Controlled color laser marking of plastics

Details Controlled color laser marking of plastics Controlled color laser marking of plastics

1997-06-13

1999-11-02

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

21912185, 264409, B23K 2600

Patent

active

059775149

ABSTRACT:
A method for obtaining both light and dark laser marks on a colored plastic article by using a composition with (i) a thermoplastic resin that foams when heated, (ii) about 0.4% to 0.7% by weight of a mica based laser energy absorbing additive and (iii) a coloring agent with one or more colorants selected from the group of pigments, dyes, and mixtures of pigments and dyes. Using a laser at certain settings results in charring of the resin to produce dark laser marks. At other selected laser settings, the resin foams to produce a light mark on a colored background. By varying the laser energy settings, various degrees of both foaming and charring can be achieved on a single plastic article, having a single resin composition, resulting in a multicolored laser image produced by various shades of light and/or dark marks against the background color.

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