Patent ID: 6071598
Filing Date: 2000-06-06
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, andthe n-heptane-soluble fraction of the polypropylene is less than 1%, andthe modulus of elasticity of the base ply in the longitudinal direction is greater than 2,400 N/mm.sup.2 and the modulus of elasticity of the base ply in the transverse direction is greater than 4,800 N/mm.sup.2.