EP 1047718 A1 20001102 - MEDIUM DENSITY ETHYLENE POLYMERS, A PROCESS TO PREPARE THESE POLYMERS AND USE OF CARBONYL GROUP CONTAINING CHAIN TRANSFER AGENTS IN THIS PROCESS

Title (en)

MEDIUM DENSITY ETHYLENE POLYMERS, A PROCESS TO PREPARE THESE POLYMERS AND USE OF CARBONYL GROUP CONTAINING CHAIN TRANSFER AGENTS IN THIS PROCESS

Title (de)

ÄTHYLENPOLYMERE MITTLERER DICHTE, VERFAHREN ZUR HERSTELLUNG DIESER POLYMERE UND VERWENDUNG VON CARBONYL-HALTIGEN KETTENÜBERTRAGUNGSMITTELN IN DIESEM VERFAHREN

Title (fr)

POLYMERES D'ETHYLENE A DENSITE MOYENNE, LEUR PROCEDE DE PREPARATION ET AGENTS DE MIGRATION DE CHAINE CONTENANT DES GROUPES CARBONYLE MIS EN OEUVRE DANS CE PROCEDE

Publication

EP 1047718 A1 20001102 (EN)

Application

EP 99903039 A 19990111

Priority

EP 98200054 A 19980112
US 9900576 W 19990111

Abstract (en)

[origin: EP0928797A1] The present invention relates to an ethylene homo or copolymer having a density of between 0.923 and 0.935 g/cm<3>, having a molecular weight distribution Mw/Mn of between 3 and 10, and comprising from 0.10 to 0.50 wt.% of units derived from a carbonyl group containing compound, based on the total weight of the homo or copolymer. In addition, the invention relates to a free radical initiation polymerization process for the preparation of medium density ethylene polymers or copolymers, comprising reacting ethylene and optionally one or more comonomers at a high pressure, conveniently between 1600 and 4000 kg/cm<2>, and at temperatures of about 150-330 DEG C in a reactor system consisting of at least one autoclave reactor or of a combination of autoclave and tubular reactors, in the presence of free radical initiators and a carbonyl group containing compound, characterized in that such amounts of the carbonyl group containing compound are used so as to provide an ethylene polymer or copolymer comprising 0.15-0.50 wt.% of carbonyl group containing compound derived units based on the weight of the total polymer and having a density of between 0.923 and 0.935 g/cm<3>. Finally, the invention relates to carbonyl group containing chain tranfer agents to obtain improved polymer processing and performance properties in flat die extrusion processes and applications.

IPC 1-7

C08F 10/02; C08F 4/32

IPC 8 full level

C08F 4/32 (2006.01); C08F 4/34 (2006.01); C08F 2/34 (2006.01); C08F 10/02 (2006.01); C08F 110/02 (2006.01)

CPC (source: EP)

C08F 10/02 (2013.01); C08F 110/02 (2013.01)

C-Set (source: EP)

C08F 10/02 + C08F 2/00
C08F 10/02 + C08F 4/32
C08F 10/02 + C08F 2/38
C08F 110/02 + C08F 2500/08 + C08F 2500/12 + C08F 2500/26

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

DOCDB simple family (publication)

EP 0928797 A1 19990714; EP 0928797 B1 20040908; EP 0928797 B3 20120111; AR 014294 A1 20010207; AT E275590 T1 20040915; AU 2315599 A 19990726; BR 9907206 A 20010130; BR 9907206 B1 20081118; CA 2316880 A1 19990715; CA 2316880 C 20081118; CN 1136240 C 20040128; CN 1288474 A 20010321; DE 69826103 D1 20041014; DE 69826103 T2 20050120; DE 69826103 T3 20120712; EP 1047718 A1 20001102; HU 223101 B1 20040329; HU P0101073 A2 20010730; HU P0101073 A3 20020628; JP 2002500250 A 20020108; NO 20003560 D0 20000711; NO 20003560 L 20000905; PL 199967 B1 20081128; PL 341706 A1 20010423; WO 9935175 A1 19990715

DOCDB simple family (application)

EP 98200054 A 19980112; AR P990100098 A 19990112; AT 98200054 T 19980112; AU 2315599 A 19990111; BR 9907206 A 19990111; CA 2316880 A 19990111; CN 99802125 A 19990111; DE 69826103 T 19980112; EP 99903039 A 19990111; HU P0101073 A 19990111; JP 2000527570 A 19990111; NO 20003560 A 20000711; PL 34170699 A 19990111; US 9900576 W 19990111