Grease Resistance of Corn Zein Coated Paper

The grease resistance of corn zein coated paper was measured as related to coating level, plasticizer addition and time. Overall grease resistance ws normalized by time and expressed as percent area stained/hr (%AS. hr ‐1 ). For a 2.2 kg coating ream ‐1 of paper, %AS hr ‐1 was greater than both unplasticized and plasticized 4.4 and 6.6 kg ream ‐1 coating levels (p < 0.001). There was no difference in %AS hr ‐1 among 4.4 and 6.6 kg ream ‐1 zein coated and commercial polyethylene laminated paper (p:ME0.098). Plasticizer increased (p < 0.001) and creasing had no effect (p=0.71) on %AS hr ‐1 . Electron microscopy showed discontinuities in zein coating at the 2.2 kg ream ‐1 level. The 4.4 and 6.6 kg ‐1 ream ‐1 levels showed uniform coatings.