Patent US4944990A successfully refreshed from Google Patents.
US4944990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oriented white opaque multilayer heat sealable film and method of forming same
Assignee: Mobil Oil AS
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Filing: 1988-06-16
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Granted: 1990-07-31
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Expires: 2008-06-16
Abstract
Abstract A multi-layer heat sealable structure comprising a substrate including a white opaque polyolefin film, which is preferably cavitated. A second layer is coextruded on at least one surface of the substrate. The second layer includes a heat sealable homopolymer, copolymer, terpolymer or blend thereof. A primer coating is disposed on at least one surface of the second layer. A heat sealable layer is disposed on the primer coating. The heat sealable layer includes a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride. A method for producing the present multi-layer heat sealable structure is also disclosed.
Inventors
- 👤 Leland L. Liu
- 👤 Patricia A. Cyr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:16
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/38; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/41; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2323/10; B32B2327/00; B32B2363/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1376; Y10T428/1379; Y10T428/249921; Y10T428/249953; Y10T428/28; Y10T428/2843; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31935
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
A multi-layer heat sealable structure comprising: (a) a substrate having a white opaque, cavitated polyolefin film; (b) a second layer coextruded on at least one surface of said substrate, said second layer including a heat sealable homopolymer, copolymer, terpolymer or blend thereof; (c) a primer coating on at least one surface of said second layer (b) the surface having been previously treated to increase the energy of the surface; and (d) a heat sealable layer on said primer coating (c), said heat sealable layer including a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride.
Claim 2
Dependent Claim
98 words
A multi-layer heat sealable structure comprising: (a) a substrate having a white opaque, cavitated polyolefin film; (b) a second layer coextruded on at least one surface of said substrate, said second layer including a heat sealable homopolymer, copolymer, terpolymer or blend thereof; (c) a primer coating on at least one surface of said second layer (b) the surface having been previously treated to increase the energy of the surface; and (d) a heat sealable layer on said primer coating (c), said heat sealable layer including a vinylidene chloride copolymer containing at least 50% by weight of vinylidene chloride.
Claim 3
Dependent Claim
27 words
The multi-layer heat sealable structure of claim 1 wherein said polyolefin film is selected from the group consisting of polyethylene, polypropylene, polybutene and copolymers and blends thereof.
Claim 4
Dependent Claim
15 words
The multi-layer heat sealable structure of claim 1 wherein said polyolefin film includes homopolymer polypropylene.
Claim 5
Dependent Claim
26 words
The multi-layer heat sealable structure of claim 1 wherein said polyolefin film is an isotactic polypropylene containing at least about 80% by weight of isotactic polypropylene.
Claim 6
Dependent Claim
31 words
The multi-layer heat sealable structure of claim 1 wherein said homopolymer comprises a member selected from the group consisting of high density polyethylene, medium density polyethylene, and linear low density polyethylene.
Claim 7
Dependent Claim
20 words
The multi-layer sealable heat structure of claim 1 wherein the copolymer of said second layer is an ethylene-propylene random copolymer.
Claim 8
Dependent Claim
34 words
The multi-layer heat sealable structure of claim 6 wherein said random copolymer includes from about 0.5 to about 10% by weight of ethylene and from about 90 to about 99.5% by weight of propylene.
Claim 9
Dependent Claim
31 words
The multi-layer sealable heat structure of claim 1 wherein the copolymer of said second layer is an ethylene-propylene block copolymer which contains about 10 to about 30 weight percent of ethylene.
Claim 10
Dependent Claim
38 words
The multi-layer heat sealable structure of claim 1 wherein said second layer is an ethylene-propylene-1-butene terpolymer which contains from about 1 to about 7 weight percent ethylene and from about 1 to about 7 weight percent of 1-butene.
Claim 11
Dependent Claim
30 words
The multi-layer heat sealable structure of claim 1 wherein the terpolymer of said second layer has a melt flow rate at 446° F. ranging from about 2 to about 10.
Claim 12
Dependent Claim
29 words
The multi-layer heat sealable structure of claim 1 wherein the terpolymer of said second layer has a melt flow rate at 446°F. ranging from about 4 to about 6.
Claim 13
Dependent Claim
82 words
The multi-layer heat sealable structure of claim 1 wherein said primer coating comprises a member selected from the group consisting of the reaction product of an epoxy resin and an acidified aminoethylated vinyl polymer; 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 amino-aldehyde with acrylamide or methacrylamide interpolymerized with at least one other unsaturated monomer in the presence of a C 1 -C 6 alkanol.
Claim 14
Dependent Claim
18 words
The multi-layer heat sealable structure of claim 12 wherein said epoxy resins are glycidyl ethers of polyhydroxy compounds.
Claim 15
Dependent Claim
49 words
The multi-layer heat sealable structure of claim 13 wherein said polyhydroxy compound includes a monomer selected from the group consisting of bisphenol A, ring substituted bisphenol A, resorcinol, hydroquinone, phenol-formaldehyde, novolac resins, aliphatic diols, such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, glycerol, lower alkyl hydantoins and mixtures thereof.
Claim 16
Dependent Claim
24 words
The multi-layer heat sealable structure of claim 12 wherein said epoxy resin has an epoxy equivalent weight ranging from about 170 to about 280.
Claim 17
Dependent Claim
18 words
The multi-layer heat sealable structure of claim 12 wherein said acidified aminoethylated vinyl polymer includes pendant aminoalkylate groups.
Claim 18
Dependent Claim
30 words
The multi-layer heat sealable structure of claim 1 wherein said vinylidene chloride copolymer of heat sealable layer (d) contains from about 75% to about 92% by weight of vinylidene chloride.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |