Claims
- 1. A porous polyvinyl chloride resin in particulate form characterized by greater than about 90% by weight of said resin particles have an agglomerated non-spherical shape having a shape factor less than about 0.85, and wherein said particles are absent a substantially continuous pericellular membrane and wherein said resin has a mercury porosity of from about 0.1 cc/g to about 0.7 cc/g, and a particle size of from about 70 microns to about 1000 microns, and a friability of less than about 2, and a powder mix time of less than about 400 seconds, and wherein greater than about 20% of the area of the surface of said particle is PVC as measured by ESCA.
- 2. A resin of claim 1 wherein said resin is a PVC homopolymer.
- 3. A resin of claim 2 wherein said resin particles are characterized by having:
- (a) a shape factor less than about 0.83;
- (b) a mercury porosity of from about 0.3 cc/g to about 0.5 cc/g;
- (c) a particle size of from about 100 microns to about 250 microns;
- (d) a friability of less than about 1;
- (e) a powder mix time less than about 300 seconds; and
- (f) greater than about 50% of the surface area of said particle is PVC.
- 4. A resin of claim 3 wherein said shape factor is less than about 0.80.
- 5. A resin of claim 3 wherein said friability is about 0.
- 6. A resin of claim 3 wherein said powder mix time is less than about 250 seconds.
- 7. A resin of claim 3 wherein greater than about 60% of the surface area of said particles is PVC.
Parent Case Info
This is a division, of application Ser. No. 038,099, filed Apr. 14, 1987 U.S. Pat. No. 4,711,908, Dec. 8, 1987.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
38099 |
Apr 1987 |
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