GB900752A - Polymer-dyestuff reaction products - Google Patents

Abstract

Polymer-dyestuff reaction products are obtained by reacting, in an aqueous medium and in the presence of an acid-binding agent, a natural or synthetically produced high molecular weight polymer, which is soluble in water or aqueous alkali and which contains a plurality of free hydroxyl groups, with a dyestuff containing a reactive atom or group (which is capable, in the presence of an acid-binding agent, of reacting with the hydroxyl groups of the polymer with the formation of a covalent bond), or with a dyestuff intermediate which contains such a reactive atom or group, and in the latter case, subsequently converting the polymer-dyestuff intermediate reaction product so-obtained into a polymer-dyestuff reaction product by a process appropriate to the particular dyestuff. Specified polymers are soluble cellulose ethers containing free hydroxyl groups such as methyl-, ethyl-, hydroxyethyl- and carboxyalkyl-cellulose, the sulphuric acid monester of hydroxyethyl cellulose and phosphonomethylated cellulose; soluble higher polysaccharides and derivatives thereof containing free hydroxyl groups such as soluble starches, dextrin, starch-sodium glycollate, pectins, alginates, gum arabic, guaran and like vegetable mucilages; and polyvinyl alcohol. Specified reactive dyestuffs are those of the oxazine, triphenylmethane, xanthene, nitro, acridone, perinone, azo, anthraquinone and phthalocyanine series containing as reactive groups epoxy, ethylene imino, isocyanate, carbamic acid aryl ester, propiolic acid amide, acrylamino, vinylsulphone, aliphatically bound sulphuric acid ester, aliphatically bound sulphonyloxy or halogen groups, and in the latter case, the halogen atoms may be present in an aliphatic acyl residue or in a heterocyclic residue, such as a pyrimidine ring or preferably a triazine ring. When a reactive dyestuff intermediate is employed it may be a diazotizable amine containing a reactive group, or an azo dyestuff coupling component containing a reactive group, diazotization and coupling, or coupling with a diazo compound, being subsequently effected respectively. Alternatively (as exemplified in Examples 21 and 22), the intermediate may be 2 - chloro - 4(31 - sulphophenyl) - amino - 6(31-amino-41-sulpho-phenyl)amino-1:3:5-triazine or 2 - chloro - 4(b - aminoethyl) - amino - 6 - - (21:51-disulphophenyl)-amino-1:3:5-triazine in which case the reaction product is subsequently condensed with copper phthalocyanine 3:31:311:3111-tetrasulphonyl chloride. Suitable acid-binding agents are alkali metal hydroxides, carbonates, bicarbonates and phosphates. The reaction is preferably effected at room or slightly higher temperature and the reaction product may be precipitated by the addition of alcohol or by neutralization. Insoluble reaction products may be solubilized by grinding in alcoholic suspension to a particle size of 5 microns or less. The coloured reaction products may be used for spin-dyeing viscose or cuprammonium rayon (see Example 37) and for dyeing already formed fibres (see Group IV(c)). Most of the examples describe the manufacture of reaction products of various cellulose ethers with various reactive dyestuffs, or with various azo dyestuff components followed by coupling, or diazotization and coupling. Example 24 describes the reaction of polyvinyl alcohol with a reactive diazotizable amine followed by diazotization and coupling, Example 25 the reaction of a soluble starch with a reactive azo or anthraquinone dyestuff, and Examples 26, 28, 29, 30 and 31 the reaction of a soluble starch, starch sodium glycollate, dextrin, sodium alginate, the sodium salt of pectin, guaran or gum arabic with a reactive diazotizable amine followed by diazotization and coupling. Specifications 866,513 and 867,571 are referred to.ALSO:The products obtained by reacting a natural or synthetically produced high molecular weight polymer which is soluble in water or aqueous alkali and which contains a plurality of free hydroxyl groups, with a reactive dyestuff (see Group IV(a)), are employed for dyeing fibres. In Example 36 the reaction product of an alkali soluble hydroxyethyl cellulose and a reactive azo or reactive phthalocyanine dyestuff is employed in solution in aqueous caustic soda for dyeing cotton or fibres of glass, polyesters, polyamides, polyacrylonitrile, cellulose acetate or cellulose triacetate.