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Polyethylene molding compositions for injection molding applications

A molding composition, ethylene polymer technology, applied in the field of polyethylene molding composition for injection molding applications, can solve the problems of unsatisfactory, achieve good dimensional and shape stability, low shrinkage Effect

Inactive Publication Date: 2009-02-04
BASELL POLYOLEFINE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] With regard to the combined property profile of good flow and high mechanical strength as well as good optical properties, the known molding compositions are still somewhat unsatisfactory

Method used

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  • Polyethylene molding compositions for injection molding applications
  • Polyethylene molding compositions for injection molding applications
  • Polyethylene molding compositions for injection molding applications

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0215] Preparation of individual components

[0216] Bisindenyl zirconium dichloride and methylene bis(tetrahydroindenyl) zirconium dichloride are available from Crompton.

[0217] Carrier pretreatment

[0218] XPO-2107 (ie, spray-dried silica gel from Grace) was baked at 600°C for 6 hours.

example 1

[0220] Preparation of mixed catalyst systems

[0221] A mixture of 39.2 g of bisindenyl zirconium dichloride and 51.2 g of ethylene bis(tetrahydroindenyl) zirconium dichloride was dissolved in 5.2 l of MAO solution in toluene (4.75M in toluene, Albermarle) and stirred 60 minutes. While stirring, the solution was sprayed over 30 minutes onto 4 g of silica gel (XPO 2107, calcined at 600° C. for 6 hours). The line was rinsed with 0.5 1 of toluene. After stirring for an additional 1 hour at room temperature, the catalyst was packaged. 9.45 kg of catalyst system were obtained. The residual moisture content is 44.7% by weight based on the finished catalyst (based on the total weight and calculated on the total coating of all components on the support), the Al content is 6.1 g per 100 g of finished catalyst and the Zr content is 0.23 per 100 g of finished catalyst g.

[0222] polymerization

[0223] Ethylene-hexene copolymers were prepared using the catalyst system of Example 1...

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Abstract

Provided are monomodal molding compositions based on polymers of ethylene, wherein the density of the molding compositions is in the range from 0.940 to 0.96 g / cm<3>, the Mi is in the range from 0.5 to 10.0 g / 10 min. the polydispersity Mw / Mn is in the range from 3 to 20, the branches / 1000 carbon atoms is in the range from 0.1 to 10 and the weight average molar mass Mw is in the range from 50 000 g / mol to 150 000 g / mol, and also injection-molded shaped bodies as well as screw closures comprising the molding compositions.

Description

technical field [0001] The present invention relates to unimodal molding compositions based on ethylene polymers, wherein the molding composition has a density of 0.940 g / cm 3 to 0.96g / cm 3 range, MI in the range of 0.5 g to 10.0 g per 10 min, polydispersity index M w / M n In the range of 3 to 20, the number of branches per 1000 carbon atoms in the range of 0.1 to 10 and the weight average molar mass M w In the range of 50 000 g / mol to 150 000 g / mol. [0002] The invention further relates to injection molded bodies and screw closures comprising the molding composition described above. Background technique [0003] Blends based on ethylene polymers (hereinafter referred to as polyethylene blends) are known and are used, for example, as described in DE-C 3437 116 for producing shaped bodies resistant to environmental stress cracking. [0004] In recent years, all types of screw closures are being manufactured using polyethylene blends by means of plastic injection molding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02
CPCC08F4/65927C08F4/65912C08L23/06C08L2207/07C08F210/16C08F10/00C08F4/65916C08F4/65925C08F10/02C08L2314/06C08L2205/02C08F4/65904C08L2666/06C08F210/14C08F2500/12C08F2500/09B65D41/04
Inventor 珍妮弗·基普克沙赫拉姆·米汉雷纳·卡赖尔
Owner BASELL POLYOLEFINE GMBH