadashi Sakai - Tokyo, JP
Kiharu Numata - Toyohashi-shi, JP
Akihiro Ito - Toyohashi-shi, JP
Masato Taguchi - Tokyo, JP
Junichi Muramatsu - Toyohashi-shi, JP
Kazuya Goto - Irvine CA, US
Kazuki Koga - Toyohashi-shi, JP

Assignee:

Mitsubishi Rayon Co., Ltd. - Tokyo

International Classification:

B29C 53/00
C08G 65/00
C08K 3/26
C08L 63/00

US Classification:

264239, 528403, 524425, 524612

Abstract:

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0.2 to 7% by mass and 1 to 15% by mass.

US Patent:

20090123717, May 14, 2009

Filed:

Oct 2, 2008

Appl. No.:

12/244676

Inventors:

Kazuya Goto - Irvine CA, US
Kazuki Koga - Aichi-ken, JP
Tadayoshi Saitou - Aichi-ken, JP
Akihiro Ito - Aichi-ken, JP
Tsuneo Takano - Aichi-ken, JP
Kouki Wakabayashi - Otake-shi, JP

Assignee:

Mitsubishi Rayon co., Ltd. - Tokyo

International Classification:

B32B 5/10
B32B 37/06

US Classification:

428213, 442179, 156182, 156242

Abstract:

An FRP is produced using a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin is impregnated into the sheet-like reinforcing fiber substrate and also covers one surface of the sheet-like reinforcing fiber substrate, and the matrix resin impregnation ratio is within a range of 35% to 95%; a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin exists on both surfaces of the sheet-like reinforcing fiber substrate, and the portion inside the sheet-like reinforcing fiber substrate into which the matrix resin has not been impregnated is continuous; or a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein at least one surface exhibits a sea-and-island-type pattern comprising resin-impregnated portions (island portions) where the matrix resin is present at the surface and fiber portions (sea portions) where the matrix resin is not present at the surface, the surface coverage ratio of the matrix resin on those surfaces with said a sea-and-island-type pattern is within a range of 3% to 80%, and the weave intersection coverage ratio for the island portions, represented by a formula (1) shown below, is at least 40%, displays excellent external appearance, with no internal voids or surface pinholes, even when molded is conducted using only vacuum pressure.(wherein, T represents a number of island portions that cover weave intersections, and Y represents a number of weave intersections within said reinforcing fiber woven fabric on said surface with said sea-and-island-type pattern).

US Patent:

20110151206, Jun 23, 2011

Filed:

Mar 1, 2011

Appl. No.:

13/037696

Inventors:

Kazuya Goto - Irvine CA, US
Kazuki Koga - Aichi-ken, JP
Tadayoshi Saitou - Aichi-ken, JP
Akihiro Ito - Aichi-ken, JP
Tsuneo Takano - Aichi-ken, JP
Kouki Wakabayashi - Otake-shi, JP

International Classification:

B32B 5/02
B32B 37/00
B32B 3/10
B32B 7/02
B32B 27/04

US Classification:

428196, 156278, 428221, 428213

Abstract:

An FRP is produced using a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin is impregnated into the sheet-like reinforcing fiber substrate and also covers one surface of the sheet-like reinforcing fiber substrate, and the matrix resin impregnation ratio is within a range of 35% to 95%; a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein the matrix resin exists on both surfaces of the sheet-like reinforcing fiber substrate, and the portion inside the sheet-like reinforcing fiber substrate into which the matrix resin has not been impregnated is continuous; or a prepreg comprising reinforcing fiber, a sheet-like reinforcing fiber substrate containing reinforcing fiber, and a matrix resin, wherein at least one surface exhibits a sea-and-island-type pattern comprising resin-impregnated portions (island portions) where the matrix resin is present at the surface and fiber portions (sea portions) where the matrix resin is not present at the surface, the surface coverage ratio of the matrix resin on those surfaces with said a sea-and-island-type pattern is within a range of 3% to 80%, and the weave intersection coverage ratio for the island portions, represented by a formula (1) shown below, is at least 40%, displays excellent external appearance, with no internal voids or surface pinholes, even when molded is conducted using only vacuum pressure.(wherein, T represents a number of island portions that cover weave intersections, and Y represents a number of weave intersections within said reinforcing fiber woven fabric on said surface with said sea-and-island-type pattern).