Coating compositions with anticorrosion properties

Backlog Materiais, Metalurgia Química Química básica do material Tecnologia de superfície, Revestimento

Coating compositions with anticorrosion properties

NOVELTY – Anticorrosive coating composition comprises a binding polymer, aluminum phosphate (1-25 wt.%) dispersed within the binding polymer, where: the aluminum phosphate consists of amorphous aluminum phosphate when the coating composition is applied to a metallic substrate; and the coating composition provides a controlled phosphate delivery of 50-500 ppm when applied to the metallic substrate and when contacted with water and oxygen. USE – The coating composition is useful for forming a primer coating, which is disposed on the metallic substrate; forming a mid-coat or top-coat of a coating system, where the midcoat or top-coat is in contact with the metallic substrate or the primer layer disposed on it (all claimed). ADVANTAGE – The composition: provides a desired degree of corrosion control/resistance without the use of materials that are hazardous to the environment and/or health or safety issues of people; and can be manufactured in a economical manner without the use of exotic equipment and more labor. DETAILED DESCRIPTION – INDEPENDENT CLAIMS are included for: (1) a system, for providing anticorrosion protection, comprising a coating composition applied to a metallic substrate and allowed to cure to form a film, where the cured coating composition comprises a binding polymer having an amorphous aluminum phosphate corrosion inhibiting pigment dispersed in it, the amorphous aluminum phosphate comprises amorphous aluminum hydroxyl phosphate, the coating composition comprises 1-25 wt.% of amorphous aluminum phosphate, and the coating composition has a controlled delivery of phosphate anion of less than 500 ppm; (2) preparing the coating composition, comprising preparing an amorphous aluminum phosphate corrosion inhibiting pigment by combining starting materials comprising an aluminum source with a phosphorus source and an alkaline solution and reacting the combined starting materials to form a solution comprising an amorphous aluminum phosphate precipitate, treating the amorphous aluminum phosphate precipitate to reduce total solubles to less than 1500 ppm, drying the precipitate at a temperature of less than 300 degrees C, where the dried precipitate comprises amorphous aluminum orthophosphate and mixing the amorphous aluminum orthophosphate with a binding polymer to form the coating composition; and (3) method-I of preparing an anticorrosion coating composition comprising preparing an amorphous aluminum orthophosphate corrosion inhibiting pigment by combining starting materials comprising sodium aluminate, phosphoric acid and sodium hydroxide to form a solution comprising an aluminum orthophosphate precipitate, treating the precipitate to reduce the level of total soluble to less than 1500 ppm, drying the precipitate at a temperature of less than 300 degrees C, where the dried precipitate comprises amorphous aluminum orthophosphate, sizing the dried amorphous aluminum orthophosphate to have a particle size of 0.01-25 microns and mixing the amorphous aluminum orthophosphate with a binding polymer to form the coating composition, which constitutes less than 25 wt.% of the total weight of the coating composition.

Main Application Field

A82 (Coatings, impregnations, polishes – excluding textile finishing.); G02 (Inks, paints, polishes – polymer-based paints and inks are also classified in Section A (C09D, F, G).); E33 (Compounds of Be, Mg, Ca, Sr, Ba, Ra, Sc, Y, La, Ac, Al, lanthanides (Rare-earths), Th.); M14 (Other chemical surface treatments – including etching, brightening, forming non-metallic layers, passivation, cathodic protection and corrosion inhibitors, but not processes specifically for semiconductor production (C23F, C25). This Section also covers multistage processes.); P73 (Layered products (B32).)

INVENTORS:

FOSCANTE RAYMOND E
GALEMBECK FERNANDO
BRAGA MELISSA

#N/D

Patent number: US2012094130-A1;WO2012051573-A1;AU2011315905-A1;CA2814691-A1;EP2627716-A1;MX2013004201-A1;JP2013543029-W;SG189893-A1;CN103476879-A;KR2014022763-A;HK1188805-A0;IN201304307-P1;IL225741-A;EP2627716-B1;NZ610568-A;ES2546238-T3;EP2985320-A1;SG189893-B;AU2011315905-B2;BR112013009034-A2;ID201402650-A;EP2985320-B1;MX346948-B;JP2017137500-A

PATENT STATUS:

GRANTED

FOR ADDITIONAL INFORMATION:

parcerias@inova.unicamp.br

+55 (19) 3521-5207 / 2607

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