MY119390A - Acrylic copolymer, process for producing same and vinyl chloride resin composition containing same - Google Patents

Abstract

AN ACRYLIC COPOLYMER SUITABLE AS A PROCESSABI1ITY-MODIFIER FOR VINYL CHLORIDE RESIN IS OBTAINED BY POLYMERIZING 10 -30 WT. PARTS OF A SECOND MONOMER MIXTURE COMPRISING 20 -70 WT. % OF METHYL METHACRYLATE, 0 -60 WT. % OF AN ALKYL METHACRYLATE HAVING AN ALKYL GROUP OF 2 - 8 CARBON ATOMS, 0 -70 WT. % OF AN ALKYL ACRYLATE HAVING AN ALKYL GROUP OF 1 - 8 CARBON ATOMS AND 0 -10 WT. % OF ANOTHER COPOLYMERIZAB1E VINYL MONOMER IN THE PRESENCE OF 70 - 90 WT. PARTS OF A COPOLYMER OBTAINED BY POLYMERIZING A FIRST MONOMER MIXTURE COMPRISING 60 -95 WT. % OF METHYL ETHACRYLATE, 5 - 40 WT. % OF AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF ALKYL METHACRY1ATES HAVING AN ALKYL GROUP OF 2 -8 CARBON ATOMS AND ALKYL ACRY1ATES HAVING AN ALKYL GROUP OF 1 - 8 CARBON ATOMS, AND 0 -10 WT. % OF ANOTHER COPOLYMERIZABLE VINYL MONOMER. THE SECOND MONOMER MIXTURE, WHEN POLYMERIZED ALONE, PROVIDES A GLASS TRANSITION TEMPERATURE OF AT MOST 50 °C. THROUGH MODERATE COAGULATION, THE ACRYLIC COPOLYMER IS RECOVERED AS A POWDERY PRODUCT CONTAINING LITTLE FINE POWDER, SHOWING GOOD F1OWABILITY AND PROVIDING A VINYL CHLORIDE RESIN COMPOSITION HAVING IMPROVED GELATION CHARACTERISTIC AND PROCESSABI1ITY WHEN BLENDED WITH VINYL CHLORIDE RESIN.