VERFAHREN ZUR HERSTELLUNG EINER THERMOPLASTISCHEN FORMMASSE

• Main Authors: SCHWABEN,HANS-DIETER,DR, KLAERNER,PETER,DR, ECHTE,ADOLF,DR
• Format: Patent
• Language: German
• Published: 10.12.1987
• Edition: 4
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A process for the preparation of an impact-resistant thermoplastic moulding composition containing A from 60 to 95% by weight of a hard matrix which contains a1) from 50 to 99.8% by weight of a vinyl aromatic monomer having 8 to 12 carbon atoms and a2) from 0.2 to 10% by weight of a polar, monoethylenically unsaturated monomer, B from 3 to 40% by weight of a soft phase, prepared by free-radical polymerisation of the monomers a1) and a2) which build up the hard matrix, in the presence of an elastomeric graft base based on homopolybutadiene or two-block copolymers of butadiene containing from 40 to 90% by weight of styrene, C from 0.1 to 5% by weight of a further component, by conventional polymerisation and subsequent work-up and isolation of the target product, which comprises carrying out the polymerisation of the monomers a1) and a2) which build up the hard matrix in the presence of both the elastomeric graft base and of component C, and using acrylic acid as the monomer a2) and, as component C, an ionic crosslinking agent selected from the group comprising alkali metal salts, alkaline earth metal salts and zinc salts of straight-chain fatty acids having 16 to 22 carbon atoms.