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公开(公告)号：JPH01282335A
公开(公告)日：1989-11-14
申请号：JP11402688
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , KOMATSU SHIGENORI
IPC: D06M11/00 , D01F9/14 , D01F9/15 , D06M11/81 , D06M101/00 , D06M101/40
Abstract: PURPOSE:To obtain the subject fiber, having a high elastic modulus and excellent in compression characteristics at a low cost by applying a boron compound to a pitch yarn prepared by melt spinning mesophase pitch and calcining the resultant fiber at a high temperature. CONSTITUTION:Mesophase pitch obtained by extracting heavy oil with a solvent or hydrogenating the heavy oil and distilling the hydrogenated oil is melt spun and a boron compound (preferably with 0.2-1.0wt.% boron content) is applied to the resultant pitch yarn. The pitch yarn is then infusibilized and calcined at >=2500 deg.C temperature to afford the aimed fiber. Furthermore, the boron compound is most preferably used together with an aqueous emulsion of a polysiloxane compound.
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公开(公告)号：JPH01282330A
公开(公告)日：1989-11-14
申请号：JP11402088
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , AKIMOTO TATSUO , OGASAWARA MASASHI
Abstract: PURPOSE:To increase a ratio of infusibilization and obtain a carbon fiber with a ready handling at a low cost by spinning a pitch so as to have a finess lower than a specified value, accommodating the resultant staples in a vessel, infusibilize the staples and then calcining the staples in an inert atmosphere. CONSTITUTION:A pitch is initially spun preferably using the flash spinning, etc., so as to have a finess lower than 0.33 denier and formed into staples. The resultant staples are then accommodated in a vessel and infusibilized or infusibilized in an oxidative atmosphere in a fluidized state. The infusibilized fiber is subsequently calcined in an inert atmosphere to provide the objective fiber. In case of infusibilization of the staples in a vessel, a vessel made of stainless is preferably used as the vessel and the vessel accommodating the pitch is preferably subjected to oxidation treatment in an oxidative liquid followed by treatment thereof in an oxidative gas. As the method for infusibilizing the pitch fiber in a fluidized state, an oxidative gas is preferably blown in the fluidizing zone equipped under a spinning machine while allowing the pitch fiber to fall to the zone.
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公开(公告)号：JPH01282329A
公开(公告)日：1989-11-14
申请号：JP11401988
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , IWAMI TOMONORI
Abstract: PURPOSE:To obtain the subject infusibilized fiber capable of providing a carbon fiber with high strength and elongation and excellent in handling properties at a low cost by carbonization by oxidizing a pitch fiber with a specified diameter in a nitric acid solution in a range satisfying a specified relation about the reaction period, the reaction temperature and the concentration of nitric acid. CONSTITUTION:A mesophase pitch is melted and degassed at 320 deg.C under 60mm Hg using a bented extruder, etc., subsequently discharged through a spinning nozzle and drawn to prepare a pitch yarn with
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公开(公告)号：JPH01282324A
公开(公告)日：1989-11-14
申请号：JP11401488
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , KOMATSU SHIGENORI , SHIOKAWA MICHIHIRO
Abstract: PURPOSE:To obtain a carbon fiber with high physical properties without deteriorating strength thereof by calcining an infusibilized pitch-based yarn with a low degree of fusion. CONSTITUTION:An infusibilized pitch yarn with
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公开(公告)号：JPH01282320A
公开(公告)日：1989-11-14
申请号：JP11401088
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI
Abstract: PURPOSE:To prevent a pitch yarn from being damaged by winding a pitch without applying excessive load to the weak pitch yarn using a special traverse guide after melt spinning. CONSTITUTION:A pitch yarn is wound using a traverse guide having the surface coated with a film of a liquid after melt spinning of the pitch. In addition, ceramics with the surface subjected to smooth treatment is preferable as the traverse guide.
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Patent Agency Ranking
公开(公告)号：JPH01282319A
公开(公告)日：1989-11-14
申请号：JP11400988
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , FUKUHARA MOTOTADA
Abstract: PURPOSE:To stably obtain a highly uniform pitch yarn by controlling a distance between a nozzle and the cooling liquid surface under a specified value in case of melt spinning of a pitch and uniformly cooling a spun pitch. CONSTITUTION:A distance between a nozzle and the cooling surface is controlled under 4.5mm, preferably within 1-4mm in case of melt spinning of a pitch such as a coal-based, a petroleum-based or synthesized pitch to provide the objective pitch yarn. In addition, imparting convergence and handling properties to the yarn by using a surfactant or an oil medicine as the cooling liquid, washing tar, dust, etc., on the pitch yarn surface with an organic solvent such as alcohol or hexane, infusibilizing the yarn using an oxidative liquid such as nitric acid, are also preferable.
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公开(公告)号：JPH01282317A
公开(公告)日：1989-11-14
申请号：JP11400688
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , KOMATSU SHIGENORI
Abstract: PURPOSE:To prevent occurrence of crack and simultaneously obtain a carbon fiber without reducing the elastic modulus by melt spinning a mesophase pitch while controlling the apparent viscosity and the draft thereof within a specified range. CONSTITUTION:A mesophase pitch consisting of a coal-based, petroleum-based pitch, etc., is melt spun while controlling the apparent viscosity eta and the draft d within a range of 50
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公开(公告)号：JPH01282316A
公开(公告)日：1989-11-14
申请号：JP11400488
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , KOMATSU SHIGENORI , OGASAWARA MASASHI
Abstract: PURPOSE:To obtain the subject high-tenacity and high elastic modulus carbon fiber having no crack by discharging a pitch with optical anisotropy through slit-shaped nozzle holes, subsequently through other nozzle holes with a circular cross section and then carrying out infusibilizing and graphitization treatment. CONSTITUTION:A pitch with optical anisotropy is initially discharged through nozzle holes 9 with a slit-shaped cross section and then through other nozzle holes 10 with a substantially circular cross section of a sectional area eta that of the above mentioned slit-shaped nozzle holes equipped in succession from the above mentioned slit-shaped nozzle holes after reducing the flow of the pitch. The resultant pitch yarn is subsequently subjected to infusibilization treatment and calcined, thus obtaining the objective carbon fiber with a circular cross section and composed of a fine structure where lamellas spread to the outside through an adjacent boundary reaching the fiber surface.
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公开(公告)号：JPH01282314A
公开(公告)日：1989-11-14
申请号：JP11400288
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MIZUKI TATSURO , MATSUMOTO TADAYUKI
Abstract: PURPOSE:To obtain the subject high elongation fiber useful as a heat insulator and having such a handling property that a stable carbonization process thereof may be carried out in a continuous system, in case of precarbonization treatment of an infusibilized fiber by cooling the fiber at a specified rate or more as soon as the fiber reaches the maximum treatment temperature of the precarbonization. CONSTITUTION:In case of precarbonization treatment of an infusibilized fiber obtained by spinning a pitch as the raw material and then infusibilizing the resultant fiber, as soon as the fiber reaches the maximum treatment temperature of the precarbonization, the fiber is cooled at a rate of 8 deg.C/min or more to provide the objective fiber. In addition, the precarbonization is preferably carried out under an inert atmosphere, e.g., at 400-800 deg.C.
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公开(公告)号：JPH01282310A
公开(公告)日：1989-11-14
申请号：JP11403888
申请日：1988-05-10
Applicant: TORAY INDUSTRIES
Inventor： MATSUMOTO TADAYUKI , MIZUKI TATSURO
Abstract: PURPOSE:To obtain a pitch yarn, consisting of a high polymer capable of forming liquid crystals oriented in the fiber axis direction and pitch component and capable of improving poor yarn-making properties, handleability and melt sticking in infusibilization. CONSTITUTION:A pitch yarn, obtained by blend or conjugate spinning of (A) a high polymer, such as wholly aromatic polyesters or polyester amides, capable of forming liquid crystals oriented in the fiber axis direction and (B) a pitch component, such as optically anisotropic pitch, and suitable as flame-resistant fibers, carbon fibers, etc.
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