Patent GB-737947-A (GB)
Title: Acid-fading inhibitors
IPC: D06P1/645
Filed: 1953-05-22
Abstract: Dyeings on textile materials of cellulose esters of organic acids or cellulose ethers are rendered resistant to acid fading by the application of an inhibitor of the general formula <FORM:0737947/IV (c)/1> wherein R1, R2 and R3 represent identical or different hydrocarbon radicals in each of which a beta carbon atom is joined by a single bond to an aliphatic alpha carbon atom and by a double bond (ethylenic or benzenoid) to a gamma carbon atom. The inhibitor is most conveniently applied from aqueous emulsion (e.g. by the process of Specification 665,401), advantageously at the same time as the dyestuff.  Alternatively the dyed material may be treated with a solution of the inhibitor in a solvent (e.g. benzene or toluene) which does not dissolve the cellulose derivative, or the inhibitor may be added to printing pastes or to powdered dyes to be used therein, or it may be dispersed in a lubricant or size of the type used for treating cellulose derivative textile materials.  In examples, cellulose acetate fabric is dyed from baths prepared by dispersing in an aqueous solution of potassium pyrophosphate, with the aid of turkey red oil and green soap, the blue dye 1-(b -hydroxyethylamino)-4-methylaminoanthraquinone and a solution of various amounts of tribenzyltrimethylenetriamine in acetone.ALSO:Compositions, especially textile materials, comprise an organic polymer (e.g. a cellulose ester of a carboxylic acid, a cellulose ether or polyethylene terephthalate) and, as an inhibitor of the acid fading of dyeings thereon, a compound of the general formula <FORM:0737947/IV (a)/1> wherein R1, R2 and R3 represent identical or different hydrocarbon radicals in each of which a beta carbon atom is joined by a single bond to an aliphatic alpha carbon atom and by a double bond (ethylenic or benzenoid) to a gamma carbon atom. The inhibitor, which is preferably present in an amount of 0.1 to 5.0 per cent of the weight of the organic polymer, may be added to a solution of the organic polymer which is subsequently extruded to form filaments or cast to form films.  In examples, triallyl-, monoallyl-dibenzyl- or tri-(a -methylbenzyl) - trimethylenetriamine is added, together with the blue dye 1-methylamino-4-hydroxyethylaminoanthraquinone, to a spinning solution of cellulose acetate in acetone.  Specification 665,401, [Group IV (c)], is referred to.ALSO:Compounds of the general formula <FORM:0737947/IV (b)/1> wherein R1, R2 and R3 represent identical or different hydrocarbon radicals in each of which a beta carbon atom is joined by a single bond to an aliphatic alpha carbon atom and by a double bond (ethylenic or benzenoid) to a gamma carbon atom, are prepared by reacting formaldehyde with the appropriate amine or mixture of amines.  Advantageously the formaldehyde is employed as an aqueous solution and the reaction is commenced at -5 DEG  to +5 DEG C., the temperature being permitted to rise to 15-25 DEG  C. as the reaction proceeds.  The preparation of triallyl-, monoallyl-dibenzyl- and tri - (a  - methylbenzyl) - trimethylenetriamine is described in detail.  The products are useful as acid-fading inhibitors for dyeings on organic polymers (see Groups IV (a) and IV (c)). Specification 665,401, [Group IV (c)], is referred to.