Colored thermoplastic resin compositions for laser welding, specific neutral anthraquinone dyes as colorants therefor, and molded product therefrom
AssigneeE.I. du Pont de Nemours and Company
InventorsReiko Koshida, Yoshiteru Hatase, Ryuichi Hayashi, Hiroyuki Sumi
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Abstract
Thermoplastic resin compositions suitable for laser welding are disclosed, which include a mixture of neutral anthraquinone blue dye with other red dye to absorb visible light with wavelength less than 700 nm and transmit a laser beam with wavelength at 800 nm to 1200 nm and to enhance weldability.
Claims1
A black colorant suitable for being mixed with a thermoplastic resin and for laser welding, comprising a mixture of neutral anthraquinone dye of formula [I] which imparts color of blue, absorbs visible light with wavelength less than 700 nm and transmit a laser beam with wavelength at 800 nm to 1200 nm in infra-red region with at least one other red dye which transmits the laser beam with wavelength at 800 nm to 1200 nm in infra-red region, absorbing visible light with wavelength less than 700 nm, formula [I] is;
- wherein R55 and R58, which may be the same or different, are independently selected from alkyl groups having 1 to 18 carbon atoms;
- and R58 and R59, which may be the same or different, are independently selected from the group consisting of alkyl, aryl, alkenyl, alkoxy, amino, N-alkylamide, N-arylamide, acyl, acylamide. alkoxycarbonyl, hydroxy, carboxy groups and halogen atom;
- and R57 and R60, which may be the same or different, are independently selected from the group consisting of H, alkyl, aryl, alkenyl, alkoxy, amino, N-alkylamide, N-arylamide, acyl, acylamide, carboxy, alkoxycarbonyl, hydroxy groups and halogen atom.
Dependencies are inferred from the claim text.