Prime Polymer Co., Ltd.

Yasuhiko Otsuki

Ryoichi Tsunori

Minoru Sugawara

Masayuki Shinohara

Tsutomu Onodera

Shohei Ikeda

Motoki Yamada

The extruded propylene-based resin composite foam () according to the present invention is provided by extrusion-foaming a molding material containing a propylene-based resin. The propylene-based resin forming the extruded foam has an olefin-based polymer whose loss tangent (tan &#x3b4;) is 0.04 to 100 at a temperature of 298 K and a frequency of 10 Hz. The molding material includes a fibrous filler in an amount of more than 0 mass % and 60 mass % or less of the entirety of the molding material. The extruded composite foam () includes: first extruded foam () whose closed cell content is 40 percent or more and whose expansion ratio is 10 or more; and second extruded foam () whose closed cell content is less than 40 percent and whose expansion ratio is 10 or more.

Extruded propylene-resin composite foam

An object of the present invention is to provide an extruded propylene-based resin foam in which a average diameter of cells therein can be reduced while a high expansion ratio remains high, thereby providing an excellent insulation efficiency. The extruded propylene-based resin foam according to the present invention is extruded propylene-based resin foam that is formed by extrusion-foaming a propylene-based resin, and the extruded propylene-based resin foam has the expansion ratio of 10 or more and the average cell diameter of less than 400 &#x3bc;m. With this configuration, the extruded foam can have a plurality of air bubble walls therein. Thus, the extruded propylene-based resin foam can efficiently block external radiant heat, thereby realizing excellent insulation efficiency.

Extruded propylene resin foam

A multistage propylene-based polymer including the following components (A) and (B): (A) 5 to 20 wt % of a propylene homopolymer component or a copolymer component of propylene and an &#x3b1;-olefin with 2 to 8 carbon atoms having an intrinsic viscosity [&#x3b7;] of more than 10 dL/g in tetralin at 135&#xb0; C.; and (B) 80 to 95 wt % of a propylene homopolymer component or a copolymer component of propylene and an &#x3b1;-olefin with 2 to 8 carbon atoms having an intrinsic viscosity [&#x3b7;] of 0.5 to 3.0 dL/g in tetralin at 135&#xb0; C.

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Ichihara, Japan

Yasuhiko Otsuki