Method of producing composite thermoplastic resin film

Claim 1

A method of fabricating a composite thermoplastic resin film, comprising the steps of: providing a first melt of a first thermoplastic resin; providing a second melt of a second thermoplastic resin different from said first resin; continuously feeding said first and second melts simultaneously to an inlet port of a static mixer and allowing them to pass therethrough, so that a mixture comprising a matrix formed of said first resin, and a plurality of substantially continuous, parallel tapes dispersed within said matrix is formed; continuously discharging said mixture from an outlet port of said static mixer; and continuously extruding said mixture discharged from said static mixer as such through a die, thereby obtaining a composite, thermoplastic resin film comprising a matrix in the form of a film formed of the first thermoplastic resin, and a plurality of substantially continuous tapes dispersed within said matrix, with the plane of each of said tapes being substantially parallel with the plane of said film and each tape having a width of at least 200 times the thickness of the matrix so that the composite film has an oxygen permeation rate of 0.12-900 cc/m 2 .day.atm at a temperature of 20° C. and a relative humidity of 65%.

Claim 2

A method of fabricating a composite thermoplastic resin film, comprising the steps of: providing a first melt of a first thermoplastic resin; providing a second melt of a second thermoplastic resin different from said first resin; continuously feeding said first and second melts simultaneously to an inlet port of a static mixer and allowing them to pass therethrough, so that a mixture comprising a matrix formed of said first resin, and a plurality of substantially continuous, parallel tapes dispersed within said matrix is formed; continuously discharging said mixture from an outlet port of said static mixer; and continuously extruding said mixture discharged from said static mixer as such through a die, thereby obtaining a composite, thermoplastic resin film comprising a matrix in the form of a film formed of the first thermoplastic resin, and a plurality of substantially continuous tapes dispersed within said matrix, with the plane of each of said tapes being substantially parallel with the plane of said film and each tape having a width of at least 200 times the thickness of the matrix so that the composite film has an oxygen permeation rate of 0.12-900 cc/m 2 .day.atm at a temperature of 20° C. and a relative humidity of 65%.