Patent ID: 6680361
Filing Date: 2004-01-20
Classification: C08F,C08L,Y10S

Abstract:
A process for preparing a shear thinning ethylene/&agr;-olefin interpolymer characterized by a Processing Rheology Ratio (PRR) of at least four, the process comprising: contacting ethylene and at least one &agr;-olefin monomer with a catalyst and an activating cocatalyst under conditions sufficient to attain an ethylene conversion of at least 80 weight percent, the conditions including a temperature of at least 80Â° C. and, optionally, in the presence of an effective amount of hydrogen, the amount being sufficient to maintain an interpolymer PRR of at least 4, the catalyst being a constrained geometry metal complex, where PRR=(interpolymer Viscosity measured at 190Â° C. with a shear rate of 0.1 rad/sec)/(interpolymer Viscosity measured at 190Â° C. with a shear rate of 100 rad/sec)+[3.82âˆ’interpolymer Mooney Viscosity (ML1+4 @ 125Â° C.)]Ã—0.3.