公开(公告)号：US06359085B1

公开(公告)日：2002-03-19

申请号：US09522845

申请日：2000-03-10

申请人： Olivier Lhost ,  Nicole Dewaele ,  Martine Frederickx ,  Joel Kaisin

发明人： Olivier Lhost ,  Nicole Dewaele ,  Martine Frederickx ,  Joel Kaisin

IPC分类号： C08F422

CPC分类号： C08F10/02 ,  C08F110/02 ,  C08F210/16 ,  C08F4/24 ,  C08F2500/12 ,  C08F2500/17 ,  C08F2500/07 ,  C08F2500/13

摘要： The invention relates to a process for the production of ethylene polymers by the polymerization of ethylene or the copolymerization of ethylene with one or more C3 to C8 olefins in contact with a chromium-based catalyst deposited on a support essentially consisting of silica. According to the invention, the chromium catalyst is subjected in succession to a heat treatment in nitrogen and then to a heat treatment in air under defined temperature conditions before bringing it into contact with ethylene and, optionally, one or more olefins under polymerizing conditions. The process of the invention makes it possible to manufacture ethylene polymers having an improved compromise between processability, stiffness and resistance to slow crack growth.

摘要翻译： 本发明涉及通过乙烯的聚合或乙烯与一种或多种C 3 -C 8烯烃的共聚合制备乙烯聚合物的方法，该烯烃与沉积在基本上由二氧化硅组成的载体上的铬基催化剂接触。 根据本发明，铬催化剂依次在氮气中进行热处理，然后在空气中在规定的温度条件下进行热处理，然后使其与乙烯和任选的一种或多种烯烃在聚合条件下接触。 本发明的方法使得可以制造具有改进的加工性，刚度和耐缓慢裂纹生长的耐受性之间的乙烯聚合物。

公开(公告)号：US5003038A

公开(公告)日：1991-03-26

申请号：US491519

申请日：1990-03-12

申请人： Pierre Malfroid ,  Qui L. Nguyen ,  Nicole Dewaele ,  Jean-Marie Blondin ,  Jean-Paul Burnay

发明人： Pierre Malfroid ,  Qui L. Nguyen ,  Nicole Dewaele ,  Jean-Marie Blondin ,  Jean-Paul Burnay

IPC分类号： C08F14/06 ,  C08F2/44 ,  C08F14/00 ,  C08F283/00 ,  C08F283/02 ,  C08G63/08 ,  C08G63/68 ,  C08G63/682 ,  C08G63/82 ,  C08G63/91

CPC分类号： C08G63/823 ,  C08F283/02

摘要： In a first stage, a lactone is polymerized by an ionic route in vinyl chloride with the aid of a catalyst consisting of the product, optionally complexed with tetrahydrofuran, of the reaction of an alkylmetal with ethylenically unsaturated alcohol, optionally in the presence of water and, in a second stage, the said vinyl chloride is polymerized by a radical route in an aqueous suspension and in the presence of the polymerization medium originating from the first stage, to which other unsaturated monomers are optionally added.The invention also relates to new modified vinyl chloride polymers consisting of lactone polymers whose number-average molecular weight is less than 5,000, grafted with vinyl chloride polymers.

摘要翻译： 在第一阶段中，借助于由任选与四氢呋喃络合的产物的催化剂，在氯乙烯中通过离子路线聚合内酯，烷基金属与烯键式不饱和醇的反应，任选在水和 在第二阶段中，所述氯乙烯通过自由基途径在水悬浮液中聚合，并且在来自第一阶段的聚合介质存在下，任选地加入其它不饱和单体。 本发明还涉及由数均分子量小于5,000的内酯聚合物组成的新的改性氯乙烯聚合物，用氯乙烯聚合物接枝。