摘要:
The invention relates to a process for rendering flame-resistant the thermoplastic aromatic polycarbonates prepared by a solution process, characterized by dispersing an aqueous solution of salt-like flameproofing agent in a washed and neutral polycarbonate/organic solvent system.
摘要:
The heat distortion resistance and the molecular weight of polypropylene terephthalate and polybentylene terephthalate can be increased by cocondensing up to 10 mol-% of aliphatic diols containing 5 to 10 carbon atoms or of cycloaliphatic diols containing 8 to 12 carbon atoms.
摘要:
Thermoplastic compositions of1. 30 to 70 parts by weight of a thermoplastic aromatic polycarbonate urethane obtained by reacting a low molecular weight aromatic polycarbonate having terminal chloroformic acid ester groups and a degree of polymerization P.sub.n of 1 to 20, preferably 1 to 10, with 1 to 15 mol %, based on the quantity of dihydroxy compound co-condensed in the polycarbonate, of disecondary aliphatic, cycloaliphatic or aromatic diamines, and2. 70 to 30 parts by weight of a mixture of2.1. 0 to 100 % by weight of a copolymer of monomers from the groups2.1.1. styrene, .alpha.-methyl styrene and/or2.1.2. acrylonitrile, methacrylonitrile, acrylic acid esters, methacrylic acid esters,2.2. 100 to 0 % by weight of a graft polymer of a monomer mixture of2.2.1. 95 to 50 % by weight of styrene, .alpha.-methyl styrene, methyl methacrylate or mixtures thereof,2.2.2. 5 to 50 % by weight of acrylonitrile, methacrylonitrile or mixtures thereofOn a rubber.
摘要:
Non-porous, thin, polycarbonate films and a process for their production. Solutions of polycarbonates in concentrations of less than 5 parts solids per 100 parts solvent are applied to the surface of liquids immiscible, or sparingly miscible with, the solvent for the polycarbonate. The solvent is then evaporated, and the resultant film removed. The films are useful for the separation of gas and liquid mixtures and for electrical insulating purposes.
摘要:
A branched, high molecular-weight polyaryl-ether sulphone which is the reaction product of approximately equimolar amounts of an aromatic dialkali metal bishydroxylate and a bis-(halogen-aryl) compound, whose aryl nuclei are linked by sulphonyl groups, and about 0.01 to about 2 mol %, based on the bishydroxylate or bis-(4-halogenaryl) compound, of an aromatic compound having at least three aromatically linked alkali metal hydroxylate substitutents and/or of a halogenaryl compound having at least three aryl-linked halogen substituents and which is capable of substitution under the reaction conditions of polyaryl-ether sulphone manufacture.