C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
117/209, 32/49
C03C 17/28 (2006.01) B05B 15/04 (2006.01) C03C 17/00 (2006.01)
Patent
CA 1152821
IMPROVEMENTS RELATING TO THE TREATMENT OF FLAT GLASS ABSTRACT OF THE DISCLOSURE A method of treating flat glass to reduce its vulnerability to scratching, e.g. during storage and/or transit, wherein a transparent film of a cationic surface active agent is adsorbed on the glass by applying an aqueous solution of the surface active agent to the glass on the production line and drying the glass. The treatment may be effected prior to processing such as toughening, bending or laminating of the glass. The solution may be applied to the glass after it has been washed, near the end of the production line, using for example an anionic surface active agent as detergent. Alternatively, a solution containing both a cationic surface active agent and an anionic surface active agent as detergent may be applied to the glass to wash it, followed by rinsing with water and drying. The cationic surface active agent is preferably one which is positively charged in the aqueous solution e.g. a quaternary ammonium salt such as an alkyl dimethyl benzyl ammonium chloride. A concentration of 0.001% to 2%, pref- erably of the order of 0.02%, of the cationic surface active agent may be used. Apparatus for carrying out the treatment on the production line comprises means for sup- plying a solution of treatment agent to at least one major surface of the glass, a collector for collecting solution flowing from the glass, means for recycling at least a proportion of solution from the collector to the supply means and a reservoir arranged for connection to the supply means for holding fresh treatment solution and supplying it to the supply means.
333131
Meredith & Finlayson
Pilkington Brothers P.l.c.
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