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US 3,942,903 AGranted
Unitary porous themoplastic writing nib
AssigneeGlasrock Products, Inc.
InventorsClarence A. Dickey, John E. McDaniel
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Abstract
A process is provided to form spherical thermoplastic particles that involves dispersing a thermoplastic powder in a liquid that is a partial solvent for the thermoplastic, breaking the dispersion into droplets, forming thermoplastic spheres by heating the droplets to a temperature sufficient to at least partially solubilize the thermoplastic and to evaporate the solvent. Unique products, including porous structures, may be produced from material formed by this process.
Claims4
A unitary porous thermoplastic polymer product formed by:
- dispersing thermoplastic polymer particles in a partial solvent for said thermoplastic polymer;
- atomizing the dispersion at an elevated temperature sufficient to at least partially solubilize said thermoplastic polymer, to vaporize said partial solvent and to cause said particles to adhere and melt together thus forming fully-densified microspheres of the thermoplastic polymer;
- and
- sintering said thermoplastic polymer microspheres to form the porous product.
1 more element
Dependencies are inferred from the claim text.