Patent ID: 6187449
Filing Date: 2001-02-13
Classification: A22C,B29D,B29K,B32B,C08J,C08L,Y10T

Abstract:
A food packaging stretch film free from polyvinyl chloride and having a storage modulus (E') of from 5.0.times.10.sup.8 to 5.0.times.10.sup.9 dyn/cm.sup.2 and a loss tangent (tan .delta.) of from 0.2 to 0.8, as measured by dynamic viscoelasticity measurement at a frequency of 10 Hz at a temperature of 200.degree. C., which film has at least one layer containing (A) from 20 to 80 wt % of a resin which is a copolymer of a vinyl aromatic monomer with a conjugated diene, or said copolymer which has been hydrogenated, and which resin has a glass transition temperature of at least -20.degree. C. and (B) from 80 to 20 wt % of a propylene-containing polymer.