Improvements relating to the production of pattern effects on fabrics


264,559. Tootal, Broadhurst, Lee Co., Ltd., and Foulds, R. P. Oct. 9, 1925. Inkless printing by chemical reaction.-Pattern effects are produced on cotton or artificial silk by treating selected areas with a concentrated solution of antimony or bismuth trichloride and thereafter treating such areas with water to precipitate antimony or bismuth oxide in the fabric. The chloride can be dissolved in glycerine, lactic acid, or any other suitable medium from which the oxide is not thrown out until the fabric is. treated with water. A thickening agent such as china clay and gum or feculose may be used. To allow a more concentrated solution of chloride to be used a small proportion of hydrochloric acid may be present. Examples are given in which cotton and acetyl cellulose are printed with a solution of antimonv trichloride and feculose in lactic acid, to which a trace of blue dye may be added if the white produced by the chloride is not sufficiently good. The fabrics may be dyed or printed or subjected to the usual finishing processes before or after treatment.




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