Reliance Industries Limited

Harshad Ramdas Patil

Virendrakumar Gupta

Virendra Kumar Gupta

Dhananjay Ghelabhai Naik

Priyanshu Bharatkumar Vyas

Gurmeet Singh

Sukhdeep Kaur

The invention relates to a catalyst system for polymerization of propylene, the catalyst system comprising a Ziegler Natta procatalyst, an organoaluminium cocatalyst, a monoester of an aromatic carboxylic acid as the internal donor and ethyl-4-isopropoxy benzoate as the selectivity control agent. The invention also relates to a process for polymerization using the catalyst system as well as to polymers prepared by the process.

Propylene polymerization catalyst system

The present invention discloses new class of nitrogen containing external donor systems. These donor systems are used in titanium supported on magnesium dichloride pro-catalyst system for polymerization of propylene. The external donor systems of the present invention in combination with silane show the kinetics control for diester catalyst polymerization process along with stereo regularity control of product. The polypropylene produced using nitrogen containing external donor systems of the present invention have broad molecular weight distribution.

Nitrogen containing external donor system for propylene polymerization

The invention relates to a process for the synthesis of a Ziegler Natta procatalyst, the process comprising first treating magnesium alkoxide with a twice used mixed solvent of TiCland chlorobenzene to form a first stage product, then treating the first stage product with a once used mixed solvent of TiCland chlorobenzene to form a second stage product and finally treating the second stage product with mixed solvent recovered by treatment of effluent from the first treatment with benzoyl chloride so as to convert contaminant of formula TiClOR in the effluent to an addition complex which is precipitated, filtered off and hydrolyzed to recover ethyl benzoate and to form Ti(OH)as a side product, the product after final treatment being subjected to a plurality of successive washing steps with used as well as recovered hexane.

Process for the synthesis of alpha-olefin polymerization procatalysts

The invention relates to a catalyst system for polymerization of olefins, the catalyst system comprising a titanium-containing procatalyst carrying internal electron donor(s), an organoaluminium cocatalyst and a mixture of external electron donors, the mixture comprising a carboxylic acid ester or derivatives thereof, an alkoxy silane and a nitrogen based compound. The invention also relates to a process for polymerization of olefin(s) and to the polyolefin synthesized by the process.

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Mumbai, India

Harshad Ramdas Patil