Process for producing expandable thermoplastic resin beads using polypropylene as nucleus
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United States of America Patent
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-
Dec 1, 1981
Issued Date -
N/A
app pub date -
Nov 17, 1980
filing date -
Oct 15, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for producing expandable thermoplastic resin beads which comprises suspending in an aqueous medium 20 to 70% by weight of polypropylene resin particles 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 polypropylene 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.
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