Multilayered heat-sealable plastic films
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United States of America Patent
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Jul 30, 1996
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Feb 14, 1995
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Sep 19, 1992
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Abstract
The invention relates to a recycable, heat-sealable plastic film for hermetically sealing plastic containers, comprising at least two layers which mutually adhere, (i) a support layer comprised of an impact resistant polystyrene resin and (ii) a sealing layer consisting essentially of: a) 20-100 weight % of a copolymer P consisting essentially of: (p1) 20-90 weight % methyl methacrylate and/or ethyl methacrylate; (p2) 10-80 weight % of at least one monomer of formula I ##STR1## where R.sub.1 represents an C.sub.3-24 alkyl group; and (p3) 0-10 weight %, preferably 1-8 weight %, of a monomer which is copolymerizable with and different from the monomers (p1) and (p2); and (b) 0-80 weight % of a block copolymer containing styrene blocks.
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