GB425215A - Improvements in and relating to the treatment of paper and cloth - Google Patents

Abstract

425,215. Treating paper or cloth to render it translucent. HALDEN & CO., Ltd., J., and HOLDEN, J., Rowsley Works, Reddish, near Stockport. June 6, 1933, No. 16167. [Classes 96 and 140] Paper or cloth is subjected to the action of a medium to render it translucent, and a wetting- out agent innocuous to the fabric or medium for effecting the translucency the wetting-out agent being applied before, with or after the translucing medium. Suitable wetting agents are the substance sold under the Registered Trade Mark " Lanette" wax, sulphonated loral, unsaturated fatty alcohols, hydroxy unsaturated alcohols, aryl derivatives of aliphatic alcohols, alkyl ethers of polyhydric alcohols such as glycol or glycerol containing a free - OH group, sulphuric esters of fatty alcohols as inorganic or organic salts, or true sulphonic acids. The translucing agent may be oil or wax, and may be employed with colloids such as glue, gelatine, casein, dextrine or starch. In an example, paper, preferably well sized is passed through a bath of molten wax, e.g. paraffin wax of high melting point, the excess wax being removed by doctors. One or both sides of the cooled paper is or are then coated with 0À5 per cent of sulphonated loral and 2 per cent of Lanette wax dissolved in ethyl alcohol. In another example, the paper is treated with an aqueous dispersion containing 10 per cent wax, 5 per cent casein, 1 per cent of sulphonated loral and 2 per cent of Lanette wax. In another example a mixture of paraffin wax and Lanette wax is applied to paper if desired in solution in petroleum spirit. Again a length of cloth may be treated with a starch solution containing coco-nut oil or paraffin wax together with 5 per cent of sulphonated loral. Other examples are given in the Specification. If desired, the material may be treated with a colloid and wetting agent applied to one side, the translucing medium being applied to the other. Materials treated according to the invention " take " aqueous solutions such as ink or a sensitive coating without further treatment.