Process for preparation of modified methacrylic resin molding material
US5047188A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1989 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Jun 21, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/0005
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Disclosed is a process for the preparation of a modified methacrylic resin molding material, wherein a volatile component is removed from a methacrylic polymer composition containing a volatile component including an unreacted monomer, a solvent or a by-product, and a modifying polymer is added to the methacrylic polymer composition to prepare a modified molding material. The removal of a volatile component from the methacrylic polymer composition and the addition and kneading of a modifying polymer into this polymer composition can be performed at a high efficiency by a process wherein a volatile component-removing extruder comprising a plurality of vent zones and a modifying polymer supply mechanism arranged upstream of the final vent zone but preferably downstream of the adjacent vent zone is used, the modifying polymer is fed from the modifying polymer supply mechanism and incorporated into the methacrylic polymer composition continuously flowing in the volatile component-removing extruder, and the volatile component is removed from the obtained mixture in the final vent zone and the mixture is then extruded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.