Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
2002-06-26
2008-12-30
Rábago, Roberto (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
C525S053000, C525S240000, C526S064000, C526S159000, C526S348000, C526S073000
Reexamination Certificate
active
07470756
ABSTRACT:
The present invention relates to a process for preparing a propylene random copolymer comprising polymerisation of propylene with a comonomer, said comonomer being ethylene or an α-olefin comprising at least four carbon atoms, in the presence of a catalyst in a muiltistage process comprising polymerisation of propylene with a comonomer in a first reaction zone including at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone including at least one gas phase reactor and polymerisations of propylene with a comonomer in said gas phase reactor in the presence of said first polymerisation product, wherein the temperature in the gas phase reactor is at least 10° C. higher than in the slurry reactor and to a polymer obtainable by this process. Furthermore, the invention relates to a propylene random copolymer prepared by copolymerisation of propylene with a comonomer wherein the distribution of the comonomer determined according to the TREF method is multimodal, preferably bimodal, a peopylene radom copolymer prepared by copolymerisation of propylene with a comonomer wherein the copolymer is having an elution interval determined according to the TREF method of 50° C. or more, a propylene random copolymer prepared by copolymerisation of propylene with a comonomer, wherein the random copolymer is a unimodal polymer and the elution interval determined by the TREF method is given by the equation Y≦4.5.m+16 wherein Y is the elution interval in ° C. and m is the percentage of ethylene in the copolymer in wt. %, and to the use of such a copolymers for the production of a film, of an article by blow moulding or injection moulding, of a fibre or of a pipe.
REFERENCES:
patent: 791 609 (1997-08-01), None
patent: 887 380 (1998-12-01), None
patent: WO-98/59002 (1998-12-01), None
International Search Report corresponding to PCT/EP02/07081, Dec. 23, 2003.
Gahleitner Markus
Hafner Norbert
Jääskeläinen Pirjo
Pitkänen Päivi
Töltsch Wilfried
Borealis Technology Oy
Fay Sharpe LLP
Rábago Roberto
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