Patent ID: 6514926
Filing Date: 2003-02-04
Classification: C11D

Abstract:
A modified alkylbenzene sulfonate surfactant mixture comprising:(a) from about 60% to about 95% by weight of a mixture of branched alkylbenzene sulfonates having formula (I): wherein L is an acyclic aliphatic moiety consisting of carbon and hydrogen, said L having two methyl termini and said L having no substituents other than A, R1 and R2; and wherein said mixture of branched alkylbenzene sulfonates contains two or more of said branched alkylbenzene sulfonates differing in molecular weight of the anion of said formula (I) and wherein said mixture of branched alkylbenzene sulfonates has a sum of carbon atoms in R1, L and R2 of from about 9 to about 15; an average aliphatic carbon content of from about 10.0 to about 14.0 carbon atoms; M is a cation or cation mixture having a valence q; a and b are integers selected such that said branched alkylbenzene sulfonates are electroneutral; R1 is C1-C3 alkyl; R2 is selected from H and C1-C3 alkyl; A is a benzene moiety; and (b) from about 5% to about 40% by weight of a mixture of nonbranched alkylbenzene sulfonates having formula (II): wherein a, b, M, A and q are as defined hereinbefore and Y is an unsubstituted linear aliphatic moiety consisting of carbon and hydrogen having two methyl termini, and wherein said Y has a sum of carbon atoms of from about 9 to about 15 and said Y has an average aliphatic carbon content of from about 10.0 to about 14.0; and wherein said modified alkylbenzene sulfonate surfactant mixture has a 2/3-phenyl index of from about 275 to about 10,000.