Foamed rubber blend containing and ethylene-propylene-diene poly

Details Foamed rubber blend containing and ethylene-propylene-diene poly Foamed rubber blend containing and ethylene-propylene-diene poly

1997-11-18

1999-10-26

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 82, 521134, 525211, 525232, 525240, C08L 2316, C08J 900

Patent

active

059730170

ABSTRACT:
A foamed rubber blend comprising an EPDM is polymer blend comprising at least one high molecular weight component and at least one low molecular weight component is provided. The high molecular weight component has a weight average molecular weight (Mw) in a range of from about 400,000 to about 800,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 5.5 to about 9.5. The low molecular weight component has a weight average molecular weight (Mw) in a range of from about 150,000 to about 500,000 and a molecular weight distribution index (Mw/Mn) in a range of from about 1.5 to about 5.5. The EPDM rubber has an overall weight average molecular weight (Mw) in a range of from about 200,000 to about 700,000. The ratio of the polymer blend in the foamed rubber blend is in a range of from about 33 wt % to about 60 wt %. The present invention is also directed to an article formed from a sulfur-vulcanized EPDM rubber blend having a compression set according to JIS K 6301 of not more than about 24%.

REFERENCES:
patent: 4212787 (1980-07-01), Matsuda et al.
patent: 4247652 (1981-01-01), Matsuda et al.

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