Expandable thermoplastic resin beads

Details Expandable thermoplastic resin beads Expandable thermoplastic resin beads

1990-03-30

1990-11-06

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264321, 264544, 264DIG5, 521 56, 521 60, 521 81, 521139, 521180, C08J 922

Patent

active

049684663

ABSTRACT:
A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium interpolymer beads comprising a polyphenylene ether resin and a polymerized vinyl aromatic monomer such as styrene, polymerizing the vinyl aromatic monomer in the presence of a polymerization catalyst to interpolymerize the vinyl aromatic monomer with the polyphenylene ether and, optionally, adding a cross-linking agent, to form interpolymerized thermoplastic resin beads, and introducing a blowing agent under pressure 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: 4782098 (1988-11-01), Allen et al.
patent: 4874796 (1989-10-01), Allen
patent: 4920153 (1990-04-01), Allen et al.

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