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Cross-linked Articles of Propylene-Ethylene-Diene Elastomers Prepared with Hydrophobic Coagents

IP.com Disclosure Number: IPCOM000246093D
Publication Date: 2016-May-04
Document File: 9 page(s) / 43K

Publishing Venue

The IP.com Prior Art Database

Abstract

Crosslinked articles comprising propylene-ethylene-diene copolymers are described herein. A coagent, such as 1,7-octadiene or divinyl benzene, can be applied to an article, such as a cast film or fabric. Optionally, a stabilizer can be blended with the coagent for application to the article. Also or instead, a retarder could be blended with the coagent. The coated article can then be crosslinked, for example by e-beaming.

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Cross-linked Articles of Propylene-Ethylene-Diene Elastomers Prepared with Hydrophobic Coagents

Abstract:


Crosslinked articles comprising propylene-ethylene-diene copolymers are described herein. A coagent, such as 1,7-octadiene or divinyl benzene, can be applied to an article, such as a cast film or fabric. Optionally, a stabilizer can be blended with the coagent for application to the article. Also or instead, a retarder could be blended with the coagent. The coated article can then be crosslinked, for example by e-beaming.


I. Applying Coagents to Articles for Crosslinking:

PCT Publication Nos. WO 2009/154866 and WO 2011/041230 describe the use of Sartomer™350, a triacrylate, for enhancing the crosslinking efficiency of propylene-ethylene- diene (PED) elastomers. However, the Sartomer™350 has ester functionalities which are prone to hydrolysis under certain reaction conditions. Additionally, the Sartomer™350 can have a tendency to impart a yellow tinge to end-use articles under certain use conditions. Therefore, it would be desirable to utilize a different type of coagent to overcome these two deficiencies.

Described herein are crosslinked articles comprising PED copolymers that were prepared using a different type of coagent. In this study, two hydrophobic coagents were evaluated: 1, 7- octadiene (1,7-OD) and divinyl benzene (DVB).

Hydrophobic compounds are of more interest to use with polyolefin materials because they can be applied (smeared, coated) onto the article after the article is fabricated, but before crosslinking. For example, a cast film or fabric could be coated and then e-beam crosslinked. By utilizing such a process, a step of compounding the coagent with the polymer can be eliminated and the loss of these volatile additives during the fabrication step can be minimized/eliminated.

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