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Stretch blow-molded containers from metallocene propylene polymer compositions

A technology of propylene polymer and stretch blow molding, applied in the field of stretch blow molding containers, which can solve the problems of expensive PET, consumable materials, and not particularly suitable for containers

Inactive Publication Date: 2007-10-24
BASSELL POLIOLEFINE ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PET is expensive and not particularly suitable for applications where the container must be retorted or for hot-filling applications, which need to include consumable materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0041] Example 1 was prepared by first prepolymerizing Avant ZN 127-1L (a Ziegler Natta catalyst available from Basell USA Inc.) and propylene with a yield of prepolymerized catalyst of about 40 g / g catalyst . The above prepolymerized catalyst and propylene were then continuously fed into the first loop reactor. The homopolymer formed in the first loop reactor and ethylene were fed into the second reactor. The temperature of both loop reactors was 72°C. The polymer is withdrawn from the second reactor, separated from unreacted monomer and dried.

[0042] The obtained polymer contained 60% by weight of a propylene homopolymer having an I.I. of 98.6% by weight, an MFR of 6.8, and 40% by weight of a propylene random copolymer having an ethylene content of 40% by weight. The content is 3.0% by weight, and I.I. is 94.0% by weight. The overall composition had an MFR of 10 dg / min and a molecular weight distribution of 5.1.

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PUM

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Abstract

Stretch blow molded containers produced from a propylene polymer composition produced with a Ziegler Natta catalyst, the propylene polymer composition comprising: A. 25.0 wt % to 65.0 wt% of a homopolymer or minirandom copolymer of propylene containing up to 1.0 wt % of at least one of ethylene and C4-C10a-olefins, having an isotactic index greater than about 80%; and B. 35.0 wt% to 75.0 wt% of a random copolymer of propylene and at least one olefin chosen from ethylene and C4-C10 a-olefins, containing about 0.3 to about 30 wt% of said olefin, and having an isotactic index greater than 60.0%; wherein the propylene polymer composition has a melt flow rate of 1 to 25 and a molecular weight distribution greater than 3.5.

Description

technical field [0001] The present invention relates to stretch blow molded containers prepared from propylene polymer compositions produced with Ziegler Natta catalyst systems. Background technique [0002] Stretch blow molding methods, such as injection stretch blow molding, are widely used to manufacture containers that meet commercial clarity requirements. Polyethylene terephthalate ("PET") is often used in injection stretch blow molding processes because of its desirable transparent properties. However, PET is expensive and not particularly suitable for applications where the container must be retorted or for hot-fill can applications, which need to include consumable materials. [0003] Polypropylene-based containers are more cost-effective than PET-based materials and can be retorted for food and liquid applications. WO 99 / 41293 describes a process for the production of injection stretch blow molded containers from propylene polymers using metallocene catalysts. US...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10
CPCY10T428/1352C08L23/10C08L23/12C08L23/142C08L2205/02C08L2666/04C08L2666/06
Inventor T·C·布拉西尔L·V·罗伯森
Owner BASSELL POLIOLEFINE ITAL SRL