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Heterophasic polymer composition providing high sealing strength

A technology of multiphase polymer and composition, applied in the direction of packaging item types, special packaging items, synthetic resin layered products, etc., can solve the problem that the impact strength is not the highest

Active Publication Date: 2011-06-08
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The known weakness of impact-modified polypropylene materials in terms of their tightness properties after the sterilization step, especially at higher rubber loads, limits their use to small containers or bags (typically less than 500 g), i.e., in terms of impact strength The above requirements are not the application of the highest aspect

Method used

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  • Heterophasic polymer composition providing high sealing strength

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Experimental program
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Effect test

Embodiment

[0097] test methods

[0098] 1. Mw, Mn, MWD

[0099] Mw / Mn / MWD was determined according to Gel Permeation Chromatography (GPC) as follows:

[0100] The weight average molecular weight Mw and the molecular weight distribution (MWD=Mw / Mn, where Mn is the number average molecular weight and Mw is the weight average molecular weight) are determined by a method based on ISO 16014-1:2003 and ISO 16014-4:2003. A Waters Alliance GPCV 2000 equipment equipped with a refractive index detector and an online viscometer was used with 3 TSK-gel columns (GMHXL-HT) from TosoHaas, and 1,2,4-trichlorobenzene (TCB, with 200mg / L of 2,6-di-tert-butyl-4-methyl-phenol stabilized) was used as a solvent, and 216.5 μL of sample solution was injected at a constant flow rate of 1 mL / min at 145 °C for each analysis. The column set was calibrated using 19 polystyrene (PS) relative standards with narrow molecular weight distributions ranging from 0.5 kg / mol to 11500 kg / mol and a set of well characterized ...

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Abstract

The present invention relates to a heterophasic polymer composition, comprising (i) a propylene copolymer matrix, wherein the propylene copolymer comprises comonomer units derived from ethylene and from a C4 to C12 alpha-olefm, (ii) an elastomeric ethylene / propylene / C4 to C12 alpha-olefm copolymer which is dispersed within the matrix; the heterophasic polymer composition having a xylene cold soluble fraction of at least 10 wt%, and the xylene cold soluble fraction having an amount of propylene-derived monomer units of at least 60 wt%.

Description

technical field [0001] The present invention relates to a heterophasic polymer composition useful for the preparation of sterilizable containers such as retort pouches or medical packaging. Background technique [0002] There is a rising trend in the use of plastic containers in the food packaging industry, notably bags containing sterilized or pre-cooked food. Retort pouches offer many advantages over rigid metal packaging containers such as faster cook / sterilize times, less shelf storage space, easier placement, improved food taste, and more. A typical bag has: a multi-layer structure with polyolefin such as polyethylene or polypropylene, adhesive, barrier layer and outer layer. It is desirable that the polyolefin material impart rigidity and high impact strength to the final packaging material. Furthermore, the polymer should comply with legal requirements regarding safety standards, such as FDA (US Food and Drug Administration) regulations regarding hexane soluble cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/16C08L23/08C08J5/18
CPCC08J2323/14C08J2323/16C08J5/18C08L23/142C08L23/16C08J2323/08C08L23/0815B32B27/32B32B27/327B32B2274/00B32B2307/558B32B2439/00C08F210/06C08J2423/16C08L2666/06C08F2/001C08F210/08C08F210/16C08F2500/12C08F2500/27C08F2500/34C08F2500/35C08F2500/36C08F2500/17C08F2500/26
Inventor 克里斯泰勒·格赖因迪特里希·格洛格尔托尼娅·舍德尼奇
Owner BOREALIS AG
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