公开(公告)号：DE1806288A1

公开(公告)日：1970-05-06

申请号：DE1806288

申请日：1968-10-31

Applicant: BASF AG

Inventor： RETTIG AUGUST ,  HELMUT PFANNMUELLER DR ,  FRIEDRICH URBAN DR

IPC: B29B9/16 ,  B29B13/04 ,  B29C35/16 ,  B29C47/88 ,  B29C71/00 ,  B29D7/00

Abstract: Cooling of softened thermoplastic material in the manufacture of granules, sheet, mouldings or semi-finished products, is achieved by contact with a mixture of water and hydrophobic silica particles. Water droplets are not left on the plastic as occurs with water cooling and the cooled articles do not stick together. Shorter cooling times are required than for air cooling and it is easier to maintain dimensional tolerances. The transparency is also improved since the fast cooling allows higher amorphous contents to be obtained. Specifically the coolant contains 80-95% water and 20-5% SiO2, and especially 90% water + 10% SiO2. A layer less than 1u thick is retained by the plastic and this permits printing to be done without previous oxidation of the surface. Optionally a dyestuff may be included in the coolant.

公开(公告)号：DE1934541A1

公开(公告)日：1971-01-14

申请号：DE1934541

申请日：1969-07-08

Applicant: BASF AG

Inventor： HEINZ GEHRIG DR DIPL-ING ,  RICHARD SINN PROF DR ,  DIETER STOCKBURGER DR DIPL-ING ,  JOHANN ZIZLSPERGER DR ,  HELMUT PFANNMUELLER DR ,  FRIEDRICH URBAN DR

IPC: D01D5/26 ,  D01D5/42 ,  D01D5/00

公开(公告)号：DE1927527A1

公开(公告)日：1970-12-03

申请号：DE1927527

申请日：1969-05-30

Applicant: BASF AG

Inventor： HELMUT PFANNMUELLER DR ,  FRIEDRICH URBAN DR ,  WALTER HENSEL DR ,  OSKA BUECHNER DR

IPC: C08F10/00 ,  C08F

Abstract: Polyethylenes are produced continuously from a mixture of 100 wt. parts ethylene, 0.5-1.5 ppm (based on ethylene) of a radical polymersn initiator, and 0.05-5 wt. parts of a polymerisn. regulator, at increased temp. and press of 1000-3000 atm., in a tubular reactor having length, diameter ratio of 5000:1-30000:1. The polymerisn, mixture in introduced at 70-120 degrees C and the temp. increases to 230-280 degrees C in the first 5/15 of the tube, is maintained within 5 degrees C of this temp. in the next 9/15 of the tube, and is cooled in the last 1/15 to 30-60 degrees C. The mixture is passed through at 3-30 m/sec. Polymer produced has narrow softening range and also shows good mechanical properties outside this range.

公开(公告)号：DE1454760A1

公开(公告)日：1969-05-08

申请号：DE1454760

申请日：1964-08-14

Applicant: BASF AG

Inventor： HOTZ JOHANN ,  WOLFGANG IMMEL DR ,  KLAUS KOCH DIPL-ING ,  KARL MAHLER DR ,  HANS-JUERGEN MUELLER DIPL-ING ,  LUDWIG RAICHLE DIPL-ING ,  FRIEDRICH URBAN DR

IPC: B29B9/00 ,  B29B9/06 ,  C08J

公开(公告)号：DE1445229A1

公开(公告)日：1968-12-12

申请号：DE1445229

申请日：1960-12-06

Applicant: BASF AG

Inventor： HANS EILBRACHT DR ,  HELMUT PFANNMUELLER DR ,  RUDI-HEINZ ROTZOLL DR ,  FRIEDRICH URBAN DR ,  WIELAND ZACHER DR

IPC: C08F10/00

Abstract: A process for removing solvent from polyethylene produced in a high pressure continuous process and from the low-pressure recycle gas comprises the steps of separating the polyethylene from the reaction mixture in a high pressure separator 10 at a pressure of more than 150 atmospheres and while maintaining a definite level of liquid therein is decompressed into a low-pressure separator 13 from which the entrained residual ethylene and solvent are led through a gas cooler 23 into a third separator 24 where the ethylene is substantially freed from solvent and led at atmospheric pressure with the remaining solvent to a countercurrent heat-exchanger 26. The ethylene separated in the high-pressure separator with the bulk of the solvent is cooled in a precooler 16, part of this is expanded and separated from the solvent in a low-temperature separator 19 and returned through said heat-exchanger 26 and a second heat-exchanger 28 to the precompressor 3 where it is mixed with fresh ethylene 1. The remainder of the ethylene from the precooler 16 is further cooled in an after-cooler 21 and supplied to the after-compressor 5 before passing to the reaction vessel 7. Solvent is removed from the system by valves 20 and 25 and enters the system by valve 31. Polyethylene is removed through valve 14.

公开(公告)号：DE1920777A1

公开(公告)日：1970-11-12

申请号：DE1920777

申请日：1969-04-24

Applicant: BASF AG

Inventor： HEINZ GEHRIG DIPL-ING DR ,  DIETER STOCKBURGER DIPL-ING DR ,  RICHARD SINN DR PROF ,  KLAUS STEIGERWALD DR ,  FAUTH KARL-HEINZ ,  FRIEDRICH URBAN DR

IPC: C08J3/12 ,  B01J2/02 ,  B05B7/14 ,  B22F9/08 ,  B29B9/06

公开(公告)号：DE1812094A1

公开(公告)日：1970-06-18

申请号：DE1812094

申请日：1968-12-02

Applicant: BASF AG

Inventor： HELMUT PFANNMUELLER DR ,  FRIEDRICH URBAN DR ,  OSKAR BUECHNER DR ,  KLAUS STEIGERWALD DR

IPC: C08F10/00

公开(公告)号：DE1495107A1

公开(公告)日：1969-03-27

申请号：DE1495107

申请日：1962-08-29

Applicant: BASF AG

Inventor： KLAUS KINKEL DR ,  HELMUT PFANNMUELLER DR ,  PETER RODER DR ,  RUDI-HEINZ ROTZOLL DR ,  MANFRED TITTEL DR ,  FRIEDRICH URBAN DR ,  WIELAND ZACHER DR

IPC: C08F10/00 ,  C08F110/02 ,  C08F3/04

Abstract: Polyethylene of density 0.91 to 0.94 is produced by polymerization of ethylene at 150 DEG to 300 DEG C. and 1500 to 3000 atmospheres in a tubular reactor with oxygen as catalyst and in the presence of a chain transfer agent, wherein the reaction mixture is heated to 168 DEG to 174 DEG C. in the reactor and then heat is immediately extracted externally through the reactor wall by means of a coolant whose temperature does not exceed 170 DEG C., the temperature of the reaction mixture not falling below 168 DEG C. In examples, the cooling medium used is water under pressure and at 160-170 DEG C. The transfer agent may be hydrogen, a hydrocarbon, an alcohol, an ester, an acid anhydride, an aldehyde or a ketone. Sheet of good transparency may be obtained.