摘要:
Virtually uncrosslinked polyacetylenes in film form are prepared by polymerization of acetylene using a liquid catalyst system consisting of an organicaluminum compound and a titanate in the form of a solution in a viscous inert liquid on a substrate to which the catalyst solution is applied, by a process in which, after the polymerization, the polymer is treated with a strong reducing agent which is inert to the organoaluminum catalyst component, the polymer is, if desired, oriented and is freed from residual catalyst and reducing agent by washing with a liquid, doped with a strong electron acceptor or electron donor in a conventional manner to increase the conductivity and dried, and the materials thus obtained are, if desired, covered with a layer or sheath of nonconductive material.
摘要:
Finely divided electrically conductive pyrrole polymers are prepared by a process in which a finely divided pyrrole polymer, obtained by polymerization of pyrroles in solution with an oxygen-containing oxidizing agent, is electrochemically charged in the presence of a conductive salt. The finely divided electrically conductive pyrrole polymers can be used for the production of moldings.
摘要:
Self-extinguishing molding materials, comprising (A) a polymer of a vinyl-aromatic compound, especially a styrene polymer, which has been made impact-resistant (B) a polyphenylene ether and (C) a flameproofing additive, with or without (D) conventional additives, wherein one part of the soft component of the impact-resistant polymer of the vinyl-aromatic compound has a mean particle size of .ltoreq.1.5 .mu.m and the other part has a mean particle size of .ltoreq.3 .mu.m. Such molding materials not only have good self-extinguishing properties but also give moldings having a particularly uniform matt surface.
摘要:
Thermoplastic molding materials based on styrene polymers which have been made impact-resistant and on polyphenylene ethers, wherein the particles of the soft component of the styrene polymer which has been made impact-resistant have a mean diameter of more than 1 micron, and wherein the proportion of particles which have a diameter of less than 0.6 micron is not less than 40% by weight and the proportion of particles which have a diameter of from 0.6 to 3 microns is less than 3% by weight.
摘要:
A process for the preparation of high molecular weight polyphenylene ethers from monohydric phenols which have alkyl substituents in both ortho-positions and may additionally have an alkyl substituent in one meta-position but not in the para-position, by an oxidative coupling reaction, employing oxygen, at from 10.degree. to 25.degree. C., in the presence of a catalyst complex comprising a copper salt and an N-substituted imidazole, in the presence of an aromatic C.sub.8 -C.sub.10 -hydrocarbon solvent.N-Methylimidazole, N-ethylimidazole, N-isopropylimidazole, N-n-butylimidazole, N-cyclohexylimidazole, N-octylimidazole and N-phenylimidazole are preferably used as the imidazole, advantageously in amounts of from 0.5 to 5 percent by weight.
摘要:
Thermosplastic molding materials which contain styrene polymers and polyphenylene ethers whose phenolic hydroxyl groups have been reacted with reactive copolymers.
摘要:
A process for the preparation of acetylene copolymers by catalytic polymerization of a mixture of acetylene and dialkynes or polyalkynes, using Ziegler catalysts. The novel polymers may be used as colored pigments, as colored coatings for metal, glass or plastics, and for the production of electrical or magnetic components.
摘要:
Thermoplastic molding compositions based on rubber-modified styrene-acrylonitrile copolymers containing a halogenated styrene oligomer as the effective flame-proofing agent which is sufficiently heat-stable, does not interfere with processing on conventional machinery, does not corrode or cause coatings on such machinery, and has virtually no adverse effect on the impact strength of the polymers. The flameproofing agent as a rule has a degree of polymerization of from 3 to 200 and can be incorporated into the polymer by conventional methods; the polymer may or may not contain additional synergistic agents and processing auxiliaries, which are incorporated in the conventional manner and in the conventional amounts.
摘要:
New compounds containing tribromomethyl groups, of the general formula ##STR1## WHEREIN X is chlorine or bromine, R is hydrogen or methyl and R.sup.1 is hydrogen or a group of the formula --COO--CHX--CBr.sub.3 and a process for their preparation. The compounds may be used for the manufacture of homopolymers or copolymers which find diverse uses, eg. for the manufacture of moldings, coatings or adhesives. The compounds are manufactured by reacting the corresponding acid chlorides or acid bromides with equivalent amounts of tribromoacetaldehyde. The acid chlorides and bromides have the formula ##STR2## wherein X is chlorine or bromine, R is hydrogen or methyl and R.sup.2 is hydrogen or --COX. The reaction is carried out in the presence of from 0.1 to 10 per cent by weight of a Lewis acid, preferably AlBr.sub.3 or FeBr.sub.3, at from 0 to 80.degree. C., generally with reaction times of from 1 to 10 hours, preferably from 2 to 3 hours. The reaction is carried out without solvents or, with particular advantage, in a solution, of about 50 per cent strength, in an inert aliphatic, cycloaliphatic or aromatic solvent, eg. hexane mixtures, octane mixtures, cyclohexane or toluene. From 0.1 to 10 per cent by weight of magnesium oxide is added to the reaction mixture, prior to the distillation to achieve good yields and compound purity.
摘要:
Polymers of which the side chains contain urethane groups and which have the reactivity of a urethane but can, in addition, contain other reactive groups. The new polymers may be used to produce moldings, coatings or adhesives.