Patent ID: 8466306

Claim:
A composition comprising a class of sulfonated triorganophosphine compounds represented by the following formula: wherein R 1 and R 2 each individually represent a monovalent hydrocarbyl or substituted hydrocarbyl radical selected from alkyl, aralkyl, and alicyclic radicals; wherein R 3 represents a divalent or polyvalent arylalkylene radical, wherein an alkyl moiety is bonded to the phosphorus atom and an aryl moiety is bonded to the alkyl moiety and is substituted with one or more sulfonate substituents; and wherein any aryl group on R 1 and R 2 and the aryl moiety on R 3 are each limited to only one monocyclic aryl ring; and wherein M comprises a monovalent cation, and n is an integer from 1 to 3 representing a total number of sulfonate substituents; and where in each of R 1 and R 2 , the carbon atom attached to the phosphorus atom or a carbon atom bonded to the carbon atom attached to the phosphorus atom is additionally bonded to at least 2 other carbon atoms, and in R 3 the carbon atom attached to the phosphorus atom is bonded to at least 2 carbon atoms.