US4048378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive laminated packaging materials
Assignee: Browne Packaging Inc
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Filing: 1976-12-08
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Granted: 1977-09-13
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Expires: 1996-12-08
Abstract
Abstract A three-ply, flexible, laminated, heat-sealable packaging material which is resistant to flex cracking and pinhole development is made by bonding an inner film of a heat-sealable polymeric material to one surface of a core film of biaxially oriented polypropylene coated on both sides with Saran and by bonding an outer film of biaxially oriented polypropylene to the other surface of the core film with an adhesive composition including bond formers consisting essentially of about 70 to about 90 weight % of an ethylene-vinyl acetate copolymer which contains about 20 to about 40 weight % vinyl acetate, about 10 to about 30 weight % of a tackifying resin, and 0 to about 5 weight % of a plasticizer. A coating of the adhesive composition is applied to the inner surface of the outer film as an organic solvent solution and the coating dried to provide a residual layer of the bond formers which provides the bond between the core film and the outer film. A two-ply, heat-sealable packaging material is made by omitting the outer film and bonding a film similar to the above core film to an inner film of a heat-sealable polymeric material with the above adhesive composition.
Inventors
- 👤 Victor J. Pelzek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:22
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B27/36; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2439/00; B32B2439/70; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A flexible, laminated, heat-sealable packaging material comprising a core film of biaxially oriented polypropylene coated on both sides with a layer of a vinylidene chloride copolymer, an inner film of a heat-sealable polymeric material bonded to one side of said core film, and an outer film of biaxially oriented polypropylene or a polyethylene terephthalate bonded to the other side of said core film by an intervening adhesive layer consisting essentially of about 70 to about 90 weight % of an ethylene-vinyl acetate copolymer which contains about 20 to about 40 weight % vinyl acetate, about 10 to about 30 weight % of a tackifying resin, and 0 to about 5 weight % of a plasticizer which is compatible with said ethylene-vinyl acetate copolymer.
Claim 2
Dependent Claim
123 words
A flexible, laminated, heat-sealable packaging material comprising a core film of biaxially oriented polypropylene coated on both sides with a layer of a vinylidene chloride copolymer, an inner film of a heat-sealable polymeric material bonded to one side of said core film, and an outer film of biaxially oriented polypropylene or a polyethylene terephthalate bonded to the other side of said core film by an intervening adhesive layer consisting essentially of about 70 to about 90 weight % of an ethylene-vinyl acetate copolymer which contains about 20 to about 40 weight % vinyl acetate, about 10 to about 30 weight % of a tackifying resin, and 0 to about 5 weight % of a plasticizer which is compatible with said ethylene-vinyl acetate copolymer.
Claim 3
Dependent Claim
31 words
A packaging material according to claim 1 wherein said tackifying resin is selected from the group consisting of rosins, rosin polymers, polyhydric alkanol esters of rosin, terpene-phenol resins, and mixtures thereof.
Claim 4
Dependent Claim
33 words
A packaging material according to claim 2 wherein said inner film is composed of co-extruded layers of polyethylene and an ethylene-vinyl acetate copolymer with the polyethylene layer thereof bonded to said core film.
Claim 5
Dependent Claim
45 words
A packaging material according to claim 3 wherein said adhesive layer is composed of about 76 weight % of said ethylene-vinyl acetate copolymer, about 22.5 weight % of a glycerol ester of polymerized rosin and about 1.5 weight % of an alkyl aryl phosphate plasticizer.
Claim 6
Dependent Claim
95 words
A flexible, laminated, heat-sealable packaging material comprising an outer film of biaxially oriented polypropylene or a polyethylene terephthalate, and an inner film of a heat-sealable, polymeric material bonded to one side of said outer film by an intervening adhesive layer consisting essentially of about 70 to about 90 weight % of an ethylene-vinyl acetate copolymer which contains about 20 to about 40 weight % vinyl acetate, about 10 to about 30 weight % of a tackifying resin, and 0 to about 5 weight % of a plasticizer which is compatible with said ethylene-vinyl acetate copolymer.
Claim 7
Dependent Claim
95 words
A flexible, laminated, heat-sealable packaging material comprising an outer film of biaxially oriented polypropylene or a polyethylene terephthalate, and an inner film of a heat-sealable, polymeric material bonded to one side of said outer film by an intervening adhesive layer consisting essentially of about 70 to about 90 weight % of an ethylene-vinyl acetate copolymer which contains about 20 to about 40 weight % vinyl acetate, about 10 to about 30 weight % of a tackifying resin, and 0 to about 5 weight % of a plasticizer which is compatible with said ethylene-vinyl acetate copolymer.
Claim 8
Dependent Claim
25 words
A packaging material according to claim 5 wherein at least one side of said outer film is coated with a layer of a vinylidene chloride.
Claim 9
Dependent Claim
33 words
A packaging material according to claim 6 wherein said inner film is composed of co-extruded layers of polyethylene and an ethylene-vinyl acetate copolymer with the polyethylene layer thereof bonded to said outer film.
Claim 10
Dependent Claim
34 words
A flexible, laminated, heat-sealable packaging material according to claim 5 wherein said tackifying resin is selected from the group consisting of rosins, rosin polymers, polyhydric alkanol esters of rosin, terpene-phenol resins, and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |