摘要:
A polyarylene sulfide resin composition comprising as major components: (A) 100 parts by weight of a polyarylene sulfide resin; (B) 200-30 parts by weight of mica; (C) 150-30 parts by weight of carbon fiber; and (D) 30-0.5 parts by weight of conductive carbon black. Various parts with stable conductivity and high dimensional precision can be produced from this resin composition by one molding operation.
摘要:
A process for preparing a polycyanoaryl ether powder which comprises;reacting at a temperature between 100.degree. and 350.degree. C. a dihalogenobenzonitrile with an alkali metal salt of at least one of hydroquinone and dihydroxydiphenyl in the presence of a solvent (i) selected from the group consisting of dimethyl sulfoxide, diethyl sulfoxide, sulfolane, N-methylpyrrolidone, N-methylacetoamide and N-methylformamide to form a reaction mixture containing a dissolved polycyanoaryl ether; andwhen the concentration of said dissolved polycyanoaryl ether in the reaction mixture is in the range of from 2 to 15% by weight, adding to said reaction mixture, a solvent (ii) which is miscible with said solvent (i) but which is not a solvent for said polycyanoaryl ether, said solvent (ii) being added in an amount of from 30 to 200% by volume based on the volume of said solvent (i) and said solvent (ii) being added at a temperature of from 10.degree. to 100.degree. C., whereby said polycyanoaryl ether precipitates from said reaction mixture to which said solvent (ii) has been added, as an extremely fine powder.
摘要:
Disclosed is a novel polymer of this invention which comprises having a recurring unit represented by the formula: ##STR1## and having a reduced viscosity (.eta.sp/c) of 0.2 dl/g or more at 60.degree. C. in a solution of a concentration of 0.2 g/dl in p-chlorophenol as a solvent, a method for preparing the same which comprises reacting a dihalogenobenzonitrile represented by the formula: ##STR2## wherein X represents a halogen atom, with an alkali metal salt of resorcin represented by the formula: ##STR3## wherein M represents an alkali metal, in the presence of a solvent; and then treating the reaction product obtained by water or alcohol, and molding materials and molded products employing the polycyanoaryl ether.
摘要:
Polycyanoaryl ether stretched films and fibers prepared from polycyanoaryl ethers containing specific repeating units and number-average molecular weights or reduced viscosities by stretching molded films or melt-spinned fibers, said films and fibers having superior heat resistance and mechanical strength.
摘要:
Provided is a polyarylene sulfide resin composition for sealing electronic parts, which comprises (A) from 20 to 35% by weight of a polyarylene sulfide resin, (B) from 60 to 75% by weight of silica, and (C) from 1 to 10% by weight of an elastomer, and contains (D) from 0.05 to 1.2 parts by weight of an epoxysilane and/or (E) from 0.1 to 3 parts by weight of an epoxy resin, both relative to 100 parts by weight of the total amount of the components (A), (B) and (C). The composition has good PCT and TCT acceptable quality and good fluidity, naturally having good properties intrinsic to ordinary PAS resin, and which, when used for sealing electronic parts, causes neither deformation of bonding wires and other elements nor package breakdown, and is therefore favorable to materials for sealing electronic parts.
摘要:
Provided is a filter favorably used in high-temperature long-term exposure conditions, for example, in coal boilers, cupola furnaces for steel and cast iron production, cement kilns, aggregate drying furnaces, furnaces for non-iron metals, etc. For the filter, provided are a filter material comprising a web or a web and its support, which contains a polycyanoaryl ether in an amount of not smaller than 5% by weight relative to the weight of the filter material; and a filter material comprising a substrate of polycyanoaryl ether fibers or of polycyanoaryl ether fibers and other organic fibers, and a web of at least one type of fibers selected from polycyanoaryl ether fibers and other organic fibers, wherein the amount of the polycyanoaryl ether fibers is not smaller than 5% by weight relative to the total weight of the substrate and the web.
摘要:
A polycyano aryl ether which has recurring units each represented by the formula: ##STR1## and a reduced viscosity of which is 0.3 dl/g or more at 60.degree. C. in a solution in which the polycyanoaryl ether is dissolved in p-chlorophenol in a concentration of 0.2 g/dl.A method for preparing the above-mentioned polycyanoaryl ether which comprises reacting a dihalogenobenzonitrile represented by the formula: ##STR2## wherein X is a halogen atom, with an alkali metal salt of dihydroxynaphthalene represented by the formula: ##STR3## wherein M is an alkali metal, in the presence of a solvent.And a method for preparing a polycyanoaryl ether powder without mechanical grinding steps for purification, which comprises adding to the resulting reaction mixture of the above-mentioned polycondensation reaction a solvent which does not dissolve the resulting polymer but has compatibility with the solvent used in polycondensation when the concentration of the resulting polymer dissolved in the resulting rection mixture reaches to the range of from 2 to 20% by weight.The polymer of this invention is excellent in mechanical strength, fire retardance and solvent resistance. Further, the method of this invention can prepare the high molecular weight polycyanoaryl ether with ease and with high productivity when compared with a conventional method. Moreover, if the method for preparing the polycyanoaryl ether powder of this invention is applied, a mechanical process for grinding the resulting polymer will be unnecessary, the powder prepared by this invention is finer than the conventionally pulverized powder and the subsequent purification process is carried out to a sufficient degree.
摘要:
A polyarylene sulfide resin composition comprising (A) a polyarylene sulfide resin, (B) an aliphatic or saturated cyclic polycarbodiimide resin or a precursor thereof, and preferably (C) reactive silicone compound grains, and (D) a polyethylene naphthalate resin or (E) a filler, which improves excellent properties exhibited by polyarylene sulfide resins, and which is also endowed with an excellent adhesion characteristics to adhesives such as epoxy resins. In addition, a molded article obtained by molding a polyarylene sulfide resin composition endowed with such excellent properties is useful as a container for accommodating an electric component material. Such a molded article may also be used as an electronic component having conductive portions which are totally or partially accommodated in the container, wherein the conductive portions are seled by a sealant encapsulated in the container.
摘要:
Disclosed are slide members for parts to be in contact with magnetic tape, which are made of polyarylenesulfide resin compositions comprising from 20 to 40% by weight of a polyarylenesulfide resin optionally combined with an amorphous, thermoplastic resin, and from 60 to 80% by weight of calcium metasilicate whiskers having a mean fiber diameter of not larger than 5 .mu.m and a mean aspect ratio of not smaller than 5, optionally combined with an inorganic filler. While being shaped, the resin compositions have good fluidity. The slide members are used in electric and electronic devices as the parts to be in contact with magnetic tape, for example, as VTR cylinders (drums). The slide members have high mechanical strength and good dimensional stability, and have good slidability with magnetic tape.
摘要:
Disclosed is a novel polymer of this invention which comprises having a recurring unit represented by the formula: ##STR1## and having a reduced viscosity (.eta.sp/c) of 0.2 dl/g or more at 60.degree. C. in a solution of a concentration of 0.2 g/dl in p-chlorophenol as a solvent, a method for preparing the same which comprises reacting a dihalogenobenzonitrile represented by the formula: ##STR2## wherein X represents a halogen atom, with an alkali metal salt of resorcin represented by the formula: ##STR3## wherein M represents an alkali metal, in the presence of a solvent; and then treating the reaction product obtained by water or alcohol, and molding materials and molded products employing the polycyanoaryl ether.