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US 4,775,699 AGranted
Crosslinked porous skinless particles of PVC resin
AssigneeThe B. F. Goodrich Company
InventorRoss J. Cozens
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Abstract
Porous particles of crosslinked PVC are disclosed. The particles are skinless and have a fast powder mix time. Processes to produce the novel particles are also disclosed.
Claims11
A crosslinked polyvinyl chloride resin in particulate form characterized by greater than about 90% by weight of said resin particles having the following features:
- (a) said particles are skinless as evidenced by an absence of a substantially continuous pericellular membrane;
- (b) a complex viscosity of from about 0.9.times.10.sup.5 poise to about 1000.0.times.10.sup.5 poise as measured at 210.degree. C.;
- (c) a tan .delta. of less than 1.0 as measured at 210.degree. C.;
- (d) a mercury porosity of from about 0.1 cc/g to about 0.8 cc/g;
- (e) a particle size of from about 70 microns to about 1000 microns;
- (f) a friability of less than about 2;
- (g) a powder mix time of less than about 400 seconds;
- (h) a shape factor less than about 0.85;
- and
- (i) wherein greater than about 20% of the area of the surface of said particles is PVC as measured by ESCA.
7 more elements
Dependencies are inferred from the claim text.