Teijin Limited

Mitsubishi Paper Mills Limited

Toho Tenax Co., Ltd.

Teijin Carbon Europe Gmbh

Sakata Inx Corporation

Toru Kaneko

Masanori Nagoshi

Koji Idei

Tetsuya Nishi

Yosuke Nakamura

Takaya Suzuki

Hidekazu Yoshikawa

Hironori Kawamoto

Shuhei Yoshida

Satoshi Kaneko

Masahiro Kawasaki

Hiroshi Ikeda

Masatomo Teshima

Yutaka Yagi

Takeshi Naito

Takashi Ito

Tetsuya Akamatsu

Katsuyuki Hagihara

Koji Suzuki

Naoki Omi

Keishiro Hishinuma

Tadashi Yamaji

Kazutoshi Iida

Shusuke Sanai

Hideki Takada

Atsushi Kawakami

Hiroshi Numata

Daichi Miyake

Kohei Osaki

Matthias Schubert

Mizuki Sasaki

Takeshi Shimada

Yasuyuki Yokoe

Jirou Sadanobu

Masaru Sato

Kaori Nagakura

Kouhei Shimoyama

Amane Yamamoto

Yuko Okano

Masayuki Takishiro

The present invention provides a prepreg including a fiber-reinforced substrate composed of a carbon fiber and an epoxy resin composition with which the fiber-reinforced substrate is partially or wholly impregnated, the prepreg being characterized in that the epoxy resin composition includes an epoxy resin, dicyandiamide, and an aromatic amine having a structure of Chemical Formula (1) in which at least one substituent other than a hydrogen atom is included in an ortho position with respect to an amino group.

Prepreg and carbon fiber-reinforced composite material

The present invention provides a self-adhesive prepreg which is characterized by comprising: a base prepreg that is composed of reinforcing fibers and a thermosetting resin composition (I), some or all of which is impregnated into a reinforcing fiber layer that is formed of the reinforcing fibers; an adhesive layer that is composed of a nonwoven fabric which is laminated on at least one surface of the base prepreg so as to be integrated with the base prepreg and a thermosetting resin composition (II) which is laminated on the surface of the nonwoven fabric so as to be integrated with the nonwoven fabric.

Self-adhesive prepreg and method for producing same

An object of the present invention is to provide a stitched fiber-reinforced substrate material capable of suppressing the formation of microcracks in a fiber reinforced composite material. The stitched fiber-reinforced substrate material of the present invention is a stitched fiber-reinforced substrate material formed by stitching reinforcement fiber sheets made of reinforcement fibers using stitching yarns, to which an organic compound having a polar group is adhered. The organic compound having a polar group is preferably a compound having a polyoxyalkylene structure, and also preferably a compound having an epoxy group. The organic compound having a polar group is preferably adhered in an amount of 0.1 to 10 wt % with respect to the mass of the stitching yarn.

Stitched fiber-reinforced substrate material, preform material, fiber reinforced composite material, and manufacturing method for same

An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2):&#x2264;3&#x2003;&#x2003;(1)TS&#xd7;&#x3e;6.0&#xd7;10&#x2003;&#x2003;(2)

Carbon fiber bundle, prepreg, and fiber-reinforced composite material

A printing paper having a base paper and an outermost coating layer is provided, and satisfies at least one of the following characteristics (I), (II) and (III): (I) when an aqueous solution having a surface tension of 20 mN/m is dropped on the side having the outermost coating layer of the printing paper, a contact angle between the droplet and the outermost coating layer is 40&#xb0; or more and 65&#xb0; or less; (II) for the side having the outermost coating layer of the printing paper, a transfer amount of an aqueous solution having a surface tension of 20 mN/m at a contact time of 1 second as determined by the Bristow method is 5.0 ml/mor more and 12.0 ml/mor less; and (III) on the surface of the outermost coating layer of the printing paper, a maximum peak value of specular reflection light quantity of a point image is 2,000 or more and 30,000 or less.

Printing paper

The present invention provides a heat-curable resin composition, which comprises (1) a heat-curable resin mixture comprising a heat-curable resin (a) and thickener particles (b) and exhibiting a viscosity (150&#xb0; C.) after having been held at a temperature of 150&#xb0; C. for 30 seconds that is a viscosity (S), and (2) a curing agent, and is characterized in that the heat-curable resin composition exhibits a lowest viscosity (R) at 80-120&#xb0; C., the lowest viscosity (R) is 0.1-10 Pa&#xb7;s, and the viscosity (S) and lowest viscosity (R) satisfy the relationship of formula (1):5&#x3c;&#x3c;200&#x2003;&#x2003;formula (1).

Heat-curable resin composition, prepreg, and method for producing fiber-reinforced composite using each of same

The present invention provides an epoxy resin composition comprising at least the following component [A], component [B] and component [C], the epoxy resin composition being characterized in that: the mixture of component [A] and component [B] is a mixture that, when temperature is increased at 2&#xb0; C./min, begins to thicken at temperature (T) and completes thickening at temperature (T), temperature (T) being 80-110&#xb0; C. and temperature (T) and temperature (T) satisfying the relationship of expression (1) 5&#xb0; C.&#x2264;(T&#x2212;T)&#x2264;20&#xb0; C. expression (1); and the mixture of component [A] and component [C] is a mixture that, when temperature is increased at 2&#xb0; C./min, begins to cure at temperature (T), temperature (T) and temperature (T) satisfying the relationship of expression (2) 5&#xb0; C.&#x2264;(T&#x2212;T)&#x2264;80&#xb0; C. expression (2).

Epoxy resin composition, prepreg, carbon fiber-reinforced composite material, and manufacturing methods therefor

The present invention relates to a coated printing paper for an industrial inkjet printing press having a base paper, and at least two layers of coating layers arranged on at least one surface of the base paper; a first coating layer that is located at a farthest position from the base paper among the at least two layers of coating layers containing a pigment and a binder as main components, a peak existing in the range of 0.010 &#x3bc;m to 0.030 &#x3bc;m in a pore size distribution curve thereof, at least one type of the pigment thereof being ground calcium carbonate, and the content thereof being 60 parts by mass or more per 100 parts by mass total of all pigment(s) contained in the first coating layer; and a second coating layer that is in contact with the first coating layer among the at least two layers of coating layers containing a pigment and a binder as main components, and a peak existing in the range of 0.080 &#x3bc;m to 0.300 &#x3bc;m in a pore size distribution curve thereof.

Coated printing paper for industrial inkjet printing press and method of producing printed material

Provided is a printing coated paper which is advantageous not only in that the coated paper has offset printability and causes no mottling in the printed area even in ink jet printing, but also in that the coated paper exhibits excellent rubbing resistance with respect to the printed area and excellent print density of a dye ink. The task of the present invention is achieved by a printing coated paper having a coating layer comprised mainly of a pigment and a binder formed on at least one side of a base paper, wherein the base paper is a treated base paper which has been subjected to size press using a treatment solution containing at least one member selected from a cationic resin and a water-soluble multivalent cation salt, wherein the total applied amount per each side of the at least one member selected from a cationic resin and a water-soluble multivalent cation salt, in terms of the solids content, is in the range of from 0.1 to 5.0 g/m, and wherein the at least one pigment in the coating layer is ground calcium carbonate having an average particle diameter of 0.1 to 0.28 &#x3bc;m, wherein the amount of the ground calcium carbonate having an average particle diameter of 0.1 to 0.28 &#x3bc;m contained in the coating layer is in the range of 60 parts by mass or more, relative to 100 parts by mass of the total of the pigment(s) in the coating layer.

Printing coated paper and method for producing a printed material using the same

The present invention provides coated printing paper for industrial inkjet printing presses comprising base paper and, formed on at least one surface of the base paper, a coating layer containing a pigment and a binder as major components, wherein the base paper contains precipitated calcium carbonate which is aggregates of spindle-like precipitated calcium carbonate having an average minor-axis length of 0.3 &#x3bc;m to 0.4 &#x3bc;m and a ratio of average major-axis length/average minor-axis length of 2.0 to 7.0 and which has an average secondary particle diameter of 3.0 &#x3bc;m to 5.5 &#x3bc;m, and further contains at least one material selected from the group consisting of a cationic resin and a water-soluble salt of a polyvalent cation, and the coating layer contains ground calcium carbonate having an average particle diameter of 0.1 &#x3bc;m to 0.28 &#x3bc;m in an amount of 60 parts by mass or greater based on 100 parts by mass of the total pigment contained in the coating layer.

Coated printing paper for industrial inkjet printing press

Provided is an active energy ray-curable offset printing ink composition that can prevent occurrence of a slurring phenomenon. The active energy ray-curable offset printing ink composition includes a compound having an ethylenically unsaturated bond, a photopolymerization initiator, a colorant, and an extender pigment. The extender pigment has a median diameter (d50) of 1.0 to 2.0 &#x3bc;m measured by laser diffractometry. Printing with a reduced slurring phenomenon can be achieved using such an active energy ray-curable offset printing ink composition.

Active energy ray-curable offset printing ink composition

A carbon fiber bundle includes carbon fibers and a copolymerized polyolefin attached to the surface of the carbon fibers. The copolymerized polyolefin contains an aromatic vinyl compound and an acid and/or acid anhydride as copolymerization components. The amount of the copolymerized polyolefin attached is 0.01 to 10 parts by mass per 100 parts by mass of the carbon fiber bundle. The carbon fiber bundle may be used or contained in a random mat, a composite material, and various molded articles.

Carbon fiber bundle, method for producing the same, and molded article made thereof

The invention provides coated printing paper having base paper and on at least one surface of the base paper, a coating layer containing a pigment and a binder as main components, wherein the base paper contains calcium carbonate, the coating layer contains ground calcium carbonate as a pigment in an amount of 50 parts by mass or more relative to 100 parts by mass of the total of the pigment(s) in the coating layer, the base paper and/or the coating layer contains a calcium compound other than calcium carbonate, and the content of calcium derived from the calcium compound is 3 mmol to 60 mmol, both inclusive, in terms of calcium ions per 1 mof the base paper and/or the coating layer.

Coated printing paper and method for forming printed images

The invention provides lightweight coated paper having good offset printability. The invention provides lightweight coated paper having good printability in commercial printing utilizing the ink jet recording system. The lightweight coated paper of the invention includes base paper, and one or more coating layers disposed on at least one side of the base paper. The coating layer includes a pigment and a binder. The total coating weight of the coating layer(s) is not more than 7.5 g/mper side of the base paper. The coating layer contains a polycondensate of an aliphatic monoamine or an aliphatic polyamine and an epihalohydrin compound, and a water-soluble polyvalent cation salt. The content of the water-soluble polyvalent cation salt in the coating layer is 0.3 g/mto 1.0 g/mper side of the base paper. The content of the polycondensate of an aliphatic monoamine or an aliphatic polyamine and an epihalohydrin compound in the coating layer is 15 mass % to less than 100 mass % relative to the content of the water-soluble polyvalent cation salt.

Lightweight coated paper and print production method using the same

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Tokyo, Japan

Toru Kaneko