Method of making cellular polymeric shaped articles having relie

Details Method of making cellular polymeric shaped articles having relie Method of making cellular polymeric shaped articles having relie

1974-10-23

1976-04-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 52, 264134, 427 12, 428178, B29D 2700

Patent

active

039490289

ABSTRACT:
A method of making cellular or expanded polymeric shaped articles having relief patterns which comprises forming a thermoplastic polymer composition containing azodicarbonamide as a chemical blowing agent into a desired shape, irradiating a surface of the shaped body thus obtained with light of wave lengths of 100 to 500 m.mu. through a printed pattern applied thereto or a screen which locally shades light rays, such as a stencil or a positive or negative transparency, superposed thereon and heating the shaped body to effect foaming or expansion thereof.

REFERENCES:
patent: 3836624 (1964-09-01), Ferris
patent: 3864143 (1975-02-01), Fantazier et al.

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