METHOD TO APPLY COATING ONTO PIPES WITH HIGH THROUGHPUT CAPACITY USING MULTIMODAL COPOLYMER OF ETHYLENE AND COATED PIPES PRODUCED BY THIS METHOD Russian patent published in 2012 - IPC C09D123/06 C09D123/08 F16L58/10 

FIELD: construction.

SUBSTANCE: pipe comprises an inner surface, an outer surface layer (A) and a coating layer (B), coated with the above outer surface layer (A). The coating layer (B) contains a coating composition (B-2), including a multimodal copolymer of ethylene (B-1). The multimodal copolymer of ethylene (B-1) is a copolymer of ethylene and one or more comonomers of alpha-olefins having from 4 to 10 atoms of carbon and has an average weighted molecular mass from 70000 g/mole to 250000 g/mole, the ratio of the average weighted molecular mass to the number average molecular weight, Mw/Mn, from 15 to 50, melt index MFR₂, determined in compliance with ISO 1133 at 190°C and the load of 2.16 kg, from 0.05 g/10 min to 5 g/10 min, melt index MFR₅, determined in accordance with ISO 1133 at 190°C and the load of 5 kg, from 0.5 to 10 g/10 min, the density from 930 kg/m³ to 955 kg/m³.

EFFECT: pipes with coating have higher mechanical strength and may be manufactured with high throughput capacity and high efficiency of production.

30 cl, 1 dwg, 2 tbl