Back to results
US 4,361,624 AGranted
Spray-dried hollow fibers
AssigneePQ Corporation
InventorBruce D. Spivack
Life of this patent
Estimating the term…
Abstract
Hollow fibers are prepared by spray drying a solution of a film-former in a volatile solvent. The viscosity of the solution must be 1.5 to 10 times the viscosity that usually results in spheres or microspheres. The preferred film-forming substance is a combination of sodium silicate and a "polysalt."
Claims4
A hollow fiber prepared by spray drying a film forming substance dissolved in a volatile solvent characterized in that the film-forming substance consists of sodium silicate and an inorganic polysalt;
- the solvent is water;
- the fibers are more than 100 microns in length, have an aspect ratio or 8 or more, a loss on ignition of 8 to 20% by weight and a true density of 0.7 to 1.1 g/ml.
Dependencies are inferred from the claim text.