Patent GB-882769-A (GB)
Title: New 4:4-diaminostilbene-disulphonic acid derivatives and their use as optical brightening agents
Filed: 1960-07-21
Abstract: New derivatives of 4,41-diaminostilbene-disulphonic acids of general formula (I), <FORM:0882769/III/1> in which each substituent R represents a lower alkyl or a lower alkoxy-alkyl radical, both containing at least one hydroxy group, and their ammonium and alkali metal salts are used in combination with detergents as brightening agents for organic materials. Suitable detergents are, for example, soaps; salts of sulphonate detergents, e.g. salts of sulphonated benzimidazoles substituted in the 2-position by higher alkyl radicals; salts of monocarboxylic acid esters of 4-sulphophthalic acid with higher fatty alcohols; salts of fatty alcohol sulphonates, alkylaryl-sulphonic acids or condensation products of higher fatty acids with aliphatic hydroxy-or amino-sulphonic acids; or non-ionic detergents such as polyglycol ethers derived from ethylene oxide and higher fatty alcohols, alkyl phenols or fatty amines.  These detergents may also contain conventional additives such as alkali metal carbonates, phosphates, pyrophosphates, polyphosphates, metaphosphates, silicates, perborates or perecarbonates. Alternatively detergents consisting wholly or mainly of inorganic compounds may be used.  In general from 0,01 to 5% of the brightener based on the weight of the detergent may be used.ALSO:<FORM:0882769/IV (a)/1> New derivatives of 4,41-diamino stilbene-disulphonic acids of the general formula (1) in which each substituent R represents a lower alkyl or a lower alkoxy-alkyl radical, both containing at least one hydroxy group, and their ammonium and alkali metal salts, are used as brightening agents and may be added to a viscose solution used for the manufacture of foils or filaments or to a spinning solution of a linear synthetic polyamide.ALSO:The invention comprises new derivatives of 4 : 41-diaminostilbene-disulphonic acids of the general formula <FORM:0882769/IV (b)/1> in which each R represents a lower alkyl group or a lower alkoxy-alkyl group, both containing at least one hydroxyl group and the disodium salt of formula <FORM:0882769/IV (b)/2> The "lower" groups are those having not more than 5 carbon atoms.  The acids and their salts may be prepared by condensing 2 mols of cyanuric chloride with 1 mol of 4 : 41-di-aminostilbene-2 : 21 disulphonic acid or a salt thereof and with 4 mols of a lower aliphatic polyhydric alcohol containing at least 2 hydroxyl groups. If desired the 4 mols may be composed of more than one polyhydric alcohol.  Suitable alcohols are, for example ethylene glycol, 1,2-propylene glycol, 1.3-propylene glycol, 1.3-butylene glycol or pentaerythritol. Preferably the condensation is carried out in an aqueous medium in the presence of a promoter such as acetone, and in the presence of an acid acceptor.  Examples are given of the preparation of the disodium salts of acids of the above general formula in which all groups represented by R are (a) <FORM:0882769/IV (b)/3> , (b) -OCH2CH2OH (c) <FORM:0882769/IV (b)/4> , (d) -OCH2CH2CH2CH2CH2OH (e) -OCH2CH2OCH2CH2OH In the preparation of the disodium salt of acid (a) the compound of formula <FORM:0882769/IV (b)/5> is obtained as an intermediate by reacting cyanuric chloride with the sodium salt of 4.41-diaminostilbene-2.21-disulphonic acid.ALSO:New derivatives of 4,41-diaminostilbene-disulphonic acids of the general formula <FORM:0882769/IV (c)/1> in which each substituent R represents a lower alkyl or a lower alkoxy-alkyl group, both containing at least one hydroxy group, and their ammonium and alkali metal salts, are used as optical brightening agents for organic materials.  They may be added, for example, to paper pulp or applied to textile materials (a) in admixture with colouring matter as additives to dyebaths or printing, discharging or resist pastes or in after-treating dyeings, prints or discharge prints; or (b) in admixture with dressing agents such as starch or synthetically produced dressing agents, for example liquors used for producing an anticrease finish.  Suitable textile materials are, for example, in the form of fibres, filaments, yarns, woven or knitted fabrics or felt and may consist of natural materials, e.g. wool, cotton, hemp, flax, linen, jute and ramie, or semi-synthetic materials such as viscose rayon, cellulose butyrate and cellulose acetate or synthetic materials such as nylon.