公开(公告)号：US5503914A

公开(公告)日：1996-04-02

申请号：US272260

申请日：1994-07-08

申请人： William J. Michie, Jr. ,  George E. Ealer ,  Guylaine St. Jean ,  Charles J. Sakevich ,  Diane J. Rickman-Davis

发明人： William J. Michie, Jr. ,  George E. Ealer ,  Guylaine St. Jean ,  Charles J. Sakevich ,  Diane J. Rickman-Davis

IPC分类号： B29C47/00 ,  B29K23/00 ,  B29L7/00 ,  C08F4/60 ,  C08F4/654 ,  C08F4/659 ,  C08F10/00 ,  C08F210/02 ,  C08F210/16 ,  C08F297/00 ,  C08F297/08 ,  C08J5/18 ,  C08L23/00 ,  C08L23/08 ,  C08L23/18 ,  C08L23/20

CPC分类号： C08J5/18 ,  C08F210/16 ,  C08F297/00 ,  C08F297/08 ,  C08L23/0815 ,  C08J2323/08 ,  C08J2323/16 ,  C08L2205/02 ,  C08L2314/02

摘要： A film comprising a blend of copolymers, which has been extruded (i) to a film having a gauge of less than about 1.8 mils; a dart impact strength of at least about 80 grams per mil at a density of 0.926 gram per cubic centimeter; and a dart impact strength of at least about 480 grams per mil at a density of 0.918 gram per cubic centimeter and/or (ii) to a film having a gauge of less than about 5 mils, and a blocking force of less than about 120 grams and a COF in the range of about 0.2 to about 0.5, said blend having been produced in situ by contacting ethylene and at least one alpha-olefin comonomer with a magnesium/titanium based catalyst system in each of two reactors connected in series, under polymerization conditions, wherein the polymer formed in the high molecular weight reactor has a flow index in the range of about 0.01 to about 30 grams per 10 minutes and a density in the range of about 0.860 to about 0.940 gram per cubic centimeter and the polymer formed in the low molecular weight reactor has a melt index in the range of about 50 to about 3000 grams per 10 minutes and a density in the range of about 0.900 to about 0.970 gram per cubic centimeter, the weight ratio of high molecular weight reactor polymer to low molecular weight reactor polymer being in the range of about 0.5:1 to about 2:1 with the proviso that for film (i), 1-butene is at least one of the comonomer(s) used in the low molecular weight reactor and is present in the in situ blend in a weight ratio of 1-butene to the other comonomer(s) in the range of about 0.001:1 to about 1.3:1, and for film (ii), the film is essentially free of antiblock and slip agents.

摘要翻译： 一种包含共聚物共混物的膜，其已经挤出（i）到具有小于约1.8密耳的量规的膜; 在0.926克/立方厘米的密度下，至少约80克/密耳的飞镖冲击强度; 以及在0.918克/立方厘米的密度下至少约480克/密耳的镖冲击强度和/或（ii）具有小于约5密耳的量规的膜，以及小于约120密耳的阻塞力 克和约0.2至约0.5范围内的COF，所述共混物通过在两个串联连接的两个反应器中的每一个中的乙烯和至少一种α-烯烃共聚单体与基于镁/钛的催化剂体系接触而原位制备， 聚合条件，其中在高分子量反应器中形成的聚合物的流动指数在约0.01至约30克/ 10分钟的范围内，密度在约0.860至约0.940克/立方厘米的范围内，形成的聚合物 在低分子量反应器中的熔体指数在约50至约3000克/ 10分钟的范围内，密度在约0.900至约0.970克/立方厘米的范围内，高分子量反应器的重量比 裂解至低分子量反应器聚合物的范围为约0.5:1至约2:1，条件是对于膜（i），1-丁烯是低分子量中使用的至少一种共聚单体 并且以约0.001:1至约1.3:1的范围以1-丁烯与其它共聚单体的重量比存在于原位共混物中，并且对于膜（ii），该膜基本上是游离的 的防粘剂和滑爽剂。