Methods of making dispersible additives for polymeric materials
US5955516A · kind A · utility
6Cited by
44References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2927
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Additives for polymeric compositions are prepared by coating pigment with a dispersant, and thereafter dispersing the dispersant-coated pigment in a liquid nonaqeous polymeric carrier. Preferably, the dispersant-coated pigment is spray-dried. That is, most preferably, an aqueous dispersion of the pigment and dispersant is subjected to a spray-drying operation so as to obtain pigment coated with the dispersant. The dispersant-coated pigment will have an average particle size of about 5 .mu.m or greater, but is capable of breaking apart to average particle sizes of about 1 .mu.m or less when dispersed in a polymeric host material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.