Title:
【発明の名称】ポリエチレンならびにエチレン主要含有量からの共重合体の製造方法
Document Type and Number:
Japanese Patent JP3103576
Kind Code:
B2
Abstract:
Polyethylene and copolymers comprising predominantly ethylene with minor amounts of ethylene-polymerisable comonomers are obtainable by free-radical polymerisation of the monomers at pressures of from 1,500 to 5,000 bar and at temperatures of from 40 to 250 DEG C by means of an initiator, with virtual exclusion of oxygen, in at least n = 3 polymerisation steps, where, in the first step, all or the majority of the monomers are subjected to polymerisation by means of some of the initiator required until the polymerisation virtually stops, a further portion of the initiator and, if appropriate, the monomers are then added to the mixture cooled by from 20 to 60 DEG C, and this procedure is repeated in the subsequent steps as far as the nth step, with the proviso that the initiators used in the (n-1)th step have a half value temperature of from 80 to 160 DEG C.
Inventors:
Norbert, Hasenbine
Wolfgang, Bal
Jurgen, Schmidt-Tumes
Gernot, Koehler
Wolfgang, Bal
Jurgen, Schmidt-Tumes
Gernot, Koehler
Application Number:
JP10329290A
Publication Date:
October 30, 2000
Filing Date:
April 20, 1990
Export Citation:
Assignee:
BASF Akchen Gezel Shaft
International Classes:
C08F2/00; C08F2/34; C08F4/32; C08F10/00; C08F10/02; C08F210/00; C08F210/02; E21F1/04; F16L11/02; (IPC1-7): C08F10/02; C08F2/00; C08F210/02
Domestic Patent References:
| JP62263208A | ||||
| JP62199603A | ||||
| JP5322582A |
Attorney, Agent or Firm:
Joji Tashiro
Previous Patent: 半導体記憶装置
Next Patent: STORE TABLE, STAND, INFORMATION DESK AND/OR TRADE FAIR STAND STRUCTURE
Next Patent: STORE TABLE, STAND, INFORMATION DESK AND/OR TRADE FAIR STAND STRUCTURE