# US 2018/0022941 A1 · Method of forming a slurry of encapsulated pigment for an aqueous topcoat coating composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022941 A1 - Document ID: US20180022941A1 - Status: Published application - Kind: A1 - Application number: 15/218,350 - Filed: 2016-07-25 - Published: 2018-01-25 - Earliest claimed: 2016-07-25 - Assignees: BASF Coatings GmbH - Applicants: BASF Coatings GmbH - Inventors: Donald H. Campbell; Prasad Ramana; Rajesh Rahtod; Paragkumar Thanki - Web page: https://patentgrep.com/patent/US20180022941A1 ## CPC - C09D 5/36: Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre - C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes - C09D 5/084: {Inorganic compounds} - C09D 5/086: {Organic or non-macromolecular compounds} - C09D 7/41: Organic pigments; Organic dyes - C09D 133/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof - C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence) - C09D 175/06: from polyesters - C23C 16/56: After-treatment - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract A method of forming a passivated pigment slurry includes combining a resin and a pigment to form a pigment-resin slurry, wherein the pigment includes a plurality of flakes each having a surface. After combining, the method includes firstly reacting an orthosilicate and the pigment in the presence of the resin to form a coated pigment-resin slurry. The coated pigment-resin slurry includes the resin and a coated pigment including the plurality of flakes each encapsulated by a first layer formed from the orthosilicate on the surface. The method further includes, concurrent to or after firstly reacting, secondly reacting the coated pigment-resin slurry and an organosilane compound having a hydrolysable group and an organic group to coat the first layer and form the passivated pigment slurry. The passivated pigment slurry includes the resin and a passivated pigment including the plurality of flakes each coated with a second layer disposed on the first. ## Claims ### Claim 1 A method of forming a passivated pigment slurry for an aqueous topcoat coating composition, the method comprising: combining a resin and a pigment to form a pigment-resin slurry, wherein the pigment includes a plurality of flakes each having a surface; after combining, firstly reacting an orthosilicate and the pigment in the presence of the resin to form a coated pigment-resin slurry, wherein the coated pigment-resin slurry includes: the resin; and a coated pigment including the plurality of flakes each encapsulated by a first layer formed from the orthosilicate and disposed on the surface; and concurrent to or after firstly reacting, secondly reacting the coated pigment-resin slurry and an organosilane compound having a hydrolysable group and an organic group to coat the first layer and thereby form the passivated pigment slurry, wherein the passivated pigment-resin slurry includes: the resin; and a passivated pigment including the plurality of flakes each coated with a second layer disposed on the first layer. ### Claim 2 (depends on 1) The method of claim 1, wherein combining includes slurrying the pigment and the resin at a weight ratio of parts by weight pigment to parts by weight resin of from about 100:30 to about 30:100. ### Claim 3 (depends on 1) The method of claim 1, wherein firstly reacting includes mixing a solvent, the orthosilicate, and the pigment in the presence of the resin. ### Claim 4 (depends on 1) The method of claim 1, wherein combining further includes slurrying a first amine having a logarithmic acid dissociation constant, pKa, of greater than or equal to 9, a second amine having a pKa of less than 9, the pigment, and the resin. ### Claim 5 (depends on 1) The method of claim 1, wherein firstly reacting includes blending the pigment-resin slurry and the orthosilicate at a temperature of from about 10° C. to about 100° C. for a duration of from about 30 minutes to about 200 hours. ### Claim 6 (depends on 1) The method of claim 1, wherein firstly reacting includes blending about 60 parts by weight of the orthosilicate and about 100 parts by weight of the pigment. ### Claim 7 (depends on 1) The method of claim 1, wherein firstly reacting includes forming the first layer such that the first layer is present in the coated pigment in an amount of from about 10 parts by weight to about 25 parts by weight based on 100 parts by weight of the pigment. ### Claim 8 (depends on 1) The method of claim 1, wherein secondly reacting includes blending the coated pigment-resin slurry and the organosilane compound in a weight ratio of parts by weight organosilane compound to parts by weight plurality of flakes of from about 0.05:100 to about 10:100. ### Claim 9 (depends on 1) The method of claim 1, wherein secondly reacting includes blending the coated pigment-resin slurry and the organosilane compound at a temperature of from about 10° C. to about 100° C. for a duration of from about 30 minutes to about 200 hours. ### Claim 10 (depends on 1) The method of claim 1, wherein the surface is formed from aluminum. ### Claim 11 (depends on 10) The method of claim 10, further including, before or concurrent to firstly reacting, oxidizing the surface. ### Claim 12 (depends on 1) The method of claim 1, wherein the surface is formed from titanium dioxide coated on a mica. ### Claim 13 (depends on 1) The method of claim 1, wherein the surface is formed from a metal oxide coated on aluminum. ### Claim 14 (depends on 1) The method of claim 1, wherein firstly reacting includes forming the first layer so that the first layer has a thickness of from about 5 nm to about 50 nm. ### Claim 15 A method of forming an aqueous topcoat coating composition, the method comprising: combining a resin and a pigment to form a pigment-resin slurry, wherein the pigment includes a plurality of flakes each having a surface; after combining, firstly reacting an orthosilicate and the pigment in the presence of the resin to form a coated pigment-resin slurry, wherein the coated pigment-resin slurry includes: the resin; and a coated pigment including the plurality of flakes each encapsulated by a first layer formed from the orthosilicate and disposed on the surface; concurrent to or after firstly reacting, secondly reacting the coated pigment-resin slurry and an organosilane compound having a hydrolysable group and an organic group to coat the first layer and thereby form the passivated pigment slurry, wherein the passivated pigment slurry includes: the resin; and a passivated pigment including the plurality of flakes each coated with a second layer disposed on the first layer; and blending the passivated pigment slurry, water, and at least one water-miscible film-forming binder to form the aqueous topcoat coating composition. ### Claim 16 (depends on 15) The method of claim 15, further including, prior to blending, storing the passivated pigment slurry in a container for longer than 15 consecutive days. ### Claim 17 (depends on 16) The method of claim 16, wherein the container has a volume, and further including, prior to blending, storing the passivated pigment slurry in the container for longer than 30 consecutive days such that the passivated pigment slurry settles to define a first portion that is substantially free from the plurality of flakes and a second portion that includes the plurality of flakes, and further wherein the second portion occupies greater than or equal to 75% of the volume. ### Claim 18 (depends on 15) The method of claim 15, further including blending a colloidal layered silicate, the passivated pigment slurry, water, and the at least one water-miscible film-forming binder. ### Claim 19 (depends on 15) The method of claim 15, further including, prior to blending, exposing the passivated pigment slurry to water without corroding the passivated pigment slurry. ### Claim 20 (depends on 15) The method of claim 15, wherein blending includes adding to water from about 0.1 part by weight passivated pigment to about 30 parts by weight passivated pigment based on 100 parts by weight of the at least one water-miscible film-forming binder. ### Claim 21 A method of forming an aqueous topcoat coating system, the method comprising: combining a resin and a pigment to form a pigment-resin slurry, wherein the pigment includes a plurality of flakes each having a surface; after combining, firstly reacting an orthosilicate with the pigment in the presence of the resin to form a coated pigment-resin slurry, wherein the coated pigment-resin slurry includes: the resin; and the plurality of flakes each encapsulated by a first layer formed from the orthosilicate and disposed on the surface; concurrent to or after firstly reacting, secondly reacting the coated pigment-resin slurry and an organosilane compound having a hydrolysable group and an organic group to coat the first layer and thereby form the passivated pigment slurry, wherein the passivated pigment slurry includes: the resin; and the plurality of flakes each coated with a second layer disposed on the first layer; blending the passivated pigment slurry, water, and at least one water-miscible film-forming binder to form an aqueous topcoat coating composition; applying a film formed from the aqueous topcoat coating composition to a substrate; and curing the film to form the aqueous topcoat coating system. ### Claim 22 (depends on 21) The method of claim 21, wherein the aqueous topcoat coating system includes the substrate and a cured film formed from the aqueous topcoat coating composition and disposed on the substrate, and further including, after curing, exposing the cured film to light without photo-degrading the cured film.