# US 10,501,636 B2 · Solar reflective particulates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,501,636 B2 - Document ID: US10501636B2 - Status: Granted - Kind: B2 - Application number: 15/894,650 - Filed: 2018-02-12 - Published: 2018-06-14 - Granted: 2019-12-10 - Earliest claimed: 2015-12-08 - Assignees: U.S. Silica Company - Applicants: U.S. Silica Company - Inventors: Rhonda Marie Jenree; Rocky Lee Smith; David Earl Weller, Jr.; Shih-Jen Wu - Web page: https://patentgrep.com/patent/US10501636B2 ## CPC - C09C 3/06: Treatment with inorganic compounds {(C09C3/006, C09C3/048 take precedence)} - C09C 1/42: Clays - 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 7/62: modified by treatment with other compounds - C09D 133/00: Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers - E04D 7/005: {characterised by loose or embedded gravel or granules as an outer protection of the roof covering} - C08K 13/06: Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00 - Y02A 30/254: Roof garden systems; Roof coverings with high solar reflectance - Y02B 80/00: Architectural or constructional elements improving the thermal performance of buildings - C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS} - 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) - E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A reflective particulate composition includes a particulate substrate, and an inorganic binder, a pigment, and a hydrophobic coating on the particulate substrate. The composition may have a solar reflectance of 70% or greater. The pigment may include a clay, and the hydrophobic coating may include a (meth)acrylic polymer, a coupling agent, a wax and an antioxidant. A method of making the composition may include mixing the pigment, the inorganic binder, a dispersant and water to form a pigment mixture, adding the particulate substrate to the pigment mixture, heat treating the pigmented particulate, and mixing the pigmented particulate with a hydrophobic coating composition. Alternatively, the method may include first mixing the particulate substrate with one of the inorganic binder or the pigment, and then mixing the resulting composition with the other of the inorganic binder and the pigment, and heat treating the pigmented particulate. ## Claims ### Claim 1 A reflective particulate composition, comprising: a particulate substrate; an inorganic binder coated on the particulate substrate; a pigment coated on the particulate substrate; and a hydrophobic exterior coating on the particulate substrate the hydrophobic exterior coating comprising a (meth)acrylic polymer, a wax, a coupling agent, and an antioxidant, wherein the antioxidant comprises an alkali or alkaline earth metal salt of hypophosphorous acid. ### Claim 2 (depends on 1) The reflective particulate composition according to claim 1, wherein the reflective particulate composition has a solar reflectance of 70% or greater. ### Claim 3 (depends on 1) The reflective particulate composition according to claim 1, wherein the particulate substrate has a particle size distribution in which a majority of particles of the particulate substrate have a size between 12 and 50 mesh. ### Claim 4 (depends on 1) The reflective particulate composition according to claim 1, wherein the particulate substrate comprises silica in an amount of 50% by weight or greater based on 100% by weight of the particulate substrate. ### Claim 5 (depends on 1) The reflective particulate composition according to claim 1, wherein the inorganic binder is selected from the group consisting of alkali metal silicates, alkali metal carbonates, alkali metal sulfates, alkaline earth metal silicates, alkaline earth metal carbonates, alkaline earth metal sulfates, boric acid, Portland cement, alkyl silicates, and combinations thereof. ### Claim 6 (depends on 1) The reflective particulate composition according to claim 1, wherein the inorganic binder is present in an amount of 20% by weight or less, based on 100% by weight of the particulate substrate. ### Claim 7 (depends on 1) The reflective particulate composition according to claim 1, wherein the pigment comprise a clay-based pigment composition comprising a kaolin clay in an amount of 50% by weight or greater based 100% by weight of the clay-based pigment composition. ### Claim 8 (depends on 7) The reflective particulate composition according to claim 7, wherein the clay-based pigment composition further comprises a secondary pigment component selected from the group consisting of transition metal oxides, alkaline earth metal sulfates, alkaline earth metal silicates, alkali metal silicates, and cristobalite. ### Claim 9 (depends on 1) The reflective particulate composition according to claim 1, wherein the pigment is present in an amount of 25% by weight or less based on 100% by weight of the particulate substrate. ### Claim 10 (depends on 1) The reflective particulate composition according to claim 1, wherein the hydrophobic exterior coating further comprises an antioxidant selected from the group consisting of alkylphenols, hydroxyphenylpropionates, hydroxybenzyl compounds, alkylidene bisphenols, secondary aromatic amines, thiobisphenols, aminophenols, thioethers, phosphites, phosphonites, sterically hindered amines, and combinations thereof. ### Claim 11 (depends on 1) The reflective particulate composition according to claim 1, wherein the coupling agent comprises a silane coupling agent. ### Claim 12 (depends on 1) The reflective particulate composition according to claim 1, wherein the wax comprises polyethylene wax, polypropylene wax, carnauba wax, paraffin wax, microcrystalline wax, scale wax, acrylic wax, or a combination thereof. ### Claim 13 (depends on 1) A method of making the reflective particulate composition according to claim 1, the method comprising: mixing the particulate substrate with the inorganic binder to form a binder particulate substrate; mixing the binder particulate substrate with the pigment to form a pigmented particulate; heat treating the pigmented particulate; and mixing the pigmented particulate with a hydrophobic coating composition to form the hydrophobic exterior coating on the pigmented particulate, the hydrophobic coating composition comprising the (meth)acrylic polymer, the wax, the antioxidant and the coupling agent. ### Claim 14 (depends on 13) The method according to claim 13, wherein the heat treating the pigmented particulate is performed at a temperature of 300° C. to 1100° C. ### Claim 15 (depends on 14) The method according to claim 14, wherein the heat treating the pigmented particulate is performed at a temperature of 300° C. to 1100° C. ### Claim 16 (depends on 1) A method of making the reflective particulate composition according to claim 1, the method comprising: mixing the particulate substrate with the pigment to form a pigment particulate substrate; mixing the pigment particulate substrate with the inorganic binder to form a pigmented particulate; heat treating the pigmented particulate; and mixing the pigmented particulate with a hydrophobic coating composition to form the hydrophobic exterior coating on the pigmented particulate, the hydrophobic coating composition comprising the (meth)acrylic polymer, the wax, the antioxidant and the coupling agent. ### Claim 17 (depends on 1) The reflective particulate composition of claim 1, wherein the antioxidant comprises sodium hypophosphite, potassium hypophosphite, calcium hypophosphite, or a combination thereof. ### Claim 18 A method of making a reflective particulate composition, the composition comprising a particulate substrate; an inorganic binder coated on the particulate substrate; a pigment coated on the particulate substrate; and a hydrophobic exterior coating on the particulate substrate, the hydrophobic exterior coating comprising a (meth)acrylic polymer, a wax, a coupling agent, the method comprising: mixing the pigment, the inorganic binder, a dispersant and water to form a pigment mixture; adding the particulate substrate to the pigment mixture to form a pigmented particulate; heat treating the pigmented particulate; and mixing the pigmented particulate with a hydrophobic coating composition to form the hydrophobic exterior coating on the pigmented particulate, the hydrophobic coating composition comprising the (meth)acrylic polymer, the wax, and the coupling agent, wherein the hydrophobic coating composition is form by mixing the (meth)acrylic polymer, the wax, and the coupling agent to form a mixture, and adding an acid to the mixture.