| 摘要 |
A RELATIVELY LOW MOLECULAR WEIGHT, MID-RANGE VINYLIDENE CONTENT PIB POLYMER PRODUCT AND A PROCESS FOR MAKING THE SAME. AT LEAST ABOUT 90OF THE PIB MOLECULES PRESENT IN THE PRODUCT COMPRISE ALPHA OR BETA POSITION ISOMERS. THE VINYLIDENE (ALPHA) ISOMER CONTENT OF THE PRODUCT MAY RANGE FROM 20TO 70THEREOF AND THE CONTENT OF TETRA-SUBSTITUTED INTERNAL DOUBLE BONDS IS VERY LOW, PREFERABLY LESS THAN ABOUT 5AND IDEALLY LESS THAN ABOUT 1-2THE MID-RANGE VINYLIDENE CONTENT PIB POLYMER PRODUCTS ARE PREPARED BYA LIQUID PHASE POLYMERIZATION PROCESS CONDUCTED IN A LOOP REACTOR (10, 100) AT A TEMPERATURE OF AT LEAST 60º F USING BF3/METHANOL CATALYST COMPLEX AND A CONTACT TIME OF NO MORE THAN 4 MINUTES.
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