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US 12,649,808 B2Granted
Controlled long chain branching in EPDM by post-reactor modification
AssigneeDow Global Technologies LLC
InventorsSantosh S. Bawiskar, Guang Ming Li, Tianzi Huang
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Abstract
The present disclosure provides a process. In an embodiment, the process includes providing a neat ethylene/propy-lene/non-conjugated polyene terpolymer (n-terpolymer) having a Mooney viscosity (ML (1+4) at 125C) less than 100 Mooney units (MU). The process includes exposing the n-terpolymer to electron beam radiation at a dosage from 0.2 megaRad (MRad) to 1.3 MRad. The process includes forming a branched ethylene/propylene/non-conjugated polyene terpolymer (b-terpolymer) having a Mooney viscosity ML (1+4) at 125C from 25 MU to 135 MU.
Claims6
A process comprising:
- providing a neat ethylene/propylene/non-conjugated polyene terpolymer (n-terpolymer) having a Mooney viscosity ML(1+4) at 125° C. less than 100 Mooney units (MU) and a phase angle δ greater than or equal to 41°;
- exposing the n-terpolymer to electron beam radiation at a dosage from 0.2 megaRad (MRad) to 1.3 MRad;
- and
- forming a branched ethylene/propylene/non-conjugated polyene terpolym (b-terpolymer) having a Mooney viscosity ML (1+4) at 125° C. from 25 MU to 135 MU and a phase angle δ from 20° to 39°.
1 more element
Dependencies are inferred from the claim text.