Colored thermoplastic resin compositions for laser welding, specific neutral anthraquinone dyes as colorants therefor, and molded product therefrom

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.

1 . A thermoplastic resin composition for laser welding comprising: 
 1) thermoplastic resin; and,    2) a laser beam transmitting black colorant comprising neutral anthraquinone dye of formula [I] or [II]   wherein 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 56  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, and 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, and hydroxy groups and halogen atom,    and wherein formula [II] is                          wherein R 61 , R 62 , R 63 , and R64, which may be the same or different, are independently selected from the group consisting of H, alkyl, alkenyl, aryl, alkoxy, amino, N-alkylamide, N-arylaminde, acyl, acylamide, carboxy, alkoxycarbonyl, hydroxy group, halogen atom, formula [II-a], and P 1  is NR 66  or CO, wherein R 66  is H, alkyl, or aryl groups.    formula [II-a] is:                          wherein p 2  is NH or NHCO; R 65  is H, alkyl, aryl, alkoxy, amino, hydroxy, or halogen atom.    
     
     
         2 . The composition of  claim 1  wherein the thermoplastic resin is polyamide or polyester.  
     
     
         3 . The composition of  claim 1  further comprising a second dye mixed with said neutral anthraquinone dye to produce said black colorant.  
     
     
         4 . The composition of  claim 3  wherein said second dye is selected from the group consisting of perinone dyes, monoazo complex dyes, and anthraquinone dyes.  
     
     
         5 . The composition of  claim 1  further comprising reinforcing agent.  
     
     
         6 . A transparent article formed from the composition of  claim 1 .  
     
     
         7 . An article formed by laser welding opaque articles with the transparent article of  claim 5 .  
     
     
         8 . 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] or [II] which imparts color of blue, absorbs visible light with wavelength less than 700 mn 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.  
       
         
           
           
               
               
           
         
       
       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 56  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, and 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, and hydroxy groups and halogen atom,  
       and  
       
         
           
           
               
               
           
         
       
       wherein R 61 , R 62 , R 63 , and R 64,  which may be the same or different, are independently selected from the group consisting of H, alkyl, alkenyl, aryl, alkoxy, amino, N-alkylamide, N-arylaminde, acyl, acylamide, carboxy, alkoxycarbonyl, hydroxy group, halogen atom, formula [II-a], and P 1  is NR 66  or CO, wherein R 66  is H, alkyl, or aryl groups.  
       formula [II-a] is:  
       
         
           
           
               
               
           
         
       
       wherein p 2  is NH or NHCO; R 65  is H, alkyl, aryl, alkoxy, amino, hydroxy, or halogen atom.