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Patent US4565739A successfully refreshed from Google Patents.
US4565739A
Expired / Lapsed
US
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Oriented multi-layer heat sealable film
Assignee: Mobil Oil AS
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Filing: 1984-12-28
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Granted: 1986-01-21
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Expires: 2004-12-28
Abstract
Abstract An oriented multi-layer heat sealable film structure comprising a polyolefin film substrate, a layer of a member selected from the group consisting of MDPE, HDPE, mixtures thereof and blends of (I) said member and (II) polypropylene, a primer layer on the skin layer and a heat sealable layer on said primer layer.
Inventors
- 👤 Melvil B. Clauson
- 👤 John R. Wagner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:27
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/308; B32B27/32; 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; Y10T428/13; Y10T428/1334; Y10T428/1341; Y10T428/1352; Y10T428/1379; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31935
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A heat sealable multi-layer structure comprising: (a) a substrate comprising a polyolefin film; (b) a skin layer on at least one surface of (a), said layer comprising a member selected from the group consisting of a medium density polyethylene, a high density polyethylene, mixtures thereof and blends of (I) said member and (II) polypropylene; (c) a primer coating between layers (b) and (d) on at least one of said layer (b); and (d) a heat sealable layer on said coating (c) said heat sealable layer being a member selected from the group consisting of a vinylidene chloride polymer and an acrylic polymer.
Claim 2
Dependent Claim
102 words
A heat sealable multi-layer structure comprising: (a) a substrate comprising a polyolefin film; (b) a skin layer on at least one surface of (a), said layer comprising a member selected from the group consisting of a medium density polyethylene, a high density polyethylene, mixtures thereof and blends of (I) said member and (II) polypropylene; (c) a primer coating between layers (b) and (d) on at least one of said layer (b); and (d) a heat sealable layer on said coating (c) said heat sealable layer being a member selected from the group consisting of a vinylidene chloride polymer and an acrylic polymer.
Claim 3
Dependent Claim
26 words
The structure of claim 1 wherein said polyolefin film comprises homopolymer polypropylene interblended with from 0 to about 15 parts by weight of said layer (b).
Claim 4
Dependent Claim
79 words
The structure of claim 2 wherein said primer comprises a member selected from the group consisting of poly(ethyleneimine); the reaction product of an acidified aminoethylated vinyl polymer and an epoxy resin; the condensation product of a monoaldehyde with an interpolymer of acrylamide or methacrylamide and at least one other unsaturated monomer; and the condensation product of aminoaldehyde with acrylamide or methacrylamide interpolymerized with at least one other unsaturated monomer in the presence of a C 1 -C 6 alkanol.
Claim 5
Dependent Claim
17 words
The structure of claim 3 wherein said coextruded layer (b) is on one surface of substrate (a).
Claim 6
Dependent Claim
16 words
The structure of claim 3 wherein said coextruded layer is on both surfaces of substrate (a).
Claim 7
Dependent Claim
24 words
The structure of claim 1 wherein said heat sealable layer comprises a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride.
Claim 8
Dependent Claim
48 words
The structure of claim 1 wherein said heat sealable layer comprises an interpolymer of (a) a minor amount by weight of acrylic acid, methacrylic acid or mixtures thereof and (b) a major amount of neutral monomer esters comprising (1) methyl acrylate or ethyl acrylate and (2) methyl methacrylate.
Claim 9
Dependent Claim
33 words
The structure of claim 1 wherein said heat sealable acrylic polymer is on one surface of the structure and said heat sealable vinylidene chloride polymer is on the opposite surface of said structure.
Claim 10
Dependent Claim
26 words
The structure of claim 1 wherein the density of said medium density polyethylene is from 0.926-0.940 and said high density polyethylene is from 0.941 to 0.965.
Claim 11
Dependent Claim
19 words
The structure of claim 9 wherein said blend can be from 2-100% of said polyethylene and from 98-0% polypropylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |