Patent GB-334563-A (GB)
Title: Improvements in or relating to the production or treatment of materials made of or containing cellulose esters or ethers
IPC: D01F2/28
Filed: 1929-03-28
Abstract: 334,563. British Celanese, Ltd., Taylor, W. L, Roberts, R. P., and Gregory, L. W. March 28, 1929. Right to Patent relinquished. Yarns &c., treating with liquids. - Opaque relatively insoluble metallic compounds are formed in filaments, threads, yarns, ribbons, fabrics, and like materials, made of or containing cellulose acetate or other cellulose esters or ethers and manufactured by processes comprising spinning solutions of said esters or ethers, by interaction of reagents one of which is introduced into the spinning solution while another is applied to the materials during or after their formation into filaments, threads, or the like. Suitable salts comprise insoluble salts of lead or barium, for example lead sulphate, barium sulphate or barium phosphate. The materials thus produced possess a reduced or subdued lustre and the normal lustre is not in general restored by treating the goods in a damp condition with a hot iron. Moreover the materials are less inflammable and resist higher temperatures than the untreated materials. Of the two reagents from which the metallic compound is formed, that which contains the metallic radicle is preferably introduced into the spinning solution, the other being employed as a fixing solution, thus, for example, a barium salt soluble therein may be introduced into the spinning solution and subsequently fixed in the material by treatment with a soluble sulphate. As fixing agents there may be employed, for example, sulphuric acid or a soluble salt thereof, disodium hydrogen phosphate or water preferably containing small amounts of alkali, for example, ammonia, caustic soda or lime. When the metallic radicle is introduced into the formed materials, these may be in a swollen condition (see Specifications 258,874, 259,899, 279,502, 281,084, 284,798, 285,941; and 329,659, [Class 15 (ii), Dyeing, Processes &c. for]). The treatment with the fixing solution may be applied continuously with the production of the filaments or threads either by wet or dry spinning processes. In an example, a solution of cellulose acetate in acetone containing barium thiocyanate is dry spun and the yarn obtained with or without intermediate washing is treated with a heated solution of sodium sulphate either continuously with the production of the yarn or separately therefrom. The delustred yarn is finally washed and dried. The processes for forming opaque metallic compounds in the materials may be combined with the application to the materials of weighting or mordanting agents, for example by the methods described in the Specifications referred to above and also in Specifications 273,692, 273,693, 280,698, 285,948, 286,761, and 287,204, Fall in Class 15 (ii), Dyeing, Processes &c. for]. The materials may be dyed by any of the usual processes and may possess an affinity for other than the usual dyestuffs. For example, when the formation of the metallic compounds is combined with the deposition of a mordant, the materials acquire an affinity for mordant dyestuffs. Dyestuffs may be applied at any convenient stage, for instance with the fixing agent itself; thus', materials prepared from solution containing barium thiocyanate may be treated with a solution of aluminium sulphate together with a suitable acid or substantive dyestuff and after treatment the goods may be washed off, for example with water containing a small amount of soda ash or other alkali. Effect materials may be produced, for example by weaving, knitting or otherwise making up the threads or yarns in which barium sulphate has been formed with untreated yarns so as to produce effect fabrics containing both yarns or threads of normal lustre und yarns or threads of subdued lustre. The processes are particularly applicable to the manufacture of materials made of cellulose acetate or other cellulose esters or ethers, for example cellulose formate, propionate, butyrate, methyl, ethyl or benzyl cellulose or mixed materials containing such cellulose derivatives in association with other fibres, for example cotton, linen, the reconstituted type of artificial silk, silk and wool. Specifications 323,501 and 323,785 also are referred to. The Provisional Specification refers also to the treatment of the finished filaments, threads, fabrics, or the like successively with reagents to form opaque relatively insoluble metallic compounds therein, for example with a soluble salt of the metal and thereafter with a fixing solution; to the application of the metallic radicle to filaments continuously with their production by dry or wet spinning processes, for example by passing the filaments through a bath containing a solution of a barium or other metallic salt, which is itself either a swelling agent or which is used in conjunction with a swelling agent or by means of a wick supplied with such a solution, and then treating with the fixing agent; and to the treatment of the materials of normal lustre or of any stage of reduced lustre, for example materials produced or treated as described in Specifications 328,247; and 333,504, [Class 2 (ii), Cellulose &c.].