초록 ▼

In the art of pigmenting high molecular weight organic materials there is a long-felt need for high-hiding organic red pigments, in particular yellowish red pigments, which are increasingly used to replace the ecologically unsafe inorganic red pigments. However, this gap in the market cannot be sati

In the art of pigmenting high molecular weight organic materials there is a long-felt need for high-hiding organic red pigments, in particular yellowish red pigments, which are increasingly used to replace the ecologically unsafe inorganic red pigments. However, this gap in the market cannot be satisfactorily filled by using the tetrachloroperylenetetracarboximide pigments known for the aforementioned purpose. According to the invention, it has now been found that a chlorine content of ≤25% in such chlorinated perylimides confers remarkable coloristic properties on the pigments thus produced, so that these pigments are superior in hiding powder and masstone to the tetrachloroperylimide compounds described. Accordingly, the invention is directed to high-hiding red pigments of the type of the halogenated perylenetetracarboximides containing up to 4 chlorine atoms, whose chlorine content is 15-25% and which are present as mixed crystal pigments in the bma

대표청구항 ▼

A brilliant, high-hiding, non-transparent mixed crystal pigment based on halogenated perylene-3,4,9,10-tetracarboximides (perylimides), wherein said mixed crystal is formed from two or more individual components of different structures but both corresponding to general formula I [Figure] where X is

A brilliant, high-hiding, non-transparent mixed crystal pigment based on halogenated perylene-3,4,9,10-tetracarboximides (perylimides), wherein said mixed crystal is formed from two or more individual components of different structures but both corresponding to general formula I [Figure] where X is chlorine, Y is bromine and m and n are each integers from 0 to 4, but cannot both be zero, wherein the total chlorine content of the mixed crystal is ≤25.2% by weight and the mixed crystal is predominantly or wholly present in the b0.15 m