Foamed styrene resin material and heat insulating material using

Details Foamed styrene resin material and heat insulating material using Foamed styrene resin material and heat insulating material using

1999-05-27

2000-03-07

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, C08J 9228, C08J 924

Patent

active

060341432

ABSTRACT:
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.

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patent: 3657162 (1972-04-01), Finestone
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patent: 4173688 (1979-11-01), Saito et al.
patent: 4174425 (1979-11-01), Saito et al.
ShuichiKanyo Gijutsu-shu 57(1982)--133[3347].

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