Borealis Ag

Borealis Gmbh

Elisabeth Potter

Jingbo Wang

Markus Gahleitner

Luc Monnissen

Meta Cigon

Klaus Bernreitner

Pauli Leskinen

Georg Grestenberger

Jani Aho

Petar Emilov Doshev

Daniela Mileva

Johanna Lilja

Norbert Hafner

Friedrich Berger

Christelle Grein

Cornelia Anita Tranninger

Wilfried Peter Töltsch

Cornelia Kock

Thomas Horill

Juliane Braun

Saeid Kheirandish

Mari Kylmälä

Balakantha Rao Kona

Guenter Gsellmann

Markus Zach

Wilfried Töltsch

Franz Pillinger

Martin Rauch

Arnaud Alabrune

Herbert Klopf

A heterophasic polypropylene composition comprises a matrix based on a propylene-random copolymer and a linear low density polyethylene dispersed in the matrix. The heterophasic polypropylene composition has both improved impact strength and reduced amount of fraction soluble in cold xylene (XCS), while maintaining optical properties. Further, the heterophasic polypropylene composition has an optimised ratio of impact strength to the amount of fraction soluble in cold xylene (XCS).p.

Heterophasic polypropylene composition

A process for producing a cap or closure comprising obtaining a polypropylene composition by sequential polymerization comprising the steps: A) polymerizing in a first reactor, preferably a slurry reactor, in the presence of a Ziegler-Natta catalyst monomers comprising propylene and optionally one or more comonomers selected from ethylene and C4-C10 alpha-olefins, to obtain a first propylene polymer fraction having a comonomer content in the range of 0.0 to 1.8 wt %, and a MFR2 in the range of from 12.0 to 40.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg; B) polymerizing in a second reactor, preferably a first gas-phase reactor, monomers comprising propylene and one or more comonomers selected from ethylene and C4-C10 alpha-olefins, in the presence of the first propylene polymer fraction, to obtain a second propylene polymer fraction, wherein the polypropylene composition comprising said first and second propylene polymer fractions has an MFR2 in the range of from 12.0 to 60.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg, has a comonomer content in the range of from 2.2 to 5.0 wt % and wherein the ratio of the comonomer content of component A) to the comonomer content of the polypropylene composition is 0.35 or less, C) melting, extruding and moulding the polypropylene composition in the presence of at least one nucleating agent to prepare a cap or closure; and D) exposing the cap or closure obtained in step (C) to a cooling rate of 50 K/s or more.

Process for preparing a cap or closure

The invention relates to a process for producing a polypropylene composition by sequential polymerization the polypropylene composition having an improved balanced combination of high flowability, high stiffness and impact, and high level of optical properties.

Process for preparing a polypropylene composition

The invention relates to a process for producing a polypropylene composition having an improved balanced combination of high flowability, high stiffness and impact, and high level of optical properties. Further, the invention relates to the polypropylene composition having the above-mentioned properties, as well as an article comprising the polypropylene composition.

A propylene butylene polymer composition comprising A) a propylene butylene copolymer or a propylene butylene ethylene terpolymer which is&#x2014;free of phthalic acid esters as well as decomposition products thereof; &#x2014;obtained by a Ziegler-Natta catalyst and B) a mixture of at least one particulate and at least one soluble nucleating agent, whereby the propylene butylene polymer composition has&#x2014;a MFR (2.16 kg/210&#xb0; C.) in the range of 12 to 50 g/10 min&#x2014;a tensile modulus (measured on injection moulded test specimens in accordance with ISO 527) of more than 1200 MPa&#x2014;a Tm of more than 150&#xb0; C.&#x2014;an amount of xylene cold soluble (XCS) fraction of less than 7.0 wt.-% and whereby the propylene butylene copolymer includes monomer units derived from a) propylene in an amount of 91-96 wt.-% b) butylene in an amount of 4-9 wt.-% with respect to the total weight of the propylene butylene copolymer. or wherein the propylene butylene ethylene terpolymer includes monomer units derived from a) propylene in an amount of 90-96 wt.-% b) butylene in an amount of 4-9 wt.-% c) ethylene in an amount of not more than 1.0 wt.-% with respect to the total weight of the propylene butylene ethylene terpolymer.

Nucleated C3C4 copolymers and nucleated C3C4C2 terpolymers

The present invention relates to nucleated propylene-ethylene-butylene-terpolymers comprising propylene, butylene, and ethylene, having improved stiffness, better impact behaviour and improved optical properties such as low haze, and low amounts of soluble or extractable fractions.

Nucleated propylene-ethylene-butylene terpolymers and moulded articles made thereof

The present invention relates to nucleated propylene-butylene copolymers comprising propylene and butylene monomer units, wherein the nucleated propylene-butylene copolymer has improved stiffness, better impact behaviour and optical properties such as low haze and improved optomechanical ability.

Propylene-butylene copolymers with improved mechanical and optical properties and better processability as well as articles made therefrom

The present invention is directed to a new heterophasic polypropylene composition showing a good balance between stiffness and impact at low haze, as well as to its use for injection molded articles. The present invention is also directed to provide such heterophasic polypropylene composition in a more simplified mode of production.

High flow heterophasic polypropylene copolymers with improved mechanical and optical properties

Heterophasic propylene copolymer comprising &#x2014;a matrix (M) being a polypropylene, said polypropylene comprises at least three polypropylene fractions, the three polypropylene fractions differ from each other by the melt flow rate MFR(230&#xb0; C.) and at least one of the three polypropylene fractions has a melt flow rate MFR(230&#xb0; C.) in the range of 1.0 to 15.0 g/10 min, and &#x2014;an elastomeric propylene copolymer dispersed in said matrix, wherein &#x2014;the heterophasic propylene copolymer has a melt flow rate MFR(230&#xb0; C.) of equal or more than 20.0 g/10 min, and &#x2014;the amorphous phase of the xylene cold soluble fraction of the heterophasic propylene copolymer has an intrinsic viscosity of equal or higher than 2.0 dl/g.

Heterophasic propylene copolymer with excellent impact/stiffness balance

Process for the production of polypropylene random copolymers containing 2.5 to 5.0 wt % of ethylene as comonomer and having an MFRin accordance with ISO 1 133 (230&#xb0; C., 2.16 kg load) of &#x2267;25 g/10 min to 100 g/10 min and a hexane-solubles content, determined according to FDA CFR 21 &#xa7;177.1520 below 5 wt %, said process comprising the step of polymerizing propylene and ethylene in the presence of a catalyst system comprising (i) a Ziegler-Natta procatalyst which contains a trans-esterification product of a lower alcohol and a phthalic ester as internal donor and (ii) an organometallic cocatalyst and (iii) an external donor represented by formula (I) or (II) Si(OCHCH)(NRR) (I) or Si(OCH)(CH(cyclohexyl) (II) wherein Rand Rcan be the same or different and represent a hydrocarbon group having 1 to 12 carbon atoms, the polypropylene random copolymers with a low level of odor and taste themselves and their use for injection molding applications, preferably for thin-wall packaging for food packaging in non-cooking applications and for medical packaging.

Process for the production of propylene random copolymers for injection moulding applications

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Linz, Austria

Elisabeth Potter