Patent GB-425131-A (GB)
Title: Improvements in the treatment of artificial filaments, threads, ribbons and like materials
IPC: D06P1/56
Filed: 1933-09-13
Abstract: Treatments of artificial filaments, fabrics, and the like of organic derivatives of cellulose for the purpose of modifying the colour or lustre, are effected in the presence of a condensation product of an aldehyde such as formaldehyde, acetaldehyde, and benzaldehyde, with a hydroxy carboxylic acid, or with an acyclic partial ether of a di- or poly-hydric alcohol, which ether contains only one free hydroxy group.  Examples of such substances are those produced by the process of Specifications 424,837 and 424,838.  The invention is of particular importance in the colouration of materials by means of relatively water insoluble colouring materials having an affinity for organic derivatives of cellulose.  These colouring materials may be dissolved in the condensation products and added to a dye-bath containing water and, if desired, soap, turkey red oil and xylene. Alternatively, the condensation products may be added to the bath already containing the colouring material.  A further application of the condensation products is in the production of printing pastes which contain also dyestuffs and thickening agents, and in the preparation of discharge preparations.  The latter may also contain a dyestuff in order to obtain illuminated discharges.  A further application of the condensation products is as wetting agents for wetting out cellulose derivative materials prior to dyeing, delustring, and similar treatments.  Due to the action of the condensation products in increasing the permeability of the cellulose derivative materials, they may be used to facilitate delustring of the materials by means of suspensions containing finely divided pigment-like materials such as titanium dioxide, antimony trioxide, stannic oxide, starch, high melting insoluble organic compounds, and the like.  The condensation products may be present in baths used for mordanting and weighting filaments, fabrics, and the like.  The condensation products are preferably employed with water, benzene, or other diluent.  In examples, a cellulose acetate fabric is dyed blue in a bath of water to which has been added a condensation product of formaldehyde and the mono-methyl ether of ethylene glycol, and 1, methylamino-4, hydroxy anthraquinone; a cellulose acetate fabric is printed with a paste containing 1, hydroxy-4. amino-anthraquinone, the condensation product of formaldehyde and the mono ethyl ether of ethylene glycol (or propylene glycol), thickener and water; a cellulose acetate fabric dyed blue with Dianisidine Blue is printed with a paste containing benzene-azo-1, phenyl-3, methyl-5, pyrazolone, the condensation product of a -hydroxy isobutyric acid and formaldehyde, sodium (or zinc) formaldehyde sulphoxylate thickener and water.  Specifications 219,349, 224,681, 227,183, 237,943, 239,470, 253,978, 263,260, 273,693, 283,081, 283,253, 299,349, 300,929, 305,560, 306,981, 310,827, and 311,433, [all in Class 15 (ii)], also are referred to.  The Specification as open to inspection under Sect. 91 includes generally processes for facilitating the absorption of substances in artificial filaments, yarns, fabrics, films, and other materials comprising cellulose derivatives, by means of ethers obtainable by the condensation of aldehydes or ketones with di- or polyhydric alcohols, or partial ethers or esters thereof, or aliphatic hydroxy carboxylic acids.  The ketones specified are acetone, methyl ethyl ketone, and cyclohexanone.  This subject-matter does not appear in the Specification as accepted.