Equipment cleaning in the manufacture of polycarbonates
US7365149B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 12, 2005 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Jun 13, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A surface of a melt polymerization reactor system having residual reaction components of a melt polymerization reaction thereon can be cleaned by introducing a cleaning agent having a phenolic compound to the polymerization reactor system and into contact with the surface of the melt polymerization reactor system having the residual reaction components of a melt polymerization reaction thereon. The residual reaction components of the melt polymerization reaction include polycarbonate oligomers or polymers or their degradation products. Further, the cleaning agent is maintained in contact with the surface for a period of time and at a temperature sufficient to substantially remove the residual reaction components from the surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.