Jsp Corporation

Noritoshi Nishiyama

Naochika Kogure

Masato Naito

Daisuke Imanari

Hiroyuki Gokuraku

Teruyuki Akiyama

Shunsuke Sekiya

Atsushi Taira

The present invention relates to an extruded styrenic resin foam and a method for producing the same, wherein a base resin composing the extruded styrenic resin foam is a styrenic resin mixture of a styrene-(meth)acrylic ester copolymer, or a combination of a styrene-(meth)acrylic ester copolymer and polymethyl methacrylate, and a styrenic resin except the styrene-(meth)acrylic ester copolymer, and the styrenic resin mixture contains a (meth)acrylic ester component at a ratio of 4 to 45% by weight with reference to the styrenic resin mixture. The present invention provides an extruded styrenic resin foam having an apparent density of 20 to 60 kg/m, a thickness of 10 to 150 mm, and a low thermal conductivity, and keeping excellent heat insulation performance over a long period of time and flame retardancy, even when the styrenic resin extruded foam is foamed using a blowing agent having an ozone depleting potential of 0 (zero) and a low global warming potential.

Extruded styrenic resin foam and method for producing the same

A process for an extruded resin foam, comprising extruding a foamable composition comprising a melted polystyrene resin and a physical blowing agent through a die to obtain a polystyrene resin foam having a thickness of at least 10 mm and a transverse cross-sectional area of at least 50 cm, wherein said extrusion is performed so that the ratio Mz/Mn of a Z average molecular weight Mz of the polystyrene resin foam to a number average molecular weight Mn of the polystyrene resin foam, each measured by gel permeation chromatography, is 8.0 or more.

Process for producing polystyrene resin foam by extrusion

Description is made of an open cell polystyrene resin foam having a content of organic volatile matters of less than 100 ppm. The open cell foam is suitable as a core material for a sound insulating material or a vacuum heat insulating material. The open cell foam can be produced by melt-kneading a polystyrene resin having a content of organic volatile matters of 100 ppm or higher together with water in an extruder, sucking out the organic volatile matters as an azeotrope with water through a vent, injecting a blowing agent and kneading the injected mixture, and extruding the mixture into a lower pressure area to cause the resin to foam.

Core material for vacuum heat insulation material, and vacuum heat insulation material

A method for production of an extruded, polystyrene-based foam plate wherein a polystyrene-based resin is heated and kneaded together with a blowing agent, a flame retardant and a nucleating agent in an extruder to obtain a foamable molten composition, and the foamable molten composition is extruded through a die attached to an end of the extruder into a lower pressure zone. The blowing agent comprises not smaller than 25% by weight but not greater than 65% by weight, based on the total weight of the blowing agent, of an isobutane-containing saturated hydrocarbon; not smaller than 5% by weight but not greater than 70% by weight, based on the total weight of the blowing agent, of a dimethyl ether-containing ether; not smaller than 5% by weight but not greater than 55% by weight, based on the total weight of the blowing agent, of carbon dioxide; and 0&#x2013;25% by weight, based on the total weight of the blowing agent, of other blowing agent components.

Growing community of inventors

Utsunomiya, Japan

Noritoshi Nishiyama