Patent GB-542150-A (GB)
Title: Process for imparting a matt appearance and water-repellent properties to textile materials
IPC: D06M13/432
Filed: 1940-06-26
Abstract: 542,150. Treating textiles with liquids waterproofing. SOC. OF CHEMICAL INDUSTRY IN BASLE. June 26, 1940, Nos. 10913 and 10914. Convention dates, June 30, 1939, and June 1, 1940. [Class 15 (ii)] [Also in Group VIII] Textiles, yarns, fabrics, and other materials particularly of regenerated cellulose are given a mat appearance and water-repellent properties by impregnating them with a liquid containing a condensation product of formaldehyde with urea, thiourea, guanyl urea, biuret, melamine, or similar compound, and a compound of the formula where R is an organic residue containing at least one aliphatic or cycloaliphatic radical having at least 8 carbon atoms, X is an oxygen or sulphur atom or the group -COO- or -NR 4  where R 4  is hydrogen or a residue of a | substicuted or unsubstituted hydrocarbon, and R 1  R  2  R 3  are hydrogen atoms or alkyl radicals. If the thiourea compound of the above formula is not of acid re-action or does not split off acid during the treatment, a substance of acid re-action or substance liberating acid is included in the treatment liquid. The treatment is continued until the textile has become matted whereupon the treated material is dried and it may also be subjected to' a heat treatment. If desired impregnation with the two kinds of re-agent may be carried out in separate baths. The treated materials have a soft feel. If the treatment is such that the materials still contain a considerable proportion of a water soluble urea-formaldehyde or like condensation product in addition to a precipitated insoluble product, at the time of starting the drying or heat treatment, anticreasing properties will also be imparted. The thiourea derivatives may be obtained. e.g. by condensing sym-dichlorodimethyl ether with stearamide or with the amide of hydrogenated whale oil fatty acids or with the N- methylamide of stearic acid or with the anilide of stearic acid and then causing the condensation product to re-act with thiourea, or by causing the methylolamide of stearic acid to re-act with thiourea in presence of hydrochloric acid. In an example, viscose rayon is treated with a solution containing a re-action product of thiourea with the condensation product of sym-dichlorodimethyl ether and stearamide, monomethylolurea, and hydrochloric acid. The material is rinsed and then dried at raised temperature. Viscose rayon is padded in a solution containing dimethylolurea, ammonium chloride, and the re-action product of stearic acid methylolamide and thiourea. It is dried and then heated at 140‹ C. The material has a mat appearance, is strongly water-repellent, has a soft feel, and is crease-resistant. Specifications 527,008, 527,012, and 537,221, are referred to. The Specification as open to inspection under Sect. 91 is not restricted to the use of thiourea derivatives but comprises the use of compounds of the general formula R-X-CH  2 - -Y-Z in which R and X have the meanings set forth above, Y stands for sulphur or oxygen or the group -O-C =O, and Z is a residue   | containing a group imparting solubility in water. This subject-matter does not appear in the Specification as accepted.