Sekisui Plastics Co., Ltd.

Hideyasu Matsumura

Yasutaka Tsutsui

Ikuo Morioka

Tatsuya Matsugashita

Shinji Ishida

Takaaki Hirai

Hiroyuki Yamagata

Hiroyuki Ueno

Yukio Aramomi

Yuichi Gondo

Naokuni Inada

Minoru Fujishima

A process for producing pre-expanded particles, comprising the steps of:

Pre-expanded particles, process for producing the same, and expanded molded article

A method for producing styrene-modified linear low-density polyethylene-based resin particles, which includes the steps of: dispersing 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin particles 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 particles 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)&#xb0; C. where T&#xb0; C. is a crystallization peak temperature of the polyethylene-based resin particles.

Styrene-modified linear low-density polyethylene-based resin beads, styrene-modified linear low-density polyethylene-based expandable resin beads, production method therefor, pre-expanded beads and expanded molded article

A method of reducing an odor of composite resin particles comprising the step of:

Method of reducing odor of composite resin particles, and composite resin particles

A method of reducing a volatile organic compound of composite resin particles comprising the step of:

Method for reducing volatile organic compounds in composite resin particles, and composite resin particles

A method for producing styrene-modified polyethylene-based resin beads, including the steps of: dispersing 100 parts by weight of polyethylene-based resin beads which contain an inorganic nucleating agent and have a melting point of 95&#xb0; C. to 115&#xb0; C., 20 parts by weight or more and less than 300 parts by weight of a styrene-based monomer and a polymerization initiator 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)&#xb0; C. to (T+25)&#xb0; C. (where T&#xb0; C. is a melting point of the polyethylene-based resin beads.)

Styrene-modified polyethylene-based resin beads, styrene-modified polyethylene-based expandable resin beads, production method therefor, pre-expanded beads and expanded molded article

Expandable polystyrenic resin particles having superior resistance to cracking of a molded foam product, having superior retention of blowing agent and maintaining expandability over a long period of time, a production process thereof, and a molded foam product are provided. These expandable polystyrenic resin particles contain a volatile blowing agent in polystyrenic resin particles obtained by impregnating and polymerizing a styrenic monomer in polyolefin resin particles to form a polystyrenic resin, wherein together with the styrenic monomer being used at 140 to 600 parts by weight to 100 parts by weight of the polyolefin resin particles, the average thickness of the surface layer observed in scanning electron micrographs obtained by immersing sections cut into halves through the center from the surface of the resin particles in tetrahydrofuran followed by extracting the polystyrenic resin component and capturing cross-sections of said sections is 15 to 150 &#x3bc;m, and the volatile blowing agent is contained at 5.5 to 13.0% by weight.

Expandable polystyrenic resin particles and production process thereof, pre-expanded particles and molded foam product

According to the present invention, there is provided expandable beads of a styrene-modified linear low-density polyethylene-based resin comprising a volatile blowing agent and a base resin, the base resin containing more than 300 parts by weight and less than 1000 parts by weight of a polystyrene-based resin component relative to 100 parts by weight of a non-crosslinked linear low-density polyethylene-based resin component, wherein the base resin contains 2 to 40 wt % of a gel component comprising a graft copolymer of the polystyrene-based resin component and the low-density polyethylene-based resin component.

Expandable resin beads of styrene-modified straight-chain and low-density polyethylene, process for production thereof, pre-expand beads, and foams

According to the present invention, there is provided expandable beads of a styrene-modified linear low-density polyethylene-based resin comprising a volatile blowing agent and a base resin, the base resin containing more than 50 to 1000 parts by weight of a polystyrene-based resin component relative to 100 parts by weight of a non-crosslinked linear low-density polyethylene-based resin component, wherein the base resin contains less than 2 wt % of a gel component comprising a graft polymer of the polystyrene-based resin component and the low-density polyethylene-based resin component.

Expandable resin particles of styrene-modified straight-chain and low-density polyethylenne, process the production thereof, pre-expanded particles, and foams

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/cm, and an absorbance ratio at 698 cmand 2850 cm(D/D) 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.

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

An expanded molded article having a void percentage of 5 to 50%, the molded article comprising 50 to 800 parts by weight of styrene-based resin relative to 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin which can be obtained by using a metallocene catalyst, wherein the molded article is obtained by impregnating styrene-modified linear low-density polyethylene-based resin beads with a volatile blowing agent to provide expandable beads, pre-expanding the expandable beads and then subjecting the obtained pre-expanded beads to expansion molding, the styrene-modified linear low-density polyethylene-based resin beads each have the styrene-based resin dispersed in the form of particles, and a diameter of particle is 0.8 &#x3bc;m or smaller in a surface region within at least 5 &#x3bc;m from the bead surface and in a center region within a 5 &#x3bc;m radius from the bead center.

Expanded molded article having voids

The present invention provides a process for producing a molded foam article of a crystalline aromatic polyester resin. The process is characterized by heating the surface temperature of a mold for cavity-molding to the temperature within a range of from (td&plus;35) to (Tg&plus;57)&deg;C. (Tg is a glass transition temperature of the crystalline aromatic polyester resin prepuffs), thereby to mold prepuffs, and cooling the surface of the mold to a temperature not lowered than Tg for at least 20 seconds.

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Shiga, Japan

Hideyasu Matsumura