Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
2007-05-29
2007-05-29
Lu, Caixia (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
C526S160000, C526S165000, C526S134000, C526S348300, C526S116000, C526S943000, C525S245000, C525S247000
Reexamination Certificate
active
10825380
ABSTRACT:
Disclosed is a process for producing branched polymers including at least 50 mol % C3–C40olefins. The process may include: (1) feeding a first catalyst, an activator, and one or more C2–C40olefins into a first reaction zone at a temperature of greater than 70° C. and a residence time of 120 minutes or less to produce a product; (2) feeding the product a second catalyst, and an activator into a second reaction zone at a temperature of greater than 70° C., and a residence time of 120 minutes or less. One of the catalysts should be chosen to produce a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or less. The other catalyst should be chosen to producing a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or more.
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Abhari Ramin
Canich Jo Ann Marie
Jiang Peijun
Johnsrud David Raymond
Sims Charles Lewis
ExxonMobil Chemical Patents Inc.
Lu Caixia
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