Patent ID: 7863479

Claim:
An alkyl ether sulfate salt of the formula I ROâ€”(CH 2 â€”CHR 1 O) y â€”(CH 2 CH 2 O) z SO 3 âˆ’ M + (I), wherein R is an i-C 13 group, R 1 is methyl, M + is a cation, selected from the group consisting of alkali metals, NH 4 + and HNR 2 3 + , where R 2 is selected from the group consisting of unbranched or branched alkyl radicals, CH 2 CH 2 OH and CH 2 CH(OH)CH 3 , y has a mean value of 1-2, z has a mean value of 1-4, for which the quotient A of the critical micelle concentration cmc A = c â¢ â¢ m â¢ â¢ c â¡ ( RO - ( CH 2 â¢ CH 2 â¢ O ) z â¢ SO 3 - â¢ M + ) c â¢ â¢ m â¢ â¢ c ( RO - ( CH 2 - CHR 1 â¢ O ) y - ( CH 2 â¢ CH 2 â¢ O ) z â¢ SO 3 - â¢ M + ) â¢ â¢ is > 1.