Patent US3896071A successfully refreshed from Google Patents.
US3896071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage stable aqueous dispersion of tetrafluorethylene polymer
Assignee: EIDP Inc
•
Filing: 1974-07-10
•
Granted: 1975-07-22
•
Expires: 1994-07-10
Abstract
Abstract Aqueous dispersion of tetrafluoroethylene polymer is made storage stable by adding to the dispersion a moderate amount of nonionic surfactant, e.g., from about 1 to 6% by weight thereof, and about 1 to 6% by weight of an essentially hydrophilic water soluble alkylene oxide polymer such as polyethylene glycol. The resultant dispersion is useful as a coating composition, for example to coat glass fabric, with a minimal loss of tetrafluoroethylene polymer by settling in the dispersion during storage of the dispersion prior to coating.
Inventors
- 👤 Robert Victor Poirier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:57
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/24; C03C25/26; C03C25/28; C03C25/30; C03C25/305; C08; C08K; C08K5/00; C08K5/04; C08K5/06; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L71/00; C08L71/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
AN AQUEOUS DISPRSION CONSISTING ESSENTIALLY OF WATER, TETRAFLUOROETHYLENE POLYMER PARTICLES WHEREIN THE POLYMER IS TETRAFLUOROETHYLENE HOMOPOLYMER OR A COPOLYMER OF TETRAFLUOROETHYLENE WITH UP TO 35% BY WEIGHT BASED ON EIGHT OF COPOLYMER OF ANOTHER COPOLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER, A NONIONIC SURFACTANT DISSOLVED IN SAID WATER, PRESENT IN AN AMOUNT OF ABOUT 1 TO 6 % BY EIGHT BASED ON WEIGHT OF TETRAFLUOROETHYLENE POLYMER, AND AN SSENTIALLY HYDROPHILIC ALKYLENE OXIDE POLYMER HAVING A MOLECULAR EIGHT OF AT LEAST 5000 DISSOLVED IN SAID WATER, SAID ALKYLENE OXIDE POLYMER BEING PRESENT IN AN AMOUNT OF BETWEEN ABOUT 1 TO 6 % BY WEIGHT BASED ON WEIGHT OF TETRAFLUOROETHYLENE POLYMER.
Claim 2
Dependent Claim
106 words
AN AQUEOUS DISPRSION CONSISTING ESSENTIALLY OF WATER, TETRAFLUOROETHYLENE POLYMER PARTICLES WHEREIN THE POLYMER IS TETRAFLUOROETHYLENE HOMOPOLYMER OR A COPOLYMER OF TETRAFLUOROETHYLENE WITH UP TO 35% BY WEIGHT BASED ON EIGHT OF COPOLYMER OF ANOTHER COPOLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER, A NONIONIC SURFACTANT DISSOLVED IN SAID WATER, PRESENT IN AN AMOUNT OF ABOUT 1 TO 6 % BY EIGHT BASED ON WEIGHT OF TETRAFLUOROETHYLENE POLYMER, AND AN SSENTIALLY HYDROPHILIC ALKYLENE OXIDE POLYMER HAVING A MOLECULAR EIGHT OF AT LEAST 5000 DISSOLVED IN SAID WATER, SAID ALKYLENE OXIDE POLYMER BEING PRESENT IN AN AMOUNT OF BETWEEN ABOUT 1 TO 6 % BY WEIGHT BASED ON WEIGHT OF TETRAFLUOROETHYLENE POLYMER.
Claim 3
Dependent Claim
13 words
The composition of claim 1 wherein the alkylene oxide polymer is polyethylene glycol.
Claim 4
Dependent Claim
11 words
The composition of claim 1 wherein the tetrafluoroethylene polymer is polytetrafluoroethylene.
Claim 5
Dependent Claim
30 words
The composition of claim 1 wherein the tetrafluoroethylene polymer particles are present in an amount of between about 55 and 65 % by weight based on weight of said dispersion.
References Cited (Backward Citations)
US2937156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |