American Can Company

William G Ticknor

Arnold R Rein

A multilayer film is prepared by coextruding nylon with a chemically modified polyolefin which has functional groups added to the basic polymer to provide strong adhesion to the nylon after coextrusion. The multiple layer film combines the strength and protection properties of the nylon with desired properties in the modified polyolefin. Multiple layer films may be produced by coextruding nylon layers with multiple layers of the modified polyolefin, and with additional layers of nonmodified polyolefins and other polymers. Suitable commercially available modified polyolefins for use in the multilayer film include Plexar-1 and Plexar-3 described in U.S. patent application Ser. No. 616,035, and Plexar-2 described in U.S. patent application Ser. No. 616,374, both filed in September, 1975, now abandoned, and respective continuation-in-parts thereof Ser. No. 808,080, now U.S. Pat. No. 4,087,588, and Ser. No. 808,079, now U.S. Pat. No. 4,087,587.

Coextruded multilayer film

A resin blend for producing a peelable heat seal, which does not produce 'angel hair' upon separation, includes polybutylene and a copolymer of ethylene with, for example, vinylacetate or methyl acrylate. Typical substrates are high density polyethylene and nylon.

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Appleton, WI, United States of America

William G Ticknor