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A crosslinkable polyethylene composition, method of making the same, and articles made therefrom

A technology of cross-linked polyethylene and composition, which is applied in the field of cross-linkable polyethylene composition, and can solve problems such as instability, sweating, side effects of extrusion processing, etc.

Inactive Publication Date: 2010-02-17
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high levels of organic peroxides can lead to a problem known as "sweat-out", which can have adverse effects on the extrusion process and the final product
"Sweating" dust is a potential explosion hazard, fouls filters, and can cause slippage and instability in the extrusion process

Method used

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  • A crosslinkable polyethylene composition, method of making the same, and articles made therefrom
  • A crosslinkable polyethylene composition, method of making the same, and articles made therefrom
  • A crosslinkable polyethylene composition, method of making the same, and articles made therefrom

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preparation example Construction

[0014] The present invention relates to a crosslinkable polyethylene composition, its preparation method, and the products made therefrom.

[0015] The crosslinkable polyethylene composition according to the invention comprises a polyethylene component, a crosslinker and a co-crosslinker. The crosslinkable polyethylene composition may optionally further comprise scorch inhibitors, curing accelerators, stabilizing radicals, one or more conventional additives, mixtures thereof and / or combinations thereof.

[0016] The term "polyethylene" as used in the present invention means a homopolymer of ethylene or a copolymer of ethylene with a small amount of one or more alpha-olefin comonomers having up to 20 carbon atoms and optionally a diene , or mixtures or blends of these homopolymers and copolymers. The mixture may be a mechanical blend or an in situ blend. The alpha-olefin comonomers have fewer than 20 carbon atoms; for example, they can have 3-12 carbon atoms; alternatively, t...

Embodiment 1

[0107] Example 1 was carried out according to the following procedure. Introduce the polyethylene components and co-crosslinkers shown in Tables I-III into the Barbender TM Mixer, blend and compound at 125°C for 3 minutes to form a polyethylene-cocrosslinker blend. Subsequently, the crosslinkers shown in Tables I-III were introduced into the Barbender where the polyethylene-cocrosslinker blend had been formed. TM They were then further compounded at 125°C for 4 minutes in a mixer, thereby forming the crosslinkable polyethylene composition of the present invention. Crosslinking kinetics of crosslinkable polyethylene compositions were determined using MDR at 140°C (simulating mixing / extrusion conditions where scorching is undesirable) and 182°C (simulating vulcanization conditions where rapid and efficient crosslinking is desired), The results are shown in Tables IV and V, respectively.

Embodiment 2

[0108] Example 2 was carried out according to the following steps. Introduce polyethylene components, stable organic radicals and co-crosslinking agents as shown in Tables I-III into Barbender TM In a mixer, blend and compound at 125°C for 3 minutes to form a polyethylene-stabilized organic radical-co-crosslinker blend. Subsequently, a crosslinker as shown in Tables I-III was introduced into the Barbender in which a polyethylene-stabilized organic free radical-cocrosslinker blend had been formed. TM They were then further compounded at 125°C for 4 minutes in a mixer, thereby forming the crosslinkable polyethylene composition of the present invention. Crosslinking kinetics of crosslinkable polyethylene compositions were determined using MDR at 140°C (simulating mixing / extrusion conditions where scorching is undesirable) and 182°C (simulating vulcanization conditions where rapid and efficient crosslinking is desired), The results are shown in Tables IV and V, respectively.

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Abstract

The instant invention is a crosslinkable polyethylene composition, a method of making the same, and articles made therefrom. The crosslinkable polyethylene composition according to instant invention includes a polyethylene component, a crosslinking agent, and a crosslinking coagent. The crosslinking agent is an organic peroxide, and the crosslinking coagent is an alkadiene, alkatriene, or alkatetraene compound comprising at least two terminal carbon-carbon double bonds. The crosslinkable polyethylene composition may, optionally, further include a scorch inhibitor, a cure booster, a stable free radical, one or more conventional additives, blends thereof, and / or combinations thereof. The method for producing a crosslinkable polyethylene composition according to instant invention includes the steps of: (1) providing a polyethylene component; (2) providing a crosslinking agent, wherein the crosslinking agent is an organic peroxide; (3) providing a crosslinking coagent, wherein the crosslinking coagent is an alkadiene, alkatriene, or alkatetraene compound comprising at least two terminal carbon-carbon double bonds; (4) melt blending the a polyethylene component, the crosslinking agent, and the crosslinking coagent at a temperature in the range of less than the decomposition temperature of the crosslinking agent; and (5) thereby forming the crosslinkable polyethylene composition. The article according to instant invention includes the crosslinked product of a polyethylene component; a crosslinking agent, wherein the crosslinking agent is an organic peroxide; and a crosslinking coagent, wherein the crosslinking coagent is an alkadiene, alkatriene, or alkatetraene compound comprising at least two terminal carbon-carbon double bonds.

Description

[0001] Cross References to Related Applications [0002] This application is a non-provisional application claiming the benefits of U.S. Provisional Patent Application No. 60 / 899,485, filed February 5, 2007, entitled "Crosslinkable Polyethylene Compositions, Processes for Making The Same, and Articles Made Therefrom." Priority, the teachings of which are incorporated herein in their entirety as if reproduced in their entirety hereinafter. technical field [0003] The present invention relates to a crosslinkable polyethylene composition, a process for its preparation and articles made therefrom Background technique [0004] The use of crosslinkable polymer compositions to make articles such as cables, pipes, footwear and foams is well known. A crosslinkable polymer composition generally comprises a polymer, a crosslinking agent such as an organic peroxide, an antioxidant and optionally various other additives such as scorch inhibitors and crosslinking accelerators. Crosslin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08K5/14C08K5/01C08L23/04
CPCC08K5/14C08K5/01C08K5/0025C08L51/06C08L23/04C08L2666/02
Inventor 巴拉特·乔达里约翰·克利尔
Owner DOW GLOBAL TECH LLC
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