Alkoxylated alkylamine quaternary surfactants for glyphosate

A stable aqueous liquid herbicidal concentrate comprising an ammonium salt of glyphosate and containing at least about 120 g/L glyphosate a.e., ammonium ion in a molar ratio to glyphosate between about 0.75 and about 2.5, and at least two alkoxylated quaternary alkylammonium surfactants corresponding to the formula:

• RR′N(+)AB
• where R is a straight chain or branched chain, saturated or unsaturated alkyl group having from 8 to 22 carbon atoms, R′ is a straight or branched chain, saturated or unsaturated alkyl group having from 1 to 4 carbon atoms, A is (R2O)p(R3O)q(R4O)zR8 and B is (R5O)p′(R6O)q′(R7O)z′R9 where each of R2, R3, R4, R5, R6, and R7 is independently selected from the group consisting of ethylene and isopropylene, each of R8 and R9 is independently selected from the group consisting of hydrogen, methyl, and ethyl, and each of p, q, p′, q′, z and z′ is independently an integer between 0 and 30 and the sum of (p+p′+q+q′+z+z′) is at least about 2, the weight ratio of the total of alkoxylated quaternary alkylammonium surfactant(s) to ammonium glyphosate, a.e., in said concentrate being between about 0.1:1 and about 0.2:1, and the average sum of (p+p′+q+q′+z+z′) for one of said at least two surfactants being between about 2 and about 5, and the average sum of (p+p′+q+q′+z+z′) for another of said at least two surfactants being between about 5 and about 15.