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Propylene-Based Elastomer for EPDM Modification

IP.com Disclosure Number: IPCOM000238117D
Publication Date: 2014-Aug-01
Document File: 4 page(s) / 29K

Publishing Venue

The IP.com Prior Art Database

Abstract

Propylene-based elastomers, such as Exxon™ IT0316, can be blended with EPDM compounds to improve processing behavior of high/medium viscosity compounds, especially in the extrusion process. Exxon IT0316 is a low MW semi-crystalline alpha-olefin polymer which can be used as rubber compound processing aid, in particular in extrusion. Lab evaluation substantiated that IT0316 has potential to improve extrusion speed, reducing die swell, while maintaining good elastomeric properties.

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Propylene-Based Elastomer for EPDM Modification

Abstract: Propylene-based elastomers, such Exxon™ IT0316, can be blended with EPDM compounds to improve processing behavior of high/medium viscosity compounds, especially in the extrusion process. Exxon IT0316 is a low MW semi-crystalline alpha-olefin polymer which can be used as rubber compound processing aid, in particular in extrusion. Lab evaluation substantiated that IT0316 has potential to improve extrusion speed, reducing die swell, while maintaining good elastomeric properties.

Background:

EPDM is used in weatherseal and hose applications to a large extent. These products are pre- formed using extrusion processes and are cured thereafter by continuous vulcanization processes, such as microwave, salt bath, or hot air oven, or by batch processes, such as in steam autoclaves. We studied the effect of blending propylene-based elastomers, such as Exxon™ IT0316, at 5 to 15 phr ratio in an EPDM compound formulation typical of the above applications. One objective was to improve extrusion processing taking advantage of the thermoplasticity of the propylene-based elastomer, in relation with its molecular structure characterized by low propylene crystallinity and a low melting temperature at about 60 °C.

Exxon IT0316 has no diene and thus will not vulcanize by sulfur. The addition of IT0316 thus could impair the cure state, and therefore impair the physical and set properties of the final formulation. This study aims at optimizing the IT0316 dosage in an EPDM formulation to offer the best balance of cure and processing properties.

Mooney Viscosity

ML(1+4)@ 125C

Ethylene content

ENB content

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