Aerosol foams

Claim 1

An aerosol shaving foam dispenser containing an aqueous soap-free surfactant concentrate, and emulsified or readily emulsifiable therewith, a gaseous aerosol propellant in liquid phase, said concentrate consisting essentially of water and; (i) from 1-15% by weight of the concentrate of a nitrogen-containing surfactant selected from the group consisting of: ##STR5## where R is a straight chain C 12 -C 18 alkyl group; Y is H or (CH 2 CH 2 O) m H, where m is an integer of from 1-30; n is an integer of from 1-30; and the total of n + m is from 1-40; and with the proviso that, when Y is H, then n is greater than 10; ##STR6## where R' is a straight chain C 11 -C 17 alkyl group; R" is C 1 -C 3 alkyl; and Z is CH 2 or CH 2 CONH(CH 2 ) x --, where x is an integer of from 2-5; and ##STR7## where A is a straight chain C 12 -C 18 alkyl group, X is an anion and B, C, and D represent one of the following combinations: (i) B, C and D are each separate C 1 -C 3 alkyl groups; (ii) B and C are each (CH 2 CH 2 O) y , where y is an integer with B and C together providing a total of 2-12 ethoxy units and D is C 1 -C 3 alkyl; and (iii) B, C and D together with the nitrogen atom to which they are attached jointly represent a pyridine nucleus; or a water-dispersible lauric polyamide (2:1), having a melting point in the range 53°-57° C., an acid number not greater than 10 and an alkali number in the range 136-156; or a tris-(polyoxyethylene) alkyl ammonium phosphate of the formula ##STR8## where R is a straight chain C 12 -C 18 alkyl group and x, y and z are integers of from 1-20; (ii) from 0.5-6% by weight based on the concentrate, of a long chain fatty alcohol containing from 12-18 carbon atoms; and (iii) from 1-15% by weight based on the concentrate of (a) a water-soluble or insoluble synthetic nonionic surfactant having an HLB value of from 3-40 and containing, as its hydrophobic part a straight chain alkyl group of from 12-18 carbon atoms or alkyl-substituted benzene or napphthalene group containing a straight chain alkyl substituent of from 5-12 carbon atoms, (b) a long chain alkyl sulphosuccinate containing from 12-18 carbon atoms in the alkyl group or a benzene or napththalene sulphosuccinate containing a straight chain alkyl substituent of from 5-12 carbon atoms on the aromatic nucleus, or (c) an N-coconut-acyl-N-methyl taurate, the weight ratio of components (i) and (iii) together to component (ii) being from 0.5:1 to 12:1 and the three components of the concentrate being such that the HLB value is from 8-18.