Method of producing integral non-foamed skin layer shaped articl

Details Method of producing integral non-foamed skin layer shaped articl Method of producing integral non-foamed skin layer shaped articl

1975-01-10

1977-07-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

20415915, 20415918, 20415920, 260 25N, 264 453, 264 455, 264 53, 264 54, 264331, 264DIG5, 264DIG14, 264DIG17, 428315, 428320, 428322, B29D 2704

Patent

active

040383504

ABSTRACT:
Shaped articles comprising a polymeric frame of uniform density having one or more substantially non-foamed skin layers over all, or only a part of, its surface are produced according to the disclosed method which includes forming a foamable mixture of a photopolymerizable ethylenically unsaturated material, such as vinyl acetate, acrylonitrile, unsaturated polyester resins or the like, and a foaming agent therefor in a mould, subjecting part or all of the surface of the mixture retained in the mould to radiation of a wavelength such that photopolymerization of the material occurs forming a non-foamed or non-foamable skin layer or layers. The thus treated foamable mixture is then foamed and the ethylenically unsaturated material in the foam is polymerized. Shaped articles so produced having an open shell structure are also disclosed.

REFERENCES:
patent: 3562367 (1971-02-01), Shinohara et al.
patent: 3600336 (1971-08-01), Okada et al.
patent: 3655542 (1972-04-01), Tamai et al.
patent: 3681103 (1972-08-01), Brown
patent: 3721723 (1973-03-01), Heidel
patent: 3802949 (1974-04-01), Brown et al.
patent: 3876446 (1975-04-01), Bleckmann et al.
patent: 3926755 (1975-12-01), Marans et al.
patent: 3954924 (1976-05-01), Castro et al.

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