Claims
- 1. An aqueous dispersion comprising:
- (a) water;
- (b) colloidal particles of a copolymer of units of tetrafluoroethylene and at least one other fluorinated monomer;
- (c) 0.1 to 40% by weight of dispersion of a liquid perfluorinated hydrocarbon having a molecular weight below 500, and being selected from the class consisting of
- (i) perfluorinated aromatic compounds; and
- (ii) perfluorinated heterocyclic aliphatic compounds that contain oxygen or sulfur in the ring;
- and wherein the particles have an average size between 1 and 80 nanometers.
- 2. The aqueous dispersion of claim 1 wherein the perfluorinated hydrocarbon is a perfluorinated heterocyclic aliphatic compound that contains oxygen or sulfur in the ring.
- 3. The aqueous dispersion of claim 2 wherein the heterocyclic aliphatic compound is perfluoro-2-butyl tetrahydrofuran.
- 4. The aqueous dispersion of claim 1 wherein other the fluorinated monomer is hexafluoropropylene.
- 5. The aqueous dispersion of claim 1 wherein the particles have an average particle size between 1 and 50 nanometers.
- 6. The aqueous dispersion of claim 2 wherein the particles have an average particle size between 1 and 50 nanometers.
- 7. The aqueous dispersion of claim 1 wherein the particles have an average particle size between 1 and 30 nanometers.
- 8. The aqueous dispersion of claim 2 wherein the particles have an average particle size between 1 and 30 nanometers.
Parent Case Info
This application is a division of application Ser. No. 08/374,007, filed Jan. 18, 1995, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
248446 |
Dec 1987 |
EPX |
0612770 |
Feb 1993 |
EPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
374007 |
Jan 1995 |
|