Process for producing propylene/ethylene block copolymer and...

Details Process for producing propylene/ethylene block copolymer and... Process for producing propylene/ethylene block copolymer and...

2007-08-21

2007-08-21

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S118000, C526S126000, C526S127000, C526S129000, C526S130000, C526S160000, C526S170000, C526S943000, C526S941000

Reexamination Certificate

active

10534755

ABSTRACT:
A process for producing a propylene-ethylene block copolymer in a good morphology using a catalyst system comprising a metallocene catalyst (1) preparing high crystalline polypropylene, a metallocene catalyst (2) preparing low crystalline polypropylene, a porous carrier (3), aluminoxane (4) or a compound (4) which can be reacted with the metallocene catalysts described above to form an ionic complex and, if necessary, an organic aluminum compound (5) and a propylene-ethylene block copolymer. The resultant compound has a high transparency and a low elastic modulus.

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