公开(公告)号：DE2302329A1

公开(公告)日：1974-07-25

申请号：DE2302329

申请日：1973-01-18

Applicant: BASF AG

Inventor： MUELLER-TAMM HEINZ DR ,  BUECHNER OSKAR DR ,  GIERTH VOLKER DR ,  WENDLER KLAUS

IPC: C08J3/11 ,  C08J3/12 ,  C08F47/02

Abstract: Reducing the proportion of particles with dia. below 200 m mu in finely divided polyolefins e.g. polyethylene, comprising particles with dia below 3.5 mm, comprises (1) suspending 1 pbe of the polyolefin, in 2-6 pbw of a water-sol, inert, liq. e.g. ethylene glycol; heating the resulting suspension to 2-6.5 degrees C below the melting range of the polymer, maintaining the suspension at that temp. for 5-30, the processing time being of a duration inversely proportional to the working temp; then (2) separating the so-treated polyolefin from the suspension medium; washing with water; and drying. Step (1) is effected under continuous stirring. The resulting dust-free prod. has improved flow characteristics and is free of voids giving mouldings free of cavities.

公开(公告)号：DE2203553A1

公开(公告)日：1973-08-02

申请号：DE2203553

申请日：1972-01-26

Applicant: BASF AG

Inventor： TRIESCHMANN HANS-GEORG PROF DR ,  URBAN FRIEDRICH DR ,  GIERTH VOLKER DR ,  WENDLER KLAUS ,  ZIZLSPERGER JOHANN DR ,  BRUENEMANN HILMAR DIPL-ING

IPC: B29B7/62 ,  B29B1/08

Abstract: The plastics are mixed at high temps. in a shearing gradient, in which the inhomogeneous plastic fusion is fed into the centre of a mixing zone between two parallel circular surfaces equipped with toothed comminuting elements and with >=1 of the circular surfaces rotated to homogenise the fusion at temps. between the m.pt. of >=1 of the plastic components and 350 degrees C.