MASTER BATCH FOR EXTRUSION FOAMING AND ITS PRODUCTION AND PRODUCTION OF HEAT-RESISTANT STYRENE-BASED RESIN FOAM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a master hatch capable of producing a foam sheet composed of styrene-(meth)acrylic acid-based copolymer or styrene maleic anhydride-based copolymer, excellent in balance of cell diameter and heat-softening elongation, namely excellent in balance of surface appearance having fine texture and deep drawability and improved in brittleness by using master batch. ;SOLUTION: This master batch for producing heat resistant styrene based foam sheet comprises melt-kneading (A) 40.0-90.0 wt.% heat-resistant styrene- based copolymer consisting essentially of a vinylaromatic compound and a vinylic compound having carboxylic acid group and/or carboxylic acid anhydride group copolymerizable with the vinyl aromatic compound with (B) 5.0-45.0 wt.% rubber like polymer and (C) 5.0-15.0 wt.% copolymer of a vinyl-aromatic compound and/or a methacrylic acid ester with an acrylic acid ester and having at least ≥300,000 weight average molecular weight and ≤100°C glass transition point.;COPYRIGHT: (C)1999,JPO