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PP Formulation and Feeding Format to Improve Process Capability

IP.com Disclosure Number: IPCOM000240161D
Publication Date: 2015-Jan-07
Document File: 3 page(s) / 97K

Publishing Venue

The IP.com Prior Art Database

Related People

Mosha He Zhao: AUTHOR [+4]

Abstract

A polypropylene (PP) resin composition with enhanced process capability to feed high performing nucleator into a homopolymer and/or copolymer of ethylene and propylene to achieve good clarity, stiffness with no post run high crystallization temperature (Tc) effect is disclosed. The polypropylene composition comprises a mixture consisting essentially of from approximately 96 to 99.9% by weight of a polypropylene, from approximately 0.1 to 3% by weight of ethylene, from approximately 0.01 to 1.0% by weight of phosphorous and/or phenolic antioxidant, 0.1 to 2.0% by weight of masterbatch which contains 2 to 30% by weight of acid neutralizer, 2 to 30% by weight of Milliken HPN600ei, 0.001 to 0.5% by weight of phosphorous and/or phenolic antioxidant and 40 to 95% wt. of PP. The formulation for the masterbatch as well as for the PP overall resolved the HPN600ei lingering effect observed earlier. Tc dropped within 15min after the HPN600ei run in non-nucleating PP products, compared with previously with neat additive (no masterbatch), Tc stayed elevated over 100 cars of non-nucleated PP after HPN600ei run.

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PP Formulation and Feeding Format to Improve Process Capability

Mosha Zhao, Tony Poloso, Samie Leigh

Abstract: A polypropylene (PP) resin composition with enhanced process capability to feed high performing nucleator into a homopolymer and/or copolymer of ethylene and propylene to achieve good clarity, stiffness with no post run high crystallization temperature (Tc) effect is disclosed. The polypropylene composition comprises a mixture consisting essentially of from approximately 96 to 99.9% by weight of a polypropylene, from approximately 0.1 to 3% by weight of ethylene, from approximately
0.01 to 1.0% by weight of phosphorous and/or phenolic antioxidant, 0.1 to 2.0% by weight of masterbatch which contains 2 to 30% by weight of acid neutralizer, 2 to 30% by weight of Milliken HPN600ei, 0.001 to 0.5% by weight of phosphorous and/or phenolic antioxidant and 40 to 95% wt. of PP.

The formulation for the masterbatch as well as for the PP overall resolved the HPN600ei lingering effect observed earlier. Tc dropped within 15min after the HPN600ei run in non-nucleating PP products, compared with previously with neat additive (no masterbatch), Tc stayed elevated over 100 cars of non-nucleated PP after HPN600ei run.

Background:

The crystallization temperature (Tc) of differential scanning calorimetry (DSC) was tested based on ASTM D3418 procedure. Normally, non-nucleated polypropylene has a Tc around 110-115 oC. The high performing nucleator has a lingering effect in the finished products later on. After the polymer finishing run with Milliken HPN600ei nucleator, the later non-nucleated grades' Tc remained 8-12oC higher than typical after multiple runs without the nucleator, as shown in Figure 1 (below). This effect was observed in both Extruders A and B.

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