Polyethylene molding composition for coating steel pipes

Details Polyethylene molding composition for coating steel pipes Polyethylene molding composition for coating steel pipes

2011-01-18

2011-01-18

Rabago, Roberto (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000, C525S242000, C525S319000, C525S321000, C525S322000, C525S324000, C526S065000

Reexamination Certificate

active

07872071

ABSTRACT:
The invention relates to a polyethylene molding composition which has a multimodal molar mass distribution and is particularly suitable for producing protective coatings on steel pipes. The molding composition has a density at a temperature of 23° C. in the range from 0.94 to 0.95 g/cm3and an MFI190/5in the range from 1.2 to 2.1 dg/min. It comprises from 45 to 55% by weight of a low molecular weight ethylene homopolymer A, from 30 to 40% by weight of a high molecular weight copolymer B of ethylene and another olefin having from 4 to 8 carbon atoms and from 10 to 20% by weight of an ultra high molecular weight ethylene copolymer C.

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