GB326567A - Process for protecting wool, fur, hair and the like against textile pests - Google Patents

Abstract

326,567. Carpmael, A., (I. G. Farbenindustrie Akt.-Ges.). Dec. 20, 1928. Proofing against vermin; proofing-compositions. -Materials such as wool, fur and hair are protected from textile pests such as moth by incorporating therewith a thiourea of the formula in which R signities an alkyl, alkylene, cycloalkyl, aralkyl, or an aryl residue, and R1 an acid residue. The substituent R may be for example allyl, cyclohexyl, benzyl, phenyl, tolyl, methoxy-phenyl, chloro-tolyl, or trichlorophenyl. and the. acid residue R1 that. of acetic, valeric, stearic, oleic or benzoic acid, or of substitution products of these acids, such as dichlorobenzoic acid, phenylacetic acid, p-chlorophenoxyacetic acid, hexahydrobenzoic acid, &c. Thioureas containing one amino group substituted by an alkyl, aryl &c. residue are produced in the usual manner, for example by the interaction of an aryl mustard oil with ammonia, or the interaction of primary bases with thiocyanate, or, particularly in the production of aliphatic compounds, the interaction of the dithiocarbamine acid salts with mercuric chloride. The mono-substituted ureas thus obtained are dissolved in a solvent such as pyridine or dimethylaniline and treated with an acid chloride, for example, caproic acid chloride or valeric acid chloride. After conversion, the mass is acetylated with hydrochloric acid while cooling, and the separated mixed substituted thiourea is filtered and recrystallized from an organic solvent such as alcohol The substituted thioureas obtained are dissolved in alcohols, benzene, benzine, cyclohexanone, carbon tetrachloride and other organic solvents or mixtures thereof. The strength of the solution used is such that about 1 to 2 per cent of the active substance remains on the fibre. In one example, the material to be protected is treated with a solution of phenyl valeryl thiourea in such a manner that after drying 1 to 2 per cent of the substance remains. Oleyl, benzoyl, dichlorobenzoyl and similar derivatives may be used in place of the valeryl compound. In a second example the material is treated with a solution of phenylcapronyl-thiourea in such strength that after centrifuging and drying 1 per cent of the substance remains on the material.