US4169087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and process of preparing tetrafluoroethylene polymer aqueous dispersions
Assignee: EIDP Inc
•
Filing: 1978-01-13
•
Granted: 1979-09-25
•
Expires: 1998-01-13
Abstract
Abstract Heretofore, the only practical way known to decrease the viscosity of an ionically thickened tetrafluoroethylene polymer dispersion has been by diluting it with water. This decreases the solids level, which can have an undesirable effect on subsequent processing. It has now been discovered that if the tetrafluoroethylene polymer dispersion contains a sodium phosphate in which the ratio of Na 2 O to P 2 O 5 is between 1:1 and 3:1, the viscosity of the dispersion can be decreased by adding selected inorganic electrolytes.
Inventors
- 👤 Robert F. Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:18
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C03; C03C; C03C25/00; C03C25/10; C03C25/465; C03C25/47; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/22; C08J3/03; C08K; C08K3/00; C08K3/32; C08K5/00; C08K7/00; C08K7/02; C08K7/04; C08K7/10; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
An aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C. (c) 3-11% by weight nonionic surfactant, based on weight polymer, (D) 0.2-90 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive.
Claim 2
Dependent Claim
75 words
An aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C. (c) 3-11% by weight nonionic surfactant, based on weight polymer, (D) 0.2-90 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive.
Claim 3
Dependent Claim
13 words
The aqueous dispersion of claim 1 which additionally contains an inert filler material.
Claim 4
Dependent Claim
11 words
The aqueous dispersion of claim 1 wherein the polymer is polytetrafluoroethylene.
Claim 5
Dependent Claim
12 words
The aqueous dispersion of claim 3 which additionally contains a filler material.
Claim 6
Dependent Claim
24 words
The aqueous dispersion of claim 4 wherein the sodium phosphate has a mole ratio of Na 2 O:P 2 O 5 of about 1.15-to-1.
Claim 7
Dependent Claim
141 words
Process for reducing the viscosity of an aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer, and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-90 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive, which comprises mixing said dispersion with an inorganic electrolyte selected from the class consisting of nitrates of Group II A metals; ferrous or ferric nitrate; cobalt nitrate; nickel nitrate; aluminum nitrate; calcium, barium or strontium acetate; and barium hydroxide, in an amount sufficient to reduce the viscosity of the dispersion to a value lower than prior to said mixing.
Claim 8
Dependent Claim
141 words
Process for reducing the viscosity of an aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer, and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-90 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive, which comprises mixing said dispersion with an inorganic electrolyte selected from the class consisting of nitrates of Group II A metals; ferrous or ferric nitrate; cobalt nitrate; nickel nitrate; aluminum nitrate; calcium, barium or strontium acetate; and barium hydroxide, in an amount sufficient to reduce the viscosity of the dispersion to a value lower than prior to said mixing.
Claim 9
Dependent Claim
14 words
Process of claim 6 wherein said aqueous dispersion additionally contains an inert filler material.
Claim 10
Dependent Claim
10 words
Process of claim 7 wherein the tetrafluoroethylene polymer is polytetrafluoroethylene.
Claim 11
Dependent Claim
76 words
An aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-13 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 0:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive.
Claim 12
Dependent Claim
76 words
An aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 9 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-13 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 0:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive.
Claim 13
Dependent Claim
13 words
The aqueous dispersion of claim 9 which additionally contains an inert filler material.
Claim 14
Dependent Claim
11 words
The aqueous dispersion of claim 9 wherein the polymer is polytetrafluoroethylene.
Claim 15
Dependent Claim
12 words
The aqueous dispersion of claim 11 which additionally contains a filler material.
Claim 16
Dependent Claim
24 words
The aqueous dispersion of claim 12 wherein the sodium phosphate has a mole ratio of Na 2 O:P 2 O 5 of about 1.15-to-1.
Claim 17
Dependent Claim
141 words
Process for reducing the viscosity of an aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer, and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 10 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-13 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive, which comprises mixing said dispersion with an inorganic electrolyte selected from the class consisting of nitrates of Group II A metals; ferrous or ferric nitrate; cobalt nitrate; nickel nitrate; aluminum nitrate; calcium, barium or strontium acetate; and barium hydroxide, in an amount sufficient to reduce the viscosity of the dispersion to a value lower than prior to said mixing.
Claim 18
Dependent Claim
141 words
Process for reducing the viscosity of an aqueous dispersion consisting essentially of (A) Water, (B) 45-75% by weight tetrafluoroethylene polymer, based on weight of water, polymer, and nonionic surfactant, said polymer having a melt viscosity of at least 1×10 10 poise at 380° C., (c) 3-11% by weight nonionic surfactant, based on weight of polymer, (D) 0.2-13 g per kg of dispersion of a sodium phosphate having a mole ratio of Na 2 O:P 2 O 5 between 1.05-to-1 and 1.2-to-1 inclusive, which comprises mixing said dispersion with an inorganic electrolyte selected from the class consisting of nitrates of Group II A metals; ferrous or ferric nitrate; cobalt nitrate; nickel nitrate; aluminum nitrate; calcium, barium or strontium acetate; and barium hydroxide, in an amount sufficient to reduce the viscosity of the dispersion to a value lower than prior to said mixing.
Claim 19
Dependent Claim
14 words
Process of claim 14 wherein said aqueous dispersion additionally contains an inert filler material.
Claim 20
Dependent Claim
10 words
Process of claim 15 wherein the tetrafluoroethylene polymer is polytetrafluoroethylene.
References Cited (Backward Citations)
US3489595A
Cited
US3830770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |