Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1990-10-09
1993-07-20
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526127, 526129, 526282, 526283, 526336, C08F 464, C08F23620
Patent
active
052294781
ABSTRACT:
A process for producing a high molecular weight EPDM elastomer having low crystallinity using a bridged bis-metallocene-alumoxane catalyst wherein the metallocene component of the catalyst has the formula: ##STR1## wherein "M" is titanium, zirconium or hafnium; each "R.sup.1 " independently is a C.sub.1 to C.sub.20 linear, branched or cyclic alkyl group or a C.sub.2 to C.sub.4 alkylene which forms a fused ring system; "R.sup.2 " is a C.sub.1 to C.sub.6 linear, branched or cyclic alkylene group, an alkyl substituted silanylene group or an alkyl substituted silaalkylene group; each "X" independently is a halogen, hydride, alkyl, aryl or chelating group, and "y" is an integer of 2 to 4.
REFERENCES:
patent: 4542199 (1985-09-01), Kaminsky et al.
patent: 4791180 (1988-12-01), Turner
patent: 5001205 (1991-03-01), Hoel
Kiaminsky, "Ethylene Propylene Diene Terpolymers Produced with a Homogeneous and Highly Active Z-rconium Catalyst," J. Poly. Sci., vol. 23, pp. 2151-2164 (1985).
Floyd Sigmund
Hoel Elvin L.
Exxon Chemical Patents Inc.
Kurtzman M. B.
Spiering M. Susan
Teskin Fred
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