公开(公告)号：US3642756A

公开(公告)日：1972-02-15

申请号：US3642756D

申请日：1969-08-22

申请人： DOW CHEMICAL CO

发明人： MEEKS MERRITT R ,  GARNER JOSEPH L

IPC分类号： C08F14/00 ,  C08F2/00 ,  C08F2/18 ,  C08F2/38 ,  C08F14/06 ,  C08F1/82 ,  C08F1/11 ,  C08F3/30

CPC分类号： C08F14/06 ,  Y10S526/91 ,  C08F2/18

摘要： THE PRESENT INVENTION IS DIRECTED TO A METHOD OF EFFECTIVELY ELIMINATING THE RAPID POLYMERIZATION OR "HOT-SPOT" NORMALL ENCOUNTERED NEAR THE END OF THE SUPENSION POLYMERIZATION REACTION OF VINYL CHLORIDE MONOMER. THIS RESULT IS OBAINED BY THE ADDITION TO THE AQUEOUS SUSPENSION OF VINYL CHLORIDE MONOMER TO BE POLYMERIZED OF SMALL BUT EFFECTIVE AMOUNTS OF ONE OR MORE COMPOUNDS CAPABLE OF EFFECTIVELY INHIBITING THE POLYMERIZATION REACTION UNDER NORMAL POLYMERIZATION TEMPERATURES AND PRESSURES. THE ADDITION OF SUCH POLYMERIZATION INHIBITORS EFFECTIVELY ELIMINATE SUCH POLYMERIZATION "HOT-SPOT" AND ADDITIONALLY, UNEXPECTEDLY PERMITS THE UTILIZATION OF INCREASED AMOUNTS OF PLYMERIZATION INITIATORS WITH RESULTANT INCREASED OVERALL RATES OF PLYMERIZATION, WITHOUT EXCEEDING THE COOLING CAPACITY OF A GIVEN REACTION VESSEL.