-
公开(公告)号：US5371145A
公开(公告)日：1994-12-06
申请号：US73173
申请日：1993-06-08
CPC分类号： C08L23/06 , C08L23/0815 , C08L2205/02 , C08L2314/02
摘要： A process comprising continuously contacting with a catalyst, under polymerization conditions, ethylene or a mixture comprising ethylene and one or more alpha-olefins in a first fluidized bed reactor and a mixture comprising ethylene and one or more alpha-olefins in a second fluidized bed reactor, the first and second reactors being connected in series, said catalyst comprising:(A) a catalyst precursor comprising:(i) a vanadium compound, which is the reaction product of(a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and(b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble;(ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) wherein each X is as defined above; each R is independently alkyl having 1 to 14 carbon atoms; and a is 1 or 2; and(iii) a silica or alumina support for said vanadium compound and modifier;(B) a cocatalyst having the formula AlR.sub.3 wherein R is as defined above; and(C) a promoter having the formula R'.sub.b CX'.sub.(4-b) wherein R' is hydrogen or an unsubstituted or halo substituted alkyl having 1 to 6 carbon atoms; X' is a halogen; and b is 0, 1, or 2, wherein,in the first reactor,a homopolymer or copolymer is made having a relatively high melt index in the range of about 1 to about 100 grams per 10 minutes; a density of at least 0.950 gram per cubic centimeter; and a melt flow ratio in the range of about 50 to about 100; andin the second reactor,a copolymer is made having a relatively low melt index in the range of about 0.001 to about 0.01 gram per 10 minutes; a density of at least 0.925 gram per cubic centimeter; and a melt flow ratio in the range of about 50 to about 100,wherein, in the second reactor, the first reactor homopolymer or copolymer and the second reactor copolymer are blended in situ.
摘要翻译： 一种方法，包括在聚合条件下，在第一流化床反应器中和乙烯或包含乙烯和一种或多种α-烯烃的混合物和包含乙烯和一种或多种α-烯烃的混合物在第二流化床反应器 所述催化剂包括：（A）催化剂前体，其包含：（i）钒化合物，其为（a）VX 3的反应产物，其中每个X独立地为氯，溴或 碘; 和（b）电子给体，其是VX3可溶于其中的液体有机路易斯碱; （ii）具有式BX3或AlR（3-a）的改性剂，其中每个X如上所定义; 每个R独立地为具有1至14个碳原子的烷基; a为1或2; 和（iii）所述钒化合物和改性剂的二氧化硅或氧化铝载体; （B）具有式AlR 3的助催化剂，其中R如上定义; 和（C）具有式R'bCX'（4-b）的促进剂，其中R'是氢或未取代或卤素取代的具有1至6个碳原子的烷基; X'是卤素; 并且b为0,1或2，其中在第一反应器中制备的均聚物或共聚物具有在约1至约100克/ 10分钟范围内的较高熔融指数; 密度至少为0.950克/立方厘米; 和熔体流动比在约50至约100的范围内; 并且在第二反应器中，制备具有在约0.001至约0.01克/ 10分钟范围内的较低熔体指数的共聚物; 密度至少为0.925克/立方厘米; 和约50至约100范围内的熔体流动比，其中在第二反应器中，将第一反应器均聚物或共聚物和第二反应器共聚物原位共混。
-
2.发明授权
公开(公告)号：US4454281A
公开(公告)日：1984-06-12
申请号：US445944
申请日：1982-12-01
摘要： An ethylene polymer film forming composition comprising an ethylene polymer and from about 450 to about 6000 ppm preferably 500 to 5000 ppm of metal salt of a fatty acid having from 7 to 22 carbon atoms and from about 300 to 7000 ppm preferably 500 to 4000 ppm of an antiblocking agent.
摘要翻译： 包含乙烯聚合物和约450至约6000ppm，优选500至5000ppm的具有7至22个碳原子的脂肪酸金属盐和约300至7000ppm，优选500至4000ppm的乙烯聚合物膜形成组合物， 防粘剂。
-
3.发明授权
公开(公告)号：US4963622A
公开(公告)日：1990-10-16
申请号：US372466
申请日：1989-06-28
申请人： William D. Heitz
发明人： William D. Heitz
CPC分类号： C08L23/04 , C08J5/18 , C08L23/06 , C08J2323/04 , C08L33/12
摘要： A process for improving bubble stability, reducing film gauge variation and reducing melt fracture during extrusion and formation of film from a high density polyolefin of molecular weight above 225,000 to about 450,000 which comprises blending with said polyolefin about 0.1 to about 0.8% of an acrylic polymer polymerized from a monomer system comprising at least 50% by weight of methyl methacrylate.
摘要翻译： 一种用于改善气泡稳定性，降低膜规变化并减少挤出过程中的熔体断裂和从分子量高于225,000至约450,000的高密度聚烯烃形成膜的方法，其包括与所述聚烯烃共混约0.1至约0.8％的丙烯酸聚合物 由包含至少50重量％甲基丙烯酸甲酯的单体体系聚合。
-
公开(公告)号：US4814135A
公开(公告)日：1989-03-21
申请号：US136719
申请日：1987-12-22
申请人： William D. Heitz
发明人： William D. Heitz
CPC分类号： B29C61/003 , B29C47/00 , B29C47/0026 , B29C55/00 , B29K2023/06
摘要： A process for extrusion comprising extruding, under conditions which will provide a shrink film, a linear low density copolymer of ethylene and at least one alpha-olefin having 3 to 6 carbon atoms, said copolymer having (i) a density in the range of about 0.915 to about 0.932 grams per cubic centimeter; (ii) a weight average molecular weight of at least about 250,000, (iii) a ratio of weight average molecular weight to number average molecular weight of at least about 6; and (iv) a copolymer species with a molecular weight of at least about 500,000 in an amount of at least about 8 percent by weight based on the weight of the copolymer.
-
-
-
搜索结果
4 条记录 (耗时 0.024 秒)
