Borealis Ag

Winn & Coales International Limited

J. Van Beugen Beheer B.v.

Norbert Jansen

Leif Leiden

Jouni Purmonen

Leonard Van Beugen

Tua Sundholm

Edwin Welles

The present invention provides a metal pipe coated on at least a section of the metal pipe with a polyolefin coating system, wherein the system consists of the following layers: (a) optionally, a corrosion protective layer of a chromate, phosphate or other salt; (b) a polyolefin based adhesive, preferably in a thickness of 0.3-5 mm; (c) a PE or PP coating layer, preferably in a thickness of 1-10 mm; (d) optionally, an adhesion promoting layer between the polyolefin based adhesive and a PE or PP layer; wherein the polyolefin based adhesive contains an organic phase consisting of substantially saturated hydrocarbons, and wherein the adhesive contains amorphous polypropylene, ethylene-propylene copolymers or poly(iso)butylene (co)polymers, said adhesive being flowable when a pressure of 10 kgf/cmis applied, wherein the PE or PP coating is a continuous layer over the coated section, and wherein said polyolefin based adhesive adheres to both the metal pipe and to said PE or PP coating.

Metal pipes with anticorrosive polyolefin covering layer

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

Growing community of inventors

Wassenberg, Germany

Norbert Jansen