Process for the production of record material

Details Process for the production of record material Process for the production of record material

B - Operations, Transporting

41

M

42/10

B41M 5/124 (2006.01) B41M 5/155 (2006.01) C01B 33/26 (2006.01)

Patent

CA 2032286

43 Abstract Process For The Production Of Record Material A colour developing material is produced by: a) gradually adding a metal silicate solution to a solution of an aluminium salt which is initially at a pH below 4 until the pH of the resulting mixture is approximately 4, thereby to induce some precipitation and to form a sol; b) gradually adding alkali to said sol to raise the pH to approximately 7, thereby to induce further precipitation and gel the sol or further gel the sol, said gelled sol being a hydrated silica/hydrated alumina composite: c) separating the gel from the aqueous medium and washing the resulting product to remove dissolved salts; and d) drying the washed product and reducing it in particle size. This colour developing material is then formulated into a coating composition, applied to a paper base and dried to produce a colour developing record material as used in pressure-sensitive (carbonless) copying paper sets.

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