Heterogeneous, compositionally phase separated, ethylene alpha-olefin interpolymers
A technology of olefin copolymerization and ethylene, which is applied in the field of preparation of the copolymer, can solve the problems of low film haze and high gloss, lack of single resin, loss of processing ability, etc., and achieve the goal of improving physical properties, improving processability and improving performance Effect
Inactive Publication Date: 2009-02-04
DOW GLOBAL TECH LLC
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Problems solved by technology
Although the prior art is replete with various products and manufacturing techniques employing Ziegler / Natta catalysts for the preparation of ethylene copolymers, these known methods are still lacking in the preparation of a single polymer with good toughness, good processability and improved optical properties. Resin Required Capabilities
That is, known vinyl resins, including single reactor products, and even multi-reactor products or polymer blends, still do not exhibit the desired balance of good processability (expressed as facilitating extrusion processing to avoid problems such as those currently Very high demands on blown film making extruders with sufficient melt strength to allow for things such as good bubble stability to maximize output rates); well-balanced tear resistance; good tensile and Impact properties; low film haze and high gloss
[0003] Conventional approaches to achieving improved toughness in ethylene interpolymers include producing products with narrow molecular weight distributions due to the fact that broad molecular weight distributions are known to lead to reduced toughness
Additionally, it is known that linear ethylene homopolymers provide improved toughness relative to multi-armed LDPE at the expense of processability
Method used
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[0017] All references to the Periodic Table herein refer to the Periodic Table of the Elements published and copyrighted by CRC Press, Inc. in 2003. Also, any reference to groups refers to the groups as reflected in the Periodic Table of the Elements using the IUPAC system for group numbering. For purposes of U.S. patent practice, the contents of any patent, patent application, or publication referenced herein are hereby incorporated by reference (or the U.S. equivalent thereof) in their entirety, particularly with respect to synthetic techniques, definitions, and what is known in the art. Public content of common sense. All parts and percentages are expressed by weight unless otherwise indicated, customary in the art, or implied by context.
[0018] The term "comprising" and its derivatives are not intended to exclude the presence of any additional components, steps or methods, whether disclosed herein or not. In order to avoid any doubt, by use of the term "comprising" all...
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Abstract
The present invention pertains to a heterogeneous ethylene / alpha-olefin copolymer having a relatively high melt index range (I2 from 1.1 to 1.6 dg / min.), low density (0.915 to 0.919 g / cc) and narrow molecular weight distribution (I10 / I2 from 7.0 to 7.7), and highly separated composition distribution as determined by SCBD; a process for making such a copolymer; blends thereof with additional polymers; and fabricated articles, especially films, made therefrom.
Description
technical field [0001] The present invention relates to a heterogeneous ethylene / α-olefin copolymer having a relatively high melt index, low density, narrow molecular weight distribution and highly separated composition distribution as determined by CRYSTAF or ATREF analysis. The invention also relates to methods of making the copolymers, blends of the copolymers with other polymers and articles made from all of the above. The novel copolymers exhibit improved toughness, adhesion and good processability. In addition, films made from the resin and blends incorporating the resin exhibit improved optical and tear properties, making them particularly suitable for use in applications such as trash can liners, laminated films, oriented shrink films and bags, outer packaging Film and heavy duty transport bags, especially blown film applications. Background technique [0002] Heterogeneous polymers of ethylene copolymerized or interpolymerized with at least one unsaturated comonom...
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IPC IPC(8): C08F210/16C08J5/18
CPCC08J5/18C08F210/16C08J2323/08C08F210/14C08F2500/12C08F2500/19C08F2500/05C08F2500/03
Inventor J·涅托H·哈根
Owner DOW GLOBAL TECH LLC