Metal surface treatment
The instant invention concerns the use of at least one polymer P obtained by radical copolymerization of a mixture of (i) acrylic acid; (ii) methacrylic acid; and (iii) at least one 2-hydroxyethyl methacrylate phosphate for treating a metallic surface intended to be coated by a paint, a varnish or an adhesive. The invention also concerns methods of coatings making use of this polymer P, compositions comprising the polymer P and useful for these methods, and the obtained coated materials.
1. A method, comprising treating a metallic surface intended to be coated by a paint, a varnish or an adhesive with at least one polymer P obtained by radical copolymerization of a mixture of (i) acrylic acid; (ii) methacrylic acid; and (iii) at least one 2-hydroxyethyl methacrylate phosphate of Formula (a) below:
wherein n is 1 or 2,
wherein the polymer P is obtained by radical copolymerization of a mixture having the following molar ratio, based on the total quantity of acrylic acid, methacrylic acid and 2-hydroxyethyl methacrylate phosphates of formula (a):
acrylic acid: from 80 to 90%
methacrylic acid: 5 to 15%
2-hydroxyethyl methacrylate phosphates: 2 to 6%.
2. The method of claim 1 , wherein the polymer P has a molecular weight of at least 7,500 Da.
3. The method of claim 2 , wherein the polymer P has a molecular weight of 10 kDa to 1500 kDa.
4. The method according to claim 1 , wherein the metal surface is a surface comprising a metal selected from aluminum, steel, zinc, magnesium and their alloys.
5. The method according to claim 4 , wherein the metal surface is a surface of aluminum or aluminum alloy.
6. The method according to claim 1 , wherein a conversion composition a is applied on the metallic surface for forming a conversion coating thereon, and wherein:
said conversion composition include all or part of the polymer P as an additive; and/or
the conversion coating is applied on the metallic surface, and then all or part of the polymer P is applied on the conversion coating.
7. The method of claim 1 , wherein all or part of the polymer P is present in a paint, a varnish or a coating applied on the surface.
8. The method according claim 7 , wherein all or part of the polymer P is present in a paint, a varnish or a coating applied on the surface after application of a conversion coating on the metal surface.
9. A process for coating a metal surface with a paint, a varnish or an adhesive, comprising a step of treating said surface with at least one composition including at least one polymer P, wherein polymer P is obtained by radical copolymerization of a mixture of (i) acrylic acid; (ii) methacrylic acid; and (iii) at least one 2-hydroxyethyl methacrylate phosphate of Formula (a) below:
wherein n is 1 or 2,
wherein the polymer P is obtained by radical copolymerization of a mixture having the following molar ratio, based on the total quantity of acrylic acid, methacrylic acid and 2-hydroxyethyl methacrylate phosphates of formula (a):
acrylic acid: from 80 to 90%
methacrylic acid: 5 to 15%
2-hydroxyethyl methacrylate phosphates: 2 to 6%.
10. The process according to claim 9 , wherein the process is for coating a metallic surface with a paint.
11. The process according to claim 9 , wherein the composition comprising the polymer P is:
a conversion composition including a polymer P; and/or
a solution or a dispersion of the polymer P; and/or
the paint, varnish or adhesive, that comprise a polymer P.
12. The process according to claim 11 , wherein the composition comprising the polymer P is a solution or a dispersion of the polymer P applied on the surface after having applied a conversion coating on the surface to be treated.
13. A conversion composition, paint, varnish or adhesive composition including at least one polymer P, wherein polymer P is obtained by radical copolymerization of a mixture of (i) acrylic acid; (ii) methacrylic acid; and (iii) at least one 2-hydroxyethyl methacrylate phosphate of Formula (a) below:
wherein n is 1 or 2,
wherein the polymer P is obtained by radical copolymerization of a mixture having the following molar ratio, based on the total quantity of acrylic acid, methacrylic acid and 2-hydroxyethyl methacrylate phosphates of formula (a):
acrylic acid: from 80 to 90%
methacrylic acid: 5 to 15%
2-hydroxyethyl methacrylate phosphates: 2 to 6%.
14. A material comprising a metal surface which is in all or part (i) treated with at least one polymer P and (ii) covered by a paint, a varnish or an adhesive, wherein polymer P is obtained by radical copolymerization of a mixture of (i) acrylic acid; (ii) methacrylic acid; and (iii) at least one 2-hydroxyethyl methacrylate phosphate of Formula (a) below:
wherein n is 1 or 2,
wherein the polymer P is obtained by radical copolymerization of a mixture having the following molar ratio, based on the total quantity of acrylic acid, methacrylic acid and 2-hydroxyethyl methacrylate phosphates of formula (a):
acrylic acid: from 80 to 90%
methacrylic acid: 5 to 15%
2-hydroxyethyl methacrylate phosphates: 2 to 6%.
15. The material according to claim 14 , wherein said material is a material having a metal surface in all or part covered by:
at least one coating comprising at least one polymer P;
and/or
a layer comprising a reaction product of at least one polymer P with a metal of the treated surface or another compound present in the layer.