Patent GB-574644-A (GB)
Title: A process for rendering fabrics resistant to slip
IPC: D06M15/17
Filed: 1942-02-12
Abstract: Textile fabrics are rendered resistant to slip by treating them with a solution or dispersion of a compound of the general formula R-A-CH2-R1, in which R is a cycloaliphatic or aromatic-aliphatic residue, A is a hydroxy aryl radical, and R1 is an isothiourea residue in salt form, the solution or dispersion being free from dyestuffs, and drying and if desired heating the treated material. The fabric, e.g. a viscose rayon fabric may be impregnated at room temperature with an aqueous solution containing 1 per cent of the reagent, and the fabric is then squeezed and dried.  It may be heated to 115 DEG -150 DEG  C.  The fastness of dyeings is improved, particularly in the case of viscose rayon and other materials dyed with dyes containing sulphonic acid groups.  The treating agent may be derived from addition products, particularly resinous products, of phenol, cresol, or other alkylated phenol with terpenes such as dipentene or terpene alcohols, or with resin acids such as abietic acid or colophony.  Such water-insoluble intermediate compounds can be prepared from their components with the aid of hydrochloric, sulphuric, or p-toluene sulphonic acid at 0 DEG -35 DEG  C.  There may be used compounds derived from 1 : 1-di-(p-hydroxyphenyl)-ethane, dihydroxydiphenyl methane, or dihydroxy diphenyl-dimethyl methane, or from condensation products of formaldehyde and aromatic hydroxy compounds, e.g. phenol-formaldehyde products soluble in organic solvents.  The hydroxyaryl compound may be converted into a compound of the above general formula by reacting it with formaldehyde, and a thiourea capable of reacting in iso-form, and an acid.  The treating agent may also be obtained by treating phenol or resorcinol with formaldehyde, thiourea, and an acid at 100 DEG  C.  In this reaction nuclear condensations occur so that at least 2 oxyaryl radicals are linked through a methylene bridge.  In an example, a solution of the formate of an isothiourea derivative (obtainable by heating the phenolic addition product of phenol and dipentene with a solution of thiourea, formaldehyde, and hydrochloric acid, treating the product with very dilute warm hydrochloric acid, dissolving the residue in warm alcohol, and pouring into dilute formic acid) is prepared, and a viscose rayon fabric, having a tendency to slipping of the threads, is impregnated with the solution.  The fabric is squeezed, dried, and heated.  Other examples describe: the production of an isothiourea salt by heating a colophony-phenol condensation product, dissolved in isopropyl alcohol, with formaldehyde and thiourea hydrochloride, then adding formic acid and pouring into water; the production of an isothiourea hydrochloride compound by heating 1 : 1-di-(p-hydroxyphenyl)-ethane, thiourea, formaldehyde, and hydrochloric acid; and the production of an isothiourea salt by heating phenol, thiourea, formaldehyde, and hydrochloric acid.  The Specification as open to inspection under Sect. 91 comprises also the use of compounds of the above formula in which R1 is any residue which imparts or enhances solubility in water and contains at least one basic nitrogen atom.  The residue R1 may be a quaternary ammonium group, an amino- or iminogroup in salt form, or a residue derived from dicyandiamide and neutralized with an acid.  This subject-matter does not appear in the Specification as accepted.