Anionic surfactant compositions effective in aqueous solutions of strongly ionizable salts
AssigneeBASF Wyandotte Corporation
InventorsThomas M. Kaneko, Daniel R. Dutton, Bongsub Kim
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Abstract
Highly stable emulsions of biocides in liquid fertilizer compositions are disclosed which offer unexpected stability thus permitting application of both biocides and liquid fertilizers simultaneously. The improved emulsion stability can be obtained by utilizing higher polyoxyalkylene glycol ethoxylate esters or combinations thereof with certain anionic emulsifiers. Stable aqueous emulsions are also disclosed.
Claims7
A surfactant blend comprising about 50 to 95 percent by weight of at least one polyoxyalkylene glycol ethoxylate ester and about 50 to about 5 percent by weight of at least one other anionic surfactant,
- said ester being the reaction product of a polybasic acid or anhydride with a polyoxyalkylene glycol ethoxylate having the formula
- Y[(A).sub.n --(C.sub.2 H.sub.4 O).sub.m --H].sub.x
- wherein A is an alkylene oxide having 4 carbon atoms and selected from the group consisting of oxybutylene, the residue of tetrahydrofuran, and mixtures thereof;
- Y is an initiator having up to 20 carbon atoms and free of elements other than carbon, hydrogen, oxygen and nitrogen and x is an integer of at least 2, n is an integer such that the molecular weight is about 1000 to about 2500, m is an integer such that the oxyethylene content of the entire compound, mx oxyethylene groups, constitutes about 20 to about 80 percent by weight of the total oxyalkylene content and
- said anionic surfactant is at least one anionic alkylaromatic sulphur- or phosphorus-containing ester surfactant having an HLB of at least 15.
Dependencies are inferred from the claim text.