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Mobil Oil Corporation

Joseph Edward Brew

Jay K Keung

Benoit Ambroise

Karen A Sheppard

Francis Tran The-Dzuy

A heat-sealable multilayer film comprising: (a) an upper heat-sealable layer comprising (I) an ethylene polymer, copolymer, or terpolymer and (ii) a particulate, crosslinked hydrocarbyl-substituted polysiloxane having a mean particle size of from about 0.5 &mgr;m to about 20.0 &mgr;m, as a combined slip agent and antiblocking agent; (b) an intermediate core layer comprising a propylene polymer; and (c) a lower heat-sealable layer consisting essentially of (I) an ethylene polymer, copolymer, or terpolymer, (ii) a particulate, crosslinked hydrocarbyl-substituted polysiloxane having a mean particle size of from about 0.5 &mgr;m to about 20.0 &mgr;m, as a combined slip agent and antiblocking agent; and (iii) from about 0.15 wt% to about 1.5 wt% of a liquid, hydrocarbyl-substituted polysiloxane. The upper heat-sealable sealable layer does not contain a liquid polysiloxane, but may have a coating of liquid polysiloxane transferred from the lower heat-sealable layer.

Multi-layer oriented heat sealable film structure of improved machinability

A polymeric film having improved moisture barrier characteristics and enhanced mechanical properties. The film has a base layer which includes a blend of a high crystallinity polypropylene having an isotactic stereoregularity greater than about 93%, a conventional isotactic polypropylene having an isotactic stereoregularity of from about 90% to about 93%, and up to about 9% by weight of a resin modifier.

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Newark, NY, United States of America

Joseph Edward Brew