公开(公告)号：US20030065097A1

公开(公告)日：2003-04-03

申请号：US10100687

申请日：2002-03-15

Applicant: The Dow Chemical Company

Inventor： Alexander W. DeGroot ,  James C. Stevens ,  Sylvie Y. Desjardins ,  Jeffrey Weinhold ,  Edmund Carnahan ,  David Gillespie ,  Daniel D. VanderLende

IPC: C08F008/00

CPC classification number: C08F210/16 ,  C08F4/65908 ,  C08F4/65912 ,  C08F4/6592 ,  C08F4/65925 ,  C08F4/65927 ,  C08F10/00 ,  C08L23/04 ,  C08L23/06 ,  C08L23/0815 ,  C08L2205/02 ,  C08L2205/025 ,  C08L2207/07 ,  C08L2314/02 ,  C08L2314/06 ,  Y02P20/52 ,  Y10S526/943 ,  C08F2/001 ,  C08F4/65904 ,  C08F2/06 ,  C08L2666/04 ,  C08F210/14 ,  C08F2500/11 ,  C08F2500/12 ,  C08F2500/01 ,  C08F2500/03 ,  C08F2500/04 ,  C08F2500/02 ,  C08F2/00 ,  C08F2500/08 ,  C08F2500/05 ,  C08F2500/17 ,  C08F2500/26

Abstract: A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: 1 M null null null S null x I 2 + y where x is greater than or equal to about 12.5 and y is greater than or equal to about 3. Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: 2 M null null null S null x I 2 + y where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.

公开(公告)号：US20030088037A1

公开(公告)日：2003-05-08

申请号：US10100557

申请日：2002-03-15

Applicant: The Dow Chemical Company

Inventor： James C. Stevens ,  Daniel D. VanderLende

IPC: C08F002/00

CPC classification number: C08F210/16 ,  C08F4/65908 ,  C08F4/65912 ,  C08F4/6592 ,  C08F4/65925 ,  C08F4/65927 ,  C08F10/00 ,  C08L23/04 ,  C08L23/06 ,  C08L23/0815 ,  C08L2205/02 ,  C08L2205/025 ,  C08L2207/07 ,  C08L2314/02 ,  C08L2314/06 ,  Y02P20/52 ,  Y10S526/943 ,  C08F2/001 ,  C08F4/65904 ,  C08F2/06 ,  C08L2666/04 ,  C08F210/14 ,  C08F2500/11 ,  C08F2500/12 ,  C08F2500/01 ,  C08F2500/03 ,  C08F2500/04 ,  C08F2500/02 ,  C08F2/00 ,  C08F2500/08 ,  C08F2500/05 ,  C08F2500/17 ,  C08F2500/26

Abstract: A polymerization process comprises contacting one or more olefinic comonomers in the presence of at least a high molecular weight catalyst and at least a low molecular weight catalyst in a single reactor; and effectuating the polymerization of the olefinic comonomers in the reactor to obtain an olefin polymer. Preferably, both catalysts have the ability to incorporate a substantially similar amount of comonomers in the olefin polymer. The polymers produced by the process may have a relatively higher level of long chain branching while maintaining a relatively narrow molecular weight distribution, i.e., MWD less than about 6. These interpolymers may exhibit processability similar to or better than LDPE but have physical properties similar to metallocene catalyzed polymers.

Abstract translation: 聚合方法包括在单个反应器中在至少一种高分子量催化剂和至少一种低分子量催化剂的存在下使一种或多种烯属共聚单体接触; 并且在反应器中实现烯烃共聚单体的聚合以获得烯烃聚合物。 优选地，两种催化剂具有在烯烃聚合物中引入基本相似量的共聚单体的能力。 通过该方法生产的聚合物可以具有相对较高水平的长链支化，同时保持相对窄的分子量分布，即MWD小于约6.这些互聚物可以表现出与LDPE相似或优于LDPE的加工性能，但具有类似于 茂金属催化聚合物。