Heat sealable plastic film

Abstract

This invention relates to heat-sealable plastic films PF with at least two-phased structure in the thickness range up to 400 .mu.m that are suitable for tightly sealing plastic comprising a) a high molecular weight or crosslinked polymer P with a molecular weight Mw greater than 50,000 and a glass transition temperature Tg below 10.degree. C.; and b) a copolymer CP with a glass transition temperature Tg above 20.degree. C. made up of .alpha.) 0-85 wt. % methyl methacrylate .beta.) 0-100 wt. ethyl methacrylate .gamma.) 0-100 wt. cyclohexyl methacrylate, cyclopentyl methacrylate, or a mixture thereof; .delta.) 0-20 wt. % of a monomer copolymerizable with the monomers .alpha.)-.gamma.), and different from them, provided that the sum of the components .alpha.) to .delta.) is 100 wt. % wherein at least 2 wt. % of copolymer CP is covalently bound to polymer P.

Dependencies are inferred from the claim text.