Air Products and Chemicals, Inc.

Rajendra K Mehta

Bernard D Bauman

Patricia E Burdick

Mark Alan Williams

The present invention is an improved plastic container having both improved thermal resistance and improved aroma and flavor barrier properties. The container comprises a polyethylene inner layer having a thickness in the range of 0.5 to 10.0 mil, and a coextruded polypropylene outer layer having a thickness such that the ratio of polypropylene to polylethylene is at least 2:1, and wherein the surface of the polyethylene layer has been treated with a reactive source of fluorine.

Hot-fillable plastic containers

Ground polymeric elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at leasts one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO.sub.2 with or without added oxygen.

Polymeric materials having controlled physical properties

Ground polymer elastomer or other polymeric plastic, particularly from recovered scrap, is surface modified by treatment with a gaseous mixture containing a minor amount of fluorine and a larger amount of at least one reactive gas in an inert gaseous carrier. By the treatment the ground material is made more compatible for admixture with polyfunctional polymer-forming liquids, thereby obtaining novel composites of controlled physical properties. The other reactive gas is preferably oxygen or one of the gases from the group consisting of: chlorine and SO.sub.2 with or without added oxygen.

Polymeric materials having controlled physical properties and processes

The present invention is a method for improving the barrier properties of thermoplastic substrates. A surface of the thermoplastic substrate is contacted with a reactive gas stream having an F.sub.2 concentration greater than or equivalent to 0.0001 atm. partial pressure of F.sub.2 per atm. total pressure and sufficient oxygen such that the F.sub.2 /O.sub.2 ratio is less than or equal to about 100, with the remainder being additional reactive and/or non-reactive components. A barrier coating material is applied to the treated surface of the substrate and subsequently undergoes a curing step to form the final product.

Method for increasing barrier properties of thermoplastic substrates

A method is provided for determining the impermeability of a polymeric article to a fluid by the steps of:

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Allentown, PA, United States of America

Rajendra K Mehta