USH1727H - Heat sealable packaging materials having a peelable, easy-opening feature - Google Patents

Heat sealable packaging materials having a peelable, easy-opening feature Download PDF

Info

Publication number
USH1727H
USH1727H US08/682,413 US68241396A USH1727H US H1727 H USH1727 H US H1727H US 68241396 A US68241396 A US 68241396A US H1727 H USH1727 H US H1727H
Authority
US
United States
Prior art keywords
layer
film
heat
peelable
easy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US08/682,413
Inventor
Gregory K. Jones
Mary E. Shepard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pechiney Plastic Packaging Inc
Original Assignee
American National Can Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American National Can Co filed Critical American National Can Co
Priority to US08/682,413 priority Critical patent/USH1727H/en
Assigned to AMERICAN NATIONAL CAN COMPANY reassignment AMERICAN NATIONAL CAN COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JONES, GREGORY K., SHEPARD, MARY E.
Application granted granted Critical
Publication of USH1727H publication Critical patent/USH1727H/en
Assigned to PECHINEY PLASTIC PACKAGINC, INC. reassignment PECHINEY PLASTIC PACKAGINC, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN NATIONAL CAN COMPANY
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene

Definitions

  • the present invention is in the field of multilayer polymeric films and heat sealable packages made therefrom, which may be easily opened by the application of force to the seal.
  • the multilayer thermoplastic films are widely used in the packaging industry to form packages.
  • Multilayer films are formed by methods of coextrusion, or by lamination.
  • films are sealed to form packages by way of heat sealing.
  • Heat sealing of multilayer polymeric films means sealed or bonded by heat however obtained, for example by induction, or by magnetic, ultrasonic, radio frequency, light, laser or other energy sources which cause the polymeric materials to bond, fuse, or otherwise seal.
  • Heat sealable packages made from polymeric films are well known in the art for packaging a variety of articles, including food products.
  • a peelable seal as between two films, or between a film and a substrate is produced by any of several methods common in the art, including by heat sealing, impulse sealing, or by applications as a hot melt. Regardless of the method used, the peelable seal has a mechanical resistance to opening or peeling which results in a tight seal around a packaged item during storage until a user wants access to the packaged item.
  • the mechanical resistance of the seal is low enough, however, to permit "easy-opening", such as by the force associated with pulling apart by hand.
  • peelable seal mechanism is delamination-type peelable seals, in which the film peels or "delaminates" at the interface between two layers, and the two layers separate from each other.
  • This invention is for a novel multilayer polymeric film for use in peelably opening packages.
  • the film has improved consistency and is more easily processed than prior art films.
  • the film has advantages over the prior art films in that the costs associated with the manufacture and production of the film are lower.
  • the multilayer film of the invention has a first interior layer which comprises a blend of a polypropylene, including both homopolymers and copolymers of polypropylene, and a primary resin.
  • the primary resin may comprise one or more of the following components: an ionomer or another acid copolymer, ethylene vinyl acetate (EVA), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE).
  • the film also comprises a second outer layer, which is a heat sealant layer, which is disposed in contact with the first interior layer.
  • the heat sealant layer comprises a blend of polybutylene and a copolymer which may be any of the various copolymers commonly used in heat sealant layers, such as, for example, LDPE, LLDPE, EVA, EAA, and an ionomer.
  • the heat sealant layer is disposed near or immediately adjacent the first interior layer.
  • the heat sealant layer of the film may be heat sealed to itself or to a similar sealant layer of a second film.
  • the film itself may be laminated to additional components, such as to a substrate.
  • the sealant layer separates by delamination from the first polypropylene-containing layer, resulting in a peelably opening or easy-opening package.
  • FIG. 1 shows a cross-section of films of the invention.
  • FIG. 2 shows a cross-section of an alternative embodiment of the films of the invention.
  • FIG. 1 shows a cross-section of the first embodiment of the films of the invention.
  • Layer 10 is a first interior layer which is a blend of polypropylene and a primary resin, comprising an ionomer, an acid copolymer, ethylene vinyl acetate, low density polyethylene and linear low density polyethylene.
  • the polypropylene layer includes both homopolymers and copolymers of polypropylene.
  • Layer 11 is a second outer layer, which is a heat sealant layer. Layer 11 is disposed in surface-to-surface contact with layer 10.
  • the heat sealant layer comprises polybutylene and a copolymer which may be any of the various copolymers commonly used in heat sealant layer. These include but are not limited to low density polyethylene (“LDPE”), linear low density polyethylene (“LLDPE”), high density polyethylene (“HDPE”), ethylene vinyl acetate (“EVA”), ethylene methacrylate (“EMA”), ethylene acrylic acid (“EAA”), and ionomers, as well as copolymers containing these polymers.
  • Heat seal layers common in the art also include blends, in varying percentages, of the above-referenced polymers.
  • the sealant layer 11 separates from the first layer 10 at point 12.
  • FIG. 2 depicts a second embodiment of the films of the invention.
  • layer 20 is the first interior layer and layer 21 is the outer sealant layer.
  • the first interior layer 20 and outer sealant layer 21 are disposed in surface-to-surface contact.
  • the substrate is represented by layer 22.
  • Layer 20 and layer 22 are adhered through any of several methods common in the art, such as by lamination.
  • the sealant layer 21 separates from the first layer 20 at point 23.
  • the substrate layer 22 may be an additional film, to which the film of the invention is bonded by any of several methods common in the art, including by way of an adhesive or through lamination.
  • the substrate 22 may be comprised of a material such as paper, cardboard, metal or any of several other materials.

Landscapes

  • Laminated Bodies (AREA)

Abstract

A heat sealable, co-extruded multi-layer packaging film with a peelable, easy-opening feature, comprising a first layer which comprises a blend of polypropylene and a primary resin. The primary resin may comprise ionomers or other acid copolymers, ethylene vinyl acetate, low density polyethylene, or linear low density polyethylene. The first layer is disposed in contact with a second outer layer, which is a heat sealant layer, comprising polybutylene. The heat sealant layer separates from said first layer when force is applied to the heat seal. The film may be laminated to additional components, and may be heat sealed to itself or to a similar film to form a package.

Description

BACKGROUND OF THE INVENTION
The present invention is in the field of multilayer polymeric films and heat sealable packages made therefrom, which may be easily opened by the application of force to the seal.
The multilayer thermoplastic films are widely used in the packaging industry to form packages. Multilayer films are formed by methods of coextrusion, or by lamination.
Typically, films are sealed to form packages by way of heat sealing. Heat sealing of multilayer polymeric films means sealed or bonded by heat however obtained, for example by induction, or by magnetic, ultrasonic, radio frequency, light, laser or other energy sources which cause the polymeric materials to bond, fuse, or otherwise seal. Heat sealable packages made from polymeric films are well known in the art for packaging a variety of articles, including food products.
Packages made from multilayer polymeric films having peelable or easy-opening features are also common in the art. A peelable seal as between two films, or between a film and a substrate, is produced by any of several methods common in the art, including by heat sealing, impulse sealing, or by applications as a hot melt. Regardless of the method used, the peelable seal has a mechanical resistance to opening or peeling which results in a tight seal around a packaged item during storage until a user wants access to the packaged item. The mechanical resistance of the seal is low enough, however, to permit "easy-opening", such as by the force associated with pulling apart by hand.
One type of peelable seal mechanism is delamination-type peelable seals, in which the film peels or "delaminates" at the interface between two layers, and the two layers separate from each other.
a prior art, heat sealable film capable of being formed into a package having an easy-opening feature is disclosed in U.S. Pat. No. 4,944,409, to Busche. The package disclosed in Busche is adapted to be heat sealed closed and peelably reopened at the heat seal. The package of Busche is made from a three layer film, consisting of an outer layer, an inner sealant layer, and a tie layer disposed between the outer and inner layers. The composition of the layers is selected so that the tie layer forms a permanent bond with the layer of the interface for which a permanent bond is desired, and forms a peelable bond at the other interface for which a peelable bond is desired.
It is an object of the invention to provide a multilayer film, and packages made therefrom, having a novel, improved delamination type peelable heat seal mechanism.
SUMMARY OF THE INVENTION
This invention is for a novel multilayer polymeric film for use in peelably opening packages. The film has improved consistency and is more easily processed than prior art films. In addition, the film has advantages over the prior art films in that the costs associated with the manufacture and production of the film are lower.
The multilayer film of the invention has a first interior layer which comprises a blend of a polypropylene, including both homopolymers and copolymers of polypropylene, and a primary resin. The primary resin may comprise one or more of the following components: an ionomer or another acid copolymer, ethylene vinyl acetate (EVA), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE).
The film also comprises a second outer layer, which is a heat sealant layer, which is disposed in contact with the first interior layer. The heat sealant layer comprises a blend of polybutylene and a copolymer which may be any of the various copolymers commonly used in heat sealant layers, such as, for example, LDPE, LLDPE, EVA, EAA, and an ionomer. The heat sealant layer is disposed near or immediately adjacent the first interior layer.
The heat sealant layer of the film may be heat sealed to itself or to a similar sealant layer of a second film. The film itself may be laminated to additional components, such as to a substrate.
When force is applied to the heat seal, such as the force associated with pulling apart by hand, the sealant layer separates by delamination from the first polypropylene-containing layer, resulting in a peelably opening or easy-opening package.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross-section of films of the invention.
FIG. 2 shows a cross-section of an alternative embodiment of the films of the invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a cross-section of the first embodiment of the films of the invention. Layer 10 is a first interior layer which is a blend of polypropylene and a primary resin, comprising an ionomer, an acid copolymer, ethylene vinyl acetate, low density polyethylene and linear low density polyethylene. The polypropylene layer includes both homopolymers and copolymers of polypropylene.
Layer 11 is a second outer layer, which is a heat sealant layer. Layer 11 is disposed in surface-to-surface contact with layer 10. The heat sealant layer comprises polybutylene and a copolymer which may be any of the various copolymers commonly used in heat sealant layer. These include but are not limited to low density polyethylene ("LDPE"), linear low density polyethylene ("LLDPE"), high density polyethylene ("HDPE"), ethylene vinyl acetate ("EVA"), ethylene methacrylate ("EMA"), ethylene acrylic acid ("EAA"), and ionomers, as well as copolymers containing these polymers. Heat seal layers common in the art also include blends, in varying percentages, of the above-referenced polymers.
In this embodiment of the film, when force is applied to the heat seal, such as by the force associated with pulling apart by hand, the sealant layer 11 separates from the first layer 10 at point 12.
FIG. 2 depicts a second embodiment of the films of the invention. In this embodiment, layer 20 is the first interior layer and layer 21 is the outer sealant layer. As in the first embodiment, the first interior layer 20 and outer sealant layer 21 are disposed in surface-to-surface contact. The substrate is represented by layer 22. Layer 20 and layer 22 are adhered through any of several methods common in the art, such as by lamination.
As in the first embodiment, when force is applied to the heat seal, such as the force associated with pulling apart by hand, the sealant layer 21 separates from the first layer 20 at point 23.
The substrate layer 22 may be an additional film, to which the film of the invention is bonded by any of several methods common in the art, including by way of an adhesive or through lamination. Alternatively, the substrate 22 may be comprised of a material such as paper, cardboard, metal or any of several other materials.

Claims (6)

What is claimed is:
1. A multilayer, heat sealable polymeric film, comprising a first interior layer comprising polypropylene and a polymer selected from the group consisting of an ionomer, an acid copolymer, EVA, LDPE, and LLDPE; a second outer layer comprising polybutylene and a polymer selected from the group consisting of LDPE, LLDPE, EVA, EAA, and an ionomer, said second outer layer being heat sealable; said first interior layer and said second outer layer being disposed in face-to-face contact, wherein said first interior layer and said second outer layer form a delamination type peelable seal.
2. A film as described in claim 1, wherein said film is coextruded.
3. A film as described in claim 1, wherein said first interior layer is laminated to a substrate.
4. A film as described in claim 1, wherein said substrate is selected from the group consisting of paper, cardboard, and metal.
5. A package made from the film of any of claims 1 to 4, wherein said first interior layer is heat sealed to itself.
6. A package made from the film of any of claims 1 to 4, wherein said first interior layer is heat sealed to a second polymeric film.
US08/682,413 1996-07-17 1996-07-17 Heat sealable packaging materials having a peelable, easy-opening feature Abandoned USH1727H (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/682,413 USH1727H (en) 1996-07-17 1996-07-17 Heat sealable packaging materials having a peelable, easy-opening feature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/682,413 USH1727H (en) 1996-07-17 1996-07-17 Heat sealable packaging materials having a peelable, easy-opening feature

Publications (1)

Publication Number Publication Date
USH1727H true USH1727H (en) 1998-05-05

Family

ID=24739578

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/682,413 Abandoned USH1727H (en) 1996-07-17 1996-07-17 Heat sealable packaging materials having a peelable, easy-opening feature

Country Status (1)

Country Link
US (1) USH1727H (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358622B1 (en) 1999-12-16 2002-03-19 M.S.I. Technology L.L.C. Heat sealable films
WO2002062575A3 (en) * 2001-02-05 2002-10-10 Cryovac Inc Peelably sealed packaging
US6476137B1 (en) 1998-04-16 2002-11-05 Cryovac, Inc. Ternary polymer blend, the film containing it, and the easy-to-open package made therewith
US6590034B2 (en) 2001-01-02 2003-07-08 Dow Global Technologies Inc. Peelable seal and method of making and using same
US20040151932A1 (en) * 2003-02-05 2004-08-05 Deane Galloway Easy peel film structures
US20050129811A1 (en) * 2003-12-10 2005-06-16 Kraimer Amy L. Frangible heat-sealable films for cook-in applications and packages made thereof
US20050235611A1 (en) * 2004-02-20 2005-10-27 George Roussos Multilayer heat shrinkable film comprising styrene polymer or a blend of styrene polymers
US20050266257A1 (en) * 2004-05-24 2005-12-01 I-Hwa Lee Polymer blends for peelable and/or permanent seals
US7213305B2 (en) 2002-06-17 2007-05-08 Illinois Tool Works, Inc. Peel seal tamper evident slider bag
US7265183B2 (en) 2004-11-01 2007-09-04 Ticona Llc High clarity, low friction polyethylene compositions for films
US20080249247A1 (en) * 2003-10-17 2008-10-09 Baxter International Inc. High impact strength film and non-pvc containing container and pouch and overpouch
CN101942133A (en) * 2010-08-13 2011-01-12 黄山永新股份有限公司 Polyethylene film and laminated film with even heat-seal strength
US9434138B2 (en) 2014-04-21 2016-09-06 Inteplast Group Corporation Peelable, non-sticky, heat-sealable film for packaging fatty and pasty foods

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944409A (en) * 1988-02-10 1990-07-31 Curwood, Inc. Easy open package

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4944409A (en) * 1988-02-10 1990-07-31 Curwood, Inc. Easy open package

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6476137B1 (en) 1998-04-16 2002-11-05 Cryovac, Inc. Ternary polymer blend, the film containing it, and the easy-to-open package made therewith
US6358622B1 (en) 1999-12-16 2002-03-19 M.S.I. Technology L.L.C. Heat sealable films
US6590034B2 (en) 2001-01-02 2003-07-08 Dow Global Technologies Inc. Peelable seal and method of making and using same
WO2002062575A3 (en) * 2001-02-05 2002-10-10 Cryovac Inc Peelably sealed packaging
US6630237B2 (en) 2001-02-05 2003-10-07 Cryovac, Inc. Peelably sealed packaging
US7213305B2 (en) 2002-06-17 2007-05-08 Illinois Tool Works, Inc. Peel seal tamper evident slider bag
US7314669B2 (en) * 2003-02-05 2008-01-01 Pechiney Emballage Flexible Europe Easy peel film structures
US20040151932A1 (en) * 2003-02-05 2004-08-05 Deane Galloway Easy peel film structures
US20080063821A1 (en) * 2003-02-05 2008-03-13 Pechiney Emballage Flexible Europe Easy Peel Film Structures
US20080249247A1 (en) * 2003-10-17 2008-10-09 Baxter International Inc. High impact strength film and non-pvc containing container and pouch and overpouch
US20050129811A1 (en) * 2003-12-10 2005-06-16 Kraimer Amy L. Frangible heat-sealable films for cook-in applications and packages made thereof
US7276269B2 (en) 2003-12-10 2007-10-02 Curwood, Inc. Frangible heat-sealable films for cook-in applications and packages made thereof
US20050235611A1 (en) * 2004-02-20 2005-10-27 George Roussos Multilayer heat shrinkable film comprising styrene polymer or a blend of styrene polymers
US9950501B2 (en) 2004-02-20 2018-04-24 Flexopack S.A. Plastics Industry Multilayer heat shrinkable film comprising styrene polymer or a blend of styrene polymers
US20050266257A1 (en) * 2004-05-24 2005-12-01 I-Hwa Lee Polymer blends for peelable and/or permanent seals
US7265183B2 (en) 2004-11-01 2007-09-04 Ticona Llc High clarity, low friction polyethylene compositions for films
CN101942133A (en) * 2010-08-13 2011-01-12 黄山永新股份有限公司 Polyethylene film and laminated film with even heat-seal strength
CN101942133B (en) * 2010-08-13 2014-04-09 黄山永新股份有限公司 Polyethylene film and laminated film with even heat-seal strength
US9434138B2 (en) 2014-04-21 2016-09-06 Inteplast Group Corporation Peelable, non-sticky, heat-sealable film for packaging fatty and pasty foods

Similar Documents

Publication Publication Date Title
US5888648A (en) Multi-layer hermetically sealable film and method of making same
US4521467A (en) Ultrasonically-sealable peelable seal
JP4522562B2 (en) Packaging materials and containers
EP0175451A2 (en) Flexible multiple layer packaging film and packages made from such film
US4700531A (en) Method of forming a package having strong seals and a modified ply-separation opening
USH1727H (en) Heat sealable packaging materials having a peelable, easy-opening feature
US6355732B1 (en) Peel seal blend of 1-polybutylene, m-LLDPE and LDPE with high hot tack
WO1998010929A9 (en) Hermetically sealable film and method of making
JPS5981168A (en) Multilayer pasting flexible structure for packing
EP0364301A3 (en) Nonoriented polyester films with modified heat seal layer
GB2360038A (en) Heat sealable polymeric films
US6475578B1 (en) Flexible packaging peelable seal system
JP2018099814A (en) Laminate
EP0785066B1 (en) Peelable heat seals and method for making same
JP2017019527A (en) Packaging materials and packages
JPH0494933A (en) Peelable film
JP3867474B2 (en) Easy-open composite film and packaging container
JP2005271972A (en) Easy-to-open multi-layer container
JP3155303B2 (en) Resin composition for heat sealing
JP3447229B2 (en) Packaging laminate and easy-open packaging
JP2007076281A (en) Laminated packaging material and packaging bag using the same
JPS61193848A (en) Easy-open shrinkable laminate
GB2362587A (en) Sheet materials for resealable packages
JP3780075B2 (en) Easy-open composite film for heat-resistant containers
JPH02108538A (en) Coextruded film with easy-peel sealant

Legal Events

Date Code Title Description
AS Assignment

Owner name: AMERICAN NATIONAL CAN COMPANY, ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JONES, GREGORY K.;SHEPARD, MARY E.;REEL/FRAME:008156/0957

Effective date: 19960923

STCF Information on status: patent grant

Free format text: PATENTED CASE

AS Assignment

Owner name: PECHINEY PLASTIC PACKAGINC, INC., ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN NATIONAL CAN COMPANY;REEL/FRAME:012463/0131

Effective date: 20011112