US3904575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorocarbon polymer composition and production and use thereof
Assignee: Daikin Industries Ltd
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Filing: 1973-05-31
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Granted: 1975-09-09
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Expires: 1993-05-31
Abstract
Abstract A stable, substantially anhydrous organosol of tetrafluoroethylene polymer and tetrafluoroethylenehexafluoropropylene copolymer prepared by evaporating a mixture of an aqueous dispersion of tetrafluoroethylene polymer having a particle size of about 0.05 to 0.5 micron, an average particle size of about 0.1 to 0.3 micron and a standard specific gravity of about 2.20 to 2.29 and an aqueous dispersion of tetrafluoroethylene-hexafluoropropylene copolymer having a particle size of about 0.01 to 0.3 micron, an average particle size of about 0.05 to 0.2 micron, a specific melt viscosity at 380*C of about 1 X 103 to 106 poise and a ratio by weight of tetrafluoroethylene:hexafluoropropylene of about 95/5 to 5/95 in the presence of an organic solvent which is insoluble or hardly soluble in water, forms an azeotropic mixture with water and does not interfere chemically or physically with the polymers so as to remove water azeotropically from the system, if necessary, followed by minimizing the particles of the polymers. The organosol is admixed with a film-forming material to make a composition for coating, which is applicable on a metal plate to form a film of excellent properties such as adhesiveness, hardness, self lubricating, anti-sticking and wear resistant properties.
Inventors
- 👤 Takaomi Satokawa
- 👤 Tuneo Fujii
- 👤 Norimasa Honda
- 👤 Kozo Asano
- 👤 Yukiharu Nakamura
- 👤 Seisuke Suzue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:44
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
85 words
A STABLE, SUBSTANTIALLY ANHYDROUS ORGANOSOL CONSISTING ESSENTIALLY OF ABOUT 5 TO 40% BY WEIGHT OF PARTICLES OF POLYTETRAFLUOROETHYLENE AND PARTICLES OF TETRAFLUOROETHYLENE-HEXAFLUOROETHYLENE COPOLYMER DISPERSED IN AN ORGANIC SOLVENT WHICH IS INSOLUBLE OR HARDLY SOLUBLE IN WATER, FORMS AN AZEOTROPIC MIXTURE WITH WATER AND DOES NOT INTERFER CHEMICALLY OR PHYSICALLY WITH THE POLYTETRAFLUOROETHYLENE AND THE COPOLYMER, THE WEIGHT RATIO OF THE POLYTETRAFLUOROETHYLENE TO THE COPOLYMER BEING FROM 5:95 TO 50:60 AND THE PARTICLE SIZE OF SAID POLYTETRAFLUOROETHYLENE AND THE COPOLMER BEING ABOUT 0.01 TO 3 MICRONS.
Claim 2
Dependent Claim
85 words
A STABLE, SUBSTANTIALLY ANHYDROUS ORGANOSOL CONSISTING ESSENTIALLY OF ABOUT 5 TO 40% BY WEIGHT OF PARTICLES OF POLYTETRAFLUOROETHYLENE AND PARTICLES OF TETRAFLUOROETHYLENE-HEXAFLUOROETHYLENE COPOLYMER DISPERSED IN AN ORGANIC SOLVENT WHICH IS INSOLUBLE OR HARDLY SOLUBLE IN WATER, FORMS AN AZEOTROPIC MIXTURE WITH WATER AND DOES NOT INTERFER CHEMICALLY OR PHYSICALLY WITH THE POLYTETRAFLUOROETHYLENE AND THE COPOLYMER, THE WEIGHT RATIO OF THE POLYTETRAFLUOROETHYLENE TO THE COPOLYMER BEING FROM 5:95 TO 50:60 AND THE PARTICLE SIZE OF SAID POLYTETRAFLUOROETHYLENE AND THE COPOLMER BEING ABOUT 0.01 TO 3 MICRONS.
Claim 3
Dependent Claim
21 words
The organosol according to claim 1, wherein the ratio of tetrafluoroethylene to hexafluoropropylene in the copolymer is about 95/5 to 5/95.
Claim 4
Dependent Claim
17 words
The organosol according to claim 1, having a water content therein of less than 0.1% by weight.
Claim 5
Dependent Claim
17 words
The organosol according to claim 1, having a water content therein of less than 0.05% by weight.
Claim 6
Dependent Claim
23 words
The organosol according to claim 1, which contains 20 to 30% by weight of the particles of polytetrafluorethylene and particles of tetrafluoroethylene-hexafluoropropylene copolymer.
Claim 7
Dependent Claim
21 words
The organosol according to claim 1, wherein the organic solvent is selected from the group consisting of aromatic hydrocarbons and ketones.
Claim 8
Dependent Claim
21 words
The organosol according to claim 2, wherein the ratio of tetrafluoroethylene to hexafluoropropylene in the copolymer is from 90/10 to 50/50.
Claim 9
Dependent Claim
21 words
The organosol according to claim 2, wherein the ratio of tetrafluoroethylene to hexafluoropropylene in the copolymer is from 90/10 to 70/30.
Claim 10
Dependent Claim
16 words
The organosol according to claim 5, wherein the particle size ranges from 0.01 to 2 microns.
Claim 11
Dependent Claim
21 words
The organosol according to claim 6, wherein the solvent is selected from the group consisting of benzene, toluene, methylisobutylketone and diisobutylketone.
Claim 12
Dependent Claim
30 words
The organosol according to claim 1, wherein the content of the particles of polytetrafluoroethylene is not more than about 30% by weight on the basis of the whole polymer particles.
Claim 13
Dependent Claim
14 words
The organosol according to claim 1, wherein the organic solvent is toluene or methylisobutylketone.
Claim 14
Dependent Claim
27 words
A composition for coating which comprises the organosol according to claim 1 and a film-forming material incorporated therewith in a proportion of 95:5 to 10:90 by weight.
Claim 15
Dependent Claim
22 words
A composition for coating according to claim 13, wherein the proportion of the organosol to film-forming material is from 70/30 to 30/70.
Claim 16
Dependent Claim
122 words
A process for preparing the organosol according to claim 1, which comprises evaporating a mixture of an aqueous dispersion of polytetrafluoroethylene having a particle size of about 0.05 to 0.5 micron, an average particle size of about 0.1 to 0.3 micron and a standard specific gravity of about 2.20 to 2.29 and an aqueous dispersion of tetrafluoroethylenehexafluoropropylene copolymer having a particle size of about 0.01 to 0.03 micron, an average particle size of about 0.05 to 0.2 micron, a specific melt viscosity at 380*C. of about 1 X 103 to 106 poise and a ratio by weight of tetrafluoroethylene: hexafluoropropylene of about 95/5 to 5/95 in the presence of the said organic solvent so as to remove water azeotroPically from the system.
Claim 17
Dependent Claim
16 words
The composition of claim 13, wherein said film-forming material is a polymer having a film-forming property.
Claim 18
Dependent Claim
46 words
The composition of claim 16, wherein said film-forming polymer includes thermoplastic and thermosetting polymers and heat-resistance polymer which does not decompose at a temperature higher than the melting point of a mixture of the polytetrafluorethylene and the tetrafluoroethylene-hexafluoropropylene copolymer or a precursor of said heat-resistant polymer.
Claim 19
Dependent Claim
49 words
The composition of claim 17, wherein said thermoplastic and thermosetting polymers include nitrocellulose, cellulose acetate tutyrate, alkyd resin, polyester, polyurethane, phenol-formaldehyde resin, ureaformaldehyde resin, melamine-formaldehyde resin, epoxy resin, polychlorotrifluoroethylene, polyvinylidene fluoride and polyvinyl fluoride and said heat-resistant polymer or precursor thereof includes polyimide, polyamide, polyamidoimide, polyoxadiazole, polybenzimidazole, and polysiloxane.
Claim 20
Dependent Claim
88 words
A stable, substantially anhydrous organosol consisting of about 5 to 40% by weight of particles of polytetrafluoroethylene and particles of tetrafluoroethylene-hexafluoropropylene copolymer dispersed in an organic solvent which is insoluble or hardly soluble in water, forms an azeotropic mixture with water and does not interfere chemically or physically with the polytetrafluoroethylene and the copolymer, the weight ratio of the polytetrafluoroethylene to the copolymer being from 5 : 95 to 40 : 60 and the particle size of said polytetrafluoroethylene and the copolymer being about 0.01 to 3 microns.
Claim 21
Dependent Claim
88 words
A stable, substantially anhydrous organosol consisting of about 5 to 40% by weight of particles of polytetrafluoroethylene and particles of tetrafluoroethylene-hexafluoropropylene copolymer dispersed in an organic solvent which is insoluble or hardly soluble in water, forms an azeotropic mixture with water and does not interfere chemically or physically with the polytetrafluoroethylene and the copolymer, the weight ratio of the polytetrafluoroethylene to the copolymer being from 5 : 95 to 40 : 60 and the particle size of said polytetrafluoroethylene and the copolymer being about 0.01 to 3 microns.
Claim 22
Dependent Claim
84 words
A stable, substantially anhydrous organosol consisting essentially of about 5 to 40% by weight of particles of polytetrafluoroethylene and particles of tetrafluoroethylene-hexafluoropropylene copolymer dispersed in an organic solvent which is insoluble or hardly soluble in water, forms an azeotropic mixture with water and does not interfere chemically or physically with the polytetrafluoroethylene and the copolymer, the weight ratio of the polytetrafluoroethylene to the copolymer being 3 : 7 and the particle size of said polytetrafluoroethylene and the copolymer being about 0.01 to 3 microns.
Claim 23
Dependent Claim
84 words
A stable, substantially anhydrous organosol consisting essentially of about 5 to 40% by weight of particles of polytetrafluoroethylene and particles of tetrafluoroethylene-hexafluoropropylene copolymer dispersed in an organic solvent which is insoluble or hardly soluble in water, forms an azeotropic mixture with water and does not interfere chemically or physically with the polytetrafluoroethylene and the copolymer, the weight ratio of the polytetrafluoroethylene to the copolymer being 3 : 7 and the particle size of said polytetrafluoroethylene and the copolymer being about 0.01 to 3 microns.
Claim 24
Dependent Claim
22 words
The organosol according to claim 20, which contains 25% by weight of the particles of tetrafluoroethylene polymer and particles of tetrafluoroethylene-hexafluoropropylene copolymer.
Claim 25
Dependent Claim
22 words
The process according to claim 15, which is followed by minimizing the particles of the polymers at a temperature below about 30*C.
Claim 26
Dependent Claim
21 words
The process according to claim 22, wherein the particles are minimized by a ball mill for 30 minutes to 72 hours.
Claim 27
Dependent Claim
32 words
A process for preparing the composition according to claim 13, which comprises admixing the organosol according to claim 1 with a film-forming material in a proportion of 95:5 to 10:90 by weight.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |