Polypropylene ethylene-propylene copolymer blends and in-line process to produce them

A blend of isotactic polypropylene and ethylene-propylene copolymer comprising:

• between 1 and 50 wt % of isotactic polypropylene with more than 15 and less than 100 regio defects (sum of 2,1-erythro, 2,1-threo insertions, and 3,1-isomerizations) per 10,000 propylene units in the polymer chain, an mmmm pentad fraction of 0.85 or more, a weight average molecular weight (Mw) of at least 35 kg/mol, a melting peak temperature of 149° C. or higher, a heat of fusion (ΔHf) of at least 80 J/g, and wherein the difference between the DSC peak melting and the peak crystallization temperatures (Tmp−Tcp) is less than or equal to 0.907 times the melting peak temperature minus 99.64 (Tmp−Tcp≦0.907 Tmp−99.64)° C., and
• between 50 and 99 wt % of ethylene-propylene copolymer including between 10 wt % and 20 wt % randomly distributed ethylene with a melt flow rate (as measured by ASTM D-1238, Condition L, 2.16 kg and 230° C.) of between 0.5 and 20,000 g/10 min.

A blend of polypropylene and ethylene-propylene copolymer comprising:

• between 1 and 50 wt % of isotactic polypropylene with more than 15 and less than 100 regio defects (sum of 2,1-erythro, 2,1-threo insertions, and 3,1-isomerizations) per 10,000 propylene units in the polymer chain, an mmmm pentad fraction of 0.85 or more, a weight average molecular weight (Mw) of at least 35 kg/mol, a melting peak temperature of 149° C. or higher, a heat of fusion (ΔHf) of at least 80 J/g, and wherein the difference between the DSC peak melting and the peak crystallization temperatures (Tmp−Tcp) is less than or equal to 0.907 times the melting peak temperature minus 99.64 (Tmp−Tcp≦0.907 Tmp−99.64)° C., and
• between 50 and 99 wt % of ethylene-propylene copolymer including between 10 wt % and 20 wt % randomly distributed ethylene with a melt flow rate (as measured by ASTM D-1238, Condition L, 2.16 kg and 230° C.)of between 0.5 and 20,000 g/10 min, wherein the copolymer is polymerized by a bulk homogeneous polymerization process, and wherein the total regio defects in the continuous propylene segments of the copolymer is between 40 and 150% greater than a copolymer of equivalent melt flow rate and wt% ethylene polymerized by a solution polymerization process.