Patent ID: 6086982
Filing Date: 2000-07-11
Classification: B32B,C08J,C08L,Y10S,Y10T

Abstract:
A biaxially oriented polypropylene single ply film whereinthe mean isotactic block length of the polypropylene molecule between two structural chain defects is, as a statistical average, greater than 40,the n-heptane-insoluble fraction of the polypropylene has a chain isotactic index of at least 95%, measured by means of .sup.13 C-NMR spectroscopy,the ratio of the weight average M.sub.w to the number average M.sub.n of the molecular weight distribution is less than 4,the n-heptane-soluble fraction of the polypropylene is less than 1%, andthe shrinkage of the film in the longitudinal direction and in the transverse direction is less than 5%.