Patent GB-488193-A (GB)
Title: Improvements in the manufacture and production of dyestuff powders
IPC: C09B67/46
Filed: 1936-12-29
Abstract: Dyestuffs are obtained in a form, readily dispersible in aqueous liquids, by incorporating therewith condensation products of formaldehyde, phenols and primary or secondary amines.  The condensation products, which must be soluble in water, if necessary, in presence of acids or alkalies, are obtainable by the process described in Specification 470,335, [Group IV].  Aromatic amines not specifically mentioned in that Specification, such as metanilic acid and arylaminoethane, sulphonic acids, may be used, sulphonic acid groups being introduced subsequent to condensation, if necessary. The usual thickenings, wetting agents and inorganic salts may also be incorporated.  In the examples various dyes are kneaded with the condensation products in the presence of water until sufficiently fine, dried and ground.  The Provisional Specification refers to the use of compounds from phenol, formaldehyde and dimethylamine or diethanolamine.ALSO:Dyestuffs are obtained in a form, readily dispersible in aqueous liquids, by incorporating therewith condensation products of formaldehyde, phenols and primary or secondary amines.  The condensation products, which must be soluble in water, if necessary, in presence of acids or alkalies, are obtainable by the process described in Specification 470,335. Aromatic amines not specifically mentioned in that Specification, such as metanilic acid and arylaminoethane sulphonic acids, may be used, sulphonic acid groups being introduced subsequent to condensation, if necessary.  The usual thickenings, wetting agents and inorganic salts may also be incorporated in the dyestuff powders. In examples: (1) 1-methylamino-4-b -hydroxyethylaminoanthraquinone and the condensation product of phenol (1 mol.), formaldehyde (2 mols.) and 1-methylaminoethane-2-sulphonic acid sodium salt (1 mol.) are kneaded with water until sufficiently fine, dried and ground; the product dyes acetate artificial silk and can be worked up for printing this material; mixtures of dyestuffs of a similar nature may be used; (2) the vat dyestuff obtainable from 1-anthraquinonyl-Bz-1-aminobenzanthrone by alkali fusion according to example 1 of Specification 24604/08, [Class 2], is treated as in (1); the product is suitable for dyeing by the slop-padding process and for making printing inks and is readily vattable; (3) the sodium salt of the disulphonic acid of the dye obtained by combining 4.41-tetramethyldiaminobenzophenone with 31-ethoxyphenyl-4-tolylamine is mixed with sodium sulphate, sodium carbonate and the condensation product from phenol (1 mol.), formaldehyde (2 mols.) and N-methylaminoacetic acid sodium salt (1 mol.); (4) sodium leuco sulphuric ester of 4 - (21.51 - dichlorbenzoylamino) - 1.9 - anthrapyrimidine is mixed with an aqueous solution of the reaction product of phenol (1 mol.), formaldehyde (2 mols.) and 1-butylamino-2-propane sulphonic acid sodium salt (1 mol.) and the mixture dried; an aqueous solution of the product dyes cotton or viscose artificial silk; (5) the reaction product of phenol (1 mol.), formaldehyde (2 mols.) and stearylaminoacetic acid sodium salt (1 mol.) is sulphonated and ground with copper phthalocyanine in the presence of water; the resulting paste, after drying and powdering, may be readily worked up into colours for wall-paper or coloured paper, graphic, lime or oil colours or distempers.  The Provisional Specification refers to the use of compounds from phenol, formaldehyde and dimethylamine or diethanolamine.