Propylene polymer resin with improved properties

Details Propylene polymer resin with improved properties Propylene polymer resin with improved properties

2007-05-22

2007-05-22

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S065000, C525S053000, C525S240000, C428S364000

Reexamination Certificate

active

11191192

ABSTRACT:
The present invention relates to a process for the production of a propylene polymer in a multistage polymerisation process comprising the polymerisation of propylene in the presence of a catalyst in a first reaction zone comprising at least one slurry reactor to give a first polymerisation product, transferring said first product to a second reaction zone comprising at least one gas phase reactor and continuing polymerisation of propylene in the gas phase in the presence of said first polymerisation product which is characterised in that the temperature in both the slurry and the gas phase reactor is at least 75° C. and the product of at least one reactor is having an ethylene content in the range of 0.05 to 0.5 wt. %. Furthermore, the invention relates to a propylene polymer obtainable by the inventive process, to a propylene polymer which is characterised in that it comprises ethylene comonomer in an amount of 0.05 to 0.5 wt. %, is having a xylene solubles contents of 3.0 wt. % or less and is having a maximum in its temperature rising elution fractionation (TREF)-function at 120° C. or less, and to articles such as fibres, non-wovens, films and sheets comprising the inventive polymer.

REFERENCES:
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patent: WO 01/04166 (2001-01-01), None
European Search Report correspondence to International Application No. PCT/EP02/07083.
Bond, Eric B., et al., Article titledThe Effects of Atacticity, Comonomer Content, and Configurational Defects on the Equilibrium Melting Temperature of Monoclinic Isotactic Polypropylene, Journal of Applied Polymer Science, vol. 81, 229-236 (2001).

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