Plastic film for container end closures

Claim 2

The improvement of claim 2 wherein said plug is secured to said panel along the major portion of said panel that forms and surrounds said aperture.

Claim 3

The improvement of claim 3 wherein said pull tab extends away from said aperture at a point where said plug is free from securement to said panel.

Claim 4

The improvement of claim 1 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 5

The improvement of claim 2 wherein said end closure also comprises: a relatively hard sealing maTerial sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 6

The improvement of claim 3 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 7

The improvement of claim 4 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 8

The improvement of claim 5 wherein said hard sealing material is a solid plastisol.

Claim 9

The improvement of claim 9 wherein said soft sealing material is a foamed plastisol.

Claim 10

The improvement of claim 6 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 11

The improvement of claim 7 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 12

The improvement of claim 8 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 13

An improvement in an end closure for a container body comprising: a central panel having an aperture therein; a thin, substantially rigid plug within said aperture and secured to said panel by crimping along the major portion of the periphery of said plug, and said plug being coated on its bottom surface with an organic primer that is adherent to container metals; a pull tab for removing a tear-out portion from said plug, said tab extending away from said aperture at a point where said plug is free from securement to said panel, said tear-out area defined by score lines in said plug; a relatively hard solid plastisol sealing material sealing said plug with said panel along said major secured portion of the periphery of said plug; and a soft, pliable foamed plastisol sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug, the cross section of said soft sealing material being greater than the cross section of said hard sealing material in order to provide adequate strength where said plug is free from securement to said panel; the improvement which comprises including on said primercoated surface an essentially solvent-free acrylic multipolymer film comprising a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2 ) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, said film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said plug and/or contamination of said product.

Claim 14

The improvement of claim 14 wherein said plug is an aluminum metal alloy.

Claim 15

The improvement of claim 15 wherein said primer and said film are also included on said panel.

Claim 16

An improvement in an end closure for a container body comprising a central panel having score lines and easy-opening means for effecting an opening within said score lines in said panel, said panel being coated with an organic primer that is adherent to container mEtals; the improvement which comprises applying to said primer an essentially solvent-free acrylic multipolymer film comprising a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, the film being adherent to said primer and being for isolating said panel from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.

Claim 17

An improvement in an end closure for a container body comprising a central panel coated with an organic primer that is adherent to container metals; the improvement which comprises applying to said primer an essentially solvent-free acrylic multipolymer film comprising a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, the film being adherent to said primer and being for isolating said panel from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.

Claim 18

An improvement in an end closure for a container body comprising: a central panel having an aperture therein; a thin, substantially rigid plug within said aperture and secured to said panel along the portion of said panel that forms and surrounds said aperture, said plug including a tear-out portion defined by weakened lines in said plug, and said plug being coated on its bottom surface with an organic primer that is adherent to container metals; a pull tab for removing said tear-out portion from said plug; the improvement which comprises including on said bottom surface an essentially solvent-free hard unplasticized thermoplastic film comprising from about 85 to 100 percent polyvinyl chloride and from about 15 to 0 percent polyvinyl acetate, the film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said plug and/or contamination of said product.

Claim 19

The improvement of claim 19 wherein said plug is an aluminum metal alloy.

Claim 20

The improvement of claim 20 wherein said plug is secured to said panel along the major portion of said panel that forms and surrounds said aperture.

Claim 21

The improvement of claim 21 wherein said pull tab extends away from said aperture at a point where said plug is free from securement to said panel.

Claim 22

The improvement of claim 19 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 23

The improvement of claim 20 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 24

The improvement of claim 21 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 25

The improvement of claim 22 wherein said end closure also comprises: a relatively hard sEaling material sealing said plug to said panel along said surrounding portion of said plug; a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 26

The improvement of claim 19 wherein said hard sealing material is a solid plastisol.

Claim 27

The improvement of claim 27 wherein said soft sealing material is a foamed plastisol.

Claim 28

The improvement of claim 24 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 29

The improvement of claim 25 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 30

The improvement of claim 26 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 31

An improvement in an end closure for a container body comprising: a central panel having an aperture therein; a thin, substantially rigid plug within said aperture and secured to said panel by crimping along the major portion of the periphery of said plug, and said plug being coated on its bottom surface with an organic primer that is adherent to container metals; a pull tab for removing a tear-out portion from said plug, said tab extending away from said aperture at a point where said plug is free from securement to said panel, said tear-out area defined by score lines in said plug; a relatively hard solid plastisol sealing material sealing said plug with said panel along said major secured portion of the periphery of said plug; and a soft, pliable foamed plastisol sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug; the cross section of said soft sealing material being greater than the cross section of said hard sealing material in order to provide adequate strength where said plug is free from securement to said panel; the improvement which comprises including on said primercoated bottom surface an essentially solvent-free hard unplasticized thermoplastic film comprising from about 85 to 100 percent polyvinyl chloride and from about 15 to 0 percent polyvinyl acetate, the film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said plug and/or contamination of said product.

Claim 32

The improvement of claim 32 wherein said plug is an aluminum metal alloy.

Claim 33

The improvement of claim 14 wherein said primer and said film are also included on said panel.

Claim 34

An improvement in an end closure to a container body comprising a central panel having score lines and easy-opening means for effecting an opening within said score lines in said panel, said panel being coated with an organic primer that is adherent to container metals; the improvement which comprises including on the bottom surface of said panel an essentially solvent-free hard unplasticized thermoplastic film comprising from about 85 to 100 percent polyvinyl chloride and about 15 to 0 percent polyvinyl acetate, the film being adherent to said primer and being for isolating said panel from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.

Claim 35

An improvement in an end closure to a container body comprising a central panel coated with an organic primer that is adherent to container metals; the improvement which comprises including on the bottom surface of said panel an essentially solvent-free hard unplasticized thermoplastic film comprising from about 85 to 100 percent polyvinyl chloride and about 15 to 0 percent polyvinyl acetate, the fiLm being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.

Claim 36

An improvement in an end closure for a container body comprising: a central panel having an aperture therein; a thin, substantially rigid plug within said aperture and secured to said panel along the portion of said panel that forms and surrounds said aperture, said plug including a tear-out portion defined by weakened lines in said plug, and said plug being coated on its bottom surface with an organic primer that is adherent to container metals; a pull tab for removing said tear-out portion from said plug; the improvement which comprises including on said bottom surface an essentially solvent-free hard unplasticized thermoplastic film selected from the group consisting of (A) a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, (B) a polyvinyl chloride, and (C) a copolymer comprising about 85 percent vinyl chloride and about 13 percent vinyl acetate, the film being adhered to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said plug and/or contamination of said product.

Claim 37

The improvement of claim 37 wherein said plug is an aluminum metal alloy.

Claim 38

The improvement of claim 38 wherein said end closure also comprises: a relatively hard sealing material sealing said plug to said panel along said surrounding portion of said plug; and a soft, pliable sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out portion from said plug.

Claim 39

The improvement of claim 39 wherein said hard sealing material is a solid plastisol and said soft sealing material is a foamed plastisol.

Claim 40

An improvement in an end closure for a container body comprising: a central panel having an aperture therein; a thin, substantially rigid plug within said aperture and secured to said panel by crimping along the major portion of the periphery of said plug, and said plug being coated on its bottom surface with an organic primer that is adherent to container metals; a pull tab for removing a tear-out portion from said plug, said tab extending away from said aperture at a point where said plug is free from securement to said panel, said tear-out area defined by score lines in said plug; a relatively hard solid plastisol sealing material sealing said plug with said panel along said major secured portion of the periphery of said plug; and a soft, pliable foamed plastisol sealing material hermetically sealing said plug with said panel where said plug and said tab join to reduce tensional forces tending to fracture said tab as it is pulled to remove said tear-out area from said plug, the cross section of said soft sealing material being greater than the cross section of said hard sealing material in order to provide adequate strength where said plug is free from securement to said panel; the improvement which comprises including on said bottom surface an essentially solvent-free hard unplasticized thermoplastic film selected from the group consisting of (A) a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, (B) a polyvinyl chloride, and (C) a copolymer comprising about 85 percent vinyl chloride and about 13 percent vinyl acetate, the film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of Said plug and/or contamination of said product.

Claim 41

The improvement of claim 41 wherein said plug is an aluminum metal alloy.

Claim 42

The improvement of claim 37 wherein said primer and said film are also included on said panel.

Claim 43

An improvement in an end closure for a container body comprising: a central panel having score lines and easy-opening means for effecting an opening within said score lines in said panel, the bottom surface of said panel being coated with an organic primer that is adherent to container metals; the improvement which comprises including on said bottom surface an essentially solvent-free hard unplasticized thermoplastic film selected from the group consisting of (A) a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, (B) a polyvinyl chloride, and (C) a copolymer of about 85 percent vinyl and about 13 percent vinyl acetate, said film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.

Claim 44

An improvement in an end closure to a container body comprising a central panel coated with an organic primer that is adherent to container metals; the improvement which comprises including on the bottom surface of said panel an essentially solvent-free hard unplasticized thermoplastic film selected from the group consisting of (A) a blend of (1) a hard, resinous terpolymer of acrylonitrile, styrene and methyl methacrylate, and (2) polybutadiene grafted with methyl methacrylate, styrene and acrylonitrile, (B) a polyvinyl chloride, and (C) a copolymer of about 85 percent vinyl and about 13 percent vinyl acetate, said film being adherent to said primer and being for isolating said surface from a product to be contained within said container body and for preventing deterioration of said panel and/or contamination of said product.