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1. 发明授权

US5849823A Homogeneously branched ethylene .alpha.-olefin interpolymer compositions for use in gasket applications 失效
标题翻译：用于垫片应用的均匀支化的乙烯α-烯烃互聚物组合物
公开(公告)号：US5849823A
公开(公告)日：1998-12-15
申请号：US706476
申请日：1996-09-04
申请人： Lawrence T. Kale , Robert R. Turley , Pradeep Jain , Lonnie G. Hazlitt
发明人： Lawrence T. Kale , Robert R. Turley , Pradeep Jain , Lonnie G. Hazlitt
IPC分类号： C08L23/08 , C09K3/10 , C08K5/20 , C08L23/16
CPC分类号： C09K3/10 , C08L23/0815 , C08L2205/02 , C09K2200/047 , C09K2200/0617 , C09K2200/062
摘要： This application relates to flexible gaskets formed from blends of linear or substantially linear homogeneously branched ethylene/.alpha.-olefin interpolymers and that possess improved processability as well as low temperature resistance and resistance to staining and attack by microbes. Such gaskets do not require formulation other than the addition of color, to produce a functional product. The gaskets of the present invention do not impact negatively on the environment and are also relatively inexpensive to produce.
摘要翻译：本申请涉及由直链或基本上线性均匀支化的乙烯/α-烯烃互聚物的共混物形成的柔性垫片，并且具有改进的加工性以及耐低温性和抗微生物的染色和攻击性。这种垫圈不需要除添加颜色之外的配方以产生功能性产品。本发明的垫圈不会对环境产生不利影响，并且生产也相对便宜。

2. 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。

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

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

5. 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。

6. 发明授权

US06486284B1 Films produced from substantially linear homogeneous olefin polymer compositions 有权
标题翻译：由基本上线性均匀的烯烃聚合物组合物制成的膜
公开(公告)号：US06486284B1
公开(公告)日：2002-11-26
申请号：US09485801
申请日：2000-05-08
申请人： Seema V. Karande , Lonnie G. Hazlitt , Pradeep Jain , Kaelyn Koch , Shih-Yaw Lai , Li-Min Tau
发明人： Seema V. Karande , Lonnie G. Hazlitt , Pradeep Jain , Kaelyn Koch , Shih-Yaw Lai , Li-Min Tau
IPC分类号： C08F21016
CPC分类号： B32B27/32 , B32B2323/046 , B32B2323/10 , B32B2369/00 , C08J5/18 , C08J2323/08 , C08L23/0815 , C08L101/00 , C08L2314/06 , Y10T428/24 , Y10T428/269 , C08L2666/04
摘要： The subject invention provides a film having at least one layer comprising an interpolymer of ethylene and at least one comonomer selected from the group consisting of C3-C20 &agr;-olefins, dienes, and cycloalkenes, wherein the interpolymer is characteried as having a high degree of processability good optical performance, and good mechanical properties. The subject invention further provides film fabrication processes and polymer compositions which are useful in preparing the subject films.
摘要翻译：本发明提供了一种膜，其具有包含乙烯和至少一种选自C 3 -C 20α-烯烃，二烯和环烯烃的共聚单体的互聚物的至少一层，其中所述互聚物的特征在于具有高度加工性好的光学性能，以及良好的机械性能。本发明还提供了可用于制备本发明膜的膜制造方法和聚合物组合物。

7. 发明授权

US06451916B1 Broad MWD, compositionally uniform ethylene interpolymer compositions, process for making the same and article made therefrom 有权
标题翻译：宽MWD，组成均匀的乙烯互聚物组合物，其制备方法和由其制成的制品
公开(公告)号：US06451916B1
公开(公告)日：2002-09-17
申请号：US09943853
申请日：2001-08-31
申请人： Kenneth W. Anderson , Pak-Wing S. Chum , David A. Eversdyk , Lonnie G. Hazlitt , Pradeep Jain , Kalyan Sehanobish , Li-Min Tau
发明人： Kenneth W. Anderson , Pak-Wing S. Chum , David A. Eversdyk , Lonnie G. Hazlitt , Pradeep Jain , Kalyan Sehanobish , Li-Min Tau
IPC分类号： C08F800
CPC分类号： B01J8/0015 , B01J19/2435 , C08F10/02 , C08F110/02 , C08F210/16 , C08J5/18 , C08J2323/08 , C08L23/04 , C08L2205/02 , Y10T428/31909 , Y10T428/31913 , Y10T428/31938 , C08F2/001 , C08L2666/04 , C08F2500/04 , C08F2500/12 , C08F2500/26 , C08F210/14
摘要： The present invention pertains to a continuous process and polymerization system characterized by separate injection of catalyst and make-up feed, an ethylene interpolymer composition characterized as having broad 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 a melt flow ratio, I10/I2, from 8 to 30, a Mw/Mn of greater than 4 as determined by gel permeation chromatography, a melt index, I2, from 0.01 to 1000 grams/10 minutes, preferably greater that 0.1 to 10 grams/10 minutes, and a density less than 0.945 g/cm3. The novel composition exhibits good processibility and improved toughness properties, especially excellent film tear and impact resistance, and is particularly well-suited for use in applications such as high performance trash can liners and heavy duty shipping bags.
摘要翻译：本发明涉及连续工艺和聚合体系，其特征在于分别注入催化剂和补充进料，特征在于具有宽分子量分布（MWD）和优化的组成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成品。该新型组合物的特征在于具有通过凝胶渗透色谱法测定的熔体流动比I10 / I2，8至30，Mw / Mn大于4，熔体指数I 2为0.01至1000克/ 10分钟，优选为0.1〜10克/ 10分钟，密度小于0.945g / cm 3。该新型组合物显示出良好的加工性和改进的韧性，特别优异的膜撕裂和抗冲击性，并且特别适合用于高性能垃圾桶衬里和重型运输袋等应用中。

8. 发明授权

US06319989B1 Broad MWD, compositionally uniform ethylene interpolymer compositions, process for making the same and article made therefrom 有权
标题翻译：宽MWD，组成均匀的乙烯互聚物组合物，其制备方法和由其制成的制品
公开(公告)号：US06319989B1
公开(公告)日：2001-11-20
申请号：US09463207
申请日：2000-01-20
申请人： Kenneth W. Anderson , Pak-Wing S. Chum , David A. Eversdyk , Lonnie G. Hazlitt , Pradeep Jain , Kalyan Sehanobish , Li-Min Tau
发明人： Kenneth W. Anderson , Pak-Wing S. Chum , David A. Eversdyk , Lonnie G. Hazlitt , Pradeep Jain , Kalyan Sehanobish , Li-Min Tau
IPC分类号： C08F800
CPC分类号： C08J5/18 , B01J8/0015 , B01J19/2435 , C08F10/02 , C08F110/02 , C08F210/16 , C08J2323/08 , C08L23/04 , C08L2205/02 , C08F2/001 , C08L2666/04 , C08F2500/04 , C08F2500/12 , C08F2500/26 , C08F210/14
摘要： The present invention pertains to a continuous process and polymerization system characterized by separate injection of catalyst and make-up feed, an ethylene interpolymer composition characterized as having broad molecular weight distribution (MWD) and optimized compositional uniformity, a process for making such a compostion and a fabricated article made from such composition. The novel composition is characterized as having a melt flow ratio, I10/I2, from 8 to 30, a Mw/Mn of greater than 4 as determined by gel permeation chromatography, a melt index, I2, from 0.01 to 1000 grams/10 minutes, preferably greater that 0.1 to 10 grams/10 minutes, and a density less than 0.945 g/cm3. The novel composition exhibits good processibility and improved toughness properties, especially excellent film tear and impact resistance, and is particularly well-suited for use in applications such as high performance trash can liners and heavy duty shipping bags.
摘要翻译：本发明涉及连续工艺和聚合体系，其特征在于分别注入催化剂和补充进料，特征在于具有宽分子量分布（MWD）和优化的组成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成品。该新型组合物的特征在于具有通过凝胶渗透色谱法测定的熔体流动比I10 / I2，8至30，Mw / Mn大于4，熔体指数I 2为0.01至1000克/ 10分钟，优选为0.1〜10克/ 10分钟，密度小于0.945g / cm 3。该新型组合物显示出良好的加工性和改进的韧性，特别优异的膜撕裂和抗冲击性，并且特别适合用于高性能垃圾桶衬里和重型运输袋等应用中。

9. 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。

10. 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.

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