Anti-corrosive particles
First Claim
1. A dispersion of anti-corrosive particles comprising:
- (a) fluid, and(b) anti-corrosive particles comprising inorganic oxide particles modified with polyvalent metal cations, and having at least one of (i) mesoporosity and (ii) macroporosity such that an average pore size of said anti-corrosive particles is at least 3 nm and an average pore volume of said anti-corrosive particles is at least about 0.2 ml/g.
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Accused Products
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.
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Citations
21 Claims
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1. A dispersion of anti-corrosive particles comprising:
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(a) fluid, and (b) anti-corrosive particles comprising inorganic oxide particles modified with polyvalent metal cations, and having at least one of (i) mesoporosity and (ii) macroporosity such that an average pore size of said anti-corrosive particles is at least 3 nm and an average pore volume of said anti-corrosive particles is at least about 0.2 ml/g. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A powder of anti-corrosive particles comprising:
anti-corrosive particles comprising inorganic oxide particles modified with polyvalent metal cations, and having at least one of (i) mesoporosity and (ii) macroporosity such that an average pore size of said anti-corrosive particles is at least 3 nm and an average pore volume of said anti-corrosive particles is at least about 0.2 ml/g. - View Dependent Claims (14, 15)
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16. A dispersion of anti-corrosive particles comprising:
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(a) fluid, and (b) anti-corrosive inorganic oxide particles having at least one of (i) mesoporosity and (ii) macroporosity such that said particles have an average pore size of at least 3 nm and an average pore volume of at least about 0.2 ml/g, said particles being modified with polyvalent metal cations, and optionally comprising inorganic or organic anions of weak acids and their conjugate species defined in terms of a number of moles of an ith cation, anion or oxide represented by symbols mic, mia and mio respectively;
a 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 dispersion;
Σ
mic=mc
Σ
mia=ma
Σ
mio=mo where mc ,ma andmo , are a total number of moles of cations, anions and oxides respectively;mc,a andm c,o are a total number of moles of cations associated with the anion and oxide respectively;
a proportion of the ith cation, anion and oxide as a fraction of the total number of cations, anions and oxides ci, ai, and oi; - View Dependent Claims (17, 18, 19, 20, 21)
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Specification