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US 4,391,930 AGranted
Stabilized suspension of glass bubbles in an aqueous dispersion of tetrafluoroethylene polymer
AssigneeE. I. DuPont de Nemours and Company
InventorAllan H. Olson
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Abstract
Hollow glass bubble-containing aqueous dispersions of tetrafluoroethylene polymer having good shelf life are provided, said dispersions also containing nonionic surfactant and water soluble electrolyte.
Claims8
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 more elements
Dependencies are inferred from the claim text.