Process for the preparation of polyvinyl chloride polymerizates suitable for vinyl pastes
Abstract
Abstract A PROCESS FOR THE PREPARATION OF VINYL CHLORIDE POLYMERIZATES SUITABLE FOR VINYL PASTES WHICH CONSISTS ESSENTIALLY OF APPLYING A THIN LAYER OF AN AQUEOUS VINYL CHLORIDE POLYMERIZATE DISPERSION PREPARED BY POLYMERIZATION OF A STABLE, AQUEOUS MONOMERIC DISPERSION OF VINYL CHLORIDE CONTAINING UP TO 20% BY WEIGHT OF ETHYLENICALLY-UNSATURATED MONOMERS COPOLYMERIZABLE WITH VINYL CHLORIDE PREHOMOGENIZED IN THE PRESENCE OF EMULSIFIERS AND OILSOLUBLE CATALYSTS TO A ROLLER DRIER BY MEANS OF AN APPLICATION ROLLER IN CONTACT WITH SAID AQUEOUS POLYMERIZATE DISPERSION, DRYING SAID AQUEOUS POLYMERIZATE DISPERSION IN SAID THIN LAYER ON SAID ROLLER DRIER AT A TEMPERATURE BETWEEN ABOUT 90*C. TO 110*C. TO A MOISTURE CONTENT OF FROM 3% TO 12% BY WEIGHT, REMOVING SAID PARTIALLY DRIED VINYL CHLORIDE POLYMERIZATE POWDER FROM SAID DRIER ROLLER, GRINDING SAID POWDER IN AN AIR STREAM AT A TEMPERATURE BETWEEN 20*C. -40*C., UNTIL SAID POWDER HAS A MOISTURE CONTENT OF 0.3% BY WEIGHT MAXIMUM AND RECOVERING A POWDERED VINYL CHLORIDE POLYMERIZATE SUITABLE FOR VINYL PASTES.
Inventors
- 👤 Jobst Possberg
- 👤 Kai Rostock
- 👤 Eligius Nickl
- 👤 Otmar Zajicek
- 👤 Helmut Klapp
Bibliographic Details
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