Sekisui Plastics Co., Ltd.

Yukio Aramomi

Ikuo Morioka

Takaaki Hirai

Hideyasu Matsumura

Mutsuhiko Shimada

Hiroyuki Yamagata

Hiroyuki Ueno

Minoru Fujishima

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.

Method for producing foamed-in-mold product of aromatic polyester based resin

A foamed styrene resin material has a density .rho. of 0.02 to 0.008 and a melt tension of the styrene resin of 5 to 40 gf. The relation between an average cell diameter d (.mu.m) and the density .rho. is given by the expression: ##EQU1## and a relation between a thermal conductivity .lambda. (kcal/m.multidot.h.multidot..degree. C.) and the density .rho. given by the expression: ##EQU2## Accordingly, the foamed styrene resin material has a low thermal conductivity and excellent insulating property in spite of a low density (high expansion ratio foam) thereof.

Foamed styrene resin material and heat insulating material using the

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Shiga, Japan

Yukio Aramomi