Patent ID: 6022619
Filing Date: 2000-02-08
Classification: C01G,C01P,C09C,Y10T

Abstract:
A method of making a colored textile fabric composite comprising the steps of:(a) contacting a textile fabric with an aqueous solution of a ferrous or ferric salt at a pH of from about 2.5 to about 4.5 wherein said aqueous solution optionally comprises (i) a compound which produces ammonia by hydrolysis in aqueous solution, (ii) a buffering and pH controlling system, and (iii) a dispersing agent;(b) heating the solution in step (a) to a temperature between about 50.degree. and 100.degree. C. while in contact with the textile fabric; and(c) hydrolyzing and oxidizing the ferrous ion, or hydrolyzing the ferric ion, to form an iron (III) oxide and nucleating the iron (III) oxide in situ at the surface of the textile fabric, wherein said iron (III) oxide is present in the solution as particles being sub-colloidal in size, thereby forming a coherent iron (III) oxide coating on the textile fabric surface;wherein the resultant rate of adsorption of the iron (III) oxide particles onto the textile fabric surface is greater than the resultant rate of formation of the iron (III) oxide from the initial ferrous or ferric salt;wherein said coating of iron (III) oxide is selected from the group consisting of goethite, hematite, and any mixture thereof.