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1. 发明授权

US5792534A Polyolefin film exhibiting heat resistivity, low hexane extractives and controlled modulus 失效
标题翻译：聚烯烃膜显示出耐热性，低己烷萃取液和可控模量
公开(公告)号：US5792534A
公开(公告)日：1998-08-11
申请号：US475953
申请日：1995-06-07
申请人： Jacquelyn A. deGroot , Lonnie G. Hazlitt , Pradeep Jain , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
发明人： Jacquelyn A. deGroot , Lonnie G. Hazlitt , Pradeep Jain , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
IPC分类号： B65D81/34 , B29C47/00 , B29K23/00 , B29L9/00 , B32B27/32 , B65D1/00 , B65D65/40 , C08F110/02 , C08F210/08 , C08F210/16 , C08J5/18 , C08L23/04 , C08L23/06 , C08L23/08 , C08L23/16 , C09J123/08
CPC分类号： C08L23/06 , B29C47/0004 , B29C47/0021 , B29C47/0026 , B32B27/32 , B32B27/322 , C08J5/18 , C08L23/0815 , C09J123/0815 , C08F110/02 , C08F210/16 , C08J2323/04 , C08J2323/08 , C08L2205/02 , C08L2314/06 , Y10T428/1334 , Y10T428/1352 , Y10T428/1393 , Y10T428/1397 , Y10T428/24992 , Y10T428/2826 , Y10T428/31913
摘要： The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.
摘要翻译：本发明提供了具有高耐热性，低己烷萃取和可控地更低或更高模量的聚合物混合物。该混合物由至少一种第一基本上线性的乙烯聚合物，组分（A）和至少一种第二乙烯聚合物组成，其是均匀支化的聚合物，非均匀支化的线性聚合物或非短链支化的线型聚合物。当制成膜时，混合物的特征在于热封起始温度明显低于其维卡软化点以及高极限热粘性强度。当制造成模制品时，混合物的特征在于高的微波翘曲变形，同时保持较低的模量。聚合物混合物特别适合用于多层膜结构，作为诸如煮熟包装，热填充包装和阻挡收缩膜之类的应用的密封剂层。在成型应用中，该混合物非常适合作为冷冻至微波食品储存容器和盖子，其在低温下保持良好的柔韧性，以允许这种容器容易打开。

2. 发明授权

US5747594A Polyolefin compositions exhibiting heat resistivity, low hexane-extractives and controlled modulus 失效
公开(公告)号：US5747594A
公开(公告)日：1998-05-05
申请号：US788981
申请日：1997-01-27
申请人： Jacquelyn A. deGroot , Lonnie G. Hazlitt , Pradeep Jain , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
发明人： Jacquelyn A. deGroot , Lonnie G. Hazlitt , Pradeep Jain , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
IPC分类号： B65D81/34 , B29C47/00 , B29K23/00 , B29L9/00 , B32B27/32 , B65D1/00 , B65D65/40 , C08F110/02 , C08F210/08 , C08F210/16 , C08J5/18 , C08L23/04 , C08L23/06 , C08L23/08 , C08L23/16 , C09J123/08
CPC分类号： C08L23/06 , B29C47/0004 , B29C47/0021 , B29C47/0026 , B32B27/32 , B32B27/322 , C08J5/18 , C08L23/0815 , C09J123/0815 , C08F110/02 , C08F210/16 , C08J2323/04 , C08J2323/08 , C08L2205/02 , C08L2314/06 , Y10T428/1334 , Y10T428/1352 , Y10T428/1393 , Y10T428/1397 , Y10T428/24992 , Y10T428/2826 , Y10T428/31913
摘要： The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.

3. 发明授权

US5773106A Polyolefin compositions exhibiting heat resistivity, low hexane-extractives and controlled modulus 失效
标题翻译：显示出耐热性，低己烷萃取物和可控模量的聚烯烃组合物
公开(公告)号：US5773106A
公开(公告)日：1998-06-30
申请号：US487819
申请日：1995-06-07
申请人： Jacquelyn A. deGroot , Pradeep Jain , Lonnie G. Hazlitt , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
发明人： Jacquelyn A. deGroot , Pradeep Jain , Lonnie G. Hazlitt , Seema V. Karande , Laura K. Mergenhagen , Dan G. Moldovan , Kenneth B. Stewart , Nicole F. Whiteman
IPC分类号： B65D81/34 , B29C47/00 , B29K23/00 , B29L9/00 , B32B27/32 , B65D1/00 , B65D65/40 , C08F110/02 , C08F210/08 , C08F210/16 , C08J5/18 , C08L23/04 , C08L23/06 , C08L23/08 , C08L23/16 , C09J123/08 , B29D31/00
CPC分类号： C08L23/06 , B29C47/0004 , B29C47/0021 , B29C47/0026 , B32B27/32 , B32B27/322 , C08J5/18 , C08L23/0815 , C09J123/0815 , C08F110/02 , C08F210/16 , C08J2323/04 , C08J2323/08 , C08L2205/02 , C08L2314/06 , Y10T428/1334 , Y10T428/1352 , Y10T428/1393 , Y10T428/1397 , Y10T428/24992 , Y10T428/2826 , Y10T428/31913
摘要： The subject invention provides a polymer mixture having high heat resistivity, low hexane extractive and controllably lower or higher modulus. The mixture is comprised of at least one first substantially linear ethylene polymer, Component (A), and at least one second ethylene polymer which is a homogeneously branched polymer, heterogeneously branched linear polymer or a non-short chain branched linear polymer. When fabricated into film, the mixture is characterized by a heat seal initiation temperature which is substantially lower than its Vicat softening point as well as a high ultimate hot tack strength. When fabricated as a molded article, the mixture is characterized by high microwave warp distortion while maintaining a lower modulus. The polymer mixture is particularly well-suited for use in multilayer film structures as a sealant layer for such applications as cook-in packages, hot-fill packages, and barrier shrink films. In molding applications, the mixture is well-suited as freezer-to-microwave food storage containers and lids which maintain good flexibility at low temperature to allow easy openability of such containers.
摘要翻译：本发明提供了具有高耐热性，低己烷萃取和可控地更低或更高模量的聚合物混合物。该混合物由至少一种第一基本上线性的乙烯聚合物，组分（A）和至少一种第二乙烯聚合物组成，其是均匀支化的聚合物，非均匀支化的线性聚合物或非短链支化的线型聚合物。当制成膜时，混合物的特征在于热封起始温度明显低于其维卡软化点以及高极限热粘性强度。当制造成模制品时，混合物的特征在于高的微波翘曲变形，同时保持较低的模量。聚合物混合物特别适合用于多层膜结构，作为诸如煮熟包装，热填充包装和阻挡收缩膜之类的应用的密封剂层。在成型应用中，该混合物非常适合作为冷冻至微波食品储存容器和盖子，其在低温下保持良好的柔韧性，以允许这种容器容易打开。

4. 发明授权

US06469103B1 Narrow MWD, compositionally optimized ethylene interpolymer composition, process for making the same and article made therefrom 有权
标题翻译：窄MWD，组分优化的乙烯互聚物组合物，其制备方法和由其制备的制品
公开(公告)号：US06469103B1
公开(公告)日：2002-10-22
申请号：US09156948
申请日：1998-09-18
申请人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
发明人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
IPC分类号： C08L2306
CPC分类号： C08L23/0815 , C08F210/16 , C08L2205/02 , C08L2308/00 , C08L2314/06 , C08L2666/04 , C08F210/14 , C08F2500/03 , C08F2500/12 , C08F2500/26 , C08F2/001
摘要： The present invention pertains to an ethylene interpolymer composition characterized as having a narrow molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a composition and a fabricated article made from such composition. The novel composition is characterized as having at least two polymer components, the first component having an ATREF peak temperature, Tpeak1 and a viscosity average molecular weight, Mv1, and the second component having an ATREF peak temperature, Tpeak2, and a viscosity average molecular, Mv2, wherein the temperature differential between Tpeak2 and Tpeak1 decreases with increased composition density and Mv1/Mv2 is less than or equal to 1.2. The novel composition is further characterized as having a Mw/Mn of less than or equal to 3.3 as determined by gel permeation chromatography, an I10/I2>6.6, and a composition density less than 0.945 gram/cubic centimeter. The novel composition exhibits high, balanced toughness properties, good processibility and surprisingly improved optical properties and is particularly well-suited for use in applications such as lamination films trash can liners and heavy duty shipping bags, especially as a blown film.
摘要翻译：本发明涉及具有窄分子量分布（MWD）和优化组合均匀性的乙烯互聚物组合物，制备这种组合物的方法和由这种组合物制成的制造制品。该新型组合物的特征在于具有至少两种聚合物组分，第一组分具有ATREF峰温度，Tpeak1和粘均分子量Mv1，第二组分具有ATREF峰温度Tpeak2和粘均分子， Mv2，其中Tpeak2和Tpeak1之间的温差随着组成密度的增加而降低，Mv1 / Mv2小于或等于1.2。该新型组合物的特征还在于通过凝胶渗透色谱法测定的Mw / Mn小于或等于3.3，I10 / I2> 6.6，组成密度小于0.945克/立方厘米。该新型组合物显示出高的平衡的韧性，良好的加工性和令人惊奇的改进的光学性能，特别适用于诸如层压膜垃圾桶衬里和重型运输袋，特别是作为吹塑薄膜的应用。

5. 发明授权

US06908968B2 Narrow MWD, compositionally optimized ethylene interpolymer composition, process for making the same and article made therefrom 有权
标题翻译：窄MWD，组分优化的乙烯互聚物组合物，其制备方法和由其制备的制品
公开(公告)号：US06908968B2
公开(公告)日：2005-06-21
申请号：US10764776
申请日：2004-01-26
申请人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
发明人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
IPC分类号： B65D30/02 , B32B27/32 , C08F2/00 , C08F2/01 , C08F4/60 , C08F4/64 , C08F4/642 , C08F4/659 , C08F4/70 , C08F210/02 , C08F210/16 , C08J5/18 , C08L23/08 , C08L23/06 , C08F4/44 , C08F110/02
CPC分类号： C08L23/0815 , C08F210/16 , C08L2205/02 , C08L2308/00 , C08L2314/06 , C08L2666/04 , C08F210/14 , C08F2500/03 , C08F2500/12 , C08F2500/26 , C08F2/001
摘要： A polymer composition comprises at least two polymer components, the first component having an ATREF peak temperature, Tpeak1, and a viscosity average molecular weight, Mv1, and the second component having an ATREF peak temperature, Tpeak2, and a viscosity average molecular weight, Mv2, wherein the temperature differential between Tpeak2 and Tpeak1 decreases with increased composition density and Mv1/Mv2 is less than or equal to 1.2. the composition is further characterized as having a Mw/Mn of less than or equal to 3.3, an I10/I2>6.6, and a composition density less than 0.945 gram/cubic centimeter.
摘要翻译：聚合物组合物包含至少两种聚合物组分，第一组分具有ATREF峰温度T max 1和粘度平均分子量M 1 v 1，并且第二组分具有ATREF峰值温度T 2峰2和粘度平均分子量M 2 V 2，其中T 2峰2和T 2之间的温差， SUB> peak1 随着组成密度的增加而降低，并且M 1/2 / M 2 V 2小于或等于1.2。该组合物进一步被表征为具有小于或等于3.3的M

6. 发明授权

US06683149B2 Narrow MWD, compositionally optimized ethylene interpolymer composition, process for making the same and article made therefrom 有权
标题翻译：窄MWD，组分优化的乙烯互聚物组合物，其制备方法和由其制备的制品
公开(公告)号：US06683149B2
公开(公告)日：2004-01-27
申请号：US10247025
申请日：2002-09-19
申请人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
发明人： Pradeep Jain , Lonnie G. Hazlitt , Jacquelyn A. deGroot , Kenneth W. Anderson
IPC分类号： C08F11002
CPC分类号： C08L23/0815 , C08F210/16 , C08L2205/02 , C08L2308/00 , C08L2314/06 , C08L2666/04 , C08F210/14 , C08F2500/03 , C08F2500/12 , C08F2500/26 , C08F2/001
摘要： The present invention pertains to an ethylene interpolymer composition characterized as having a narrow molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a composition and a fabricated article made from such composition. The novel composition is characterized as having at least two polymer components, the first component having an ATREF peak temperature, Tpeak1 and a viscosity average molecular weight, Mv1, and the second component having an ATREF peak temperature, Tpeak2, and a viscosity average molecular, Mv2, wherein the temperature differential between Tpeak2 and Tpeak1 decreases with iincreased composition density and Mv1/Mv2 is less than or equal to 1.2. The novel composition exhibits high, balanced toughness properties, good processibility and surprisingly improved optical properties and is particularly well-suited for use in applications such as lamination films trash can liners and heavy duty shipping bags, especially as a blown film.
摘要翻译：本发明涉及具有窄分子量分布（MWD）和优化组合均匀性的乙烯互聚物组合物，制备这种组合物的方法和由这种组合物制成的制造制品。该新型组合物的特征在于具有至少两种聚合物组分，第一组分具有ATREF峰温度，Tpeak1和粘均分子量Mv1，第二组分具有ATREF峰温度Tpeak2和粘均分子， Mv2，其中Tpeak2和Tpeak1之间的温差随着组合物浓度的增加而降低，Mv1 / Mv2小于或等于1.2。该新型组合物显示出高的平衡的韧性，良好的加工性和令人惊奇的改进的光学性能，特别适用于诸如层压膜垃圾桶衬里和重型运输袋，特别是作为吹塑薄膜的应用。

7. 发明授权

US06812289B2 Cast stretch film of interpolymer compositions 有权
标题翻译：互聚物组合物的拉伸膜
公开(公告)号：US06812289B2
公开(公告)日：2004-11-02
申请号：US10200814
申请日：2002-07-22
申请人： Jozef J. I. Van Dun , Jacquelyn A. deGroot , Pradeep Jain , Kalyan Sehanobish , Pak-Wing S. Chum
发明人： Jozef J. I. Van Dun , Jacquelyn A. deGroot , Pradeep Jain , Kalyan Sehanobish , Pak-Wing S. Chum
IPC分类号： C08L2300
CPC分类号： B32B27/32 , Y10S526/943
摘要： This invention relates to cast films prepared from interpolymer compositions comprising; (A) a substantially linear ethylene/&agr;-olefin interpolymer present in the composition in an amount of from about 10 to about 100% by weight based on the combined weight of Components A and B; and (B) a heterogeneous interpolymer present in the composition in an amount of from about 0 to about 90% by weight based on the combined weight of Components A and B; and wherein said interpolymer composition has an I10/I2 value of −1.2−1.3* log(I2) The interpolymer compositions are useful in cast stretch film manufacture with the resulting cast films having an excellent balance of strength and processability.
摘要翻译：本发明涉及由互聚物组合物制备的流延膜，其包含：（A）组合物中基本上线性的乙烯/α-烯烃互聚物，其量为约10至约100重量％，基于组分A和 B; 和（B）基于组分A和B的组合重量，组合物中存在的异构互聚物的量为约0至约90重量％; 并且其中所述互聚物组合物的I 10 / I 2值<约10.0，并且其特征在于具有100rad / s的粘度和满足以下关系之一的弛豫时间（τ）;或所述互聚物组合物可用于铸塑拉伸膜制造出具有优异的强度和加工性能的所得流延薄膜。

8. 发明授权

US5972444A Polyolefin compositions with balanced shrink properties 失效
标题翻译：具有平衡收缩性能的聚烯烃组合物
公开(公告)号：US5972444A
公开(公告)日：1999-10-26
申请号：US748322
申请日：1996-11-13
申请人： Rajen M. Patel , Jacquelyn A. deGroot
发明人： Rajen M. Patel , Jacquelyn A. deGroot
IPC分类号： B29C47/00 , B29C47/02 , B32B27/08 , B32B27/32 , B42D15/00 , C08F4/659 , C08F4/6592 , C08F10/00 , C08F10/02 , C08F110/00 , C08F110/02 , C08F210/16 , C08G83/00 , C08J5/18 , C08L23/02 , C08L23/04 , C08L23/08 , C08L23/16 , B32B7/02
CPC分类号： C08G83/003 , B29C47/0004 , B29C47/0021 , B29C47/02 , B32B27/08 , B32B27/32 , B32B27/322 , B42D15/00 , C08F10/00 , C08F10/02 , C08F210/16 , C08J5/18 , C08L23/04 , C08L23/0815 , C08L23/16 , B29C47/00 , B29C47/0033 , B29K2995/0022 , C08F110/00 , C08F110/02 , C08F4/65908 , C08F4/65912 , C08F4/6592 , C08J2303/08 , C08J2323/08 , C08L2205/02 , C08L23/02 , Y10T428/1334 , Y10T428/139 , Y10T428/24992 , Y10T428/2826 , Y10T428/31913
摘要： This invention relates to an improved shrink film having balanced properties. In particular, this invention relates to a biaxially oriented polyolefin shrink film made from a particular polymer mixture which includes a first ethylene polymer component having a single differential scanning calorimetry (DSC) melting peak or a single Analytical Temperature Rising Elution Fractionation (ATREF) peak and a second ethylene polymer component having one or more DSC melting peaks, wherein the density differential between the two component polymers about 0 to about 0.03 g/cc. Improved properties include increased shrink responses, wide orientation windows, higher modulus and high softening temperatures.
摘要翻译：本发明涉及具有平衡特性的改进的收缩膜。特别地，本发明涉及由特定聚合物混合物制成的双轴取向聚烯烃收缩膜，其包括具有单一差示扫描量热法（DSC）熔融峰或单一分析温度升高洗脱分馏（ATREF）峰的第一乙烯聚合物组分，和具有一个或多个DSC熔融峰的第二乙烯聚合物组分，其中所述两组分聚合物之间的密度差为约0至约0.03g / cc。改进的性能包括增加的收缩反应，宽的取向窗口，更高的模量和高的软化温度。

9. 发明授权

US5231151A Silica supported transition metal catalyst 失效
标题翻译：二氧化硅负载过渡金属催化剂
公开(公告)号：US5231151A
公开(公告)日：1993-07-27
申请号：US854175
申请日：1992-03-20
申请人： Lee Spencer , Brian W. S. Kolthammer , Miriam P. Ripplinger , Jeffrey J. Wooster , Pak-Wing S. Chum , Jacquelyn A. deGroot
发明人： Lee Spencer , Brian W. S. Kolthammer , Miriam P. Ripplinger , Jeffrey J. Wooster , Pak-Wing S. Chum , Jacquelyn A. deGroot
IPC分类号： C08J5/18 , B29C55/02 , B29K23/00 , B29L7/00 , C08F4/646 , C08F4/658 , C08F4/685 , C08F10/00 , C08F210/00 , C08F210/02 , C08F210/16
CPC分类号： C08F10/00 , Y10S428/91 , Y10T428/26 , Y10T428/31855
摘要： A transition metal containing catalyst useful for the polymerization of .alpha.-olefins is prepared by (A) forming in an inert atmosphere which excludes oxygen and moisture a slurry of (1) a porous inorganic oxide support material selected from the group consisting of silica, alumina, or a combination of silica and alumina, said support material containing not greater than about 5 millimoles of hydroxyl groups per gram of support material and a particle size not greater than about 10 microns and a surface area of from about 50 to about 800 m.sup.2 /g in an inert organic liquid medium; (B) mixing said slurry with (2) an alkoxide and stirring the resultant mixture at a temperature of from about -20.degree. C. to about 120.degree. C. for a time sufficient to saturate the surface of the support material; (C) mixing the product form (B) with (3) a titanium compound or a combination of a titanium compound and (4) a vanadium compound and stirring the resultant mixture at a temperature of from about -20.degree. C. to about 120.degree. C. for a time sufficient to allow complete reaction of the titanium compound and the vanadium compound with the organomagnesium moieties remaining on the solid support; (D) mixing the product from (C) with an inert organic solution of (5) a Group IIIA metal alkyl halide at a temperature of from about -20.degree. C. to about 120.degree. C. for a time sufficient to complete the reduction of the titanium and vanadium, if present, compounds to their final oxidation state.
摘要翻译：用于α-烯烃聚合的含过渡金属的催化剂通过以下步骤制备：（A）在惰性气氛中形成不含氧和水分的淤浆（1）多孔无机氧化物载体材料，其选自二氧化硅，氧化铝，或二氧化硅和氧化铝的组合，所述载体材料每克载体材料含有不大于约5毫摩尔羟基，粒度不大于约10微米，表面积为约50至约800平方米/ g在惰性有机液体介质中; （B）将所述浆料与（2）醇盐混合并在约-20℃至约120℃的温度下搅拌所得混合物足以使载体材料表面饱和的时间; （C）将产品形式（B）与（3）钛化合物或钛化合物和（4）钒化合物的组合混合并在约-20℃至约120℃的温度下搅拌所得混合物在足以允许钛化合物和钒化合物与残留在固体载体上的有机镁部分完全反应的时间; （D）将来自（C）的产物与（5）IIIA族金属烷基卤的惰性有机溶液在约-20℃至约120℃的温度下混合足以完成还原的时间的钛和钒（如果存在）化合物达到其最终氧化态。

10. 发明授权

US06306969B1 Shrink film having balanced properties or improved toughness and methods of making the same 失效
标题翻译：具有平衡性能或改善韧性的收缩膜及其制造方法
公开(公告)号：US06306969B1
公开(公告)日：2001-10-23
申请号：US09308142
申请日：1999-05-13
申请人： Rajen M. Patel , Jacquelyn A. deGroot
发明人： Rajen M. Patel , Jacquelyn A. deGroot
IPC分类号： C08L2316
CPC分类号： C08J5/18 , B32B27/32 , B32B27/327 , B32B2250/242 , B32B2270/00 , B32B2307/518 , B32B2307/736 , C08J2323/08 , C08L23/0815 , C08L2205/02 , Y10T428/1352 , C08L2666/04
摘要： This invention relates to an improved shrink film obtained by selectively controlling and optimizing the melt index and density differential between at least two polyolefin polymer components to provide narrow density splits. One aspect of this invention relates to a biaxially oriented polyolefin shrink film having balanced properties and another aspect of this invention relates to an oriented shrink film having improved toughness. This invention also relates to a biaxial orientation method of making an improved shrink film using elaborate shrink orientation techniques such as tenter framing, double-bubble, trapped bubble, tape orientation or combination thereof. Most preferably, the first polyolefin polymer component is a lower density, substantially linear ethylene/&agr;-olefin interpolymer and the second polyolefin polymer component is a higher density, heterogeneously branched ethylene/&agr;-olefin interpolymer.
摘要翻译：本发明涉及通过选择性地控制和优化至少两种聚烯烃聚合物组分之间的熔体指数和密度差以提供窄密度分层而获得的改进的收缩膜。本发明的一个方面涉及具有平衡性能的双轴取向聚烯烃收缩膜，本发明的另一方面涉及具有改进韧性的定向收缩膜。本发明还涉及使用精细的收缩定向技术如拉幅机框架，双气泡，捕获气泡，带取向或其组合来制造改进的收缩膜的双轴取向方法。最优选地，第一聚烯烃聚合物组分是较低密度，基本上线性的乙烯/α-烯烃互聚物，第二聚烯烃聚合物组分是较高密度，非均匀支化的乙烯/α-烯烃互聚物。

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