US3741253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminates of ethylene vinyl acetate polymers and polymers of vinylidene chloride
Assignee: WR Grace and Co Conn
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Filing: 1971-03-30
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Granted: 1973-06-26
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Expires: 1991-03-30
Abstract
Abstract A multiply laminate useful as a packaging film having a first layer of a cross linked ethylene vinyl acetate polymer, a directly joined middle layer of a polymer of vinylidene chloride and a third layer directly joined to the middle layer of an ethylene/vinyl acetate polymer. Especially preferred for the middle layer are blends of emulsion polymerized and suspension polymerized vinylidene chloride and an epoxy resin.
Inventors
- 👤 Harri Jouna Brax
- 👤 Joseph Frederick Porinchak
- 👤 Alan Stuart Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:58
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/048; B; B29; B29C; B29C48/00; B29C48/001; B29C48/0013; B29C48/0015; B29C48/0016; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; B32B27/32; C08J7/042; C08J7/043; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; B29C48/10; B32B38/00; B32B38/0012; B32B2038/0028; B32B2270/00; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/732; B32B2307/734; B32B2307/736; B32B2310/00; B32B2310/08; B32B2310/0875; B32B2439/00; B32B2439/70; B32B2597/00; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08J2427/00; C08J2427/02; C08J2427/04; C08J2427/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
34 words
The laminate of claim 1 wherein said second ply comprises a blend of 5 to 40 percent by weight of suspension polymerized polymer and 60 to 95 percent by weight of emulsion polymerized polymer.
Claim 2
Dependent Claim
56 words
4 to 6 percent by weight based on the blend weight of an epichlorohydrin/bisphenol A epoxy resin, and C. An outer third ply directly joined to said second ply having a thickness of 0.25 to 1.0 mils and comprising a copolymer of ethylene and vinyl acetate having 5 to 20 percent by weight of vinyl acetate.
Claim 3
Dependent Claim
37 words
The laminate of claim 1 wherein said second ply comprises a blend of a polymer of vinylidene chloride and vinyl chloride and 2 to 10 percent by weight based on the blend weight of an epoxy resin.
Claim 4
Dependent Claim
124 words
A tubular thermoplastic multiply laminate suitable for packaging which has been biaxially oriented to provide a shrink tension of 200 to 400 psi and a free shrink of at least 40 percent at 205*F and which has an oxygen transmission rate of no more than 70 cc (m2/24hr/1 atmosphere) at 73*F, said laminate comprising A. An inner first ply having a thickness of 1 to 2 mils and comprising an irradiated copolymer of ethylene and vinyl acetate having 5 to 20 percent by weight of vinyl acetate, said first ply having been irradiated to a dosage of 2 to 15 megarads, and B. A second ply directly joined to said first ply having a thickness of 0.1 to 0.5 mils comprising a blend of
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |