US4022646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of co-oriented laminated ethylene polymer films
Assignee: DuPont Canada Inc
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Filing: 1974-02-25
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Granted: 1977-05-10
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Expires: 1994-02-25
Abstract
Abstract A process is disclosed for the co-orientation lamination of at least one ethylene polymer film (A) with at least one ethylene polymer film (B). The polymer of film (A) is of higher melting point than the polymer of film (B). The preferred ethylene polymers are ethylene homopolymers and ethylene-butene-l copolymers. The laminates produced may be heat sealed.
Inventors
- 👤 Kenneth Casey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:05
CPC Classifications
B; B32; B32B; B32B7/00; B32B7/02; B32B7/027; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C55/00; B29C55/02; B29C55/023; B32B27/32; B32B37/00; B32B37/04; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2309/00; B32B2309/14; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/046; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/24992; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A process for the manufacture of a co-orientation laminated ethylene polymer film laminate from separate films comprising the steps (1) bringing together in face to face engagement at least one ethylene polymer film (A) of a density in the range of about 0.950 to about 0.960 with at least one separate ethylene polymer film (B) of a density in the range of about 0.910 to about 0.945, the polymer of film (A) being of a higher melting point than the polymer of film (B), and (2) essentially simultaneously orienting and laminating said engaged films at a temperature below the melting point of the polymer of film (A) by means of contact with a first roll and subsequently with a second roll, the temperature of the first roll being higher than the temperature of the second roll, with film (A) being in contact with said first roll.
Claim 2
Dependent Claim
146 words
A process for the manufacture of a co-orientation laminated ethylene polymer film laminate from separate films comprising the steps (1) bringing together in face to face engagement at least one ethylene polymer film (A) of a density in the range of about 0.950 to about 0.960 with at least one separate ethylene polymer film (B) of a density in the range of about 0.910 to about 0.945, the polymer of film (A) being of a higher melting point than the polymer of film (B), and (2) essentially simultaneously orienting and laminating said engaged films at a temperature below the melting point of the polymer of film (A) by means of contact with a first roll and subsequently with a second roll, the temperature of the first roll being higher than the temperature of the second roll, with film (A) being in contact with said first roll.
Claim 3
Dependent Claim
26 words
The process of claim 1 in which the surface speed of the second roll is at least 1.5 times the surface speed of the first roll.
Claim 4
Dependent Claim
25 words
The process of claim 2 in which the distance between the first roll and the second roll is in the range 0.005 to 1.0 inches.
Claim 5
Dependent Claim
38 words
The process of claim 3 in which the polymer of film (B) is of melt index in the range of about 0.1 to about 10 and is selected from the group consisting of ethylene homopolymers and ethylene-butene-1 copolymers.
Claim 6
Dependent Claim
27 words
The process of claim 4 in which the polymer of film (A) is an ethylene homopolymer of melt index in the range about 0.1 to about 10.
Claim 7
Dependent Claim
26 words
The process of claim 2, in which the surface speed of the second roll is 3.0 to 7.0 times the surface speed of the first roll.
Claim 8
Dependent Claim
20 words
The process of claim 1, in which there is one ethylene polymer film (A) and one ethylene polymer film (B).
Claim 9
Dependent Claim
26 words
The process of claim 1, in which there is one ethylene polymer film (B) and not more than two ethylene polymer films (A) in alternate arrangement.
Claim 10
Dependent Claim
23 words
The process of claim 1, in which the gauge of film (B) is not more than 25% of the gauge of film (A).
References Cited (Backward Citations)
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Cited
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |