Patent GB-1076916-A (GB)
Title: Aqueous dispersions
Inventor: BISSOT THOMAS CHARLES
IPC: C09G1/08
Filed: 1966-04-26
Abstract: Aqueous dispersions comprise 30 to 70 weight per cent of solid particles of average diameter less than 2 microns, said solids comprising 1 to 10 weight per cent of a surface active agent which is a sodium or potassium C10-18 alkyl sulphate, 5 to 40 weight per cent of an ethylene/ vinyl acetate copolymer containing 18 to 32 weight per cent of polymerized vinyl acetate, and 60 to 95 weight per cent of a hydrocarbon wax having a melting point of 120 DEG  to 200 DEG F. The wax may be paraffin or microcrystalline wax.  The surface active agent may be sodium lauryl sulphate, and sodium ions, e.g. in the form of sodium hydroxide, chloride, sulphate or acetate, are preferably added to the aqueous phase, the pH of which may be adjusted to 8 to 10 by adding sulphuric acid.  The dispersions may be used as fabric softeners, lubricants, waterproofing materials for tents, tarpaulins and rainwear, and for coating paper and films.ALSO:Aqueous dispersions comprise 30 to 70 weight per cent of solid particles of average diameter less than 2 microns, said solids comprising 1 to 10 weight per cent of a surface active agent which is a sodium or potassium C10- 18 alkyl sulphate, 5 to 40 weight per cent of an ethylene/vinyl acetate copolymer containing 18 to 32 weight per cent of polymerized vinyl acetate, and 60 to 95 weight per cent of a wax having a melting point of 120 DEG  to 200 DEG  F.  The surface active agent may be sodium lauryl sulphate, and sodium ions, e.g. in the form of sodium hydroxide, chloride, sulphate or acetate, are preferably added to the aqueous phase, the pH of which may be adjusted to 8 to 10 by adding sulphuric acid.  The wax may be a petroleum wax, e.g. paraffin or microcrystalline wax, or a polyethylene wax, carnauba wax or beeswax.  The dispersions may be used as fabric softeners, lubricants, waterproofing materials for tents, tarpaulins and rainwear, and for coating paper and films.  The dispersions may be blended with other ethylene/vinyl acetate copolymer dispersions.ALSO:Substrates such as paper, films and fabrics may be coated with aqueous dispersions comprising 30 to 70 weight per cent of solid particles of average diameter less than 2 microns, said solids comprising 1 to 10 weight per cent of a surface active agent which is a sodium or potassium C10-18 alkyl sulphate, 5 to 40 weight per cent of an ethylene/vinyl acetate copolymer containing 18 to 32 weight per cent of polymerised vinyl acetate, and 60 to 95 weight per cent of a wax having a melting point of 120 to 200 DEG F.  The surface active agent may be sodium lauryl sulphate, and sodium ions, e.g. as sodium hydroxide, chloride, sulphate or acetate may be added to the aqueous phase, the pH of which may be adjusted to 8 to 10 with sulphuric acid.  The wax may be paraffin, microcrystalline, polyethylene, carnauba or bees wax.  In Example II an aqueous dispersion comprising an ethylene/vinyl acetate copolymer, paraffin wax and sodium lauryl sulphate, blended with a further aqueous dispersion of an ethylene/vinyl acetate copolymer, is coated on glassine paper.