Patent ID: 6660809
Filing Date: 2003-12-09
Classification: C08F,C08L

Abstract:
A branched olefin polymer having an isotactic polypropylene backbone, optionally comprising monomer units from one or more comonomers, and sidechains derived from macromers comprising:(a) vinyl ended ethylene homopolymer or ethylene coplymer chains having a number average molecular weight (Mn) of about 1500 to 25,154, the number average molecular weight being determined by gel permeation chromatography (GPC) at 145Â° C.; (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—bzwherein 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 determined by 1H-NMR at 125Â° C.); 2) the Mw/Mn of the side chains ranges from 2.083 to 5.666; 3) the total comonomer content of the branched olefin copolymer is from 0 to 20 mole percent; and 4) the mass ratio of the isotactic polypropylene to the sidechains ranges from 99.9:0.1 to 50:50.