| http://www.w3.org/ns/prov#value | - Suitable alkyl sulphonates for use herein include water-soluble salts or acids of the formula RSO3M wherein R is a C6-C20 linear or branched, saturated or unsaturated alkyl group, or a C8-C18 alkyl group, or a C14-C17 alkyl group, and M is H or a cation, e.g., an alkali metal cation or ammonium or substituted ammonium.
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