公开(公告)号：US20180362684A1

公开(公告)日：2018-12-20

申请号：US16063321

申请日：2016-12-09

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Yu Feng Wang ,  Cameron Y. Lim ,  Aaron H. Reed

IPC: C08F210/18 ,  C08F2/01 ,  C08F6/10 ,  C08L23/16 ,  B29B7/16 ,  B29B7/74

Abstract: High Mooney viscosity elastomers having low volatiles content, and processes for producing such elastomers, are provided herein. In particular aspects, the elastomers are metallocene-catalyzed elastomers, such as mEPDM elastomers. Processes for producing such elastomers include devolatilization of an elastomer stream comprising such elastomers, using a kneader. The kneader is counterintuitively operated such that the internal agitating paddles rotate at relatively low speeds. It is believed these low speeds help maintain the elastomer stream as a toffee-like composition, preventing the elastomer stream within the kneader from becoming a crumbly composition, which is difficult to devolatilize.