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US3629037A
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US
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Process for production of laminated film having reduced neck-in-forming property
Assignee: Mitsubishi Chemical Corp
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Filing: 1968-01-31
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Granted: 1971-12-21
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Expires: 1988-01-31
Abstract
Abstract A process for the production of laminated film which comprises extruding from an extruder die a melted resin having a high neckin-forming property together with another melted resin having a lower neck-in-forming property, then laminating the extruded resin in the form of a melted compounded film with a base material.
Inventors
- 👤 Kohei Masuda
- 👤 Taku Uchigaki
- 👤 Masakazu Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:05
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/26; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The process of claim 1 wherein different thermoplastic resins are employed in the formation of said multilayer thermoplastic film.
Claim 2
Dependent Claim
32 words
The process of claim 1 wherein the same thermoplastic resin is employed in at least two of the layers of the multilayer plastic film, said layers being formed at different extrusion temperatures.
Claim 3
Dependent Claim
67 words
The process of claim 1 wherein the thermoplastic resin normally subject to neck-in formation is selected from the group consisting of polypropylene, medium-pressure polyethylene, low-pressure polyethylene, high-pressure polyethylene possessing a relatively high specific gravity, polyester and polyvinylidene chloride and the thermoplastic resin layer less subject to neck-in formation comprises a resin selected from the group consisting of high-pressure polyethylene and a copolymer of ethylene with vinyl acetate.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein simultaneous extrusion is accomplished by combining separate resin streams and extruding said combined stream from a single outlet orifice.
Claim 5
Dependent Claim
45 words
The process of claim 1 wherein simultaneous extrusion is achieved by extruding each resin stream separately from separate slits in the extrusion dye and combining said separate streams at a point immediately below the outlet orifice of each slit to form the multilayer thermoplastic film.
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |