摘要:
A resin composition comprising 100 parts by weight of a thermoplastic resin, 1 to 150 parts by weight of a carbon- precursor organic compound (A), and 0.001 to 40 parts by weight of a copolymer constituted of polymeric segments (e1) and (e2) which have surface tensions against the thermoplastic resin and the organic compound (A) within specific ranges: and a process for the production of carbon fiber, characterized by producing a molding of a precursor fiber (B) from the composition, stabilizing the carbon-precursor organic compound (A) contained in the precursor fiber (B) to form a stabilized precursor fiber (C), removing the thermoplastic resin contained in the stabilized precursor fiber (C) to form a fibrous carbon precursor (D) free from the thermoplastic resin, and then subjecting the fibrous carbon precursor (D) to carbonization or graphitization.
摘要:
The present invention relates to a wholly aromatic polyester carbonate and a process for its production. An aromatic dicarboxylic acid, an aromatic diol, and a diaryl carbonate are used as starting materials in specific molar ratios, a prepolymerization step, a crystallization step, and a solid-phase polymerization step are essential steps, and a compression molding step is an optional step. This makes it possible to produce with good productivity a wholly aromatic polyester carbonate that has low coloration and a high degree of polymerization.
摘要:
Disclosed is a fibrous activated carbon wherein fine pores in the surface of the activated carbon have diameters of 0.1-200 nm and the activated carbon is in the form of fiber having a fiber diameter of not more than 1000 nm.
摘要:
A molding formed from a melt of both a wholly aromatic polyester carbonate or wholly aromatic polyester and an aromatic polycarbonate which each is unsusceptible to discoloration even upon melting at a high temperature. This product is used for producing various automotive parts or electrical/electronic parts.
摘要:
A process for producing a wholly aromatic polyester which is excellent in heat resistance, mechanical properties and yet color and has a high degree of polymerization by melt polymerizing a dicarboxylic acid and a diol directly on an industrial scale at a low cost in a short period of time without esterifying the dicarboxylic acid or diol in advance. To produce the wholly aromatic polyester by reacting and molding an aromatic dicarboxylic acid such as terephthalic acid, an aromatic diol such as 2,2-bis(4-hydroxyphenyl)propane and a diaryl carbonate by heating, a combination of a specific pyridine compound and an alkali metal (bi)carbonate, a combination of a specific pyridine compound and an organic tin compound or a specific titanium compound is existent as a catalyst. Thereby, the wholly aromatic polyester having the above properties is obtained.
摘要:
A carbon fiber which contains metal elements such as Li, Na, Ti, Mn, Fe, Ni and Co in a total content of 50 ppm or less, has a fiber diameter in the range of 0.001 to 2 μm, and has no branch; and an aggregate comprising a plurality of the above carbon fibers.
摘要:
A wholly aromatic polyester carbonate having a satisfactory color tone and excellent thermal stability. This polymer has an alkali metal content as low as 10 ppm or below. The polymer is advantageously produced by reacting an aromatic dicarboxylic acid, an aromatic diol, and a diaryl carbonate in a specific molar proportion using a pyridine compound as a catalyst.
摘要:
The present invention relates to a carbon fiber bundle excellent in terms of adhesion to matrix resins and process handleability and less apt to suffer the shedding of the sizing agent in processing steps. The carbon fiber bundle of the invention is a carbon fiber bundle having a sizing agent adherent to the surface thereof, characterized in that the carbon fiber bundle includes a plurality of carbon fibers and the sizing agent includes a copolyamide resin, the copolyamide resin having both a specific polyamide component and nylon-6 and/or nylon-66 as repeating units and having a melting point of 180°C or lower. The melting point of the copolymer resin is preferably 60 to 160°C, and the glass transition temperature thereof is preferably in the range of -20 to 50°C.