Claims
- 1. A stabilized suspension of glass bubbles in an aqueous dispersion of tetrafluoroethylene polymer, which suspension comprises
- (a) water having dispersed therein 45-75% by weight, based on water, of a tetrafluoroethylene polymer having a melt viscosity of at least 1.times.10.sup.9 poises at 380.degree. C.,
- (b) 5 to 10% by weight, based on polymer, of a nonionic surfactant,
- (c) 0.1 to 0.5% by weight, based on water and polymer, of a water-soluble electrolyte, and
- (d) 2 to 8% by weight, based on polymer, of glass bubbles having a density between 0.20 and 0.40 g/ml and an average size between 20 and 130 micron,
- said dispersion having a viscosity between 135 and 300 cps at 25.degree. C.
- 2. The dispersion of claim 1 wherein the polymer concentration is 55 to 65% by wt.
- 3. The dispersion of claim 1 wherein the polymer is polytetrafluoroethylene.
- 4. The dispersion of claim 1 wherein the surfactant concentration is from 5.0 to 8.0% by weight.
- 5. The dispersion of claim 1 wherein said electrolyte is an inorganic barium salt.
- 6. The dispersion of claim 1 wherein said electrolyte is an ammonium citrate.
- 7. The dispersion of claim 1 wherein the nonionic surfactant is an ethoxylated aliphatic alcohol or ethoxylated alkyl phenol.
- 8. The dispersion of claim 1, 2, 3, 4, 5, 6 or 7 wherein the glass bubbles have a density of between about 0.36 and 0.39 g/ml.
CROSS-REFERENCE TO RELATED CASES
This application is a continuation-in-part of application Ser. No. 204,956, filed Nov. 7, 1980 now abandoned.
US Referenced Citations (2)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2315259 |
Oct 1973 |
DEX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
204956 |
Nov 1980 |
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