摘要:
A polymetaphenylene isophthalamide-based polymer porous film having a satisfactory porous structure that exhibits excellent gas permeability and heat resistance. It is produced by a process which comprises casting a dope of the polymetaphenylene isophthalamide-based polymer and coagulating it in a coagulating bath. The porous film may also contain inorganic whiskers, and a composite porous film may be formed in combination with a separate thermoplastic polymer film.
摘要:
An apparatus and a process for producing a laminate for electronic parts such as ceramic capacitors. After a predetermined pattern for forming an internal conductive layer is formed on a self-supporting green sheet which contains inorganic powder and an organic binder, the self-supporting green sheet is taken up by a columnar roll and laminated. At this point, the position of the same pattern on the green sheet G2 of the next cycle to be laminated adjacently onto the green sheet G1 of the previous cycle as the above pattern with respect to the predetermined pattern on the green sheet G1 taken up by the columnar roll is determined.
摘要:
An oriented polyimide film of high strength and a production process therefor. The process basically comprises stretching a gelled film and then imidating the film. The gelled film is formed by introducing a polyamic acid solution into a condensation agent solution. The gelled film is swollen with a solvent at the time of stretching.
摘要:
A resin composition containing a mixture produced by blending a crystalline polyamide expressed e.g. by formula (1) (in the formula, R1 is a bivalent organic aromatic group or aliphatic group having a carbon number of 2 to 30, optionally having substituent and optionally containing non-reactive groups such as ether group and aromatic group in the main chain, and Ar1 is an aromatic residue having a carbon number of 6 to 45 and optionally having substituent) with a thermoplastic polyester. The resin composition has excellent mechanical characteristics such as high elastic modulus, flow properties and heat-resistance and is suitable as a material for an electronic part for surface mounting.
摘要:
The present invention relates to an elastic fiber of polyester elastomer mainly comprising the polyester elastomer further comprising aromatic polyester component as a hard segment and poly(alkyleneoxide)glycol having a number-average molecular weight of 500 to 5000 as a soft segment, wherein a residual elongation after 400 percent stretching does not exceed 100 percent. Made of the polyester elastomer comprising 1,2-bis�4-(2-hydroxyethyl)phenoxy!ethane as the diol component constituting said aromatic polyester component, or 1,4-benzenediethanol and ethyleneglycol as the diol component constituting said aromatic polyester component, the elastic fiber features excellent elastic properties in the event of great deformation and provides suitable material for clothing.
摘要:
A process for the preparation of high-performance grade carbon fibers, which comprises attaching a fine powder of at least one member selected from oxides and carbides of silicon, aluminum, titanium, and boron to a precursor fiber bundle of as spun pitch fibers, subjecting the fiber bundle to an infusibilization treatment, and subjecting the fiber bundle to a carbonization treatment.
摘要:
A meta-type wholly aromatic polyamide containing, as principal repeating units, meta-phenylenediamineisophthalamide units is dissolved in an amide compound solvent; the resultant polymer solution is subjected to a wet-spinning procedure wherein the polymer solution is extruded in the form of filamentary streams into a coagulation bath containing an amide compound-containing solvent and water but substantially not containing salts, through spinning orifices of a spinneret, to coagulate the extruded filamentary polymer solution streams in the coagulation bath; the coagulated porous undrawn filaments are subjected to a drawing procedure wherein the porous undrawn filaments are drawn in a plasticizing drawing bath containing an aqueous solution of an amide compound solvent; the resultant drawn filaments are washed with water, and then heat-treated (for example, further drawn at a draw ratio of 0.7 to 4.0 while being heated at a temperature of 250 to 400° C.), to provide uniform and dense meta-type wholly aromatic polyamide fibers.
摘要:
A pitch-based carbon fiber having a microstructure consisting of strip-like structural units extended in the longitudinal direction of the fiber, wherein the fractal dimension D of the arrangement of the strip-like structural units in the cross-section of the fiber has a fractal structure satisfying the requirement of the following formula (2) relatively to the observation scale r satisfying the requirement of the following formula (1) with respect to the cross-section of the fiber:E/2.5>r>E/25 (1)2.0>D>1.05 (2)wherein E in the formula (1) stands for a smallest principal radius of gyration of cross-sectional area of the cross-section of the fiber.
摘要:
A process is provided for the preparation of a pitch-based carbon fiber having a microstructure consisting of strip-like structural units extended in the longitudinal direction of the fiber, wherein the fractal dimension D of the arrangement of the strip-like structural units in the cross-section of the fiber has a fractal structure satisfying the requirement of the following formula (2) relatively to the observation scale r satisfying the requirement of the following formula (1) with respect to the cross-section of the fiber:E/2.5>r>E/25 (1)2.0>D>1.05 (2)wherein E in the formula (1) stands for a smallest principal radius of gyration of cross-sectional area of the cross-section of the fiber.
摘要:
A process for producing an aromatic polyamide film, which comprises drawing an undrawn aromatic polyamide film biaxially at a draw ratio of at least 1.5 in a solvent mixture consisting of (a) 5% to 75% by weight of a good solvent of the aromatic polyamide and (b) 25% to 95% by weight of a non-solvent of the aromatic polyamide, and heat treating the drawn film, which contains at least 1% by weight, based on the weight of the film, of a good solvent of said aromatic polyamide, at a temperature of not lower than 150.degree. C.An m-phenyleneisophthalamide polymer film having extremely excellent dimensional stability under moist conditions, which film has a density d of from 1.35 to 1.41 g/cm.sup.3 and principal refractive indices n.sub..alpha., n.sub..beta. and n.sub..gamma. (n.sub..alpha. >n.sub..beta. >n.sub..gamma.) for D-line of a wavelength of 589 nm satisfying the following formula: ##EQU1##
摘要翻译:一种芳族聚酰胺薄膜的制造方法,其特征在于,在由(a)5重量%〜75重量%的芳香族聚酰胺的良溶剂组成的溶剂混合物中,以拉伸比为1.5以下的双轴拉伸未拉伸芳香族聚酰胺薄膜 和(b)25重量%至95重量%的芳族聚酰胺的非溶剂,并且对所述拉伸膜进行热处理,所述拉伸膜基于所述膜的重量,含有至少1重量%的良好溶剂 所述芳族聚酰胺在不低于150℃的温度下进行。在湿润条件下具有非常优异的尺寸稳定性的间苯二甲酰间苯二胺聚合物膜,该密度d为1.35至1.41g / cm 3,主折射率为nα ,对于波长为589nm的D线的nβ和nγ(nα> nβ> n伽马)满足以下公式: