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Ethylene/propylene/nonconjugated diene interpolymer composition

A non-conjugated polyene and interpolymer technology, applied in the field of ethylene/propylene/non-conjugated diene interpolymer composition, can solve the problems of low foam expansion rate and rough surface quality of foam

Pending Publication Date: 2022-01-07
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional EPDM foams are limited due to low foam expansion and rough foam surface quality

Method used

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  • Ethylene/propylene/nonconjugated diene interpolymer composition
  • Ethylene/propylene/nonconjugated diene interpolymer composition
  • Ethylene/propylene/nonconjugated diene interpolymer composition

Examples

Experimental program
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[0129] 1. Synthesis of Experimental EPDM

[0130] continuous polymerization

[0131] Polymerization reactions are carried out under steady state conditions, ie, constant reactant concentrations and continuous input of solvent, monomer and catalyst and constant withdrawal of unreacted monomer, solvent and polymer. The reactor system was cooled and pressurized to prevent the formation of a gas phase. Monomers: ethylene (CAS 74-85-1); propylene (CAS 115-07-1); 5-ethylidene-2-norbornene, ENB (CAS 16219-75-3).

[0132] The polymer composition was prepared in a solution polymerization process using two reactors, (i) a continuous stirred tank reactor ("first reactor") followed by (ii) a loop reactor (second reactor). Ethylene was introduced into a mixture of ISOPAR E solvent (available from ExxonMobil), propylene was introduced and 5-ethylidene-2-norbornene (ENB) was introduced, each forming a reactor feed stream.

[0133] Catalyst A was fed into the first reactor and catalyst A w...

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Abstract

The present disclosure provides a composition. The composition can be formed into a foam composition. In an embodiment, the composition includes a neat ethylene / propylene / nonconjugated polyene interpolymer. The neat ethylene / propylene / nonconjugated polyene interpolymer includes from greater than 6.0 wt% to 15.0 wt% nonconjugated polyene. The neat ethylene / propylene / nonconjugated polyene interpolymer has the following properties: (i) a molecular weight (Mw) from 240,000 to 270,000; (ii) a Mooney viscosity (ML (1+4), 125DEG C) from 85 to 95; (iii) a rheology ratio (RR) from 35 to 65; (iv) a Mw / Mn from 2.2 to 3.5; and (v) a Mw < 1389.6 [g / mole] MV + 140,000 g / mol wherein Mw is the weight average molecular weight and MV is the Mooney Viscosity (ML 1+4, 125DEG C). MV is the Mooney Viscosity (ML 1+4, 125DEG C), and Mw is the weight average molecular weight, as determined by conventional GPC.

Description

Background technique [0001] Ethylene-propylene-non-conjugated polyene terpolymers (also known as "EPDM") are widely used in many automotive and industrial applications. For example, EPDM foam is used in automotive sealing applications. However, conventional EPDM foams are limited due to low foam expansion and rough foam surface quality. [0002] The art recognizes a continuing need for new EPDM compositions having higher molecular weights to provide improved foam expansion, extrudate surface smoothness, high physical properties, and shape retention during extrusion. The art further recognizes the need for new foam compositions made from such EPDM compositions. Contents of the invention [0003] The present disclosure provides an EPDM composition. The EPDM composition exhibits high molecular weight, high Mooney viscosity for improved foaming characteristics and foam physical properties. The present disclosure also provides a foam composition made from the EPDM composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16
CPCC08L23/083C08L2205/025C08F210/18C08F2/06C08F4/64193C08F2/14C08F2/001C08J2323/16C08F2500/17C08F2500/27C08F2500/28C08J9/00C08J2323/08
Inventor 吴晓松C·里皮善J·C·图博可亚韩涛李光明
Owner DOW GLOBAL TECH LLC