Production method of aromatic polycarbonate
US8715552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2007 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Feb 11, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2069/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The object of the present invention is to provide a production method for an aromatic polycarbonate, in which eye boogers at the time of extrusion molding are reduced, and a continuous operation for a long period of time is possible. The present invention relates to a method when an extrusion molding is produced using an extruder in which a tapered part 1 has a half apex angle of from 4 to 20° formed at the outlet part of a die hole 9, and outlet parts of plural die holes 9 are arranged in a staggered state at the resin discharge surface side of a die plate 10, the shear rate γ at the extruder outlet is from 100 to 500 sec−1, and the shear stress τ is from 50 to 200 kPa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.