US4937112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength coextruded film for chub packaging
Assignee: Cryovac LLC
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Filing: 1987-12-18
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Granted: 1990-06-26
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Expires: 2007-12-18
Abstract
Abstract A multilayer hot blown film useful in chub packaging comprises a first outer layer of a heat-sealable polymeric material; a first interior layer of a high molecular weight polymeric material; a second interior layer of a polyamide; and a second outer layer of a self-weldable polymeric material.
Inventors
- 👤 Henry G. Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B1/00; B32B1/08; B32B27/30; B32B27/304; B32B27/306; B32B27/34; B32B2250/00; B32B2250/24; B32B2307/00; B32B2307/30; B32B2307/31; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; B32B2329/00; B32B2331/00; B32B2377/00; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1303; Y10T428/1307; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A multilayer hot blown film useful in chub packaging comprising: (a) a first outer layer comprising a heat sealable material selected from the group consisting of linear low density polyethylene, very low density polyethylene, and blends thereof; (b) a first interior layer adjacent the first outer layer comprising a polymeric material of high molecular weight and fractional melt index selected from the group consisting of high density polyethylene, low density polyethylene and ethylene vinyl acetate copolymer; (c) a second interior layer comprising a polyamide; (d) a second outer layer comprising a self-weldable polymeric material selected from the group consisting of copolyamide and ethylene vinyl acetate copolymer; (e) an adhesive layer disposed between the first and second interior layers and comprising a chemically modified ethylene unsaturated ester copolymer; and (f) an oxygen barrier layer disposed between the second interior layer and the second outer layer and comprising a material selected from the group consisting of ethylene vinyl alcohol copolymer, vinylidene chloride copolymer and polyamide.
Claim 2
Dependent Claim
163 words
A multilayer hot blown film useful in chub packaging comprising: (a) a first outer layer comprising a heat sealable material selected from the group consisting of linear low density polyethylene, very low density polyethylene, and blends thereof; (b) a first interior layer adjacent the first outer layer comprising a polymeric material of high molecular weight and fractional melt index selected from the group consisting of high density polyethylene, low density polyethylene and ethylene vinyl acetate copolymer; (c) a second interior layer comprising a polyamide; (d) a second outer layer comprising a self-weldable polymeric material selected from the group consisting of copolyamide and ethylene vinyl acetate copolymer; (e) an adhesive layer disposed between the first and second interior layers and comprising a chemically modified ethylene unsaturated ester copolymer; and (f) an oxygen barrier layer disposed between the second interior layer and the second outer layer and comprising a material selected from the group consisting of ethylene vinyl alcohol copolymer, vinylidene chloride copolymer and polyamide.
Claim 3
Dependent Claim
31 words
A multilayer hot blown film according to claim 1 wherein the polyamide of the second interior layer is selected from nylon 6, nylon 66, nylon 12, and blends and copolymers thereof.
Claim 4
Dependent Claim
23 words
A multilayer hot blown film according to claim 1 wherein the film is a lay-flat tubular film having its self-weldable layers laminated together.
Claim 5
Dependent Claim
16 words
A multilayer hot blown film according to claim 3 wherein the film has improved heat seals.
References Cited (Backward Citations)
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |