Vapor precipitation of polymers from solvent polymer blends by azeotropic spray drying
US5618902A · kind A · utility
5Cited by
5References
9Claims
0Family size
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Key dates
| Filing date | Nov 3, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Nov 3, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/582
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for removing contaminating solvents from solutions containing solid solutes comprising contacting a co-solvent that forms an azeotrope with the contaminating solvent forming a mixture thereby and spray drying the contaminating solvent co-solvent mixture in the presence of the co-solvent at a temperature equal to or above the temperature where the azeotrope distills whereby the contaminating solvent has been azeotropically distilled away from the solute. The process is particularly useful for polymeric solutes, especially silicones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.