Patents by Inventor Tadao Yoshikawa
Tadao Yoshikawa 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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Patent number: 9096049Abstract: A metal-clad laminate excellent in isotropy, appearance, bondability between a TLC polymer film and a metallic sheet, and dimensional stability is provided less costly with a first step of thermally compressing the film with the metallic sheet by passing them through a nipping region between heating rolls, and a second step of heat-treating the resultant metal-clad laminate at a temperature not higher than the melting point of the film, wherein the film has thermal expansion coefficient ?L satisfying ?L=?T+? with thickness T, thickness coefficient ? and anisotropy coefficient ? of the film; wherein the coefficient ? is within the range of ?0.08 to ?0.01; the coefficient ? is within the range of ?M+6????M+10 with thermal expansion coefficient ?M of the metallic sheet; and thermal expansion coefficient ?T of the film is within ?M?2??T??M+3 with the coefficient ?M.Type: GrantFiled: August 30, 2010Date of Patent: August 4, 2015Assignee: KURARAY CO., LTD.Inventors: Minoru Onodera, Tadao Yoshikawa
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Patent number: 8771458Abstract: The object of the invention is to provide a wiring board having the uniform quality at a high yield which is produced by hot-pressing and laminating on a wiring board base material a thermotropic liquid crystal polymer which is excellent as a wiring board covering material. The present invention provides a method of making a wiring board comprising: hot-pressing and laminating a thermotropic liquid crystal polymer film on a wiring board base material on the surface of which at least one layer containing a electro-conductive circuit is exposed, characterized by that a viscoelastic characteristic of the thermotropic liquid crystal polymer film is measured at a low frequency within a laminating temperature region and the hot-pressing is carried out at a temperature selected so that the viscoelastic characteristic falls within a predetermined range.Type: GrantFiled: July 19, 2006Date of Patent: July 8, 2014Assignee: Kuraray Co., Ltd.Inventors: Minoru Onodera, Tadao Yoshikawa
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Patent number: 8152950Abstract: A method of making a multi-layer circuit board that has a first film and at least two more films, second and third films, each being made of a thermoplastic polymer capable of forming an optically anisotropic melt phase, the first film having a low melting point, the second and third films having respective melting points higher than the melting point of the first film and at least one of the second and the third films having a circuit pattern thereon, and the first to third films are thermo compressed together with the first film interposed between the second and third films. This method entails causing at least one of the circuit patterns on one of the second and third films to contact an opposing surface of the other of the second and third films through the first film during the thermo compression bonding of the first to third films.Type: GrantFiled: December 23, 2008Date of Patent: April 10, 2012Assignee: Kuraray Co., Ltd.Inventors: Toshinori Tsugaru, Tatsuya Sunamoto, Tadao Yoshikawa
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Publication number: 20100323210Abstract: A metal-clad laminate excellent in isotropy, appearance, bondability between a TLC polymer film and a metallic sheet, and dimensional stability is provided less costly with a first step of thermally compressing the film with the metallic sheet by passing them through a nipping region between heating rolls, and a second step of heat-treating the resultant metal-clad laminate at a temperature not higher than the melting point of the film, wherein the film has thermal expansion coefficient ?L satisfying ?L=?T+? with thickness T, thickness coefficient ? and anisotropy coefficient ? of the film; wherein the coefficient ? is within the range of ?0.08 to ?0.01; the coefficient ? is within the range of ?M+6????M+10 with thermal expansion coefficient ?M of the metallic sheet; and thermal expansion coefficient ?T of the film is within ?M?2??T??M+3 with the coefficient ?M.Type: ApplicationFiled: August 30, 2010Publication date: December 23, 2010Applicant: KURARAY CO. LTD.Inventors: Minoru ONODERA, Tadao Yoshikawa
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Patent number: 7811408Abstract: A metal-clad laminate excellent in isotropy, appearance, bondability between a TLC polymer film and a metallic sheet, and dimensional stability is provided less costly with a first step of thermally compressing the film with the metallic sheet by passing them through a nipping region between heating rolls, and a second step of heat-treating the resultant metal-clad laminate at a temperature not higher than the melting point of the film, wherein the film has thermal expansion coefficient ?L satisfying ?L=?T+? with thickness T, thickness coefficient ? and anisotropy coefficient ? of the film; wherein the coefficient ? is within the range of ?0.08 to ?0.01; the coefficient ? is within the range of ?M+6????M+10 with thermal expansion coefficient ?M of the metallic sheet; and thermal expansion coefficient ?T of the film is within ?M?2??T??M+3 with the coefficient ?M.Type: GrantFiled: October 27, 2005Date of Patent: October 12, 2010Assignee: Kuraray Co., Ltd.Inventors: Minoru Onodera, Tadao Yoshikawa
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Publication number: 20090107624Abstract: A method of making a multi-layer circuit board that has a first film and at least two more films, second and third films, each being made of a thermoplastic polymer capable of forming an optically anisotropic melt phase, the first film having a low melting point, the second and third films having respective melting points higher than the melting point of the first film and at lest one of the second and the third films having a circuit pattern thereon, and the first to third films are thermo compressed together with the first film interposed between the second and third films. This method entails causing at least one of the circuit patterns on one of the second and third films to contact an opposing surface of the other of the second and third films through the first film during the thermo compression bonding of the first to third films.Type: ApplicationFiled: December 23, 2008Publication date: April 30, 2009Applicant: Kuraray Co., Ltd.Inventors: Toshinori TSUGARU, Tatsuya Sunamoto, Tadao Yoshikawa
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Publication number: 20090065240Abstract: The object of the invention is to provide a wiring board having the uniform quality at a high yield which is produced by hot-pressing and laminating on a wiring board base material a thermotropic liquid crystal polymer which is excellent as a wiring board covering material. The present invention provides a method of making a wiring board comprising: hot-pressing and laminating a thermotropic liquid crystal polymer film on a wiring board base material on the surface of which at least one layer containing a electro-conductive circuit is exposed, characterized by that a viscoelastic characteristic of the thermotropic liquid crystal polymer film is measured at a low frequency within a laminating temperature region and the hot-pressing is carried out at a temperature selected so that the viscoelastic characteristic falls within a predetermined range.Type: ApplicationFiled: July 19, 2006Publication date: March 12, 2009Applicant: Kuraray Co., Ltd.Inventors: Minoru Onodera, Tadao Yoshikawa
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Patent number: 7465420Abstract: The method of manufacturing a film of thermotropic liquid crystal polymer includes extruding a thermotropic liquid crystal polymer of a kind in which any one of activation energies Ea1 and Ea2 of a melt viscosity is within the range of 30 to 90 kcal/mol, with the ratio (Ea1/Ea2) of the activation energy Ea1 relative to the activation energy Ea2 being within the range of 1 to 1.7. The activation energies Ea1 and Ea2 are measured by means of a capillary rheometer, including a nozzle of 1 mm in inner diameter and 10 mm in length disposed at an angle of introduction of 90° and a barrel of 9.55 mm in inner diameter, at respective shear rates of 243 seconds?1 and 2432 seconds?1 under a temperature ranging from the temperature [(Tm?10)° C.], which is lower by 10° C. than the melting point [(Tm)° C.] of the thermotropic liquid crystal polymer, to the temperature [(Tm+20)° C.], which is higher by 20° C. than the melting point [(Tm)° C.] of the thermotropic liquid crystal polymer.Type: GrantFiled: May 12, 2004Date of Patent: December 16, 2008Assignee: Kuraray Co., Ltd.Inventors: Tadao Yoshikawa, Tatsuya Sunamoto
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Patent number: 7387760Abstract: An apparatus for making an inflation film formed by extruding a raw resin in a molten state through a circular die to form a tubular film, and expanding the tubular film by the pressure of a gaseous medium introduced into an inner space thereof, while the tubular film is being cooled. The apparatus includes a cooling ring, at least one air ring coaxial with the circular die, and an adjusting device for adjusting the temperature of a gaseous medium, blown from the air ring, to a range effective to retain the tubular film, then still in a molten phase, in a condition in which the tubular film is inflated. A method for making an inflation film is also disclosed.Type: GrantFiled: August 29, 2003Date of Patent: June 17, 2008Assignee: Kuraray Co., Ltd.Inventors: Takahiro Miyata, Katsunori Hatashi, Tatsuya Sunamoto, Tadao Yoshikawa
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Publication number: 20080107833Abstract: A metal-clad laminate excellent in isotropy, appearance, bondability between a TLC polymer film and a metallic sheet, and dimensional stability is provided less costly with a first step of thermally compressing the film with the metallic sheet by passing them through a nipping region between heating rolls, and a second step of heat-treating the resultant metal-clad laminate at a temperature not higher than the melting point of the film, wherein the film has thermal expansion coefficient ?L satisfying ?L=?T+? with thickness T, thickness coefficient ? and anisotropy coefficient ? of the film; wherein the coefficient ? is within the range of ?0.08 to ?0.01; the coefficient ? is within the range of ?M+6????M+10 with thermal expansion coefficient ?M of the metallic sheet; and thermal expansion coefficient ?T of the film is within ?M?2??T??M+3 with the coefficient ?M.Type: ApplicationFiled: October 27, 2005Publication date: May 8, 2008Applicant: KURARAY CO. LTD.Inventors: Minoru Onodera, Tadao Yoshikawa
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Patent number: 7160499Abstract: An inflation film is formed by extruding a raw resin in a molten state through a circular die to form a tubular film, expanding the tubular film by the pressure of a gaseous medium introduced into an inner space of the tubular film, while the tubular film is being cooled to be solidified by blowing a cooling gas to the outer surface of the tubular film, and drawing the film while being progressively flattened by guide members. During the manufacture, the temperature Tf (° C.) of the solidified tubular film at the time it contacts the guide member for the first time is so adjusted as not to be higher than Tr (5) [° C.]; wherein Tr (5) represents the temperature at which the thermal deformation ratio of the solidified tubular film becomes 5% when it is measured, being loaded with a stress of a value equal to the frictional force received from the guide members under the conditions of manufacture of the film.Type: GrantFiled: August 29, 2003Date of Patent: January 9, 2007Assignee: Kuraray Co., Ltd.Inventors: Takahiro Miyata, Katsunori Hatashi, Tatsuya Sunamoto, Tadao Yoshikawa
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Patent number: 7052574Abstract: To continuously produce a metal laminate having excellent dimensional stability and flatness, there is provided with a method of producing a metal laminate in which a thermoplastic liquid crystal polymer film (5?) capable of forming an optically anisotropic melt phase is heat-treated on a heat treatment roll having unevenness (91) on its surface and subsequently a metal sheet (3) is bonded to at least one side of the film (5?).Type: GrantFiled: March 6, 2002Date of Patent: May 30, 2006Assignee: Kuraray Co., Ltd.Inventors: Minoru Onodera, Tatyuya Sunamoto, Tadao Yoshikawa
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Publication number: 20040232603Abstract: The method of manufacturing a film of thermotropic liquid crystal polymer includes extruding a thermotropic liquid crystal polymer of a kind in which any one of activation energies Ea1 and Ea2 of a melt viscosity is within the range of 30 to 90 kcal/mol, with the ratio (Ea1/Ea2) of the activation energy Ea1 relative to the activation energy Ea2 being within the range of 1 to 1.7. The activation energies Ea1 and Ea2 are measured by means of a capillary rheometer, including a nozzle of 1 mm in inner diameter and 10 mm in length disposed at an angle of introduction of 90° and a barrel of 9.55 mm in inner diameter, at respective shear rates of 243 seconds−1 and 2432 seconds−1 under a temperature ranging from the temperature [(Tm−10)° C.], which is lower by 10° C. than the melting point [(Tm)° C.] of the thermotropic liquid crystal polymer, to the temperature [(Tm+20)° C.], which is higher by 20° C.Type: ApplicationFiled: May 12, 2004Publication date: November 25, 2004Applicant: Kuraray Co., Ltd.Inventors: Tadao Yoshikawa, Tatsuya Sunamoto
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Publication number: 20040113331Abstract: An apparatus for making an inflation film formed by extruding a raw resin in a molten state through a circular die to form a tubular film, and expanding the tubular film by the pressure of a gaseous medium introduced into an inner space thereof, while the tubular film is being cooled. The apparatus includes a cooling ring, at least one air ring coaxial with the circular die, and an adjusting device for adjusting the temperature of a gaseous medium, blown from the air ring, to a range effective to retain the tubular film, then still in a molten phase, in a condition in which the tubular film is inflated. A method for making an inflation film is also disclosed.Type: ApplicationFiled: August 29, 2003Publication date: June 17, 2004Applicant: KURARAY CO. LTD.Inventors: Takahiro Miyata, Katsunori Hatashi, Tatsuya Sunamoto, Tadao Yoshikawa
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Publication number: 20040094877Abstract: An inflation film is formed by extruding a raw resin in a molten state through a circular die to form a tubular film, expanding the tubular film by the pressure of a gaseous medium introduced into an inner space of the tubular film, while the tubular film is being cooled to be solidified by blowing a cooling gas to the outer surface of the tubular film, and drawing the film while being progressively flattened by guide members. During the manufacture, the temperature Tf (° C.) of the solidified tubular film at the time it contacts the guide member for the first time is so adjusted as not to be higher than Tr (5) [° C.]; wherein Tr (5) represents the temperature at which the thermal deformation ratio of the solidified tubular film becomes 5% when it is measured, being loaded with a stress of a value equal to the frictional force received from the guide members under the conditions of manufacture of the film.Type: ApplicationFiled: August 29, 2003Publication date: May 20, 2004Applicant: Kuraray Co., Ltd.Inventors: Takahiro Miyata, Katsunori Hatashi, Tatsuya Sunamoto, Tadao Yoshikawa
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Publication number: 20040040651Abstract: To provide a simplified method of making a multi-layer circuit board capable of observing a high density surface mounting of electronic parts, a method is provided for making a multi-layer circuit board including a first film (A) and at least two more films, second and third films (B and C), each being made of thermoplastic polymer capable of forming an optically anisotropic melt phase. The first film (A) has a low melting point (Tm1), and the second and third films (B and C) have respective melting points (Tm2B and Tm2C) higher than the melting point (Tm1) of the first film (A). And at least one of the second and the third films have a circuit pattern thereon. The first to third films (A to C) are thermo compressed together with the first film (A) interposed between the second and third films (B and C).Type: ApplicationFiled: August 13, 2003Publication date: March 4, 2004Applicant: Kuraray Co., Ltd.Inventors: Toshinori Tsugaru, Tatsuya Sunamoto, Tadao Yoshikawa
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Patent number: 6651805Abstract: A screw conveyor apparatus including a ribbon screw (4) provided in a cylindrical casing (1). The ribbon screw (4) has rotation rings (12) attached to an intermediate portion thereof. Outer peripheral supporting sections (11) are provided for rotatably supporting the corresponding rotation rings (12) on the casing (1). This configuration prevents the ribbon screw (4) from being bent or expanded under a load of conveyed materials, thereby enabling the materials to be conveyed along a steep slope up to a high portion.Type: GrantFiled: February 8, 2002Date of Patent: November 25, 2003Assignee: Hitachi Zosen CorporationInventor: Tadao Yoshikawa
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Patent number: 6616796Abstract: A method of producing a metal laminate for a circuit board includes a first step of press-bonding a thermotropic liquid crystal polymer film 1 having a segment orientation ratio SOR within a range not smaller than 0.90 and smaller than 1.15 along the longitudinal direction of the film, to a metal sheet 3 between hot rolls while the thermotropic liquid crystal polymer film 1 is in a tense or non-tense state; and a second step of heating the laminate obtained in the first step to a temperature not lower than the melting point of the thermotropic liquid crystal polymer film.Type: GrantFiled: March 27, 2000Date of Patent: September 9, 2003Assignee: Kuraray Co., Ltd.Inventors: Minoru Onodera, Tadao Yoshikawa, Takeichi Tsudaka, Toshiaki Sato
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Publication number: 20020170939Abstract: To continuously produce a metal laminate having excellent dimensional stability and flatness, there is provided with a method of producing a metal laminate in which a thermoplastic liquid crystal polymer film (5′) capable of forming an optically anisotropic melt phase is heat-treated on a heat treatment roll having unevenness (91) on its surface and subsequently a metal sheet (3) is bonded to at least one side of the film (5′).Type: ApplicationFiled: March 6, 2002Publication date: November 21, 2002Applicant: KURARAY CO., LTD.Inventors: Minoru Onodera, Tatyuya Sunamoto, Tadao Yoshikawa
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Publication number: 20020104739Abstract: A screw conveyor apparatus including a ribbon screw (4) provided in a cylindrical casing (1). The ribbon screw (4) has rotation rings (12) attached to an intermediate portion thereof. Outer peripheral supporting sections (11) are provided for rotatably supporting the corresponding rotation rings (12) on the casing (1). This configuration prevents the ribbon screw (4) from being bent or expanded under a load of conveyed materials, thereby enabling the materials to be conveyed along a steep slope up to a high portion.Type: ApplicationFiled: February 8, 2002Publication date: August 8, 2002Inventor: Tadao Yoshikawa