Polyisocyanate foam having isotropic cells and method and appara

Details Polyisocyanate foam having isotropic cells and method and appara Polyisocyanate foam having isotropic cells and method and appara

1978-01-26

1979-07-03

Marquis, Melvyn I.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 404, 264 54, 264DIG84, 521 50, C08J 900

Patent

active

041600746

ABSTRACT:
A polyisocyanate foam having isotropic cells is manufactured by a foaming operation in an apparatus comprising a mold composed of side walls capable of extending and returning, or folding and unfolding, in directions perpendicular to the free rising direction. Mold extending means are provided to spread out the side walls of the mold perpendicular to the free rising direction. While the foamable composition is in a creamy state, it is allowed to rise freely in one direction (the free rising direction), while the side walls of the mold are in their folded condition, until a height detecting means is actuated. Then the side walls of the mold are unfolded to enlarge the cross-sectional area of the mold so that the foamable composition is then permitted further to expand freely in directions perpendicular to the initial free rising direction, until the foamable composition is transformed from the creamy state to the tack-free state, whereby a polyisocyanate foam product having essentially spherical isotropic cells is obtained.

REFERENCES:
patent: 3249486 (1966-05-01), Voisinet et al.
patent: 3916023 (1975-10-01), Porter et al.

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