Method of making cellular polymeric shaped articles having relief patterns
AssigneeEiwa Chemical Industrial Co., Ltd.
InventorsShinji Murakami, Kazuo Okuse
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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.
Claims6
A method of making cellular polymeric shaped articles having a relief pattern on their surfaces comprising forming thermoplastic polymer composition containing 0.2 to 20 parts by weight of azodicarbonamide per 100 parts by weight of the polymer into a desired shape, printing a pattern on the surface of the shaped body, irradiating the printed shaped body with light rays of wave lengths 100 to 500 m.mu. for 1 to 60 minutes and heating the irradiated body to effect expansion of the composition in the non-irradiated areas.
Dependencies are inferred from the claim text.