Patent GB-490564-A (GB)
Title: A process of making dispersions of finely-divided solids
IPC: C09C1/56
Filed: 1937-05-22
Abstract: Dispersions of finely-divided solids are obtained by treating an initial dispersion of the solids in air or other gaseous medium, i.e. a sogasoid, with the vapours of the selected dispersion medium, which is liquid at atmospheric temperatures and pressures, and then condensing the vapours to form a liquid dispersion of the solids. The dispersion medium is preferably an aqueous solution or a watersoluble gas or liquid, e.g. ammonia, sulphur dioxide, pyridine, alcohol, toluene, acetylene, acetic acid or azeotropic mixtures. Suitable finely-divided solids include carbon black, zinc oxide, ultramarine, chrome oxide, sulphur dyes, vat dyes and other dyestuffs.  Examples describe the preparation of a pulp by treating carbon black with steam containing ammonia or pyridine vapours which are then condensed to the liquid phase.  This pulp may be kneaded with alkali-cellulose, to obtain a product for colouring paper pulp. The cellulose pulp may also be treated with carbon bisulphide to form a xanthate, which on addition of alkaline water forms a black smooth paste which may be used to colour rubber latex.  The ammonia may be replaced by phosphorus pentoxide dispersed in air which is then steamed.  Other industries in which the products may be used are referred to in general terms.  Reference has been directed by the Comptroller to British Specification 348,174, and U.S.A. Specifications 2,036,570 and 2,050,193.ALSO:Dispersions of finely - divided solids are obtained by treating an initial dispersion of the solids in air or other gaseous medium, i.e. a sogasoid, with the vapours of the selected dispersion medium, which is liquid at atmospheric temperatures and pressures, and then condensing the vapours to form a liquid dispersion of the solids.  The dispersion medium is preferably an aqueous solution or a water-soluble gas or liquid, e.g. ammonia, sulphur dioxide, pyridine, alcohol, toluene, acetylene, acetic acid or azeotropic mixtures.  Suitable finely-divided solids include carbon black, zinc oxide, ultra-marine, chrome oxide, sulphur dyes, vat dyes and other dyestuffs.  Examples describe the preparation of a pulp by treating carbon black with steam containing ammonia or pyridine vapours which are then condensed to the liquid phase.  This pulp may be kneaded with alkali-cellulose, to obtain a product for colouring paper pulp.  The cellulose pulp may also be treated with carbon bisulphide to form a xanthate, which on addition of alkaline water forms a black smooth paste which may be used to colour rubber latex.  The ammonia may be replaced by phosphorus pentoxide dispersed in air which is then steamed.  Other industries in which the products may be used are p  referred to in general terms.  Reference has been directed by the Comptroller to British Specification 348,174, [Group III], and U.S.A. Specifications 2,036,570 and 2,050,193.ALSO:Finely-divided solid compounding materials are incorporated in rubber or solutions or dispersions thereof by first forming a dispersion of the solid material in a suitable liquid and subsequently incorporating this dispersion in the rubber.  The dispersions of finely-divided solids are obtained by treating an initial dispersion of the solids in air or other gaseous medium, i.e. a sogasoid, with the vapours of the selected dispersion medium, which is liquid at atmospheric temperatures and pressures, and then condensing the vapours to form a liquid dispersion of the solids.  The dispersion medium is preferably an aqueous solution or a water-soluble gas or liquid, e.g. ammonia, sulphur dioxide, pyridine, alcohol, toluene, acetylene, acetic acid or azeotropic mixtures.  Suitable finely-divided solids include carbon black, zinc oxide, ultramarine, chrome oxide, sulphur dyes, vat dyes and other dyestuffs.  Examples describe the preparation of a pulp by treating carbon black with steam containing ammonia or pyridine vapours which are then condensed to the liquid phase.  This pulp may be kneaded with alkali-cellulose, to obtain a product for colouring paper pulp.  The cellulose pulp may also be treated with carbon bisulphide to form a xanthate, which on addition of alkaline water forms a black smooth paste which may be used to colour rubber latex.  The ammonia may be replaced by phosphorus pentoxide dispersed in air which is then steamed.  Reference has been directed by the Comptroller to British Specification 348,174, and U.S.A. Specifications 2,036,570 and 2,050,193.