Patents Assigned to Toho Tenax Co., Ltd.
-
Patent number: 11047073Abstract: Method for producing a textile unidirectional fabric, wherein at least one planar layer of multi-filament reinforcement threads arranged parallel to each other are woven with each other over transverse threads, wherein transverse threads having core-sheath structure and titer of 10 to 40 tex are used as transverse threads, wherein transverse threads have a first component, which structures sheath, and second component, which structures core, wherein first component has lower melting temperature than second component, first component is meltable thermoplastic polymer material and, via first component of transverse threads, adjacently arranged multi-filament reinforcement threads are connected to each other by hot melting, wherein alleys are formed in unidirectional fabric by interweaving multi-filament reinforcement threads together with transverse threads, by means of which a permeability of 10 to 600 l/dm2/min can be established.Type: GrantFiled: March 29, 2018Date of Patent: June 29, 2021Assignees: TOHO TENAX EUROPE GMBH, TOHO TENAX CO., LTD.Inventors: Ronny Wockatz, Dirk Ortmanns, Shuhei Yoshida, Yosuke Nakamura, Hidekazu Yoshikawa
-
Patent number: 10988862Abstract: A carbon fiber manufacturing method includes joining first and second target fiber bundles with a joining fiber bundle, and carbonizing the joined bundles by feeding them through one or more carbonization furnaces. The joining includes forming an overlap between a first end of the joining fiber bundle and a second end of the first target fiber bundle and jetting a fluid to the overlap to form a first entangled portion, and forming an overlap between a second end of the joining fiber bundle and a first end of the second target fiber bundle and jetting a fluid to the overlap to form a second entangled portion.Type: GrantFiled: January 31, 2017Date of Patent: April 27, 2021Assignee: TOHO TENAX CO., LTD.Inventors: Fumio Akiyama, Tadayuki Aoyama, Ichiro Kitano
-
Patent number: 10927226Abstract: The invention provides a prepreg comprising: a primary prepreg composed of reinforcing fibers and a resin composition (I) impregnating the interior of a reinforcing fiber layer formed from these fibers; and a surface layer composed of a resin composition (II) formed on one or both sides of the primary prepreg; wherein the resin composition (I) is an epoxy resin composition [B] containing at least an epoxy resin and a thermoplastic resin, and the resin composition (II) is an epoxy resin composition [A] containing at least an epoxy resin and conductive particles.Type: GrantFiled: September 25, 2013Date of Patent: February 23, 2021Assignee: TOHO TENAX CO., LTD.Inventors: Takaya Suzuki, Hajime Sakamoto, Toyoaki Ishiwata, Yoshitaka Umemoto
-
Patent number: 10875976Abstract: 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° C.) after having been held at a temperature of 150° 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° C., the lowest viscosity (R) is 0.1-10 Pa·s, and the viscosity (S) and lowest viscosity (R) satisfy the relationship of formula (1): 5<S/R<200??formula (1).Type: GrantFiled: November 21, 2014Date of Patent: December 29, 2020Assignee: TOHO TENAX CO., LTD.Inventor: Toru Kaneko
-
Patent number: 10647849Abstract: 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° C./min, begins to thicken at temperature (T1) and completes thickening at temperature (T2), temperature (T1) being 80-110° C. and temperature (T1) and temperature (T2) satisfying the relationship of expression (1) 5° C.?(T2?T1)?20° C. expression (1); and the mixture of component [A] and component [C] is a mixture that, when temperature is increased at 2° C./min, begins to cure at temperature (T3), temperature (T1) and temperature (T3) satisfying the relationship of expression (2) 5° C.?(T3?T1)?80° C. expression (2). Component [A]: epoxy resin Component [B]: thickening particle Component [C]: curing agent.Type: GrantFiled: March 30, 2016Date of Patent: May 12, 2020Assignee: TOHO TENAX CO., LTD.Inventors: Toru Kaneko, Yuko Okano
-
Patent number: 10544274Abstract: A prepreg includes conductive fibers impregnated with a matrix resin, the prepreg having a conductive region where a conductive material is dispersed in the resin. In the present invention, a resin layer composed of at least the matrix resin preferably is present on one or both surfaces of a conductive fiber layer composed of at least the conductive fibers, and the conductive region is present at least in the resin layer. In addition, the above-described conductive region preferably is present continuously in the thickness direction. The conductive region preferably is a conductive region where the conductive material is dispersed in the matrix resin, and the resin in the conductive region preferably forms a continuous phase with the matrix resin in other regions. A volume resistivity of the conductive region preferably is 1/1,000 or less of that of other regions of the matrix resin.Type: GrantFiled: July 24, 2015Date of Patent: January 28, 2020Assignee: Toho Tenax Co., Ltd.Inventors: Kazuma Kurokawa, Hironori Kawamoto, Yoshitaka Umemoto, Akio Nakaishi
-
Patent number: 10316433Abstract: Carbon fibers having a high tensile strength satisfy the relationship represented by formula (1) and one of the relationships represented by formulas (2) to (5): La?1??(1), La??0.5+0.01×TM when 170?TM?230??(2), La??37.3+0.17×TM when 230<TM?240??(3), La??2.5+0.025×TM when 240<TM?300??(4), and La?2+0.01×TM when 300<TM??(5) where La is a crystal size in nm in a direction parallel to an axis of the fibers measured with by X-ray diffraction, and TM is a tensile modulus in GPa.Type: GrantFiled: March 29, 2016Date of Patent: June 11, 2019Assignee: TOHO TENAX Co., LTD.Inventors: Yoshinori Suzuki, Toshimichi Nakajima
-
Publication number: 20190040551Abstract: A carbon fiber manufacturing method includes joining first and second target fiber bundles with a joining fiber bundle, and carbonizing the joined bundles by feeding them through one or more carbonization furnaces. The joining includes forming an overlap between a first end of the joining fiber bundle and a second end of the first target fiber bundle and jetting a fluid to the overlap to form a first entangled portion, and forming an overlap between a second end of the joining fiber bundle and a first end of the second target fiber bundle and jetting a fluid to the overlap to form a second entangled portion.Type: ApplicationFiled: January 31, 2017Publication date: February 7, 2019Applicant: TOHO TENAX CO., LTD.Inventors: Fumio AKIYAMA, Tadayuki AOYAMA, Ichiro KITANO
-
Patent number: 10047478Abstract: The present invention provides a prepreg comprising: a primary pre-pregnant made of a reinforced fiber substrate and an epoxy resin composition containing at least epoxy resin and thermoplastic resin impregnated into the reinforcing fiber that forms the reinforced fiber substrate; and a surface layer made of epoxy resin composition containing at least an epoxy resin and an epoxy resin-soluble thermoplastic resin that dissolves in the epoxy resin, the surface layer being formed on one or both surfaces of the primary prepreg; the prepreg being characterized in that only one of either the epoxy resin composition of the primary prepreg or the epoxy resin composition of the surface layer contains a hardening agent for an epoxy resin.Type: GrantFiled: March 21, 2012Date of Patent: August 14, 2018Assignee: TOHO TENAX CO., LTDInventors: Takaya Suzuki, Toyoaki Ishiwata, Yoshinori Suzuki, Hiroshi Numata
-
Publication number: 20180208729Abstract: A prepreg includes conductive fibers impregnated with a matrix resin, the prepreg having a conductive region where a conductive material is dispersed in the resin. In the present invention, a resin layer composed of at least the matrix resin preferably is present on one or both surfaces of a conductive fiber layer composed of at least the conductive fibers, and the conductive region is present at least in the resin layer. In addition, the above-described conductive region preferably is present continuously in the thickness direction. The conductive region preferably is a conductive region where the conductive material is dispersed in the matrix resin, and the resin in the conductive region preferably forms a continuous phase with the matrix resin in other regions. A volume resistivity of the conductive region preferably is 1/1,000 or less of that of other regions of the matrix resin.Type: ApplicationFiled: July 24, 2015Publication date: July 26, 2018Applicant: Toho Tenax Co., Ltd.Inventors: Kazuma KUROKAWA, Hironori KAWAMOTO, Yoshitaka UMEMOTO, Akio NAKAISHI
-
Publication number: 20180105690Abstract: 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° C./min, begins to thicken at temperature (T1) and completes thickening at temperature (T2), temperature (T1) being 80-110° C. and temperature (T1) and temperature (T2) satisfying the relationship of expression (1) 5° C.?(T2?T1)?20° C. expression (1); and the mixture of component [A] and component [C] is a mixture that, when temperature is increased at 2° C./min, begins to cure at temperature (T3), temperature (T1) and temperature (T3) satisfying the relationship of expression (2) 5° C.?(T3?T1)?80° C. expression (2).Type: ApplicationFiled: March 30, 2016Publication date: April 19, 2018Applicant: TOHO TENAX CO., LTD.Inventors: Toru KANEKO, Yuko OKANO
-
Publication number: 20180051399Abstract: Carbon fibers having a high tensile strength satisfy the relationship represented by formula (1) and one of the relationships represented by formulas (2) to (5): La?1??(1), La??0.5+0.01×TM when 170?TM?230??(2), La??37.3+0.17×TM when 230<TM?240??(3), La??2.5+0.025×TM when 240<TM?300??(4), and La?2+0.01×TM when 300<TM??(5) where La is a crystal size in nm in a direction parallel to an axis of the fibers measured with by X-ray diffraction, and TM is a tensile modulus in GPa.Type: ApplicationFiled: March 29, 2016Publication date: February 22, 2018Applicant: TOHO TENAX CO.,LTD.Inventors: Yoshinori SUZUKI, Toshimichi NAKAJIMA
-
Patent number: 9745671Abstract: A carbonization method of carbonizing precursor fibers that are being conveyed includes carbonization performed using a plurality of carbonization furnaces for heating fibers arranged in the direction in which the fibers are conveyed. The plurality of carbonization furnaces include at least one carbonization furnace that heats the fibers using plasma when the fibers are passing through the inside of the at least one carbonization furnace. A carbon fiber production method includes a carbonization process of carbonizing precursor fibers that are being conveyed. The carbonization process is performed with the above carbonization method.Type: GrantFiled: July 24, 2014Date of Patent: August 29, 2017Assignee: TOHO TENAX CO., LTD.Inventor: Yoshinori Suzuki
-
Publication number: 20160280871Abstract: 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° C.) after having been held at a temperature of 150° 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° C., the lowest viscosity (R) is 0.1-10 Pa·s, and the viscosity (S) and lowest viscosity (R) satisfy the relationship of formula (1): 5<S/R<200??formula (1).Type: ApplicationFiled: November 21, 2014Publication date: September 29, 2016Applicant: TOHO TENAX CO., LTD.Inventor: Toru KANEKO
-
Publication number: 20160130732Abstract: A carbonization method of carbonizing precursor fibers that are being conveyed includes carbonization performed using a plurality of carbonization furnaces for heating fibers arranged in the direction in which the fibers are conveyed. The plurality of carbonization furnaces include at least one carbonization furnace that heats the fibers using plasma when the fibers are passing through the inside of the at least one carbonization furnace. A carbon fiber production method includes a carbonization process of carbonizing precursor fibers that are being conveyed. The carbonization process is performed with the above carbonization method.Type: ApplicationFiled: July 24, 2014Publication date: May 12, 2016Applicant: TOHO TENAX CO., LTD.Inventor: Yoshinori SUZUKI
-
Patent number: 9181640Abstract: Disclosed is a carbon-fiber chopped strand, and a manufacturing method of the same. The carbon-fiber chopped strand is composed of single filaments composed of 30,000-120,000 carbon fibers, and a sizing agent content 1-10% by weight that bundles the single filaments; the ratio of maximum diameter (Dmax) in the cross section and minimum diameter (Dmin) is 1.0-1.8, a length along a fiber direction is 3-10 mm, and a repose angle of 10-30°.Type: GrantFiled: February 28, 2011Date of Patent: November 10, 2015Assignee: TOHO TENAX CO., LTD.Inventors: Hiroshi Tsunekawa, Takao Saeki, Akio Yoshida
-
Patent number: 8916310Abstract: A conductive sheet comprises an aromatic polyamide pulp, a fluoroplastic fused to the aromatic polyamide pulp, and a carbon-based conductive material; wherein the conductive sheet has a static contact angle of water on a first surface that is greater than the static contact angle of water on a second surface that in the opposite surface to the first surface, and the difference between the static contact angle of water on the first surface and the static contact angle of water on the second surface is 20°-180°; or wherein the injection pressure of water on the first surface of the conductive sheet is less than the injection pressure of water on the second surface that is the opposite surface to the first surface, and the difference between the injection pressure of water on the first surface and the injection pressure of water on the second surface is 20-50 kPa.Type: GrantFiled: August 24, 2011Date of Patent: December 23, 2014Assignee: Toho Tenax Co., Ltd.Inventors: Kazuma Kurokawa, Tetsuya Akamatsu
-
Publication number: 20130157171Abstract: A conductive sheet comprises an aromatic polyamide pulp, a fluoroplastic fused to the aromatic polyamide pulp, and a carbon-based conductive material; wherein the conductive sheet has a static contact angle of water on a first surface that is greater than the static contact angle of water on a second surface that in the opposite surface to the first surface, and the difference between the static contact angle of water on the first surface and the static contact angle of water on the second surface is 20°-180°; or wherein the injection pressure of water on the first surface of the conductive sheet is less than the injection pressure of water on the second surface that is the opposite surface to the first surface, and the difference between the injection pressure of water on the first surface and the injection pressure of water on the second surface is 20-50 kPa.Type: ApplicationFiled: August 24, 2011Publication date: June 20, 2013Applicant: TOHO TENAX CO., LTD.Inventors: Kazuma Kurokawa, Tetsuya Akamatsu
-
Patent number: 8236273Abstract: There is disclosed a method of producing a pre-oxidation fiber in the production of the pre-oxidation fiber by subjecting a polyacrylic precursor fiber to pre-oxidation processing in an oxidizing atmosphere, including shrinking the precursor fiber as a pretreatment of pre-oxidation at a load of 0.58 g/tex or less in the temperature range of 220 to 260° C. under conditions in which the degree of cyclization (I1620/I2240) of the precursor fiber measured by a Fourier transform infrared spectrophotometer (FT-IR) does not exceed 7%, initially-drawing the precursor fiber at a load of 2.7 to 3.5 g/tex in an oxidizing atmosphere at 230 to 260° C. in the ranges of the degree of cyclization of not exceeding 27% and of the density of not exceeding 1.2 g/cm3, and then subjecting the pre-oxidation fiber to pre-oxidation treatment.Type: GrantFiled: December 10, 2008Date of Patent: August 7, 2012Assignee: Toho Tenax Co., Ltd.Inventors: Taro Oyama, Rie Kawahito, Hiroshi Kimura
-
Patent number: 8211537Abstract: The present invention discloses a resin composition and a prepreg produced using the resin composition. The resin composition comprises, as essential components: 100 parts by mass of a component (A) which is an epoxy resin; 41 to 80 parts by mass of a component (B) which is thermoplastic resin particles; and 20 to 50 parts by mass (in terms of diaminodiphenylsulfone) of a component (C) which is diaminodiphenylsulfone microencapsulated with a coating agent. The thermoplastic resin particles (B) comprise at least thermoplastic resin particles (B1) having an average particle diameter of 1 to 50 ?m and thermoplastic resin particles (B2) having an average particle diameter of 2 to 100 ?m at a mass ratio of 3:1 to 1:3. The average particle diameter ratio D2/D1 of the average particle diameter D2 of the thermoplastic resin particles (B2) to the average particle diameter D1 of the thermoplastic resin particles (B1) is 2 or more.Type: GrantFiled: April 11, 2008Date of Patent: July 3, 2012Assignee: Toho Tenax Co., Ltd.Inventors: Yasuyuki Yokoe, Toru Kaneko, Hiroshi Numata, Takeshi Shimada