AbstractMixed monounsaturated amides (MMA) of fatty acids from meadowfoam (Limnanthes alba) were effective slip and antiblocking agents for polyethylene films. MMA may compete with extant amides as additives for manufacture of PE films if their selling price is competitive. The MMA (79%cis‐5‐eicosenoic acid amides, 17%cis‐5‐, andcis‐13‐docosenoic acid amides, and 1%cis‐5,cis‐13‐docosadienoic acid amide) required>500 ppm but<1000 ppm dosage to achieve high slip (coefficient of friction<0.2) within 10 minutes of film blowing. For comparison, erucamide required<250 ppm, oleamide required1000 ppm to give high slip levels within 10 min. Maximum antiblocking effectiveness of MMA, which developed at 1000 ppm, was equivalent to stearamide at 1000 ppm. © 1993 Joh