US3769137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing laminated film of polymeric substances
Assignee: Nitto Denko Corp
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Filing: 1971-04-26
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Granted: 1973-10-30
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Expires: 1991-04-26
Abstract
Abstract A method for preparing a laminated film of polymeric substances wherein each film layer constituting the laminate is closely surface bonded to each other, which method comprising heating, pressing and rolling between rollers a sandwich wherein both of the outer layers thereof are fluorocarbon resin films and at least one thermoplastic polymer is interposed therebetween as an inner layer or layers, said rollers being at a temperature not higher than the melting point of said fluorocarbon resin and not lower than 25*C.
Inventors
- 👤 Y Moriyama
- 👤 T Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:27
CPC Classifications
B; B32; B32B; B32B27/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/19; Y10T156/195; Y10T156/1956
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
passing said laminate through a pair of compression rollers heated to a temperature of from 25* C to the melting point of said fluorocarbon resin to simultaneously heat, compress and roll-draw said laminate thereby strongly surface-bonding said adjacent layers to each other and simultaneously reducing the thickness of both of said outer layers to a thickness equal to from 30 to 60 percent of their thicknesses prior to said rolling.
Claim 2
Dependent Claim
35 words
The method according to claim 1 further comprising after said step (2), stripping from the resulting laminate one of said outer layers of fluorocarbon resin film to provide a laminated film having heat sealing properties.
Claim 3
Dependent Claim
37 words
The method according to claim 1, wherein the heating is effected at a temperature not more than the melting point of said fluorocarbon resin constituting the outer layers and not less than the heat distortion temperature thereof.
Claim 4
Dependent Claim
46 words
The method according to claim 1, wherein the heating is effected at a temperature not more than the melting point of said fluorocarbon resin constituting the outer layers and not less than the melting point of said film-forming thermoplastic resin constituting the inner layer or layers.
Claim 5
Dependent Claim
14 words
The method according to claim 1, wherein said fluorocarbon resin is a tetrafluoroethylene polymer.
Claim 6
Dependent Claim
17 words
The method according to claim 1, wherein said fluorocarbon resin is a copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 7
Dependent Claim
14 words
The method according to claim 1, wherein said fluorocarbon resin is a trifluoroethylene polymer.
Claim 8
Dependent Claim
15 words
The method according to claim 1, wherein said fluorocarbon resin is a vinylidene fluoride polymer.
Claim 9
Dependent Claim
27 words
The method according to claim 1, wherein the surfaces of the outer layers of the fluorocarbon resin films adjacent to said inner layer or layers are adhesion-treated.
Claim 10
Dependent Claim
31 words
The method according to claim 9 wherein said adhesion treatment comprises treating said surfaces with a solution of a sodium naphthalene-tetrahydrofuran complex in tetrahydrofuran or with a solution of sodium-liquid ammonia.
Claim 11
Dependent Claim
44 words
The method according to claim 1 wherein said film-forming thermoplastic resin is selected from the group consisting of polypropylene, polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, polyvinyl alcohol, vinyl acetate-ethylene copolymers, acrylic acid-acrylic acid ester copolymers, polyesters, polyamideimides, polyimides, polysulfones, polyphenylene oxides and mixtures thereof.
Claim 12
Dependent Claim
21 words
The method according to claim 1, wherein said film-forming thermoplastic resiN of the inner layer or layers is a fluorocarbon resin.
Claim 13
Dependent Claim
20 words
The method according to claim 1, wherein said film-forming thermoplastic resin of the inner layer or layers is a polyethylene.
Claim 14
Dependent Claim
20 words
The method according to claim 1, wherein said film-forming thermoplastic resin of the inner layer or layers is a polycarbonate.
Claim 15
Dependent Claim
21 words
The method according to claim 1, wherein said film-forming thermoplastic resin of the inner layer or layers is a tetrafluoroethylene polymer.
Claim 16
Dependent Claim
20 words
The method according to claim 1, wherein said film-forming thermoplastic resin of the inner layer or layers is a polyamide.
Claim 17
Dependent Claim
20 words
The method according to claim 1, wherein said film-forming thermoplastic resin of the inner layer or layers is a diacetylcellulose.
Claim 18
Dependent Claim
39 words
The method according to claim 1, wherein said film-forming thermoplastic resin is obtained by cross-linking a polyethylene containing from 0 to 100 wt percent of chlorinated polyethylene with a chlorine content of not more than 50 percent by weight.
Claim 19
Dependent Claim
19 words
The method according to claim 18, wherein said crosslinked polyethylene has a gel fraction not more than 90 percent.
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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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |