公开(公告)号：DE2722034A1

公开(公告)日：1978-11-23

申请号：DE2722034

申请日：1977-05-16

Applicant: BASF AG

Inventor： BUECHNER OSKAR DIPL CHEM DR ,  GIERTH VOLKER DIPL CHEM DR

IPC: C08F6/00 ,  C08F2/34 ,  C08F6/04 ,  C08F6/06 ,  C08F10/00 ,  C08F10/02 ,  C08F110/02 ,  C08F212/02 ,  C08F2/36

Abstract: A process for the continuous high pressure polymerization Or ethylene in a polymerization system which comprises a polymerization zone (A) a high pressure product isolation zone (B), a throttling and control system (C), a low pressure product isolation zone (D), a second throttling and control system (E) and a discharge extruder (F), and wherein, according to the invention, the level Or the ethylene polymer in the high pressure product isolation zone (B) and in the low pressure product isolation zone (D) is carried periodically. The process gives an ethylene polymer Or improved homogeneity, which when used to manufacture films does not tend to form specks or fisheyes.

公开(公告)号：DE2442230A1

公开(公告)日：1976-03-18

申请号：DE2442230

申请日：1974-09-04

Applicant: BASF AG

Inventor： BUECHNER OSKAR DIPL CHEM DR ,  GIERTH VOLKER DIPL CHEM DR ,  POHL WALTER ING GRAD ,  MUELLER SIEGFRIED ING GRAD

IPC: B29C47/00 ,  B29C47/80 ,  B29B1/10

Abstract: Polyethylene film is prepd. by homogenising polyethylene of density 0.916-0.932 g/cm3 and melt index 0.05-1g/10, mins. with 50-400 ppm peroxide in an extruder having sepn. of 0.1-0.5 mm between the screw(s) (themselves) and the stationary part. the ratio of minimal sepn. between moving part(s) and stationary or other moving parts:length of area of narrow slit regions in the flow direction lies in the range of 10-2-10-5. The films have high strength and low blocking props. and may be used in the sack making industry.

公开(公告)号：DE2608023A1

公开(公告)日：1977-09-08

申请号：DE2608023

申请日：1976-02-27

Applicant: BASF AG

Inventor： BUECHNER OSKAR DIPL CHEM DR ,  GIERTH VOLKER DIPL CHEM DR ,  MUELLER SIEGFRIED ING GRAD ,  WENDLER KLAUS ING GRAD ,  POHL WALTER ING GRAD

IPC: C08K3/30 ,  C08L23/06 ,  B65D65/38 ,  C08J5/18 ,  C08K3/24

Abstract: Film for making heavy duty sacks 150-300 mu thick is made from (a) polyethylene with a density of 0.915-0.935 g/cm3 and a melt index of 0.05-50g/10 min. and (b) 0.05-0.5 wt.% (on a) of calcium sulphate powder with an av. particle size of >10 (10-90)mu. Pref. the calcium sulphate contains at most 1/2 mol. water of crystallisation per mol calcium sulphate. The films have good anti-blocking properties and pleasant texture, and can be used in packing equipment without breakdown in prodn. Compared with SiO2-filled films, they have reduced tendency to yellowing and optical defects.

公开(公告)号：DE2814572A1

公开(公告)日：1979-10-18

申请号：DE2814572

申请日：1978-04-05

Applicant: BASF AG

Inventor： ZEITLER GERHARD DIPL CHEM DR ,  PAATZ RUDOLF DIPL CHEM DR ,  GIERTH VOLKER DIPL CHEM DR ,  MOORWESSEL DIETER DIPL CHEM DR ,  SCHOENE WERNER DIPL CHEM DR

IPC: C08F6/00 ,  C08F6/28 ,  C08F10/00

公开(公告)号：DE2510697A1

公开(公告)日：1976-09-23

申请号：DE2510697

申请日：1975-03-12

Applicant: BASF AG

Inventor： BUECHNER OSKAR DIPL CHEM DR ,  GIERTH VOLKER DIPL CHEM DR ,  MUELLER-TAMM HEINZ DIPL CHEM D ,  MUELLER SIEGFRIED ING GRAD ,  KROLL WOLFRAM RAINER DIPL CHEM

IPC: C08K5/05 ,  C08L23/08 ,  C08L95/00