Solid silica preparation
The present invention relates to solid silica preparations composed of the components (A) 20% to 80% by weight, based on the total weight of the preparation, of a silica; (B) 20% to 50% by weight, based on the total weight of the preparation, of at least one additive selected from the group consisting of a water-soluble, nonionic, surface-active additive based on polyethers, a water-soluble, surface-active additive containing carboxylate groups, a polyurethane, an anionic, surface-active additive based on acidic phosphoric, phosphonic, sulfuric or sulfonic esters; (C) if appropriate, further components, the further components comprising no pigments, and the sum of all components (A), (B), and (C) making 100% by weight. The invention further relates to methods of producing them and also to methods of coloring high molecular mass organic or inorganic materials, more particularly of coloring plastics.
1. A solid silica preparation in granule form comprising
(A) 30% to 60% by weight, based on the total weight of the preparation, of a silica;
(B) 20% to 50% by weight, based on the total weight of the preparation, of at least one additive selected from the group consisting of a water-soluble, nonionic, surface-active additive based on polyethers, a water-soluble, surface-active additive comprising carboxylate groups, a polyurethane, and an anionic, surface-active additive based on acidic phosphoric, phosphonic, sulfuric or sulfonic esters;
(C) further components comprising no pigments, wherein component (C) comprises 0.1% to 5% by weight, based on the total weight of the preparation, of an antioxidant, and
the sum of all components (A), (B), and (C) comprise 100% by weight of the solid silica preparation.
2. The preparation according to claim 1 , wherein component (C) comprises 10% to 30% by weight, based on the total weight of the preparation, of a filler which has no intrinsic color.
3. The preparation according to claim 1 , wherein component (B) has a fraction of 30% to 50% by weight, based on the total weight of the preparation.
4. A method of producing a solid silica preparation according to claim 1 , comprising
(a) wet-comminuting the aqueous suspension comprising components (A) and, optionally, (C) and also at least part of component (B);
(b) optionally adding the remaining part of component (B); and
(c) drying the suspension.
5. A method of introducing a solid silica preparation according to claim 1 into high molecular mass organic or inorganic materials, comprising
incorporating the solid silica preparation, optionally after introduction into a suitable solvent, into the high molecular mass organic or inorganic material.
6. The method according to claim 5 , wherein the incorporation comprises stirring or shaking.