Borealis Ag

Tua Sundholm

Klaus Bernreitner

Katja Ellen Klimke

Martina Sandholzer

Jouni Purmonen

Noureddine Ajellal

Floran Prades

Andreas Albrecht

Angelica Maëlle Delphine Legras

Bo Malm

Ravindra Tupe

Auli Nummila-Pakarinen

John Jamieson

Jari-Jussi Ruskeeniemi

Leif Leiden

Franz Ruemer

Thomas Horill

Minna Aarnio-Winterhof

Herbert Gabriel

Norbert Jansen

Angelica Legras

Valeria Poliakova

Liubov Havula

Juha Kuosa

Andreas Wolf

Juha Hartikainen

Hannu Kalervo Tahvanainen

Mario Wonka

Liubov Nikiforova

The present invention relates to an adhesive polyethylene composition comprising (A) from 60 to 90 wt % of a non-elastomeric polyethylene; (B) from 9.0 to 38 wt % of an ethylene based elastomer being a copolymer of ethylene and alpha-olefin comonomer units having from 4 to 12 carbon atoms; wherein onto component (A) or components (A) and (B) an acid grafting agent (C) has been grafted in an amount of from 0.01 to 3.0 wt %, all based on the total weight of the adhesive polyethylene composition, a multi-layer structure comprising said adhesive polyethylene composition and the use of said adhesive polyethylene composition for the production of a multi-layer structure.

Adhesive polyethylene composition

Process for producing a polymer composition, a polymer composition obtainable by said process and the use of said polymer composition as adhesive polymer composition and for the production of a multilayer structure, such as a three-layer metal pipe coating, with improved peel strength.

Process for producing a polymer composition

The present invention relates to a polymer composition comprising (A) from 60 to 90 wt % of a non-elastomeric polyethylene; (B) from 9.0 to 38 wt % of an elastomer; wherein onto component (A) or components (A) and (B) an acid grafting agent (C) has been grafted in an amount of from 0.01 to 3.0 wt %, all based on the total weight of the polymer composition, and wherein the polymer composition has two distinct peaks and a valley between said peaks in the GPC curve and a Z value, determined from the areas below the two peaks of the GPC curve, of at least −0.3, wherein the Z-value is determined according to formula (I) Z=s/Abs(B−A) (I) wherein Abs(B−A) is the absolute value of (B−A); A=the area, between the tangent parallel to the MW axis going through log M (Min) and the LS15 signal, from log M of 5.1 to log M value where the LS signal is minimum log M (Min), in the log M range between 5.1 and 6; B=the area, between the tangent parallel to the MW axis going through log M (Min) and the LS 15 signal, from log M(Min) to the point where the LS signal is crossed again; and s is the slope between the two peaks of the GPC curve, defined at log M of 5.1 and 6, wherein the GPC curve is defined as the concentration normalized LS 15 signal along the molecular weight of conventional GPC, obtained from the GPC-VISC-LS analysis, a multi-layer structure such as a coated metal pipe, comprising one layer comprising said polymer composition and the use of said polymer composition as adhesive polymer composition and for the production of a multi-layer structure.

Polymer composition

An adhesive polymer composition comprising a non-elastomeric copolymer of ethylene and one or more comonomers having 3 to 10 carbon atoms, and an elastomer is disclosed herein. The non-elastomeric copolymer is present in an amount of 60 to 95% by weight, based on the adhesive polymer composition, has a weight average molecular weight Mw of from 50 000 to 80 000 g/mol, molecular weight distribution Mw/Mn of 2.0 to 5.5, density of from 0.925 to 0.945 g/cm, and at most 0.1 vinyl groups/1000 carbon atoms. The non-elastomeric copolymer or the non-elastomeric copolymer and the elastomer have been grafted with an acid grafting agent.

Adhesive polymer composition

Heterophasic polypropylene composition having an MFR(2.16 kg, 230&#xb0; C.) of 3.0 to 7.0 g/10 min, determined according to ISO 1 133, and a Vicat A50 softening temperature of more than 110&#xb0; C. measured according to DIN EN ISO 306 at 10 N on an injection molded test specimen with the dimensions of 80&#xd7;10&#xd7;4 mmand a heat rate of 50&#xb0; C./h including a propylene random copolymer matrix phase (A), and an ethylene-propylene copolymer rubber phase (B) dispersed within the matrix phase, wherein the heterophasic polypropylene composition has a fraction soluble in p-xylene at 23&#xb0; C. (XCS fraction), and a fraction insoluble in p-xylene at 23&#xb0; C. (XCU fraction), said heterophasic polypropylene composition having a tensile modulus of 450 to 850 MPa when measured according to ISO 527-2 at 23&#xb0; C. temperature with an elongation rate of 1 mm/min on injection molded test specimens type 1A prepared according to ISO 1873-2; and a normalized maleic anhydride index IMA equal to or less than 0.036 &#x3bc;m.

Soft heterophasic polyolefin composition

The present invention relates to a heterophasic polymer composition which comprises (i) a matrix comprising a propylene homopolymer and/or a propylene copolymer having an amount of comonomer units of less than 1.0 wt %, and (ii) an elastomeric polypropylene which is dispersed within the matrix and comprises comonomer units derived from ethylene and/or a C4 to C12 alpha-olefin; and wherein the heterophasic polymer composition has an amorphous fraction AM in an amount of 2.0 to 7.5 wt %, and the amorphous fraction AM has an amount of ethylene- and/or C4 to C12 alpha-olefin-derived comonomer units of 20 to 45 wt %.

Heterophasic polymer composition of high stiffness

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Porvoo, Finland

Tua Sundholm