초록 ▼

A process for coating metallic substrates in several stages with heat-hardenable synthetic resins having functional groups from the group comprising hydroxyl-containing polyesters, crosslinkable acrylate resins and epoxy resins, thermally stabilized ethylene copolymers and, if appropriate, polyolefi

A process for coating metallic substrates in several stages with heat-hardenable synthetic resins having functional groups from the group comprising hydroxyl-containing polyesters, crosslinkable acrylate resins and epoxy resins, thermally stabilized ethylene copolymers and, if appropriate, polyolefins, in which, in the first stage, a powder mixture of these components is applied to a metallic substrate at a preheating temperature which is above the melting point of the (A) resins and which is adequate for their crosslinking, and, in the second stage, an olefin polymer layer is applied to the hot, coated substrate. The metallic substrates are pipes, large moldings, vessels and building elements, the coated pipes being advantageously used as pipelines for petroleum and natural gas.

대표청구항 ▼

A process for coating metallic substrates which comprises applying in a first stage and powder mixture based on (A) 10-45% by weight of at least one heat-hardenable synthetic resin having functional groups selected from the group consisting of hydroxyl-containing polyesters, epoxy resins, both in co

A process for coating metallic substrates which comprises applying in a first stage and powder mixture based on (A) 10-45% by weight of at least one heat-hardenable synthetic resin having functional groups selected from the group consisting of hydroxyl-containing polyesters, epoxy resins, both in combination with hardening agents and crosslinkable acrylate resins per se or in combination with hardening agents, (B) 55-90% by weight of at least one stabilized ethylene copolymer based on ethylene and vinyl compounds and (C) 0-25% by weight of polyolefin, relative to the total amount of components (A) and (B), to a metallic substrate pre-heated to a temperature which is above the melting point of the resins (A) and which is adequate for their crosslinking, to form a first layer and applying, in a second state, a layer of an olefin polymer in the form of a tape or as a powder to the hot, coated substrate. Metallic substrates in the form of pipes coated by the process as claimed in claim 1.