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Rheology-modified thermoplatic elastomer compositions and articles fabricated therefrom

A technology of rheology modification and composition, which is applied in the field of manufacturing products and can solve problems such as increased gel content

Inactive Publication Date: 2004-03-03
温本公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And this leads to an increase in the gel content measured with cyclohexane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] Embodiment (EX) 1-3 and comparative example (COMP EX) A-F

[0059]Nine sample compositions were prepared from three different EAO polymers, Ex 1-3 and Comp ExA-F, using the basic procedure to prepare Ex 1-3 and some variations of the basic procedure to prepare CompEx A-F. All samples were prepared by feeding dry polymer pellets into a ZSK 30 millimeter (mm) Werner Pfleiderer co-rotating twin-screw extruder equipped with high shear mixing screw elements. The extruder was run at 250 revolutions per minute (rpm) to efficiently melt process the dried pellets.

[0060] For Ex 1-3 and Comp Ex D-F, the pellets were 75 wt% EAO polymer and 25 wt% PP-1 (a PP homopolymer (Profax® 6231, MFR (230 °C and 2.16 kg weight) at 20 g / 10 min, Both percentages are based on dry blend weight for dry blends available from Himont).

[0061] The EAO polymer that all buys from DuPont-Dow Elastomer United Co., Ltd. is: EAO-1, ​​a kind of having melt index (I 2 ) of 0.5 g / 10 min (190 ° C, 2.12 ki...

Embodiment (E

[0068] Embodiment (Ex) 4-7

[0069] Using EAO-1 and PP-2, 4 additional samples were prepared using the procedure and equipment of Ex 1-3, with the same peroxide content of 1500ppm and 4500ppm instead of 3000ppm, PP content of 15wt% and 35wt% instead of Not 25% by weight. PP-2 (Profax TM 6523, Himont) has an MFR of 4 g / 10 min. Table II summarizes the data for Ex 4-7.

[0070] Ex

[0071] This data shows that the desired properties can be engineered within a considerable range simply by varying the PP and peroxide levels in the EAO / PP blend.

[0072] Embodiment (Ex) 8 and 9

[0073] Using EAO-4 (Engage® 8190, 93 wt% of EAO-3 and 7 wt% of PP-4 (Profax TM 6323, a PP homopolymer with an MFR of 12 g / 10 min, available from Himont) with a bulk density of 0.859 g / cc and I 2 It is 1g / 10min, obtains from DuPont-Dow Elastomer United Co., Ltd.) and PP-4, adopts the procedure and equipment of Ex 1-3 to prepare two other samples, has the same peroxide content of 6000ppm and ...

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Abstract

Rheology-modified TPE compositions are prepared by peroxide modification of a melt blend of an EAO polymer or EAO polymer blend and a high melting polymer such as polypropylene or a propylene / [alpha]-olefin copolymer. The resulting compositions have an elastomeric phase, a non-elastomeric phase and certain physical properties that exceed those of a like composition that is not rheology-modified or of the same composition prior to rheology modification. The compositions can be used to make a variety of articles of manufacture, such as automotive parts, non-automotive parts, roofing membranes, and boot shafts, via conventional procedures.

Description

field of invention [0001] In general terms the present invention relates to rheology modified thermoplastic elastomer (TPE) compositions comprising elastomeric ethylene / alpha-olefin (EAO) polymers or EAO polymer blends and high melting point propylene polymers, It relates to the preparation of such compositions, to the use of such compositions in processes such as profile extrusion and injection molding to produce manufactured articles and to the resulting manufactured articles. In particular, the invention relates to compositions wherein both components are peroxide-modified, to methods of preparing such compositions, for example by using peroxides to modify the physical blend of the components, and to such Use of the composition in the production of manufactured articles including thin-walled articles such as work boot shafts by injection molding, refrigerator gaskets by profile extrusion and sheet extrusion and / or calendering followed by thermoforming car shell. [0002] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/10C08L23/16
CPCC08L23/16C08L23/10C08L2666/04C08K3/013C08J9/04C08K5/14C08L2207/04
Inventor H·G·赫克D·R·帕里克L·B·韦弗J·R·贝西娅L·A·梅斯克M·F·马丁
Owner 温本公司