Powdery pigment preparations for dyeing films

Abstract

The invention relates to a powdery pigment preparation containing a pigment which is dispersed in an acrylate resin and which is characterized in that the acrylate resin has an average molar mass Mw ranging from 40000 to 80000 g/mol and is a copolymer comprised of 50 to 65 mol % ethyl methacrylate, of 30 to 45 mol % butyl methacrylate, and of 0.5 to 5 mol % methacrylic acid. The powdery pigment preparation can be used for dying films, particularly those made of polymethyl methacrylate. The films do not have any specks nor holes.

1 ) A powderous pigment preparation comprising a pigment in dispersion in an acrylate resin, wherein the acrylate resin has an average molar mass Mw of between 40 000 and 80 000 g/mol and is a copolymer of from 50 to 65 mol % ethyl methacrylate, from 30 to 45 mol % butyl methacrylate, and from 0.5 to 5 mol % methacrylic acid.  
     
     
         2 ) A pigment preparation as claimed in  claim 1 , wherein the acrylate resin has an average molar mass Mw between 50 000 and 70 000 g/mol.  
     
     
         3 ) A pigment preparation as claimed in claims  1  or  2 , wherein the acrylate resin is composed of from 55 to 60 mol % ethyl methacrylate, from 35 to 40 mol % butyl methacrylate, and from 1 to 4 mol % methacrylic acid.  
     
     
         4 ) A pigment preparation as claimed in at least one of  claims 1  to  3 , wherein the butyl methacrylate is n-butyl methacrylate.  
     
     
         5 ) A pigment preparation as claimed in at least one of  claims 1  to  4 , wherein the weight ratio between the pigment and the acrylate resin is from 70:30 to 30:70.  
     
     
         6 ) A pigment preparation as claimed in at least one of  claims 1  to  5 , wherein the pigment is a monoazo, disazo, laked azo pigment, azo condensation pigment, benzimidazolone, naphthol, isoindolinone, isoindoline, phthalocyanine, quinacridone, anthanthrone, perylene, perinone, thioindigo, thiazineindigo, quinophthalone, dioxazine or diketopyrrolopyrrole pigment or carbon black.  
     
     
         7 ) A pigment preparation as claimed in at least one of  claims 1  to  5 , wherein the pigment is a nickel titanate, chromium titanate, iron oxide, ultramarine, chromium oxide or titanium dioxide.  
     
     
         8 ) A pigment preparation as claimed in at least one of  claims 1  to  7 , composed of 
 a) from 30 to 70% by weight, preferably from 45 to 55% by weight, of a pigment;  
 b) from 70 to 30% by weight, preferably from 55 to 45% by weight, of the acrylate resin,  
 c) from 0 to 8% by weight, preferably from 2 to 4% by weight, of a lubricant, and  
 d) from 0 to 10% by weight, preferably from 0 to 1% by weight, of further customary additives, the sum of all components being 100% by weight.  
 
     
     
         9 ) A process for producing a pigment preparation as claimed in one or more of  claims 1  to  8 , which comprises dispersing the pigment in the acrylate resin, plastifying the mixture at from 100 to 160° C., and comminuting the plastic mass.  
     
     
         10 ) The use of a pigment preparation as claimed in one or more of  claims 1  to  8  to color plastics, especially polymethyl methacrylate, paints, printing inks, electrophotographic toners, and powder coating materials.  
     
     
         11 ) The use as claimed in  claim 10  to color films, particularly of polymethyl methacrylate.