TH68154B - Devices and methods for degassing of solvent-containing polycarbonate solutions - Google Patents

Abstract

DC60 (25/11/54) This invention involves tools. And a process for removing volatile components. Of solvent polycarbonate solution by means of fabrication apparatus, polycarbonate With low residue of volatile components. It is produced from the fused polymer with solvent, whose optical properties are improved, especially the yellowness index (YI), with the help of a combination of Evaporative Conduit Eliminator Tool That can provide heat And extruder with vent

Claims (9)

Disclaimer (all) which will not appear on the advertisement page. : ------ 20/10/2017 ------ (OCR) Page 1 of 2 pages. 1. A tool for the removal of volatile parts of polycarbonate melts. Containing solvents, characterized by the downpipe evaporative degreaser. A casing-and-tubular heat exchanger consisting of at least one heat exchanger is combined with a vented extruder, where the casing heat exchanger is And - such pipes are arranged at a perpendicular angle on the splitter And it is directly connected to this, and this splitter will be connected in a way that is not restricted and cannot be blocked. Through the bottom cone directly to The extruder casing of the extruder has a vent, and on which the vapor line is mounted on the Downpipe Evaporative Eliminator 2. The instrument according to claim 1, which is characterized by the removal The downpipe evaporator consists of a casing-and-tube heat exchanger. With a certain number of pipes Which will be heated from the outside 3. The instrument according to claim 1 or 2, which is characterized by the combination of Downpipe Evaporative Eliminator And extruder with vent Will be at the beginning of the stream of At least one additional downpipe evaporator eliminator 4. Any instrument of claim 1 through 3, which is characterized by that Vented extruders are those with two or four shafts. 5. Any instrument of claim 1 through 4, which is characterized by that The vented extruder is a closely aligned twin screw extruder. 6. Any instrument of claim 1 to 5, which is characterized by that The extruder has several evaporative evaporation areas in the conveying direction, page 2 of the number 2. 7. A process for the removal of volatile parts of a solution of polycarbonate, which is characterized as a polycarbonate solution. Which contains solvent type At least one type of organic And at least one kind of polycarbonate Will be prepared by the process Occurs between the solder faces and, in the second step, the polycarbonate solution is It is supplied to the downpipe evaporative dehydrator in combination with the vented extruder, where the downpipe evaporative condenser is directly provided. Above the extruder In such a way that the polymer solution flows directly into the vented extruder, and the solvent-containing vapor is generated in the downpipe evaporative condenser. It is removed directly from the downpipe evaporative condenser casing via a vapor hose. 8. Process according to claim 7, which is characterized as inert gas. As a carrier, it is injected in and mixed in the stream of the melt stream. Of polymers of downpipe evaporator 9. Process for any one of Claim 7 and 8, Specified That inert gas is injected as a carrier in one or more of the Extruder with vent 1 0. Process according to any of Claims 7 through 9, Specified. This is that the polycarbonate inlet concentration to the downpipe evaporation dehydrator is between 60% wt and 95% wt. ------------ 1. Apparatus for Elimination of the volatile content of solvent-containing polycarbonate fused, characterized by the downpipe evaporative evaporator is combined with the vented extruder. , Where a downpipe evaporative condenser is provided directly above the extruder.