Process for producing propylene block copolymer

Details Process for producing propylene block copolymer Process for producing propylene block copolymer

2009-06-29

2011-10-18

Cheung, William (Department: 1762)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C526S348000, C526S351000, C526S090000

Reexamination Certificate

active

08039552

ABSTRACT:
A production process of a propylene block copolymer, comprising the step (I) of polymerizing propylene alone or a combination of propylene with an olefin other than propylene, in the presence of a defined polymerization catalyst, to form a polymer component (1), and the step (II) of copolymerizing propylene with an olefin other than propylene in the presence of the polymer component (1), to form a polymer component (2), wherein a combination of a transition metal compound such as Zr(OR1)4and Hf(OR1)4(R1being a hydrocarbon group) with an ether group-containing linear hydrocarbon compound and/or a Lewis base compound is added to the above polymerization system between the ending point of the step (I) and the starting point of the step (II), or during the step (II).

REFERENCES:
patent: 5134209 (1992-07-01), Job et al.
patent: 5449738 (1995-09-01), Koura et al.
patent: 5473021 (1995-12-01), Koura et al.
patent: 4634092 (1971-10-01), None
patent: 4741676 (1972-10-01), None
patent: 5236786 (1977-09-01), None
patent: 5239431 (1977-10-01), None
patent: 54148093 (1979-11-01), None
patent: 5552309 (1980-04-01), None
patent: 5523561 (1980-06-01), None
patent: 5724361 (1982-05-01), None
patent: 61181807 (1986-08-01), None
patent: 63142008 (1988-06-01), None
patent: 64006006 (1989-01-01), None
patent: 128049 (1989-05-01), None
patent: 343283 (1991-07-01), None
patent: 4227604 (1992-08-01), None
patent: 480044 (1992-12-01), None
patent: 58021405 (1993-02-01), None
patent: 5339319 (1993-12-01), None
patent: 6179720 (1994-06-01), None
patent: 7116252 (1995-12-01), None
patent: 8134124 (1996-05-01), None
patent: 9031119 (1997-02-01), None
patent: 11080234 (1999-03-01), None
patent: 11228628 (1999-08-01), None
patent: 11322833 (1999-11-01), None
patent: 3129458 (2001-01-01), None
patent: 3325419 (2002-09-01), None
patent: 2004182981 (2004-07-01), None

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