Long Chain Branched Polypropylene

Abstract

A process for preparing a long chain branched polypropylene in presence of two metallocene-based active catalyst systems is provided. The polypropylene obtained therefrom has new molecular architecture and improved elasticity properties. The polypropylene is further characterized by new signals in its 13 C NMR spectrum.

1 .- 10 . (canceled) 
     
     
         11 . A long chain branched polypropylene having  13 C NMR signals at δ 44.88, 44.74, 44.08 and 31.74 ppm characterized in that the long chain branched polypropylene further has one or more of the following  13 C NMR signals at δ 51.1, 49.0, 38.9, 27.1, 26.6, 24.0, 23.3, 23.0, 22.9 or 19.8 ppm. 
     
     
         12 . The long chain branched polypropylene according to  claim 11 , characterized in that the long chain branched polypropylene has a molecular weight M n  of at least 20,000 g·mol −1 . 
     
     
         13 . The long chain branched polypropylene according to  claim 11 , having total long chain branching content higher than 3 per 10,000 C. 
     
     
         14 . The long chain branched polypropylene according to  claim 11 , wherein the loss angle, δ, evolution as a function of complex modulus G* comprises a portion increasing with the complex modulus in the range of G* greater than 1,000 Pa. 
     
     
         15 . The long chain branched polypropylene according to  claim 11 , wherein said long chain branched polypropylene has a melting temperature greater than 135° C. 
     
     
         16 . The long chain branched polypropylene according to  claim 11 , wherein the long chain branching has at least 420 carbon atoms. 
     
     
         17 . An article comprising the long chain branched polypropylene according to  claim 11 .