US 2006/0217452 A1 · Pre-expanded particle of olefin-modified polystyrene resin, process for producing the same, and molded foam

Abstract

A pre-expanded beads of olefin-modified polystyrene-based resin comprising a pie-expanded beads of a polystyrene-based resin modified with a polyolefin-based resin, wherein a styrene-based monomer forming a polystyrene-based resin in the beads is used in the range of 100 to 1,000 parts by weight relative to 100 parts by weight of a polyolefin-based resin, a bulk density of each bead is 0.012 to 0.20 g/cm3, and an absorbance ratio at 698 cm−1 and 2850 cm−1 (D698/D2850) obtained from an infrared absorption spectrum of each bead surface measured by ATR method infrared spectroscopy is in the range of 0.1 to 2.5.

Claims19

Dependent claims

A pre-expanded beads of olefin-modified polystyrene-based resin comprising a pre-expanded beads of a polystyrene-based resin modified with a polyolefin-based resin, wherein a styrene-based monomer forming a polystyrene-based resin in the beads is used in the range of 100 to 1,000 parts by weight relative to 100 parts by weight of a polyolefin-based resin, a bulk density of each bead is 0.012 to 0.20 g/cm3, and an absorbance ratio at 698 cm−1 and 2850 cm−1 (D698/D2850) obtained from an infrared absorption spectrum of each bead surface measured by ATR method infrared spectroscopy is in the range of 0.1 to 2.5.

A method for producing pre-expanded beads of olefin-modified polystyrene-based resin comprising the steps of:

(a) polymerizing a styrene-based monomer (100 to 1,000 parts by weight relative to 100 parts by weight of polyolefin-based resin beads to be used) while impregnating polyolefin-based resin beads with the styrene-based monomer, in the presence of a polymerization initiator in an aqueous medium in which the polyolefin-based resin beads are dispersed, to obtain the olefin-modified polystyrene-based resin beads,
(b) impregnating the resin beads with a blowing agent, and
(c) pre-expanding the resin beads impregnated the blowing agent to obtain the pre-expanded beads of olefin-modified polystyrene-based resin,
wherein in the step (a), the aqueous medium is stirred at a power required for stirring of 0.06 to 0.8 kw/m3, and impregnation and polymerization of the styrene-based monomer are performed under a condition where a styrene-based monomer content in the polyolefin-based resin beads is 35% by weight or less.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/567,084Filed 23 Jul 2004

Priority

JP 2003-30787029 Aug 2003

Published

28 Sep 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08J 9/18
Making expandable particles: by impregnating polymer particles with the blowing agent
C08J 2203/12
Foams characterized by the expanding agent: organic compounds only containing carbon, hydrogen and oxygen atoms, e.g. ketone or alcohol
C08J 2203/14
Foams characterized by the expanding agent: saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
C08J 2351/06
Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated…:…

Pre-expanded particle of olefin-modified polystyrene resin, process for producing the same, and molded foam

Life of this patent

Pre-expanded particle of olefin-modified polystyrene resin, process for producing the same, and molded foam

Life of this patent

Abstract

Claims19