摘要:
A thermoplastic molding composition containing 1 to 99 parts by weight of aromatic polycarbonate or polyester carbonate and 1 to 99 parts by weight of at least one graft polymer prepared by solution polymerization is disclosed. The graft polymer is characterized in having rubber content of 20 to 50 wt. % and in that the average particle size of its rubber phase is 80 to 600 nm. The composition, which optionally contains additives, flameproofing agents and reinforcing agents, is characterized by its improved mechanical properties.
摘要:
A continuous process for the manufacture of impact resistant polymers is disclosed. The process comprise polymerization of a reaction mixture containing vinylaromatic monomers in the presence of soluble rubber and entails shearing at least some of said mixture at a rate of more than 30000 1/s using a device having no rotating parts. The resulting product is characterized in its low gloss and improved impact properties.
摘要:
A process for producing impact-resistant moulding compositions, which is characterised in that a monomer mixture comprising 90 to 20 parts by weight of an aromatic monoalkenyl compound, 10 to 50 parts by weight of an ethylenically unsaturated nitrile, 0 to 30 parts by weight of other copolymerisable compounds is polymerised by a radical mechanism in the presence of 15 to 50 parts by weight, per 100 parts by weight of monomers, of a soluble, gel-free butadiene polymer, and in the presence of 50 to 200 parts by weight, per 100 parts by weight of monomers, of a solvent, wherein the solvent is selected from the group comprising an aliphatic (C1-C8) or cycloaliphatic alcohol, ketone, ether, ester, nitrile (A) or mixtures thereof or a mixture of (A) with an aliphatic (C4-C10), cycloaliphatic or aromatic hydrocarbon (B) in an A:B weight ratio of 100:0 to 30:70, and the polymerisation is conducted as far as a polymer content of the total mixture of 30 to 70% by weight, with thorough mixing and optionally with the subsequent addition of a regulator and initiator, so that the isolated thermoplastic moulding composition contains 20 to 40% by weight of butadiene polymer.
摘要:
The invention relates to flameproofed polycarbonate/ABS blends which are resistant to stress cracking, wherein the polycarbonates are wholly or partly modified by halobutyl rubber blocks.
摘要:
This invention relates to substance mixtures for thermoplastic molding compositions, comprising A) polyamide and/or copolyamide, B) copolymers of at least one olefin and of at least one acrylate of an aliphatic alcohol, C) additives with chain-extending effect and D) impact modifiers and optionally also E) other additives and/or F) fillers and reinforcing materials. The invention further relates to processes for producing molding compositions of the invention and molded products or semifinished products which are produced from the substance mixtures of the invention, preferably by means of extrusion or blow molding of the molding compositions to be produced from the substance mixtures.
摘要:
Saturated, liquid, low molecular weight and low-viscosity isobutylene polymers terminally functionalized by special groups, which correspond to the following formula ##STR1## are produced by solution ozonolysis of high molecular weight isobutylene/diene copolymers containing diene monomers, stabilization of the products obtained after the ozone treatment by addition of peroxide decomposers and subsequent reduction with hydrogen in the presence of hydrogenation catalysts under pressures of 10 to 300 bar and at temperatures of 20.degree. to 300.degree. C., optionally in the presence of sulfur or amines or ammonia.
摘要:
Aromatic dicarboxylic acids of the formula ##STR1## in which R.sup.1, R.sup.2, m, n, and X have the meaning mentioned in the description,can be prepared from the bisphenols, on which they are based, of the formula ##STR2## if the bisphenols are first reacted to give the bissulphonates, the sulphonate groups are removed catalytically with H.sub.2 and the hydrocarbons obtained in this way are doubly acylated in a known manner and the acyl groups are oxidized to the carboxyl groups.Many of the aromatic dicarboxylic acids which can be prepared in this way are new.
摘要:
A process for producing a graft copolymer is disclosed. The graft copolymer, based on a rubber which contains phenolic OH groups and grafted with polycarbonate chains is produced under the conditions of the two-phase interfacial polycondensation. Also disclosed are gasoline resistant thermoplastic polycarbonate compositions containing the graft.
摘要:
The present invention provides flame-resistant polycarbonate moulding compositions with a concentration of alkali metal or alkaline earth metal salts and of silicon compounds and their preparation.
摘要:
Polyester and polyester carbonates corresponding to the following formula ##STR1## in which R.sup.1 to R.sup.4, o to r, n, a and b and also X.sup.1 and Y.sup.1 are as defined in the specification,may be obtained by interfacial condensation from bisphenols corresponding to the following formula. ##STR2## aromatic dicarboxylic acid chlorides corresponding to the following formula ##STR3## and phosgene. The new polyesters and polyester carbonates combine outstanding heat resistance and light stability. They may be used both as thermoplastic materials as such or as constituents of polymer blends or even as UV (light) stabilizers or as UV (light)-stabilizing coatings. Accordingly, they have degrees of polycondensation n in the range from 2 to 100.