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A polyethylene composition and articles made therefrom

A composition, polyethylene technology, applied in the field of polyethylene compositions and articles made therefrom, can solve problems such as large scale and static electricity

Active Publication Date: 2015-12-09
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

LDPE compositions provide more improved optics, but polymerization reactors experience greater fouling and static

Method used

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  • A polyethylene composition and articles made therefrom
  • A polyethylene composition and articles made therefrom
  • A polyethylene composition and articles made therefrom

Examples

Experimental program
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Effect test

example

[0046] The following examples illustrate the invention but are not intended to limit the scope of the invention. Inventive Examples 1-5 and Comparative Examples 1-4 were prepared. Reactor conditions and catalyst types for the inventive examples are shown in Table 1A. Table IB provides the reactor conditions and catalyst type for Comparative Example 3. Table 1C provides the reactor conditions and catalyst type for Comparative Example 1, and Table ID provides the reactor conditions and catalyst type for Comparative Example 4. UCAT TM G-150, UCAT TM B-300, UCAT TM B-375 and UCAT TM B-400 catalyst is commercially available from Univation Technologies. The inventive and comparative example resins were stabilized with antioxidants.

[0047] Table 1A

[0048]

[0049] Table 1B

[0050] catalyst

[0051] C 2 Partial pressure, psi

[0052] Table 1C

[0053]

[0054] Table 1D

[0055] catalyst

[0056] STY (space-time yield), lb / ...

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PUM

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Abstract

A polyethylene composition comprising at least 95 percent by weight of the units derived from ethylene; less than 5 percent by weight of units derived from one or more α-olefin comonomers; wherein said polyethylene composition has a density in the range of 0.930 to 0.945 g / cm3, a molecular weight distribution characterized by the ratio of the z-average molecular weight to the weight average molecular weight (Mz / Mw) less than 5, a melt index, I2 (measured at 190°C, 2.16 kg), in the range of 0.08 to 0.5 g / 10 minutes, and a high flow melt index, I21 (measured at 190°C, 21.6 kg), in the range from 10 to 20 g / 10 minutes; and wherein the polyethylene composition is produced utilizing a chromium oxide catalyst is provided

Description

technical field [0001] This invention relates to polyethylene compositions and articles made therefrom. Background technique [0002] Chromium-containing catalysts are generally used to produce polyethylene compositions with higher density, broader molecular weight distribution and fractional melt index. With such properties, good operability is achieved during the polymerization process (eg no fouling in the reactor, low static electricity). Medium density polyethylene compositions tend to maintain good handleability, but also do not exhibit sufficient improvement in optics for such end uses. Low density polyethylene compositions provide more improved optics, but the polymerization reactor experiences greater fouling and static electricity. Contents of the invention [0003] The present invention is a polyethylene composition and articles made therefrom. [0004] In one embodiment, the present invention provides a composition comprising: at least 95% by weight of units...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16
CPCC08F210/16C08F210/14C08F2500/12C08F2500/04C08F2500/26C08F4/24C08F210/02
Inventor M·卡普尔M·戴维斯
Owner DOW GLOBAL TECH LLC