Borealis Technology Oy

Mika Meller

Kauno Alastalo

Bo Malm

Nina Ackermans

P&auml;ivi Pitk&auml;nen

Kshama Motha

Anne Britt Bj&aring;land

A process for producing terpolymers of propylene, comprising a) feeding into a slurry reactor a reaction mixture containing 50-85 w-% of propylene, 1-10 w-% of ethylene, 15-40 w-% of another C -C alpha-olefin, a catalyst system maintaining olefin polymerization at said temperature conditions, and optionally hydrogen, b) polymerizing said reaction mixture at a temperature of lower than 70&deg; C. a sufficient time to obtain a propylene terpolymer amounting to 50-99 w-% of the end product, c) transferring said reaction mixture into a gas phase reactor operating at a pressure of higher than 5 bars, preferably higher than 10 bars, optionally adding 0-30 w-% of ethylene, 0-10 w-% of another C -C alpha-olefin, 0-40 w-% of propylene and optionally hydrogen, and d) continuing polymerization in said gas phase reactor for obtaining a propylene terpolymer amounting to 1-50 wt-% of the end product. The terpolymer has a melting temperature a less than 135&deg; C., preferably less than 132&deg; C., and it can be used for manufacturing films having good sealing properties.

Propylene terpolymers

Process for the production of propylene terpolymers

Growing community of inventors

Oron la Ville, Switzerland

Mika Meller