| 摘要 |
THERE IS DISCLOSED A PROCESS FOR PRODUCING A VINYL RESIN BY SUSPENSION POLYMERIZATION OF A VINYL COMPOUND IN THE PRESENCE OF A SUSPENDING AGENT (A) WHICH COMPRISES USING A POLYMERIZATION VESSEL EQUIPPED WITH A REFLUX CONDENSER AND ADDING A POLYVINYL ALCOHOL (B) HAVING A DEGREE OF HYDROLYSIS OF AT MOST 85 MOLIN AN AMOUNT OF 0.001 TO 0.5 PART BY WEIGHT BASED ON 100 PARTS BY WEIGHT OF SAID VINYL COMPOUND WHEN A POLYMERIZATION CONVERSION IS IN THE RANGE OF 30 TO 90ACCORDING TO THE PRESENT INVENTION, THERE IS PROVIDED A PROCESS FOR PRODUCING A VINYL RESIN HAVING A HIGH BULK DENSITY, WHICH IS EXCELLENT IN ANTI-FOAMING EFFECT AGAINST THE DRY FOAM BEING GENERATED IN THE MIDDLE TO LATTER PERIOD OF THE SUSPENSION POLYMERIZATION IN A POLYMERIZATION VESSEL EQUIPPED WITH A REFLUX CONDENSER WHICH IS EXCELLENT IN PRODUCTIVITY.
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