| abstract |
Vinyl aromatics containing 20 to 60% by weight of uncrosslinked polyolefins such as polyethylene and polypropylene and 40 to 80% by weight (based on the weight of the particles) of vinyl aromatic monomers such as styrene and polymerized by polymerization in a suspension process Copolymer resin particles, which form interpenetrating networks of polyolefins with monomer particles, wherein the gel content is in the range of 0 to 1.5% by weight, based on the weight of the particles, for improved processability and improved ESCR properties in the field of end use. . These copolymer resin particles have a VICAT softening temperature in the range of about 90 to about 115 ° C. and a melt index of 0.2 to 35.0 g / 10 min (condition G). The particles can be mixed with a blowing agent to form an extruded foamed article, such as a foam board, and used in extrusion, injection molding, rotomolding and thermoforming processes to form layers, such as sheets, films, and as binding layers in multilayer structures. Adjacent layers of incompatible polymers, ie polystyrene and polyethylene, can be combined to improve the rigidity of the multilayer structure. |