Polymeric powders and method of preparation
US6294595A · kind A · utility
67Cited by
7References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 30, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Aug 30, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J3/14
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polymeric powders of small particle size and size distribution and of irregular morphology are prepared by a limited coalescence procedure wherein a polymer in an organic solvent is dispersed by high shear agitation in an aqueous phase containing colloidal stabilizer particles having opposite electrostatic charges. The organic solvent is evaporated and the polymer particles are recovered from the aqueous medium. The particles are of irregular shape and narrow particle size distribution and have superior electrostatic transfer properties when used as electrostatographic dry toners.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.