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Transparent thin-wall packaging material with improved stiffness and flow

A technology of haze and resin, which is applied in the field of producing the heterogeneous polypropylene resin, can solve the problems of harmful impact strength and achieve the effects of high fluidity and excellent processability

Active Publication Date: 2017-05-31
BOREALIS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, small particles are detrimental to low temperature impact strength, since cracks are the dominant deformation mechanism at low temperatures

Method used

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  • Transparent thin-wall packaging material with improved stiffness and flow
  • Transparent thin-wall packaging material with improved stiffness and flow
  • Transparent thin-wall packaging material with improved stiffness and flow

Examples

Experimental program
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Embodiment

[0140] The polymer is produced in four reactors connected in series. The properties of the products obtained from the various reactors described are given in Table 1. In the example described, the first component has been produced in a loop reactor and components 2 to 4 have been produced in a gas phase reactor.

[0141] The properties of the products obtained from each of said reactors are naturally not measured on homogeneous materials, but on reactor samples (spots). The properties of the final resin are measured on the homogeneous material and the MFR is measured on the pellets made from it 2 .

[0142] The catalyst used for the polymerization process was the commercially available BCF20P catalyst of Borealis (1.9 wt. % of Ti-Ziegler-Natta-catalyst).

[0143] The Al / donor D ratio is 5 mol / mol.

[0144] Table 1:

[0145]

[0146]

[0147] *MFR is measured after each reactor. That means the MFR of Reactor 1 and the overall MFR are measured values. The value for...

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PUM

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Abstract

Heterophasic polypropylene resin having a MFR (2.16 kg, 230° C.) determined according to ISO 1133 of greater than 27 g / 10 min, comprising a propylene homopolymer or copolymer matrix (A) and ethylene-propylene rubber dispersed in said matrix Phase (B), wherein the heterophasic polypropylene resin has an amount of insoluble components (XCU) in p-xylene at 25° C. of 110‑190 kg / mol according to ISO 16014‑1 and 16014‑4, the weight average molecular weight measured by GPC analysis, the insoluble component (XCU) of p-xylene at 25° C. contains monomer units derived from ethylene in an amount of 12.0 wt % to 21.0 wt %, and 15 wt % The soluble fraction (XCS) of p-xylene at 25° C. in an amount of % to 25 wt %, which has an intrinsic viscosity determined according to DIN EN ISO 1628‑1 and 1628‑3 of 1.4 to 2.0 dl / g, and is determined by Composed of propylene monomer units in an amount of 40 wt% or more and having a glass transition temperature Tg measured by DSC according to ISO 6721-7 on compression molded samples of the XCS composition in the range of -60 to -50°C.

Description

technical field [0001] The present invention relates to a high-fluidity heterogeneous polypropylene resin, which comprises a propylene homopolymer or copolymer matrix and an ethylene-propylene rubber phase and an ethylene homopolymer or copolymer dispersed in the matrix. Shows a good balance between toughness, high impact strength at low temperatures and low haze. The invention also relates to a process for producing said heterophasic polypropylene resin. Background technique [0002] It is challenging to develop a highly flowable and rigid heterophasic copolymer (HECO) for transparent thin wall packaging applications that exhibits high impact strength at low temperatures required for ice cream packaging. Transparency requires small particles that do not scatter light. However, small particles are detrimental to low temperature impact strength, since cracking is the dominant deformation mechanism at low temperatures. Large particles are required to induce cracks. A solut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00C08F10/06C08L23/12C08L23/14
CPCC08L23/12C08L23/142C08L2205/02C08L2205/025C08L2207/02C08L2308/00C08L2314/02C08L23/16C08F210/06C08F210/16C08F2500/12C08F2500/21C08F2500/26C08F2/001C08L19/00C08L23/10C08L2201/10C08L2314/00
Inventor 科尔内利娅·特拉宁格
Owner BOREALIS AG