POLYBLENDS DES ABS-TYPS MIT AGGLOMERISIERTEM KAUTSCHUKSUBSTRAT VON RELATIV MONODISPERSER PARTIKELGROESSE UND VERFAHREN ZU IHRER HERSTELLUNG

• Main Authors: DALTON, WILLIAM OWEN, HAMPDEN, TREMENTOZZI, QUIRINO ALBERT, SPRINGFIELD
• Format: Patent
• Language: German
• Published: 10.05.1973
• Edition: 1
• 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

1354079 Polyblends MONSANTO CO 21 April 1972 18563/72 Heading C3G A polyblend comprises (a) a matrix of an interpolymer consisting to the extent of at least 50% by weight of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile; and (b) a graft polymer having a rubber substrate and a superstrate of an interpolymer consisting to the extent of at least 50% by weight of a monovinylidene aromatic monomer and an ethylenically unsaturated nitrile, in which (i) the rubber substrate has a weight average particle size of from 0À35 to 0À70 micron, the particles being substantially monodisperse in size with at least 70% by weight of the particles being within 0À05 micron of the weight average particle size; and (ii) the graft copolymer having 15 to 45 x 10-7 gram of superstrate per square centimetre of substrate when the substrate has a particle size of from 0À35 to 0À50 micron and 40 to 70 x 10-7 gram of superstrate per square centimetre of substate surface when the substrate has a particle size of from 0À50 to 0À70 micron, the molecular weight of the superstrate corresponding to an intrinsic viscosity of from 0À35 to 0À60 in dimethyl formamide at 25‹ C. The polyblend may be produced by grafting the superstrate monomers on to a rubber latex produced by treating a latex of rubber particles of weight average particle size of less than 0À15 micron to agglomerate the particles to the required size and optionally blending the resulting graft polymer with a polymer of composition similar to that of the superstrate interpolymer. Examples are given in which butadiene-acrylonitrile rubber is grafted with styrene and acrylonitrile and styrene-acrylonitrile interpolymer is added to the graft polymer.