Patent ID: 6586537
Filing Date: 2003-07-01
Classification: B01J,C08F

Abstract:
Process for manufacturing an olefin polymer composition in at least two polymerization reactors connected in series, in which:(a) at least one olefin is continuously polymerized in a first polymerization reactor in the presence of a diluent (D) and of a catalyst in order to produce a suspension (S) comprising the said diluent (D) and particles of an olefin polymer (A); (b) some of the suspension (S) is drawn off from the reactor; (c) the suspension drawn off is sent into a hydrocyclone separator in which, on the one hand, a stream (F) comprising diluant (D) and, on the other hand, a concentrated suspension (CS) of particles of polymer (A) are formed and separated; (d) the stream (F) is drawn off from the hydrocyclone separator and at least partially recycled to the first polymerization reactor; (e) the concentrated suspension (CS) is drawn off from the hydrocyclone separator and introduced into a subsequent polymerization reactor in which at least one olefin is polymerized in order to form an olefin polymer (B) and to produce a suspension (Sâ€²) comprising the diluant (D) and particles of an olefin polymer composition comprising polymer (A) and polymer (B); (f) the suspension (Sâ€²) is drawn off from the subsequent polymerization reactor and the particles of the olefin polymer composition are separated from the suspension (Sâ€²).