Method for preparing synthetic powders based on polyvinyl chloride or vinyl chloride copolymers containing emulsifiers
US3993536A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Sep 11, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S159/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The method of preparing synthetic powders containing emulsifiers having good paste qualities by spray-drying polymer dispersions through a two-fluid atomizer having a spray ratio of about 1.6 to 5.0 kg. of spray air for each kg. of dispersion is improved. The polymer dipersions are prepared by emulsifying vinyl chloride monomer or a mixture of vinyl chloride monomer and unsaturated polymerizable compounds and polymerizing the monomers to produce polymers and copolymers of vinyl chloride. The improvement in paste qualities of the powders is achieved by introducing the spray dried powder into an air jet having a velocity from about 330 to 550 meters per second and having a weight ratio of gas to solids ranging from 1:10 to 5:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.