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US 6,146,764 AGranted
Polymer films and process for the preparation thereof
AssigneeNeste Oy
InventorsEsa Suokas, Mika Harkonen
Life of this patent
Estimating the term…
Abstract
The lamellar layer is formed by overlapping plates of the liquid crystalline polymer in the isotropic matrix. The oxygen transmission rate of a 50 .mu.m thick layer of the monolayer structure is typically less than 150 cm.sup.3 /(m.sup.2 .multidot.d.multidot.bar).
Claims17
An extruded compounded polymer film, comprising at least one anisotropic liquid crystalline polymer;
- at least one isotropic polymer;
- and a compatibilizer that facilitates interfacial adhesion between the anisotropic and the isotropic polymers, said isotropic polymer forming a polymer matrix of the film and said anisotropic liquid crystalline polymer being essentially located in at least one lamellar layer embedded in the polymer matrix and substantially extending over a length and width of the film, the film having an oxygen transmission rate that is less than about 150 cm.sup.3 /(m.sup.2 .multidot.d.multidot.bar), determined according to ASTMD 3985 - 81, and a thickness of 10 to 100 .mu.m.
A process for preparing a polymer film, comprising the steps of:
- blending an isotropic polymer and an anisotropic liquid crystal polymer to provide a polymer blend comprising about 60 to about 95 parts by volume of a polyolefin, about 5 to 40 parts by volume of the anisotropic liquid crystal polymer, and a compatibilizer;
- melt processing said polymer blend at a viscosity ratio value between the anisotropic polymer and the isotropic polymer [.lambda.=.eta..sub.anisotropic polymer /.eta..sub.isotropic polymer ] in a range of about 0.001 to 0.5 in order to produce a compounded polymer compound;
- and
- extruding said compound polymer into said polymer film in which the isotropic polymer forms a polymer matrix of the film and the anisotropic liquid crystalline polymer is essentially located in at least one lamellar layer embedded in the polymer matrix and extends over a length and width of the film so as to form a film having a thickness of 10 to 100 .mu.m, the film having an oxygen transmission rate that is less than about 150 cm.sup.3 /(m.sup.2 .multidot.d.multidot.bar), determined according to ASTMD 3985-81.
1 more element
A laminate, comprising:
- a substrate;
- and
- at least one polymer layer coated on a surface of said substrate so that said polymer layer forms a barrier to transport of oxygen and water vapor through the laminate, the polymer layer comprising a compounded polymer film formed of at least one anisotropic liquid crystalline polymer, at least one isotropic polymer, and a compatibilizer that facilitates interfacial adhesion between the anisotropic and the isotropic polymers, said isotropic polymer forming a polymer matrix of the film and said anisotropic liquid crystalline polymer being essentially located in at least one lamellar layer embedded in the polymer matrix and substantially extending over a length and width of the film, the film having an oxygen transmission rate that is less than about 150 cm.sup.3 /(m.sup.2 .multidot.d.multidot.bar), determined according to ASTM D 3985-81, and a thickness of 10 to 100 .mu.m.
A method for manufacturing a container for foodstuff and chemicals, comprising the steps of forming a container from a laminate comprising:
- a paper board substrate;
- and
- at least one polymer layer coated on a surface of said substrate so that said polymer layer acts as a barrier to transport of oxygen and water vapor through the laminate, the polymer layer comprising a compounded polymer film having a thickness of 10 to 100 .mu.m formed of at least one anisotropic liquid crystalline polymer at least one isotropic polymer, and a compatibilizer that facilitates interfacial adhesion between the anisotropic and the isotropic polymers, said isotropic polymer forming a polymer matrix of the film and said anisotropic liquid crystalline polymer being essentially located in at least one lamellar layer embedded in the polymer matrix and substantially extending over a length and width of the film, the film having an oxygen transmission rate that is less than about 150 cm.sup.3 /(m.sup.2 .multidot.d.multidot.bar), determined according to ASTMD 3985-81.
Dependencies are inferred from the claim text.