Patent GB-825551-A (GB)
Title: Improved water-repellent finishes
Inventor: EVANS JOHN GWYNANT
Filed: 1955-02-08
Abstract: Non-porous surfaces are rendered waterrepellent by applying thereto both (1) at least one organosilicon compound which is a hydrolysable organosilane or a product obtainable by hydrolysis thereof, the said organosilane containing an organic group or groups linked to the silicon through carbon-silicon linkage and containing a hydrolysable substituent or substituents directly attached to silicon; and (2) at least one alkanolamine ester of titanic acid.  The organosilicon compound may have one or more alkyl, aryl, aralkyl or alkenyl groups linked to a silicon atom, preferred compounds having phenyl or methyl radicals and hydrogen linked to silicon as in methyl hydrogen polysiloxanes.  Non-porous surfaces are defined as those which offer a substantial or high resistance to the penetration of liquid water, but not necessarily to that of water vapour, and include the surfaces of rubber and synthetic rubber, polyethylene terephthalate, polyamides, acrylate and methacrylate polymers, vinyl polymers and copolymers, polystyrene, polyethylene, phenol-, urea- and melamine-formaldehyde resins, alkyd resins, casein-formaldehyde reaction products, cellulose derivatives such as cellulose acetate and nitrocellulose, regenerated cellulose, oxidized or polymerized linseed oil, metals and alloys, ceramics, glass, masonry and other building materials, wood and cork.  After treatment the material is preferably heated suitably to 100 DEG  to 200 DEG  C., e.g. by hot-air chambers, ovens, heated surfaces, infra-red radiation or highfrequency heating, but alternatively may be exposed to visible or ultra-violet light or to both.  In examples, aqueous emulsions prepared by emulsifying a white spirit solution of a mixture of trimethylsiloxy end-blocked methyl hydrogen polysiloxane and trimethylsiloxy end-blocked dimethyl polysiloxane have added thereto triethanolamine titanate, which dissolves in the aqueous phase, or diethanolamine titanate in the form of an aqueous emulsion, and glass slides, sheet rubber, aluminium, cellulose acetate, asbestos board or polyethylene terephthalate film, are dipped therein and subsequently heated; polyethylene film is dipped into a solution of the silicone and triethanolamine in benzene, and allowed to drain and dry at room temprature.  Specifications 680,265, 708,821, [both in Group VIII], 750,805, 758,987 and 809,822, [both in Group VIII], are referred to.ALSO:Non-porous surfaces are rendered water-repellent by applying thereto both (1) at least one organosilicon compound which is a hydrolysable organosilane or a product obtainable by hydrolysis thereof; and (2) at least one alkanolamine ester of titanic acid. The organosilicon compound may have one or more alkyl, aryl, aralkyl or alkenyl groups linked to a silicon atom, preferred compounds having phenyl or methyl radicals and hydrogen linked to silicon, as in methyl hydrogen polysiloxanes.  After treatment the material is preferably heated suitably to 100 DEG  C. to 200 DEG  C., e.g. by hot air chambers, ovens, heated surfaces, infra-red radiation or high-frequency heating, but alternatively may be exposed to visible or ultraviolet light or to both.  In examples, aqueous emulsions prepared by emulsifying a white spirit solution of a mixture of trimethylsiloxy end-blocked methyl hydrogen polysiloxane and trimethylsiloxy end-blocked dimethyl polysiloxane have added thereto triethanolamine titanate, which dissolves in the aqueous phase, or diethanolamine titanate in the form of an aqueous emulsion, and glass slides, sheet rubber, aluminium, cellulose acetate, asbestos board or polyethylene terephthalate film, are dipped therein and subsequently heated; and polyethylene film is dipped into a solution of the silicone and triethanolamine titanate in benzene, and allowed to drain and dry at room temperature.  Specifications 680,265, 708,821, [Group VIII], 750,805, 758,987 and 809,822 also are referred to.