US 2019/0292283 A1 · POLYMER COMPOSITION AND A PROCESS FOR PRODUCTION OF THE POLYMER COMPOSITION

Abstract

A polyethylene composition comprising a base resin is disclosed herein. The base resin includes an ethylene homo- or copolymer fraction (A1), and an ethylene homo- or copolymer fraction (A2). Fraction (A1) has a lower weight average molecular weight than fraction (A2). The base resin has a melt flow rate MFR21 of equal to or less than 8.0 g/10 min and a density of 930 to 950 kg/m3. The polyethylene composition has a melt flow rate MFR5 of 0.01 to 0.3 g/10 min, a flow rate ratio FRR21/5 of equal to or more than 20 and a ratio of the weight average molecular weight and the number average molecular weight (Mw/Mn) of equal to or less than 30. Also the polyethylene composition has a tensile modulus of less than 1000 MPa. Also a process for the production of a polyethylene composition comprising polyethylene base resin is disclosed herein.

Claims16

Dependent claims

A polyethylene composition comprising a base resin which comprises

(a) an ethylene homo- or copolymer fraction (A1);
and
(b) an ethylene homo- or copolymer fraction (A2),
wherein
(I) fraction (A1) has a lower weight average molecular weight than fraction (A2);
(II) the base resin has a density of 930 to 950 kg/m3;
(III) the base resin has a melt flow rate MFR21 of equal to or less than 8.0 g/10 min;
(IV) the polyethylene composition has a melt flow rate MFR5 of 0.01 to 0.3 g/10 min;
(V) the polyethylene composition has a flow rate ratio FRR21/5 of equal to or more than 20;
(VI) the ratio of the weight average molecular weight and the number average molecular weight (Mw/Mn) of the polyethylene composition is equal to or less than 30;
and
(VII) the polyethylene composition has a tensile modulus of less than 1000 MPa.

9 more elements

A process for the production of a polyethylene composition comprising a polyethylene base resin, which comprises steps of

(a) polymerising ethylene and optionally at least one comonomer in the presence of a polymerisation catalyst to form an ethylene homo- or copolymer fraction (A1);
and
(b) polymerising ethylene and optionally at least one comonomer in the presence of same or different polymerisation catalyst(s) as polymerising the fraction (A1) to form an ethylene homo- or copolymer fraction (A2);
and
wherein
(I) fraction (A1) has a lower weight average molecular weight than fraction (A2), and at least one of the catalyst(s) is a Ziegler-Natta (ZN) catalyst;
(II) the base resin has a density of 930 to 950 kg/m3;
(III) the base resin has a melt flow rate MFR21 of equal to or less than 8.0 g/10 min;
(IV) the polyethylene composition has a melt flow rate MFR5 of 0.01 to 0.3 g/10 min;
(V) the polyethylene composition has a flow rate ratio FRR21/5 of equal to or more than 20;
(VI) the ratio of the weight average molecular weight and the number average molecular weight (Mw/Mn) of the polyethylene composition is equal to or less than 30;
and
(VII) the polyethylene composition has tensile modulus less than 1000 MPa.

10 more elements

Dependencies are inferred from the claim text.

Polymer composition and a process for production of the polymer composition

Life of this patent

Polymer composition and a process for production of the polymer composition

Life of this patent

Abstract

Claims16