发明授权
- 专利标题： Low melt elasticity composition of polypropylene
- 专利标题（中）： 聚丙烯低熔点弹性组合物
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申请号： US3563972D申请日： 1969-10-15
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公开(公告)号： US3563972A公开(公告)日： 1971-02-16
- 发明人: KOWALSKI RONALD C
- 申请人： EXXON RESEARCH ENGINEERING CO
- 专利权人： ExxonMobil Research and Engineering Co
- 当前专利权人： ExxonMobil Research and Engineering Co
- 优先权： US86676969 1969-10-15
- 主分类号： C08F8/50
- IPC分类号： C08F8/50 ; C08F3/08
摘要：
A METHOD FOR PRODUCING A POLYPROPYLENE COMPOSITION HAVING A MELT ELASTICITY (SWELL) VALUE BETWEEN 1.5 AND 3.0 COMPRISES CONTACTING THE POLYPROPYLENE WITH OXYGEN, HEATING THE POLYPROPYLENE IN THE FEED-END OF AN EXTRUDERREACTOR AT TEMPERATURE BETWEEN 600* AND 1,000*F. AND THEN COOLING THE POLYPROPYLENE TO A MELT TEMPERATURE NOT IN EXCESS OF 600*F. A POLYPROPYLENE COMPOSITION HAVING A MELT ELASTICITY (SWELL) OF LESS THAN 3.0 HAS A MOLECULAR WEIGHT DISTRIBUTION WHICH IS VERY NARROW AS COMPARED TO COMMERICAL POLYPROPYLENE COMPOSITIONS.