Patent US2968381A successfully refreshed from Google Patents.
Patent US4432820A successfully refreshed from Google Patents.
US4432820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polyester-polyolefin film laminates
Assignee: Champion International Corp
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Filing: 1983-03-14
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Granted: 1984-02-21
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Expires: 2003-03-14
Abstract
Abstract A process for the production of a permanently bonded polyester-polyolefin film laminate is disclosed herein. The process involves exposing the surface of polyester or polyolefin film to contact with a flame so as to prime the surface thereof and thereafter coating the primed surface of the film with a layer of a molten polyolefin or polyester, respectively. Flame priming of the polyester or polyolefin film results in a permanent surface modification of the film. Thus, the time lapse between the priming of the polyester or polyolefin film and the subsequent coating with the molten polymer may be a matter of days, if desired. Multi-layer laminates which comprise a substrate-polyester-polyolefin laminate, e.g., paperboard-polyester-polyolefin laminates, can be provided by the process of the present invention by providing a previously formed laminate of a substrate and a polyester film and flame priming the polyester surface of the laminate. Thereafter, a layer of a molten polyolefin is coated onto the primed polyester surface.
Inventors
- 👤 Kenneth P. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:36
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/0036; B05; B05D; B05D3/00; B05D3/08; B29; B29C; B29C59/00; B29C59/08; B32B27/00; B32B27/06; B32B27/08; B32B27/10; B32B27/32; B05D2201/00; B32B2310/00; B32B2310/04; B32B2310/0445; B32B2367/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A process for producing a permanently bonded laminate comprising polyester and polyolefin layers which consists essentially of: (A) providing a preformed polyester or a heat-sealable polyolefin film; (B) contacting a surface of said film with the secondary portion of a flame in the vicinity of the termination of the primary portion of the flame, said flame being produced from a combustible hydrocarbon-oxygen mixture and having a temperature in the range of about 1700° F. to about 1900° F., so as to prime the surface of the film; (C) storing the primed film; and (D) coating the stored film with a layer of molten polymer, said molten polymer being a heat-sealable polyolefin when the film is a polyester film and a polyester when the film is a polyolefin.
Claim 2
Dependent Claim
127 words
A process for producing a permanently bonded laminate comprising polyester and polyolefin layers which consists essentially of: (A) providing a preformed polyester or a heat-sealable polyolefin film; (B) contacting a surface of said film with the secondary portion of a flame in the vicinity of the termination of the primary portion of the flame, said flame being produced from a combustible hydrocarbon-oxygen mixture and having a temperature in the range of about 1700° F. to about 1900° F., so as to prime the surface of the film; (C) storing the primed film; and (D) coating the stored film with a layer of molten polymer, said molten polymer being a heat-sealable polyolefin when the film is a polyester film and a polyester when the film is a polyolefin.
Claim 3
Dependent Claim
12 words
The process of claim 1, wherein said film is a polyester film.
Claim 4
Dependent Claim
11 words
The process of claim 2, wherein said polyester is polyethylene terephthalate.
Claim 5
Dependent Claim
11 words
The process of claim 3, wherein said molten polyolefin comprises polyethylene.
Claim 6
Dependent Claim
15 words
The process of claim 2, wherein the polyester film is a lamina of paperboard-polyester laminate.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein said polyolefin comprises polypropylene.
Claim 8
Dependent Claim
141 words
A process for producing a permanently bonded laminate comprising polyester and polyolefin layers which consists essentially of: (A) providing a preformed polyester film; (B) contacting a surface of said film with the secondary portion of a flame in the vicinity of the termination of the primary portion of the flame, said flame being produced from a combustible hydrocarbon-oxygen mixture and having a temperature in the range of about 1700° F. to about 1900° F., at least for a time sufficient to prime said surface of the film but for a time less than that which will cause substantial deformation of the film, whereby said film need not be in contact with a cooling roller when contacted by the flame; and (C) coating the primed surface of the film with a layer of molten polymer, said molten polymer being a heat-sealable polyolefin.
Claim 9
Dependent Claim
141 words
A process for producing a permanently bonded laminate comprising polyester and polyolefin layers which consists essentially of: (A) providing a preformed polyester film; (B) contacting a surface of said film with the secondary portion of a flame in the vicinity of the termination of the primary portion of the flame, said flame being produced from a combustible hydrocarbon-oxygen mixture and having a temperature in the range of about 1700° F. to about 1900° F., at least for a time sufficient to prime said surface of the film but for a time less than that which will cause substantial deformation of the film, whereby said film need not be in contact with a cooling roller when contacted by the flame; and (C) coating the primed surface of the film with a layer of molten polymer, said molten polymer being a heat-sealable polyolefin.
Claim 10
Dependent Claim
22 words
The process of claim 7 wherein the film is passed over the flame at a speed of about 800 feet per minute.
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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) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |