EP 0902809 A1 19990324 - ETHYLENE POLYMER PRODUCT HAVING A BROAD MOLECULAR WEIGHT DISTRIBUTION, ITS PREPARATION AND USE
Title (en)
ETHYLENE POLYMER PRODUCT HAVING A BROAD MOLECULAR WEIGHT DISTRIBUTION, ITS PREPARATION AND USE
Title (de)
ETHYLEN POLYMER MIT BREITER MOLEKULARGEWICHTSVERTEILUNG, SEINE HERSTELLUNG UND VERWENDUNG
Title (fr)
PRODUIT A BASE DE POLYMERE D'ETHYLENE POSSEDANT UNE REPARTITION DE POIDS MOLECULAIRE ETENDUE, ET PREPARATION ET UTILISATION DE CE PRODUIT
Publication
Application
Priority
- FI 9700353 W 19970606
- FI 962366 A 19960607
Abstract (en)
[origin: WO9747682A1] Although ethylene polymer products having a bimodal or multimodal molecular weight distribution have good processability and mechanical properties, these properties are not entirely satisfactory. Such bimodal or multimodal ethylene polymer products are now being improved by (a) forming a blend of a first ethylene polymer having a first average molecular weight and a first molecular weight distribution and at least a second ethylene polymer having a second average molecular weight which is higher than said first average molecular weight and a second molecular weight distribution giving the blend a third average molecular weight and a third molecular weight distribution which is at least bimodal, (b) heating and melt processing the blend of step (a) into a molten ethylene polymer having a fourth average molecular weight and a fourth molecular weight distribution, and (c) cooling and solidifying the molten ethylene polymer into said ethylene polymer product, whereby in step (b), the blend of step (a) is subjected to controlled free radical reactions in such a way that the fourth average molecular weight is higher than, or approximately equal to, the third average molecular weight, and the fourth molecular weight distribution is broader than the third at least bimodal molecular weight distribution.
IPC 1-7
IPC 8 full level
C09D 123/06 (2006.01); C08F 210/16 (2006.01); C08L 23/08 (2006.01)
CPC (source: EP)
C08F 210/16 (2013.01); C08L 23/0815 (2013.01); C08L 2205/02 (2013.01); C08L 2310/00 (2013.01); C08L 2314/02 (2013.01)
Citation (search report)
See references of WO 9747682A1
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
WO 9747682 A1 19971218; EP 0902809 A1 19990324; FI 108452 B 20020131; FI 962366 A0 19960607; FI 962366 A 19971208; RU 2167900 C2 20010527
DOCDB simple family (application)
FI 9700353 W 19970606; EP 97925086 A 19970606; FI 962366 A 19960607; RU 98102364 A 19960710