Styrene-Modified Linear Low-Density Polythylene-Based Resin Beads, Styrene-Modified Linear Low-Density Polyethylene-Based Expandable Resin Beads, Production Method Therefor, Pre-Expanded Beads and Expanded Molded Article
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United States of America Patent
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Issued Date -
Oct 18, 2007
app pub date -
Aug 19, 2005
filing date -
Sep 6, 2004
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Abandoned
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Abstract
A method for producing styrene-modified linear low-density polyethylene-based resin beads, which includes the steps of: dispersing 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin beads which are polymerized using a metallocene compound as a catalyst and contain an inorganic nucleating agent, 50 to 800 parts by weight of a styrene-based monomer and 0.1 to 0.9 parts by weight of a polymerization initiator relative to 100 parts by weight of the styrene-based monomer into an aqueous suspension containing a dispersant; impregnating the polyethylene-based resin beads with the styrene-based monomer under heating the resulting dispersion at such a temperature that the styrene-based monomer does not substantially polymerize; and performing polymerization of the styrene-based monomer at a temperature of (T+10) to (T+35).degree. C. where T.degree. C. is a crystallization peak temperature of the polyethylene-based resin beads.
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