Patent GB-970956-A (GB)
Title: Process for dyeing woollen yarn
IPC: C09B45/14
Filed: 1962-05-10
Abstract: Compounds of the formula <FORM:0970956/C1/1> wherein R1 and R2 are aliphatic hydrocarbon residues, R1 having at least 12 and R2 at least 11 carbon atoms, m and n being whole numbers of which the sum m+n is 6-20, preferably 9-13, are esterified with an excess of polybasic acid, e.g. orthophosphoric or succinic acid-sulphonic acid or, preferably, maleic, succinic, furandicarboxylic, saccharic, acetic acid-sulphonic acid or sulphuric acid, or reactive derivatives thereof, e.g. chlorosulphuric acid, sulphamic acid, maleic anhydride or urea phosphate. In the case of using urea phosphate or sulphamic acid the ammonium salt is obtained immediately, otherwise the free acids are converted to water-soluble salts with alkalies, e.g. alkali metal or ammonium hydroxides.  Compounds of the formula <FORM:0970956/C1/2> are obtained by reacting a compound of the formula <FORM:0970956/C1/3> which may be N-dodecyl-, N-tetradecyl-, N-hexadecyl-, N-octadecyl-, N-eicosyl, N-docosyl-, N-octadecenyl- or N-octadecan-dienyl-propylene-diamine or mixtures of the above especially a propylenediamine in which one amino group contains the hydrocarbon residue corresponding to soybean fatty acid, with a fatty acid of at least 12 carbon atoms or a functional derivative thereof, e.g. acyl chlorides, which acids may be lauric, myristic, palmitic, stearic, arachic, behenic, oleic acid or mixtures thereof, e.g. coconut oil fatty acids and commercial stearic acid.  The resulting compound of the formula <FORM:0970956/C1/4> is then reacted with suitable amounts of ethylene oxide.ALSO:Woollen yarn is dyed with 1:2-chromium or -cobalt complexes of monoazo dyes from a neutral to weakly acidic dyebath in the presence of inert, water-insoluble organic solvents and water-soluble salts of acid esters derived, on the one hand, from polybasic acids and, on the other, from hydroxy compounds of the formula <FORM:0970956/D1-D2/1> in which R1 and R2 are aliphatic hydrocarbon residues, R1 containing at least 12 and R2 at least 11 carbon atoms, m and n being whole numbers of which the sum m + n is 6 - 20.  The assistant derived from a compound of the above formula is preferably an ammonium salt of an acid sulphuric acid ester where R1 represents a hydrocarbon residue corresponding to soybean fatty acid and R2-CO- represents an oleic acid residue and m + n is 9 - 13 (see also Division C2). Suitable dyestuffs are derived from two identical molecules of dyestuff or two different dyestuff molecules which are preferably free of sulphonic and carboxylic acid groups not participating in complex formation.  The complex forming grouping may be an o-hydroxy-o1-aminoazo, o-hydroxy-o1-carboxyazo or preferably an o:o1-dihydroxyazo grouping.  A number of dyestuffs are specified.  The specified inert, water-insoluble organic solvents are liquid aliphatic, cycloaliphatic or aromatic hydrocarbons or mixtures thereof, octadecylene, castor oil, dioctyl phthalate, pine oil, and especially paraffin oil. The two afore-mentioned assistants may be added separately to the dyebath but it is preferred to add them as a stable aqueous preparation containing both assistants in suitable proportions as well as dispersants e.g. sodium dinaphthylmethane disulphonate or the reaction product of 1 mol oleyl alcohol with 6 mols ethylene oxide, and anti-foam agents, e.g. a silicone.  Examples of dyeing woollen yarn in a hank dyeing apparatus (single- and two-pole suspension systems) are given.