Anti-corrosion pigments made of aluminium polyphosphate and rare earth

• US 10,442,933 B2
• Filed: 04/07/2016
• Issued: 10/15/2019
• Est. Priority Date: 04/08/2015
• Status: Active Grant

• Current Assignee: Société Nouvelle des Couleurs Zinciques
• Original Assignee: Société Nouvelle des Couleurs Zinciques
• Inventors: Berteloot, Christelle, Mavel, Ludovic
• Primary Examiner(s): Parvini, Pegah
• Application Number:
  US15/563,931
• Publication Number:
  US 20180127588A1
• Time in Patent Office: 1,286 Days
• CPC Class Codes: C01B 25/40 Polyphosphates
• CPC Class Codes: C01F 17/224 Oxides or hydroxides of lanthanides
• CPC Class Codes: C01F 17/229 Lanthanum oxides or hydroxides
• CPC Class Codes: C01F 17/235 Cerium oxides or hydroxides
• CPC Class Codes: C08K 2003/221 of rare earth metal
• CPC Class Codes: C09B 67/0007 with inorganic coatings
• CPC Class Codes: C09B 69/001 Dyes containing an onium group attached to the dye skeleton via a bridge
• CPC Class Codes: C09C 1/40 Compounds of aluminium C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence
• CPC Class Codes: C09C 1/64 Aluminium
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• CPC Class Codes: C09D 167/00 Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain based on polyester-amides C09D177/12; based on polyester-imides C09D179/08; Coating compositions based on derivatives of such polymers
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 5/084 Inorganic compounds
• CPC Class Codes: C09D 7/61 inorganic

Abstract

An anticorrosive pigment comprising an aluminum polyphosphate comprises at least one cerium-based compound and/or one lanthanum-based compound and/or one praseodymium-based compound. An anticorrosive paint incorporating the pigment is also provided.

Claims

1. An anticorrosive pigment consisting of an aluminum tripolyphosphate, and at least one cerium-based compound and/or one lanthanum-based compound and/or one praseodymium-based compound.

2. The anticorrosive pigment as claimed in claim 1, wherein the compound is an oxide.

3. The anticorrosive pigment as claimed in claim 1, wherein the compound is a carbonate.

4. The anticorrosive pigment as claimed in claim 2, comprising a cerium oxide.

5. The anticorrosive pigment as claimed in claim 4, comprising cerium oxide or CeO₂.

6. The anticorrosive pigment as claimed in claim 2, comprising a lanthanum oxide.

7. The anticorrosive pigment as claimed in claim 6, comprising lanthanum oxide or La₂O₃.

8. The anticorrosive pigment as claimed in claim 2, comprising a praseodymium oxide.

9. The anticorrosive pigment as claimed in claim 8, comprising praseodymium oxide or Pr₆O₁₁.

10. The anticorrosive pigment as claimed in claim 1, comprising a mixture of cerium-based compound and of lanthanum-based compound.

11. The anticorrosive pigment as claimed in claim 1, comprising a mixture of cerium-based compound and of praseodymium-based compound.

12. The anticorrosive pigment as claimed in claim 1, comprising a mixture of lanthanum-based compound and of praseodymium-based compound.

13. The anticorrosive pigment as claimed in claim 1, comprising a mixture of cerium-based compound and of lanthanum-based compound and of praseodymium-based compound.

14. The anticorrosive pigment as claimed in claim 1, comprising a percentage by weight of the at least one cerium-based compound and/or the lanthanum-based compound and/or the praseodymium-based compound is between 1% and 30%.

15. An anticorrosive paint intended to cover a metal surface, comprising an anticorrosive pigment as claimed in claim 1.

16. The anticorrosive paint as claimed in claim 15, wherein it is based on polyester-melamine.

17. The anticorrosive paint as claimed in claim 15, wherein it is based on polyurethane.

18. The anticorrosive paint as claimed in claim 15, wherein it is epoxy-based.

19. The anticorrosive paint as claimed in claim 15, comprising a percentage by weight of anticorrosive pigment of between 1% and 15%.