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
Life of this patent
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Abstract
Thermoplastic resin compositions suitable for laser welding are disclosed, which include a mixture of neutral anthraquinone dyes and at least one other red dye to absorb and transmit select regions of visible light and to enhance weldability.
Claims8
A thermoplastic resin composition for laser welding comprising:
- 1) thermoplastic resin;
- and,
- 2) a laser transmitting black colorant comprising a mixture of a) neutral anthraquinone dye which imparts colors of blue, violet or green, absorbs visible light with wavelength less than 700 nm and transmits a laser beam with wavelength at 800 nm to 1200 nm in the infra-red region with b) at least one other red dye which transmits with a wavelength at 800 nm to 1200 nm in infra-red region, selected from the group consisting of perinone dyes monoazo complex dyes and anthraquinone dyes.
A laser-transmitting black colorant suitable for being mixed with a thermoplastic resin applied to a laser welding comprising a mixture of a) neutral anthraquinone dye which imparts colors of blue, violet or green, absorbs visible light with wavelength less than 700 nm and transmits a laser beam with wavelength at 800 nm to 1200 nm in mire-red region with b) at least other red dye which transmits the laser beam with wavelength at 800 nm to 1200 nm in infra-red region, selected from the group consisting of perinone dyes, monoazo complex dyes and anthraquinone dyes.
Dependencies are inferred from the claim text.