Process for producing expandable thermoplastic resin beads

Details Process for producing expandable thermoplastic resin beads Process for producing expandable thermoplastic resin beads

1980-11-17

1981-12-01

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 60, 521139, 521140, 525288, 525292, 525302, 525316, 525317, 525322, 525193, C08J 916, C08J 918

Patent

active

043037569

ABSTRACT:
A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium 20 to 70% by weight of a random copolymer of propylene and ethylene containing 1 to 10% by weight of ethylene and 99 to 90% by weight of propylene and 30 to 80% by weight of a vinyl aromatic monomer such as styrene, polymerizing the vinyl aromatic monomer in the presence of a polymerization catalyst to graft the vinyl aromatic monomer onto the backbone of the random copolymer and, optionally, adding a cross-linking agent, to form graft-copolymerized thermoplastic resin beads, and introducing a blowing agent into the thermoplastic resin beads. The resulting resin beads have excellent foamability and molding fusability, and a foamed shaped article having superior thermal stability can be prepared from these beads.

REFERENCES:
patent: 3743611 (1973-07-01), Muroi et al.
patent: 3959189 (1976-05-01), Kitamori
patent: 3972843 (1976-08-01), De Jong

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