Metal surface treatment

Patent metadata

Field	Value
Publication number	US-12018176-B2
Application number	US-201917293537-A
Country	US
Kind code	B2
Filing date	Nov 27, 2019
Priority date	Nov 27, 2018
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Specialty Operations France

Inventors

• Labeau Marie-Pierre

Classifications

• C23C22/83 Primary

  Chemical after-treatment · CPC title

• C23C22/78

  Pretreatment of the material to be coated · CPC title

• C23C22/36

  containing also phosphates · CPC title

• C09D133/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C09D5/002

  Priming paints (C09D5/08 takes precedence) · CPC title