Extruded synthetic resin foam and its manufacturing method

Details Extruded synthetic resin foam and its manufacturing method Extruded synthetic resin foam and its manufacturing method

1990-10-31

1991-11-12

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521 88, 521 91, 521 92, 521143, 521148, 521908, C08J 910

Patent

active

050648748

ABSTRACT:
An extruded synthetic resin foam comprises a cell structure of substantially two different cell sizes, the smaller size being not more than about 0.25 mm while the other size is from about 0.4 to about 1 mm. The cells are dispersed in an island in the sea manner. A foam such as a styrenic foam is produced by forming a mixture of synthetic resin, a fine mineral powder having hydroxyl groups, and a cell controlling agent, incorporating a volatile foaming agent and extruding the mixture to form a foam. The powder has a particle size of not more than 1000 nm and may be a silica having silanol groups.

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patent: 4522955 (1985-06-01), Fukushima et al.
patent: 4559367 (1985-12-01), Hurps et al.
patent: 4990542 (1991-02-01), Motani et al.

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