ANTI-CORROSIVE PARTICLES

• US 20110233473A1
• Filed: 12/08/2009
• Published: 09/29/2011
• Est. Priority Date: 12/08/2008
• Status: Active Grant

• Current Assignee: Grace GmbH & Co. KG
• Original Assignee: Grace GmbH & Co. KG
• Inventors: Fletcher, Timothy E.
• Granted Patent: US 9,403,994 B2
• Time in Patent Office: Days
• US Class Current: 252/389.1
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/14 Pore volume
• CPC Class Codes: C01P 2006/16 Pore diameter
• CPC Class Codes: C09C 1/3045 Treatment with inorganic compounds
• CPC Class Codes: C09C 1/3653 Treatment with inorganic compounds
• CPC Class Codes: C09C 1/40 Compounds of aluminium C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence
• CPC Class Codes: C09D 5/082 characterised by the anti-corrosive pigment

Abstract

The present invention relates to anti-corrosive particles based on inorganic oxide products such as silica or alumina modified with polyvalent metal cations optionally comprising anions of weak acids which may be inorganic or organic in nature and their conjugate species. In particular, the present invention is concerned with anti-corrosive pigment particles comprising inorganic oxides or mixtures of inorganic oxides displaying mesoporosity and/or macroporosity such that the average pore size, averaged over the mixture of inorganic oxides where more than one oxide is involved is greater than 2 nm and the average pore volume is greater than 0.2 ml/g. The present invention is also related to methods of making such particles and to anti-corrosive compositions made with them. The present invention further relates to articles to which the anti-corrosive compositions have been applied.

Claims

1. A dispersion of anti-corrosive particles comprising:

(a) fluid, and

(b) anti-corrosive particles comprising inorganic oxides having mesoporosity and/or macroporosity such that the average pore size is at least about 2 nm and an average pore volume of at least about 0.2 ml/g.

2. A dispersion according to claim 1, wherein said average pore size is at least about 3 nm.

3. A dispersion according to claim 1, wherein said average pore size is between about 4 nm and 50 nm.

6. A dispersion according to claim 1, wherein the inorganic oxide particles comprise precipitated silica or a mixture of inorganic oxide particles at least one component of which is precipitated silica.

8. A dispersion according to claim 1, wherein the inorganic oxide particles comprise silica gel or a mixture of inorganic oxide particles at least one component of which is silica gel.

10. A dispersion according to claim 1, wherein said fluid comprises water, complexing agent, binder, film former, bacteriacide or polymer.

11. A dispersion according to claim 1, wherein said particles have an average particle size of less than about 10 μ

m.

12. A dispersion according to claim 1, wherein said particles have an average particle size of less than about 1 μ

m.

13. A dispersion according to claim 11, wherein said average pore volume is from about 0.2 ml/g to about 3 ml/g.

14. A dispersion according to claim 11, wherein said average pore volume is from about 0.4 ml/g and 1.2 ml/g.

16. A coating comprising the dispersion of claim 1.

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17. A dispersion of anti-corrosive particles comprising:

(a) fluid, and

(b) anti-corrosive inorganic oxide particles having mesoporosity and/or macroporosity such that the average pore size is at least about 2 nm and an average pore volume of at least about 0.2 ml/g modified with polyvalent metal cations, optionally comprising inorganic or organic anions of weak acids and their conjugate species defined in terms of the number of moles of the i^th cation, anion or oxide represented by the symbols m_i^c, m_i^a and m_i^o respectively;

the total number of moles of each component given by the sum over all cations, anions and oxides that are to be employed where an upper bar signifies that more than one cation, anion or oxide may be involved in the pigment composition

Σ

m_i^c= m_c

Σ

m_i^a= m_a

Σ

m_i^o= m_o

where m_c, m_a and m_o are the total number of moles of cations, anions and oxides respectively;

m_c,a and m_c,o the total number of moles of cations associated with the anion and oxide respectively;

the proportion of the i^th cation, anion and oxide as a fraction of the total number of cations, anions and oxides c_i, a_i and o_i

18. A dispersion according to claim 17, wherein said average pore size is at least about 2 nm.

19. A dispersion according to claim 17, wherein said average pore size is at least about 3 nm.

20. A dispersion according to claim 17, wherein said average pore size is between about 4 nm and 50 nm

22. A dispersion according to claim 17, wherein the inorganic oxide comprises silica, alumina, titanium, or mixtures thereof.

23. A dispersion according to claim 17, wherein the inorganic oxide particles comprise precipitated silica or a mixture of inorganic particles at least one component of which is precipitated silica.

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36. A powder of anti-corrosive particles comprising:

(a) anti-corrosive particles comprising inorganic oxides having mesoporosity and/or macroporosity such that the average pore size is at least about 2 nm and an average pore volume of at least about 0.2 ml/g.

37. A powder according to claim 36, wherein said average pore size is at least about 3 nm.

38. A powder according to claim 36, wherein said average pore size is between about 4 nm and 50 nm.

49. A coating comprising the powder of claim 36.

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