Patent GB-794764-A (GB)
Title: A process for treating textile materials to render them resistant to shrinkage
IPC: D06M13/248
Filed: 1955-12-06
Abstract: Cellulosic material, such as a fabric of cotton or regenerated cellulose, is reacted with an alkali metal polysulphate or an alkali metal polysulphonate of an aliphatic or aralkyl hydrocarbon, or an oxygenated derivative thereof, in the presence of an aqueous alkali metal hydroxide.  The organic compounds are ones which have two or more alkali metal sulphate groups or alkali metal sulphonate groups, per molecule attached to aliphatic carbon atoms and may be the sodium salts of 2-hydroxy-1,3-propane disulphonic acid; 1,4-dihydroxy-2,3-butane disulphonic acid; 1,2-dihydroxy-1,2-ethanedisulphonic acid; 2-hydroxy-2-methyl-3, 4-butane disulphonic acid; 3-hydroxy-3-methyl-1,2-butane sulphonic acid; or 3-hydroxy-3-methyl-1,2-pentane disulphonic acid; sulphates of glycerol; bis-(potassium disulphatoethyl) ether; the bisulphite addition product of the condensation product of 2 mols. of epichlorhydrin and one mol. of bisphenol or the bisulphite adduct of glyoxal.  The alkali metal hydroxide may be of sodium, lithium or potassium.  The organic compound and the alkali metal hydroxide may be applied to the material simultaneously or successively in either order in aqueous solutions or emulsions, by spraying or by immersion. When the organic compound is applied first it may be in the form of the free acid and the quantity of alkali metal hydroxide in the second treatment should be in excess of that required for neutralization. The temperature of the treating solutions may vary from room temperature to the boiling point of the solution.ALSO:Cellulosic material, such as a fabric of cotton or regenerated cellulose, is reacted with an alkali metal polysulphate or an alkali metal polysulphonate of an aliphatic or aralkyl hydrocarbon, or an oxygenated derivative thereof, in the presence of an aqueous alkali metal hydroxide.  The organic compounds are ones which have two or more alkali metal sulphate groups or alkali metal sulphonate groups, per molecule attached to aliphatic carbon atoms and may be the sodium salts of 2-hydroxy-1,3-propane disulphonic acid; 1,4-dihydroxy-2,3-butane disulphonic acid; 1,2-dihydroxy-1,2-ethanedisulphonic acid; 2-hydroxy-2-methyl-3,4-butane disulphonic acid; 3-hydroxy-3-methyl-1,2-butane sulphonic acid; or 3-hydroxy-3-methyl-1,2-pentane disulphonic acid, sulphates of glycerol; bis(potassium disulphatoethyl) ether; the bisulphite addition product of the condensation product of 2 mols. of epichlorhydrin and one mol. of bisphenol or the bisulphite adduct of glyoxal.  The alkali metal hydroxide may be of sodium, lithium or potassium.  The organic compound and the alkali metal hydroxide may be applied to the fabric simultaneously or successively in either order in aqueous solutions or emulsions, by spraying or by immersion. When the organic compound is applied first it may be in the form of the free acid and the quantity of alkali metal hydroxide in the second treatment should be in excess of that required for neutralization.  The temperature of the treating solutions may vary from room temperature to the boiling-point of the solution.