Patent GB-181391-A (GB)
Title: Improvements relating to the dyeing of alkyl celluloses
IPC: D06P3/58
Filed: 1922-06-12
Abstract: Cellulose alkyl ethers which are insoluble in water at 16 DEG C but swell or dissolve in water at lower temperatures, are swollen by treatment with water at an appropriate temperature and dyed with substantive, acid, basic, mordant, vat or sulphur dyes. The water used for swelling may contain glycerine, sugars, soaps, Turkey-red oil, acids, etc.; the swelling operation may be effected in a separate bath prior to dyeing, or in the dye-bath itself at a low temperature, the temperature being subsequently raised, if necessary, for the dyeing operation. The cellulose ethers may be in the form of artificial silk, films, plastic masses, or coatings on fabric, artificial leather, book cloth, &c., and may be mixed with other cellulose derivatives (nitrates, acetates, or formates) or other colloids, softening or plastifying-agents (camphor, camphor substitutes, naphthalene or its derivatives, phosphoric esters of phenols, high-boiling hydrocarbons, oils, fats, &c.), or filling materials, (china clay, chalk, zinc white, lithopone, &c.). The products may be treated, before, during, or after the dyeing, with tanning-agents or agents capable of precipitating albumens, such as tannic acid, tannins, alum, chrome alum, &c. to increase their resistance to water.ALSO:Cellulose alkyl ethers which are insoluble in water at 16 DEG C but swell or dissolve in water at lower temperatures are swollen by treatment with water at an appropriate temperature and dyed with substantive, acid, basic, mordant, vat or sulphur dyes.  The cellulose ethers may be in the form of artificial silk, films, plastic masses, or coatings on fabric, artificial leather, book cloth, &c. and may be mixed with other cellulose derivatives (nitrates, acetates, or formates), softening or plastifying-agents (camphor, camphor substitutes, naphthalene or its derivatives, phosphoric ethers of phenols, high-boiling hydrocarbons, oils, fats, &c.) or filling materials (china clay, chalk, zinc white, lithopone, &c.).  The products may be treated, before, during, or after the dyeing, with tanning-agents or agents capable of precipitating albumens, such as tannic acid, tannins, alum, chrome alum, &c. to increase their resistance to water. Specifications 181,392, 181,393, and 181,395 are referred to.  The Specification, as open to inspection under Sect. 91 (3) (a) contains a list of dyes of the various classes referred to, which are suitable; and it also refers to the addition to the water used for swelling of glycerine, soaps, sugars, Turkey-red oil, acids, etc.; and also to the use of the dye-bath in the swelling operation, the temperature of the bath being subsequently raised, if necessary for the dyeing operation. And it also stated that the dye-baths may contain the usual assistants, &c. as in the dyeing of wool, cotton, or silk; and that the dyeings with substantive dyes may be diazotized on the fibre and developed with b -naphthol, phenol, resorcin, ethyl-b -napthylamine, m-phenylenediamine, m-toluylenediamine, &c.  This matter does not appear in the Specification as accepted.