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Polyolefin Based Elastomer Resin Stabilization

IP.com Disclosure Number: IPCOM000244821D
Publication Date: 2016-Jan-19
Document File: 5 page(s) / 108K

Publishing Venue

The IP.com Prior Art Database

Abstract

Discoloration of polyolefins can result from the use of phenolic antioxidants that are included to provide processing stability to the polymer. As the phenolic antioxidants functions, they oxidize to form color bodies that give the articles containing them a discolored appearance. It was observed and reported in this work that removing the antioxidant from the polyolefin based elastomers (PBE) prevents the PBE from discoloring and improves color stability in articles derived from it. Without antioxidant, PBE do not contribute to discoloration when blended with other polyolefins that contain antioxidants. Furthermore, PBE without antioxidant when blended with appropriately stabilized polyolefins leads to products that have similar mechanical properties to products where antioxidants are present in both the PBE/polyolefin blend.

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Polyolefin Based Elastomer Resin Stabilization

Discoloration of polyolefins can result from the use of phenolic antioxidants that are included to provide processing stability to the polymer. As the phenolic antioxidants functions, they oxidize to form color bodies that give the articles containing them a discolored appearance. It was observed and reported in this work that removing the antioxidant from the polyolefin based elastomers (PBE) prevents the PBE from discoloring and improves color stability in articles derived from it. Without antioxidant, PBE do not contribute to discoloration when blended with other polyolefins that contain antioxidants. Furthermore, PBE without antioxidant when blended with appropriately stabilized polyolefins leads to products that have similar mechanical properties to products where antioxidants are present in both the PBE/polyolefin blend.

Background:

In applications where softness is required, nonwoven roll good providers will blend PBE, such as Vistamaxx® Performance Polymer, with polyolefins such as polypropylene to produce a nonwoven with improved aesthetic properties. PBE when blended with polypropylene is known to improve the softness and drape of the nonwoven fabric. Along with the PBE, the polyolefin is likely to contain a phenolic antioxidant. Phenolic antioxidants are found to discolor as they function to protect the polymer during processing or during long term storage. The color bodies generated by these phenolic antioxidants will often cause the resin or article containing them to discolor. This discoloration is a detriment to product appearance, especially when these products are used in hygiene applications.

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