Process for forming a copolymer-based anticorrosion coating on a metal surface and the products thus obtained

Claim 2

A process for imparting protection against corrosion for a minimum period of two months to a metal surface and for decreasing the friction coefficient of said metal surface, comprising coating said metal surface with a layer of a solution comprising a solvent and a block copolymer made up of at least two blocks, the first block being based on a siloxane monomer and the second block consisting essentially of monomers selected from the group consisting of acrylic and vinyl monomers.

Claim 3

A process according to claim 1, wherein the siloxane monomer is dimethylsiloxane.

Claim 4

A process according to claim 1, wherein the first block consists essentially of a siloxane monomer and acrylic or vinyl monomers and the second block consists essentially of acrylic or vinyl monomers.

Claim 5

A process according to claim 1, wherein said acrylic monomers are selected from the group consisting of methyl methacrylate, butyl methacrylate and hydroxyethyl methacrylate.

Claim 6

A process according to claim 3, wherein said acrylic monomers of the first block are selected from the group consisting of methyl methacrylate, butyl methacrylate and hydroxyethyl methacrylate.

Claim 7

A process according to claim 1, wherein the block copolymer consists of (i) a first block consisting of 30-50 wt % methyl methacrylate, 0-20 wt % hydroxyethyl methacrylate and 40-60 wt % dimethylsiloxane monomers, and (ii) a second block consisting of 30-50 wt % methyl methacrylate, 30-50 wt % butyl methacrylate and 10-30 wt % hydroxyethyl methacrylate.

Claim 8

A process according to claim 1, wherein the copolymer consists of (i) a first block which consists of methyl methacrylate, hydroxyethyl methacrylate and dimethylsiloxane, whose proportions by weight in said block are 40, 10 and 50% respectiely, the block (i) representing 60% by weight of the copolymer, and (ii) a second block which consists of methyl methacrylate, butyl methacrylate and hydroxyethyl methacrylate, whose proportions by weight in the said second block are 40, 40 and 20% respectively, the block (ii) representing 40% by weight of the copolymer.

Claim 9

A process according to claim 1, wherein said solvent is selected from the group consisting of ketones, esters, chloroalkanes, and aromatic compounds.

Claim 10

A process according to claim 1, wherein said solvent is selected from the group consisting of acetone, methyl ethyl ketone and cyclohexanone.

Claim 11

A process according to claim 1, wherein said solvent is selected from the group consisting of ethyl acetate and butyl acetate.

Claim 12

A process according to claim 1, wherein said solvent is l,l,l-trichloroethane.

Claim 13

A process according to claim 1, wherein said solvent is selected from the group consisting of toluene and xylene.

Claim 14

A process according to claim 1, wherein the solution contains from 2 to 10 g/l of copolymer.

Claim 15

A process according to claim 1, wherein the solution is heated to a temperature of between 20 and 40° C. before being applied to the metal surface.

Claim 16

A process according to claim 1, wherein the coating of said metal surface with a layer of solution is performed by one of the following methods: by spraying with a gun, by dipping, by rotation, by coating with a brush or roller, by enamelling as a strip.

Claim 17

A process according to claim 1, wherein said layer is dried at a temperature of between 70 and 100° C. after coating the metal surface.

Claim 18

A coated metal surface obtained by the process according to claim 1, wherein said coating has a thickness of between 0.01 μm and 3 μm.