Process for providing an extended tubular article with a corrosion protection coating system having self-repairing properties

摘要

The present invention relates to a process for providing an extended tubular article or one or more sections of the extended tubular article with a corrosion protecting system, wherein (a) a layer of an adhesive composition is applied to the surface of the extended tubular article or the one or more sections of the extended tubular article, and (b) a corrosion protecting layer is applied to the layer of the adhesive composition, the adhesive composition comprising a polyolefin blend, wherein the polyolefin blend comprises 30% to 100% by weight of a polyisobutene and 0% to 70% by weight of an olefin polymer, based on the total weight of the polyolefin blend, wherein said polyisobutene is has a glass transition temperature of lower than −40° C. and a number average molecular weight Mn of 1300 to 1.000.000.

主权项

1. A process for improving the adhesion between an extended tubular article or a section thereof and a corrosion protecting system, the process comprising:
(a) applying a layer of an adhesive composition to a surface of the extended tubular article or a section thereof; and, subsequently, (b) applying a corrosion protecting layer to the layer of the adhesive composition, wherein the adhesive composition comprises a polyolefin blend, wherein the polyolefin blend comprises 30% to 100% by weight of a polyisobutene and 0% to 70% by weight of one or more olefin polymers, based on the total weight of the polyolefin blend, wherein the polyisobutene has the following properties (i) to (v):
(i) a glass transition temperature of lower than −40° C.;(ii) a number average molecular weight Mn of 1,300 to 1,000,000;(iii) a molecular weight distribution Mw/Mn of between 1 to 10;(iv) a surface tension of less than 40 mN/m at 20° C.; and(v) a density between 0.90 to 0.95 g/cm3; wherein the corrosion protecting layer comprises a polyisobutene and 40 to 80% by weight of a filler material, based on the total weight of the corrosion protecting layer; and wherein the adhesive composition either comprises 1 to 10% by weight of a filler, based on the total weight of the adhesive composition, or consists of the polyolefin blend.