Patent GB-959772-A (GB)
Title: Pressurised hair waving compositions
Filed: 1960-09-09
Abstract: A two liquid phase pressurized hair waving composition, adapted for discharge from a container as a foam which collapses to a p  liquid promtly after discharge; comprises an aqueous solution of a keratin-reducing agent such as a water soluble mercaptan containing up to 6 carbon atoms and a functional group, e.g. carboxyl, hydroxyl or ramide and a water-soluble surface-active agent, together with a normally gaseous liquefied propellant such as difluorethane and/or monochloro difluoroethane.  The mercaptan may be thio-glycollic acid or mercapto propionic acid.  The surface-active agent may be an alkyl(C8-C18) sulphate, an alkyl (C8-C18) polyethoxy (1-10 units of-C2H4o-) ether sulphate, an alkyl (C8-C18) aromatic sulphonate, a mono-or di-alkyl (C8-C18) ester of sulphosuccinic acid, a sulphonated or sulphated amide of a higher fatty acid, a sulphuric acid ester of a polyhydric alcohol incompletely esterified with a higher fatty acid, a higher fatty acid ester of a low molecular weight alkylol sulphonic acid in the form of sodium, potassium, ammonium or alkanol ammonium salts, a polyalkeylene glycol ester, ether or thio ether, a condensation product of an alkyl phenol with ethylene oxide or polyethylene oxide-polypropylene oxide condensation product or a sodium, potassium, ammonium or triethenolamine salt of tallow or coconut oil fatty acid.  The pH of the composition may be adjusted to 7-10 by the addition of an alkalising agent of which a substantial part is a base with a dissociative constant less than 10-5, e.g. ammonia, monoethanolamine, diethanolamine, tris(hydroxymethyl)aminomethane and 2-amino-2 methyl-1, 3-propanediol or mixtures thereof, triethanolamine and glycerylamine if desired in admixture with sodium, lithium or potassium hydroxide or tetramethylammonium hydroxide and soluble carbonates and bicarbonates.  The difluoroethane and/or monochlorodifluoroethane may be used in admixture with other propellants, e.g. monochlorodifluoromethane or trifluoromonochloroethane and 1-10% by weight of a vapour pressure depressant, e.g. aromatic and aliphatic carboxylic esters whose molecular weights are between 190 and 600 such as dialkyl phthalates, glutarates, adipates and pimelates in which each alkyl radical contains 2-12 carbon atoms and alkyllaurates, myristates and palmitates in which each alkyl radical contains 3-8 carbon atoms and/or trifluomonochloroethane may be added to ensure that the vapour pressure of the composition in its package is less than 135 psig at 130 DEG F. and to adjust the density of the propellant phase so that it is substantially equal to the density of the aqueous phase.  The composition may also contain a soluble salt of the disulphide of the keratin-reducing agent and a perfume may be packaged in pressure-tight glass bottles coated on the outside with plastic at pressures lower than about 25 psig at 70 DEG F. or in metal cans, e.g. aluminium cans, for higher pressures in which case a corrosion inhibitor, e.g. 0.001-0.1% by weight SiO2 as water soluble sodium silicate may be added to the composition as corrosion inhibitor.  Specification 748,411 also is referred to.