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High melt strength polypropylenes with improved processability

A melt strength, linear polypropylene technology, applied in the field of blends of polypropylene and low molecular weight polyolefin, can solve the problem of reducing strain hardening

Pending Publication Date: 2019-09-17
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the challenge with this approach is that higher concentrations of low molecular weight additives reduce strain hardening

Method used

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  • High melt strength polypropylenes with improved processability
  • High melt strength polypropylenes with improved processability
  • High melt strength polypropylenes with improved processability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0095] The characteristics of the invention are demonstrated by the following non-limiting examples. First, the test methods and experimental procedures are described.

[0096] MFR. ASTM D1238, at 230°C, using a 2.16 kg load.

[0097] Molecular weights were determined using DRI (GPC-3D). This method describes two different methods for determining the molecular weight moments of the polymers described herein (as noted, the so-called "GPC-3D" method and the "GPC-4D" method, Each method is based on gel permeation chromatography (GPC), but uses a different detection method than the first. In the GPC-3D method, the number average molecular weight (Mn) value is determined by using high temperature gel permeation chromatography (Agilent PL-220), which is equipped with three online detectors, differential refractive index detector (DRI), light scattering ( LS) detector and viscometer. Three Agilent PLgel 10 μm Mix-B LS columns were used. The nominal flow rate is 0.5 mL / min, and ...

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Abstract

A polypropylene composition suitable for foaming having improved processability but maintained strain hardening and the process to produce the polypropylene composition comprising combining a linear polypropylene having a melt strength within a range from 10 to 40 cN (190DC) with an organic peroxide to obtain a branched polypropylene having a melt strength within a range from 20 to 80 cN (190DC), wherein the melt strength of the branched polypropylene is greater than the melt strength of the linear polypropylene; and combining the branched polypropylene having a melt flow rate within a range of 0.1 to 20 g / 10 min and an Mw / Mn of at least 5 with within a range from 5 to 40 wt% of a low molecular weight polyolefin having a melt flow rate of at least 50g / 10 min and an Mw / Mn of less than 5 to obtain the polypropylene composition.

Description

[0001] priority claim [0002] This application claims the benefit of Provisional Application No. 62 / 455707, filed February 7, 2017, and European Application No. 17160477.0, filed March 13, 2017, the disclosures of which are incorporated herein by reference. [0003] field of invention [0004] This invention relates to improved processing of branched polypropylene, and in particular to blends of branched polypropylene and low molecular weight polyolefins. [0005] Background of the invention [0006] The applicability of polypropylene in industrial extrusion processes involving both shear and extensional flow has been limited. This is due in part to its low melt strength and lack of strain hardening. The industry has tried various options to improve the melt strength and strain hardening of polypropylene, including increasing the molecular weight, broadening the molecular weight distribution (Mw / Mn), adding ultra-high molecular weight tails and / or adding long chain branching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/06C08J9/00C08F8/06B29C48/04
CPCC08L23/12C08L2205/025C08J9/0061C08J2323/12C08J2423/12C08L23/06C08F8/06C08F2500/11C08F2500/12C08J9/02C08J2201/03
Inventor S·P·施密特G·J·佩尔特
Owner EXXONMOBIL CHEM PAT INC
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