Patent ID: 6500563
Filing Date: 2002-12-31
Classification: B32B,C08F,C08J,C08L,Y10S,Y10T

Abstract:
A soft, set-resistant film comprising a blend of polyolefins, said blend comprising:a) first polymer component present in said film in the range of from 75-98 weight percent, based on the total weight of said polyolefins; wherein said first polymer component has a melting point as determined by differential scanning calorimetry (DSC) in the range of from 25-70Â° C.; wherein said first polymer component has a heat of fusion less than 25 J/g; wherein said first polymer component is a propylene-ethylene polymer having said propylene present in said first polymer component at 80 weight percent or greater, having said ethylene present at 20 weight percent or less, and b) a second polymer component present in said film in the range of from 2-25 weight percent based on the total polyolefins in said film; wherein said second polymer component is a stereoregular isotactic polypropylene; wherein said second polymer component has a melting point as determined by DSC greater than 130Â° C., and a heat of fusion greater than 80 J/g; wherein said film exhibits a set equal to or less than that described by the equation: 7+[3/1000]Ã—L2 where L2 is the adjusted load, and wherein said film exhibits load decay that is equal to or less than 15%.