A method for modifying the faerber's behavior of cotton threads, yarns made of other vegetable fibers and plastic silk yarns made of regenerated celluloses

摘要

325,961. Chemical Works, formerly Sandoz. Oct. 22, 1928, [Convention date]. Yarns &c., treating with liquids.-Threads of vegetable fibres such as cotton and regenerated cellulose (nitro, cuprammonium, and viscose) and the like are immunized against the usual cotton dyes such as substantive dyes, vat dyes, sulphur dyes, and the like in package form as cops, cones, cakes, cheeses, warp threads on beams, and the like, thus eliminating the unwinding and rewinding operations and reducing the amount of shrinkage usually associated with these immunizing operations. The process consists of treating the package first in an alkaline bath made up of caustic soda, potash, or ammonia dissolved in either water or 95 per cent alcohol, the solution containing also pyridine, turkey red oil, soap or the like. After the thread surface has been alkalized, the excess of alkali is removed in a centrifuge or by other suitable means, and the packages are then mounted in a machine wherein an esterifying agent in solution is applied under pressure to the package. As esterifying agents may be used a carboxylic acid chloride such as benzoyl chloride or a sulpho-chloride such as paratoluol - sulpho - chloride, benzo-sulpho-chloride, ortho-toluol-sulpho-chloride, xylol- and naphthalene sulpho-chlorides or the chlorine, bromine, and nitro-derivatives of all these compounds. Inorganic acid chlorides such as phosphorus trichloride can also be used. As solvents, carbon tetrachloride or other chlorinated hydrocarbons of the fatty series, benzoyl and its homologues, may be used and solutions containing 20 per cent of the reagent are suitable. The excess of esterifying agent is removed by centrifuge or the like, and the package is washed with soap solution under pressure in the same machine, centrifuged, and dried.