Patent ID: 7513947
Filing Date: 2009-04-07
Classification: B29C,B29K,C08K

Abstract:
1. 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 R 55 and R 58 , which may be the same or different, are independently selected from alkyl groups having 1 to 18 carbon atoms; and R 58 and R 59 , 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 R 57 and R 60 , 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.