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Improvement of compounding process by adding low molecular weight propylene-based polymers

IP.com Disclosure Number: IPCOM000242932D
Publication Date: 2015-Aug-31
Document File: 6 page(s) / 530K

Publishing Venue

The IP.com Prior Art Database

Abstract

Energy consumption and throughput are two concerns for compounding processes. Lower energy consumption and higher throughput could help compounders create more value with reduced cost and increased productivity. Throughput is normally restricted by melt pressure during the compounding process. So the lower melt pressure, the higher throughput could be achieved. Studies have shown that adding low molecular weight propylene-based polymers to common compounding process allows lower energy consumption and lower melt pressure, and therefore allows for higher throughput.

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Improvement of compounding process by adding low molecular weight propylene-based polymers

Abstract: Energy consumption and throughput are two concerns for compounding processes. Lower energy consumption and higher throughput could help compounders create more value with reduced cost and increased productivity. Throughput is normally restricted by melt pressure during the compounding process. So the lower melt pressure, the higher throughput could be achieved. Studies have shown that adding low molecular weight propylene-based polymers to common compounding process allows lower energy consumption and lower melt pressure, and therefore allows for higher throughput.

Background:


Traditionally, processing aids (like polyolefin-based wax, stearates or oil) are added to the compounding process to reduce energy consumption and increase throughput. However, these small molecules might affect properties of the final compound and migrate to surface of the end- use products, which affects the appearance and post-fabrication treatment of the end-use products (e.g., printing, surface finishing).

Development:


Low molecular weight propylene-based polymers have low viscosity due to ultra-low molecular weight. Furthermore, such polymers are polyolefin based materials, and thus have good compatibility with polyolefin compounds. So adding a low molecular weight propylene-based polymer component can reduce the energy consumption and melt pressure without introducing the issue for end-use products mentioned above due to migration.

The value of energy saving and melt pressure reduction by introducing low molecular weight propylene-based polymers (PBPs) are not only observed on the continuous compounding process (e.g., by twin-screw extruder) but also on the batch mixing process (e.g., by Brabender mixer).

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