Patent ID: 6774191
Filing Date: 2004-08-10
Classification: C08F,C08L

Abstract:
A branched olefin copolymer having an syndiotactic polypropylene backbone, optionally comprising monomer units from one or more comonomers, and sidechains derived from macromers comprising:(a) vinyl ended copolymer chains having a number average molecular weight (Mn) of about 1500 to 75,000, the number average molecular weight being determined by gel permeation chromatography (GPC) at 145Â° C.; and (b) a ratio of vinyl groups to total olefin groups according to the formula: (vinyl groups/olefin groups)> (comonomer mole percentage+0.1)aÃ—10aÃ—b, wherein a=âˆ’0.24 and b=0.8; or a=âˆ’0.20 and b=0.8; or a=âˆ’0.18 and b=0.83; or a=âˆ’0.15, b=0.83; or a=âˆ’0.10 and b=0.85; wherein:1) the total number of vinyl groups per 1000 carbon atoms of the sidechains is greater than or equal to 8000Ã·Mn(as measured by 1H-NMR at 125Â° C.); 2) the Mw/Mn of the sidechains ranges from 2.083 to 5.666; and 3) the vinyl ended copolymer chains comprise ethylene and at least one comonomer selected from C3 to C12 &agr;-olefins.