Method of forming dimensionally stable foamed articles of polyvi

Details Method of forming dimensionally stable foamed articles of polyvi Method of forming dimensionally stable foamed articles of polyvi

1976-04-06

1978-11-14

Anderson, Philip

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

Synthetic resins

Cellular products or processes of preparing a cellular...

33379, 260 4214, 264 453, 264 455, 264DIG14, 264DIG17, 264DIG83, 521 12, 521146, 521 98, B29D 2700

Patent

active

041254902

ABSTRACT:
A rigid, dimentionally stable, distortion-free article of foamed polyvinyl aromatic resin, having a solid outer skin, is formed by incorporating in a foamable polyvinyl aromatic resin a finely, divided inert solid that has been surface treated to render the solid hydrophobic and then molding the foamable composition under foaming conditions. Foamed polyvinyl aromatic resin articles molded in accordance with the present invention have physical dimensions capable of meeting tolerances in the order of .+-. 0.002 inches and are suitable for use in the manufacture of precision measuring devices and, particularly, frames for level instruments.

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