Abstract: The invention relates to a process for manufacturing a particulate titanium dioxide product, wherein hydrated titanium dioxide is precipitated from an aqueous solution of titanium oxychlioride by adding to the solution titanium dioxide particles as crystal nuclei and the product obtained from the precipitation step is isolated and optionally calcined. The process is characterized by the addition of crystal nuclei to an aqueous solution of titanium oxychloride having a content of >90 g TiO2/l calculated as TiO2 and the performance of precipitation at a temperature below the boiling point of the said aqueous solution and at normal pressure. In addition, the invention relates to a titanium dioxide product prepared by using the process, the use of the product as a photocatalyst, and a photocatalyst, which comprises a titanium dioxide product prepared according to the invention.

Abstract: Inorganic light-absorbing micropigments to which aluminium phosphates are applied are used in sunscreens or cosmetics emulsions.

Abstract: The mixture consists of c) from 5 to 60% by weight of titanium dioxide onto which organic and/or inorganic auxiliaries can be applied, as component A, d) from 40 to 95% by weight of an organic micropigment dispersion as component B, consisting of b1) from 20 to 75% by weight of at least one methyleoebisbenzo-triazolylphenol in which the benzotriazolyl radicals and phenol radicals can each be independently substituted by one or more C1-20 alkyl radicals, C1-20 alkoxy radicals, C1-20 hydroxyalkyl radicals, C6-12 aryl radicals, halogen, hydroxyl groups or cyano groups, as organic micropigment B1, b2) from 2 to 15% by weight of at least one emulsifier B2, b3) from 0.5 to 5% by weight of organic auxiliaries B3, b4) from 22.5 to 77.5% by weight of water as component B4, the total amount of components B1 to B4 giving 100% by weight, with up to 20% by weight of the mixture being able to be replaced by other constituents.

Abstract: The invention relates to a photocatalyst containing titanium dioxide, to a method for using it and to its application. A sulphurous titanium dioxide hydrate precipitate is precipitated from an acid titanium oxysulphate solution at a temperature below the boiling point of the solution, e.g. in the range from 70 to 100° C., using crystal nuclei and without addition of base. The precipitate is separated, washed and calcinated. The photocatalytic titanium dioxide thus obtained has a specific area in the range from 100 to 250 m2/g and a 0.3 to 5% sulphur concentration. Catalytic activity has been confirmed in asetal dehyde decomposition and in anionic (SNC?)2 radical formation.

Abstract: The invention relates to a photocatalyst containing titanium dioxide, to a method for using it and to its application. A sulphurous titanium dioxide hydrate precipitate is precipitated from an acid titanium oxysulphate solution at a temperature below the boiling point of the solution, e.g. in the range from 70 to 100° C., using crystal nuclei and without addition of base. The precipitate is separated, washed and calcinated. The photocatalytic titanium dioxide thus obtained has a specific area in the range from 100 to 250 m2/g and a 0.3 to 5% sulphur concentration. Catalytic activity has been confirmed in asetal dehyde decomposition and in anionic (SNC?)2 radical formation.

Abstract: A less dusty, more stable and more easily handlable protector against UV light than previously is obtained by supplying it in the form of solid particles having a mean diameter of at minimum 10 .mu.m and containing, dispersed in 90-20 parts by weight of wax, 10-80 parts by weight of a pigment which reduces the penetration UV light and is made up of metal oxide particles of a mean primary particle diameter smaller than 0.150 .mu.m.

Abstract: The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a ferric sulfate slurry. When so desired, the obtained ferric sulfate slurry is solidified to form solid ferric sulfate. The obtained ferric sulfate may, as such or dissolved in water, be used for the treatment of waste waters or for preparing pure tap water.