Patent US4364989A successfully refreshed from Google Patents.
US4364989A
Expired / Lapsed
US
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Snack food packaging material
Assignee: HRF PACKAGING CORP
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Filing: 1981-03-19
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Granted: 1982-12-21
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Expires: 2001-03-19
Abstract
Abstract The disclosure relates to a multi-layer snack food packaging material particularly suitable for forming potato chip bags and the like. The material comprises an outer layer of polypropylene, a low density polyethylene laminator and an inner layer which is, itself, a coextrusion. The inner coextruded layer comprises a first layer of high density polyethylene, a second layer of polypropylene and a third layer of ethylene methyl acrylate. The ethylene methyl acrylate is coated with an emulsion of polyvinylidene chloride, which seals the inner layers together upon application of heat. The package has many advantageous characteristics for use in snack food packaging and does not require glassine. The material has excellent oxygen and moisture barrier properties, good stiffness, good grease resistance and bond strength appropriate for easy opening by the consumer.
Inventors
- 👤 LaMont E. Moyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A flexible, heat sealable packaging material which comprises a lamination of (a) an outer film of polypropylene, (b) a laminate of low density polyethylene, and (c) an inner coextruded film which includes a coextrusion of high density polyethylene, polypropylene and ethylene methyl acrylate, said ethylene methyl acrylate having a coating of a polyvinylidene chloride emulsion on its exposed surface.
Claim 2
Dependent Claim
59 words
A flexible, heat sealable packaging material which comprises a lamination of (a) an outer film of polypropylene, (b) a laminate of low density polyethylene, and (c) an inner coextruded film which includes a coextrusion of high density polyethylene, polypropylene and ethylene methyl acrylate, said ethylene methyl acrylate having a coating of a polyvinylidene chloride emulsion on its exposed surface.
Claim 3
Dependent Claim
15 words
The packaging material according to claim 1, wherein the low density polyethylene is pigmented white.
Claim 4
Dependent Claim
15 words
The packaging material according to claim 2, wherein the high density polyethylene is pigmented white.
Claim 5
Dependent Claim
47 words
The packaging material according to claim 1, wherein (a) said outer film has a thickness within the range of about 1.00 mils to about 0.25 mils, and (b) said inner film has a total thickness within the range of from about 1.5 mils to about 2.5 mils.
Claim 6
Dependent Claim
32 words
The packaging material according to claim 4, wherein (a) said outer film has a thickness of approximately 0.45 mils, and (b) said inner film has a total thickness of approximately 2.2 mils.
Claim 7
Dependent Claim
71 words
The packaging material according to claim 1, wherein (a) said high density polyethylene portion of said inner film has a thickness within the range of 0.2 to 2.0 mils, (b) said polypropylene portion of said inner coextruded film has a thickness within the range of 0.2 to 2.0 mils, and (c) said ethylene methyl acrylate portion of said inner film has a thickness within the range of 0.2 to 0.5 mils.
Claim 8
Dependent Claim
59 words
The packaging material according to claim 6, wherein (a) said high density polyethylene portion of said inner film has a thickness of approximately 1 mil, (b) said polypropylene portion of said inner coextruded film has a thickness of approximately 1 mil, and (c) said ethylene methyl acrylate portion of said inner film has a thickness of approximately 0.2 mils.
Claim 9
Dependent Claim
18 words
The packaging material according to claim 1, wherein the polypropylene in the inner coextruded film is pigmented chocolate.
Claim 10
Dependent Claim
20 words
The packaging material according to claims 1, 3 or 6, wherein the polypropylene of the outer film is oriented polypropylene.
Claim 11
Dependent Claim
100 words
A snack food package which comprises a lamination of (a) an outer film of polypropylene, (b) a laminate of low density polyethylene, and (c) an inner coextruded film which includes a coextrusion of high density polyethylene, polypropylene and ethylene methyl acrylate, said ethylene methyl acrylate having a coating of polyvinylidene chloride emulsion on its exposed surface, (d) said package being formed at least in part by heat sealing a first portion of ethylene methyl acrylate inner layer to a second portion of ethylene methyl acrylate inner layer by bonding together the polyvinylidene chloride coatings of said first and second portions.
Claim 12
Dependent Claim
100 words
A snack food package which comprises a lamination of (a) an outer film of polypropylene, (b) a laminate of low density polyethylene, and (c) an inner coextruded film which includes a coextrusion of high density polyethylene, polypropylene and ethylene methyl acrylate, said ethylene methyl acrylate having a coating of polyvinylidene chloride emulsion on its exposed surface, (d) said package being formed at least in part by heat sealing a first portion of ethylene methyl acrylate inner layer to a second portion of ethylene methyl acrylate inner layer by bonding together the polyvinylidene chloride coatings of said first and second portions.
Claim 13
Dependent Claim
16 words
The packaging material according to claim 10, wherein the outer film of polypropylene is oriented 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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |