Patent ID: 8119716

Claim:
A method for preparing a plastics premix or a plastic which comprises, based on the total weight of the plastics premix or of the plastic, 0.1% to 70% by weight of primary particles comprising deagglomerated barium sulphate comprising a crystallization inhibitor and having an average primary particle size <500 nm, which comprises dispersing and deagglomerating the barium sulphate in the presence of a dispersant which is different from the crystallization inhibitor, in an organic solvent as continuous organic phase to produce a dispersion, introducing the dispersion into a plastic or a precursor of the plastic, and evaporating off the solvent, wherein the dispersant has at least one anionic group which is able to interact with the surface of the barium sulphate, and at least one polyether or polyester based side chain which prevents reagglomeration sterically and which further comprises at least one group for coupling to or into polymers selected from OH, NH, and NH 2 groups.