US4883716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacture of cast fluoropolymer-containing films at high productivity
Assignee: Saint Gobain Performance Plastics Corp
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Filing: 1988-08-01
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Granted: 1989-11-28
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Expires: 2008-08-01
Abstract
Abstract A method is provided for preparation of a fluoropolymeric film on a carrier, comprising: (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering zone to remove excess dispersion; (d) drying the metered coated carrier to remove the water from the dispersion; and (e) heating the dried coated carrier to a temperature sufficient to consolidate the dispersion, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidation temperature of the dispersion and a work of adhesion between the carrier belt and the dispersion that does not exceed the yield strength of the consolidated fluoropolymeric film.
Inventors
- 👤 John A. Effenberger
- 👤 Keith G. Koerber
- 👤 Michael N. Latorra
- 👤 John V. Petriello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
C; C08; C08J; C08J5/00; B; B29; B29C; B29C41/00; B29C41/24; B29C41/28; B29C41/02; B29C41/12; B29C41/34; B29C41/46; B29K; B29K2027/00; B29K2027/12; B29L; B29L2007/00; B29L2007/008; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A fluoropolymeric film comprising at least one fluoropolymer-containing layer formed by (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering device to remove excess dispersion; (d) drying the metered coated carrier belt to remove the water from the dispersion; (e) heating the dried coated carrier belt to a temperature sufficient to consolidate the dispersion; (f) cooling the consolidated coated carrier belt; and (g) stripping the consolidated fluoropolymeric film from the carrier belt, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidiation temperature of the dispersion and a work of adhesion that does not exceed the yield strength of the consolidated fluoroplymeric film.
Claim 2
Dependent Claim
143 words
A fluoropolymeric film comprising at least one fluoropolymer-containing layer formed by (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering device to remove excess dispersion; (d) drying the metered coated carrier belt to remove the water from the dispersion; (e) heating the dried coated carrier belt to a temperature sufficient to consolidate the dispersion; (f) cooling the consolidated coated carrier belt; and (g) stripping the consolidated fluoropolymeric film from the carrier belt, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidiation temperature of the dispersion and a work of adhesion that does not exceed the yield strength of the consolidated fluoroplymeric film.
Claim 3
Dependent Claim
35 words
A fluoropolymeric film according to claim 1, wherein the fluoropolymer is selected from the group consisting of fluorine-containing homopolymers, copolymers and terpolymers of tetrahaloethylenes, vinyl fluoride, vinylidene fluoride, hexafluoropropylene, perfluoroalkyl vinyl ethers, ethylene and propylene.
Claim 4
Dependent Claim
35 words
A fluoropolymeric film according to claim 1, wherein the film comprises a plurality of fluoropolymer-containing layers formed by successively repeating steps (a) through (f) and then stripping the consolidated multilayer film from the carrier belt.
Claim 5
Independent Claim
125 words
A method for preparation of a fluoropolymeric film on a carier, comprising: (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering device to remove excess dispersion; (d) drying the metered coated carrier to remove the water from the dispersion; and (e) heating the dried coated carrier to a temperature sufficient to consolidate the dispersion, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidation temperature of the dispersion and a work of adhesion that does not exceed the yield strength of the consolidated fluoropolymeric film.
Claim 6
Independent Claim
125 words
A method for preparation of a fluoropolymeric film on a carier, comprising: (a) preparing an aqueous dispersion comprising a fluoropolymer; (b) dipping a carrier belt through the dispersion such that a coating of the dispersion is formed on the carrier belt; (c) passing the coated carrier belt through a metering device to remove excess dispersion; (d) drying the metered coated carrier to remove the water from the dispersion; and (e) heating the dried coated carrier to a temperature sufficient to consolidate the dispersion, wherein the carrier belt is formed from a material of low thermal mass having chemical and dimensional stability at the consolidation temperature of the dispersion and a work of adhesion that does not exceed the yield strength of the consolidated fluoropolymeric film.
Claim 7
Dependent Claim
26 words
A method according to claim 4, wherein the carrier belt is dipped in the dispersion at a rate of at least 10 linear feet per minute.
Claim 8
Dependent Claim
15 words
A method according to claim 5, wherein the heating step takes less than 1.5 minutes.
Claim 9
Dependent Claim
29 words
A method according to claim 4, wherein the aqueous dispersion further comprises a surfactant in an amount effective to facilitate wetting of the carrier belt by the aqueous dispersion.
Claim 10
Dependent Claim
31 words
A method according to claim 7, wherein the surfactant is selected such that it is thermally or oxidatively fugitive at a temperature at or below the consolidation temperature of the dispersion.
Claim 11
Dependent Claim
19 words
A method according to claim 7, wherein the surfactant is octylphenoxy polyethoxy ethanol at a concentration of about 6%.
Claim 12
Dependent Claim
25 words
A method according to claim 7, wherein the surfactant is octylphenoxy polyethoxy ethanol at a concentration of about 6% together with a fluorinated ionic surfactant.
Claim 13
Dependent Claim
55 words
A method according to claim 4, wherein the carrier is selected from among films of high melting thermoplastics, films of thermosetting plastics, coated or laminated textiles formed from a thermally stable plastic or resin and a thermally stable reinforcement, a plastic coated metal foil and metallized or metal foil laminated thermally stable plastic or resins.
Claim 14
Dependent Claim
34 words
A method according to claim 4, wherein the fluoropolymer is selected from the group consisting of fluorine-containing homopolymers, copolymers and terpolymers of tetrahaloethylenes, vinyl fluoride, vinylidene fluoride, hexafluoropropylene, perfluoroalkyl vinyl ethers, ethylene and propylene.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |