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US 10,240,048 B2Granted
Corrosion-inhibiting microgels and non-chromated primer compositions incorporating the same
AssigneeCytec Industries Inc.
InventorsYiqiang Zhao, Dalip Kohli, Keltoum Ouzineb
Life of this patent
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Abstract
Corrosion-inhibiting microgels that are suitable for use in non-chromated primer compositions. Each discrete microgel is composed of a cross-linked polymer network and organic corrosion-inhibiting compounds entrapped or immobilized within the polymer network.
Claims15
A discrete, corrosion-inhibiting microgel comprising:
- a cross-linked polymer network created by emulsion polymerization of monomers selected from:
- mono-functional or bi-functional acrylic monomers;
- mono-functional or bi-functional methacrylic monomers;
- mono-functional vinyl monomers, and combinations thereof;
- and
- organic corrosion-inhibiting compounds entrapped or immobilized within the polymer network,
- wherein emulsion polymerization is carried out in the presence of an initiator for free radical polymerization and cross-linking monomers selected from:
- diacrylates;
- dimethacrylates;
- triacrylates;
- trimethacrylates;
- dipentaerythritol pentaacrylate;
- pentaerythritol tetraacrylate;
- derivatives of methylenebisacrylamide;
- and combinations thereof,
- wherein the corrosion-inhibiting compounds are releasable from the polymer network upon exposure to a corrosion-triggering condition selected from:
- pH change, moisture exposure, temperature increase, and combination thereof.
14 more elements
A method for forming corrosion-inhibiting microgels, said method comprising:
- a) forming discrete microgels by emulsion polymerization of monomers selected from:
- mono-functional or bi-functional acrylic monomers;
- mono-functional or bi-functional methacrylic monomers;
- mono-functional vinyl monomers, and combinations thereof;
- b) dissolving an organic corrosion inhibitor in an aqueous medium containing an organic solvent and water;
- c) mixing the microgels with the aqueous medium, causing the microgels to swell and the organic corrosion inhibitor compounds to become entrapped or immobilized within the polymer networks;
- and
- d) stripping off the solvent to produce a latex emulsion with microgels of smaller particle sizes,
- wherein emulsion polymerization at (a) is carried out in the presence of an initiator for free radical polymerization and cross-linking monomers selected from:
- diacrylates;
- dimethacrylates;
- triacrylates;
- trimethacrylates;
- dipentaerythritol pentaacrylate;
- pentaerythritol tetraacrylate;
- derivatives of methylenebisacrylamide;
- and combinations thereof.
14 more elements
Dependencies are inferred from the claim text.