Apparatus and method for producing resin
US6562936B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2001 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Jun 11, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of producing a polycarbonate or the like which is excellent in hydrolysis and heat stability such as a reduction in molecular weight at the time of molding and color retention and moldability such as releasability and transferability, rarely experiences residence deterioration such as coloring, crosslinking and gel formation and has an extremely small content of foreign matter by employing a special structure for an opening in the side surface of a horizontal cylindrical vacuum resin treating apparatus, supplying a molten polycarbonate into a unidirectional rotary intermeshing double-screw extruder under specific conditions, adding a specific agent under specific conditions and cleaning the inner surface of a production apparatus by a specific method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.