Polymer composition having heat-absorbing properties and improved colour properties

Abstract

An embodiment of the present invention relates to a composition comprising a) at least one transparent thermoplastic material; b) at least one inorganic IR absorber comprising at least one boride compound present in an amount of from 0.0015 wt. % to 0.015 wt. %, calculated as solids content of boride in the total polymer composition; and c) at least one inorganic, nano-scale pigment present in an amount of from 0.0008 wt. % to 0.0035 wt. %, based on the total composition; and d) optionally further additives.

1 . A composition comprising
 a. at least one transparent thermoplastic material;   b. at least one inorganic IR absorber comprising at least one boride compound present in an amount of from 0.0015 wt. % to 0.015 wt. %, calculated as solids content of boride in the total polymer composition; and   c. at least one inorganic, nano-scale pigment present in an amount of from 0.0008 wt. % to 0.0035 wt. %, based on the total composition; and   d. optionally further additives.   
     
     
         2 . The composition according to  claim 1 , wherein the ratio of b) to c) is from 20:1 to 0.4:1. 
     
     
         3 . The composition according to  claim 1 , wherein the ratio of b) to c) is from 5:1 to 1.5:1, 
     
     
         4 . The composition according to  claim 1 , wherein the at least one boride compound is selected from the group consisting of type MxBy wherein M represents La, Ce, Pr, Nd, Tb, Dy, Ho, Y, Sm, Eu, ER, Tm, Yb, Lu, Sr, Ti, Zr, Hf, V, Ta, Cr, Mo, W and Ca. 
     
     
         5 . The composition according to  claim 1 , wherein the at least one boride compound comprises LaB 6 . 
     
     
         6 . The composition according to  claim 1 , wherein the at least one inorganic, nano-scale pigment comprises carbon black. 
     
     
         7 . The composition according to  claim 1 , wherein the at least one inorganic, nano-scale pigment comprises a carbon black having a mean particle size of less than 100 nm. 
     
     
         8 . The composition according to  claim 1 , wherein the transparent thermoplastic material comprises a compound selected from the group consisting of polymethyl methacrylates, polycarbonates, copolycarbonates, polyesters, and mixtures thereof. 
     
     
         9 . The composition according to  claim 1 , wherein the composition further comprises triphenylphosphine. 
     
     
         10 . The composition according to  claim 1 , wherein the composition further comprises at least one additive selected from the group consisting of ultraviolet absorbers, colouring agents, demoulding agents, flameproofing agents and heat stabilizers. 
     
     
         11 . The composition according to  claim 1 , wherein the composition has a b*(60°) value of from −2.5 to 0. 
     
     
         12 . A masterbatch comprising
 a. from 85 wt. % to 98.9 wt. % of a transparent thermoplastic material;   b. from 0.1 wt. % to 2 wt. % of a boride as inorganic IR absorber; and   c. from 1 wt. % to 4.8 wt. % of a dispersing agent;   d. optionally from 0 wt. % to 0.2 wt. % of at least one stabilizer selected from the group consisting essentially of phosphines, phosphites and phenolic antioxidants and mixtures thereof;   e. optionally from 0.001 wt. % to 0.2 wt. % of an inorganic nano-scale pigment;   f. optionally from 0 wt. % to 8 wt. % of at least one further auxiliary substance and/or at least one additive,   
       wherein the sum of components a to f is 100 wt. %. 
     
     
         13 . The masterbatch according to  claim 12 , wherein the transparent thermoplastic material is present in an amount of from 93 wt. % to 98.9 wt. %. 
     
     
         14 . The masterbatch according to  claim 12 , wherein the boride as inorganic IR absorber comprises LaB 6 . 
     
     
         15 . The masterbatch according to  claim 12 , wherein the inorganic nano-scale pigment comprises carbon black. 
     
     
         16 . A method which comprises adding carbon black to a polymer composition which comprises nano-scale particles wherein the scattering caused by the nano-scale particles is reduced. 
     
     
         17 . An automobile, railway vehicle, aircraft or architectural glazing comprising the composition according to  claim 1 . 
     
     
         18 . A multilayer product comprising
 at least one layer produced from the composition according to  claim 1 ,   at least one anti-UV layer, and   optionally a scratch-resistant coating.