| abstract |
An oil base fluid containing the reaction product of an organic cationic compound and a smectite-type clay, wherein the organic cation has the formula: <IMAGE> where R1 is a beta , gamma -unsaturated alkyl group having less than 7 aliphatic carbon atoms, a hydroxyalkyl group having 2-6 carbon atoms, or mixtures thereof; R2 is an alkyl group having 8-60 carbon atoms; R3 & R4 are individually a beta , gamma -unsaturated alkyl group having less than 7 aliphatic carbon atoms, a hydroxyalkyl group having 2-6 carbon atoms, an alkyl group, an alkyl group having 1-22 carbon atoms or mixtures thereof, and X is phosphorus or nitrogen. |