US4076895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent multi-layered film and processes therefor
Assignee: Primerica Inc
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Filing: 1976-05-05
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Granted: 1978-02-28
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Expires: 1996-05-05
Abstract
Abstract A process is provided for imparting transparency to a multi-layered polymeric film comprising passing a continuous polymeric web into the nip formed by a pair of counter-rotating rolls, one of said rolls being a pressure roll and the other, a chill roll having a matte surface; extruding a molten polymeric film into the nip between said polymeric web and said chill roll to form a multi-layered film, while maintaining an inert liquid on at least that portion of the chill roll which contacts said extruded film.
Inventors
- 👤 Mark Henry Theno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:19
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/0038; B29; B29C; B29C43/00; B29C43/22; B29C43/222; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/9175; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B38/00; B32B38/0008; B32B2307/00; B32B2307/40; B32B2307/412; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31938
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
Process for imparting transparency to a multi-layered polymeric film comprising passing a continuous polymeric web into the nip formed by a pair of counter-rotating rolls, one of said rolls being a pressure roll and the other, a chill roll having a matte surface; extruding a molten polymeric film into the nip between said polymeric web and said chill roll to form a multi-layered film, while maintaining an inert liquid film on at least that portion of the chill roll which contacts said extruded film.
Claim 2
Dependent Claim
84 words
Process for imparting transparency to a multi-layered polymeric film comprising passing a continuous polymeric web into the nip formed by a pair of counter-rotating rolls, one of said rolls being a pressure roll and the other, a chill roll having a matte surface; extruding a molten polymeric film into the nip between said polymeric web and said chill roll to form a multi-layered film, while maintaining an inert liquid film on at least that portion of the chill roll which contacts said extruded film.
Claim 3
Dependent Claim
15 words
Process as defined in claim 1 wherein the pressure roll includes a poly(tetrafluoroethylene) coating thereon.
Claim 4
Dependent Claim
12 words
Process as defined in claim 1 wherein the inert liquid is water.
Claim 5
Dependent Claim
13 words
Process as defined in claim 1 wherein the inert liquid is an alcohol.
Claim 6
Dependent Claim
18 words
Process as defined in claim 1 wherein the inert liquid is an aqueous solution of sodium lauryl sulfate.
Claim 7
Dependent Claim
30 words
Process as defined in claim 1 wherein the inert liquid film is maintained on the chill roll by spraying water onto the chill roll in the region of the nip.
Claim 8
Dependent Claim
30 words
Process as defined in claim 1 wherein the inert liquid film is maintained on the chill roll by maintaining the air temperature surrounding the chill roll below the dew point.
Claim 9
Dependent Claim
14 words
Process as defined in claim 1 wherein the continuous polymeric web comprises polypropylene film.
Claim 10
Dependent Claim
17 words
Process as defined in claim 8 wherein the molten polymeric film is formed from an ionomer resin.
References Cited (Backward Citations)
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US3075868A
Cited
US2955970A
Cited
US2989414A
Cited
US3194677A
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |