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Synergistic Effect of Vistamaxx™ Performance Polymers and LLDPE Resulted in Balanced Properties for Impact Copolymer (ICP) Compounds

IP.com Disclosure Number: IPCOM000240662D
Publication Date: 2015-Feb-16
Document File: 5 page(s) / 340K

Publishing Venue

The IP.com Prior Art Database

Abstract

Blush or stress whitening, is a phenomenon, while under stress conditions the impacted area of ICP becomes white and visible. Vistamaxx™ performance polymer and linear low density polyethylene (LLDPE) were blended together to modify an ICP. The synergistic effect was observed. Stress whitening was reduced and impact performance was improved. Mechanical properties are tailorable by adjusting a combination of LLDPE and Vistamaxx™ performance polymer to meet end product properties. A prediction tool was developed to predict the properties of each formulation within the design boundary on a spread sheet.

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Synergistic Effect of Vistamaxx™ Performance Polymers and LLDPE Resulted in Balanced Properties for Impact Copolymer (ICP) Compounds

Abstract: Blush or stress whitening, is a phenomenon, while under stress conditions the impacted area of ICP becomes white and visible. Vistamaxx™ performance polymer and linear low density polyethylene (LLDPE) were blended together to modify an ICP. The synergistic effect was observed. Stress whitening was reduced and impact performance was improved. Mechanical properties are tailorable by adjusting a combination of LLDPE and Vistamaxx™ performance polymer to meet end product properties. A prediction tool was developed to predict the properties of each formulation within the design boundary on a spread sheet.

Background

Stress whitening is a common phenomenon that happens to molded parts of an ICP during manufacturing, packaging, shipping, and the normal use of the finished consumer goods. LLDPE was commonly blended in compounding to reduce stress whitening of the ICP compounds. The effect was somehow limited and complete elimination of blush seems not possible. It is probably due to the poor compatibility of LLDPE and ICP. This study is in search of an innovative solution to improve the compatibility of compound systems with reduced stress whitening and improved impact performance by incorporatingVistamaxx™ performance polymer, a copolymer of propylene and ethylene sold by ExxonMobil Chemical Company, into blends of LLDPE and ICP. By employing the Design of Experiment software - Design Expert
8.0 from Stat-ease Inc., a systematic DOE study was conducted to investigate the effect of Vistamaxx™ performance polymer and/or LLDPE in ICP modification.

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