# US 2008/0166555 A1 · Coarse-Particle Microcapsule Preparation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0166555 A1 - Document ID: US20080166555A1 - Status: Published application - Kind: A1 - Application number: 11/813,677 - Filed: 2006-01-14 - Published: 2008-07-10 - Earliest claimed: 2005-01-18 - Assignees: BASF SE - Inventors: Gabriele Lang-Wittkowski; Ekkehard Jahns; Markus Steffen - Web page: https://patentgrep.com/patent/US20080166555A1 ## CPC - F28D 20/023: {the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure} - B01J 2/20: by expressing the material, e.g. through sieves and fragmenting the extruded length - C04B 20/1033: {obtained by reactions only involving carbon-to-carbon unsaturated bonds} - C09K 5/063: {Materials absorbing or liberating heat during crystallisation; Heat storage materials} - C04B 2103/0065: {Polymers characterised by their glass transition temperature (Tg)} - C04B 2103/0066: {Film forming polymers} - Y02E 60/14: Thermal energy storage - Y10T 428/2982: Particulate matter [e.g., sphere, flake, etc.] - Y10T 428/2991: Coated - Y10T 428/2993: Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.] - Y10T 428/2995: Silane, siloxane or silicone coating - Y10T 428/2996: Glass particles or spheres - Y10T 428/2998: including synthetic resin or polymer - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to a coarse-particled microcapsule preparation comprising microencapsulated latent heat accumulators and one or more polymeric binders, the ratio of surface area to volume of the particles obeying the following relationship: Surface   area 2 Volume 3 ≥ 2.5 , and to processes for its production and its use in heat exchangers and building materials. ## Claims ### Claim at position 1 1-20. (canceled) ### Claim at position 2 21: A coarse-particled microcapsule preparation comprising one or more microencapsulated latent heat accumulator materials and one or more polymeric binders, the ratio of surface area to volume of the particles obeying the following relationship: Surface   area 2 Volume 3 ≥ 2.5 . ### Claim at position 3 (depends on 1, 90) 22: The coarse-particled microcapsule preparation according to claim 1, 90% by weight of the particles being greater than 500 μm. ### Claim at position 4 (depends on 21) 23: The coarse-particled microcapsule reparation according to claim 21, the binder content, calculated as solid, being 1-40% by weight, based on the total weight of the coarse-particled microcapsule preparation. ### Claim at position 5 (depends on 21) 24: The coarse-particled microcapsule preparation according to claim 21, the latent heat accumulator material being a lipophilic substance having a solid/liquid phase transition in the temperature range from −20 to 120° C. ### Claim at position 6 (depends on 21) 25: The coarse-particled microcapsule preparation according to claim 21, the latent heat accumulator material being an aliphatic hydrocarbon compound. ### Claim at position 7 (depends on 21) 26: The coarse-particled microcapsule preparation according to claim 21, the capsule wall being a thermosetting polymer. ### Claim at position 8 (depends on 21) 27: The coarse-particled microcapsule preparation according to claim 21, the capsule wall being composed of from 10 to 100% by weight of one or more C1-C24-alkyl esters of acrylic and/or methacrylic acid (monomers I) from 0 to 80% by weight of a bifunctional or polyfunctional monomer (monomers II) which is insoluble or sparingly soluble in water and from 0 to 90% by weight of other monomers (monomers III), based in each case on the total weight of the monomers. ### Claim at position 9 (depends on 21) 28: The coarse-particled microcapsule preparation according to claim 21, the binder polymer having film-forming properties under processing conditions. ### Claim at position 10 (depends on 21) 29: The coarse-particled microcapsule preparation according to claim 21, the binder polymer having a glass transition temperature of from −60 to 150° C. ### Claim at position 11 (depends on 21) 30: The coarse-particled microcapsule preparation according to claim 21, the binder or being synthesized from one or more ethylenically unsaturated monomers M by emulsion polymerization. ### Claim at position 12 (depends on 21) 31: The coarse-particled microcapsule preparation according to claim 21, the binder polymer being a homopolymer of vinyl esters of aliphatic carboxylic acids or a copolymer of vinyl esters of aliphatic carboxylic acids with olefins and/or alkyl (meth)acrylates. ### Claim at position 13 (depends on 21) 32: The coarse-particled microcapsule preparation according to claim 21, the binder polymer being a copolymer of styrene with acrylonitrile. ### Claim at position 14 (depends on 21) 33: The coarse-particled microcapsule preparation according to claim 21, the coarse-particled preparation comprising 2-20% by weight, based on the total weight of the preparation, of graphite. ### Claim at position 15 (depends on 33) 34: The coarse-particled microcapsule preparation according to claim 33, the graphite being expanded graphite. ### Claim at position 16 (depends on 21) 35: A process for the production of coarse-particled microcapsule preparations according to claim 21, wherein the microcapsules are brought, together with the polymeric binder and water, into a coarse-particled form and, if appropriate, then dried. ### Claim at position 17 (depends on 35) 36: The process for the production of coarse-particled microcapsule preparations according to claim 35, wherein the microcapsules are extruded together with the polymeric binder dispersion at temperatures in the range from 25 K below to 50 K above the glass transition temperature of the binder polymer and if appropriate then dried. ### Claim at position 18 (depends on 36) 37: The process for the production of coarse-particled microcapsule preparations according to claim 36, wherein extrusion is effected at temperatures in the range from 60 to 110° C. ### Claim at position 19 (depends on 35) 38: The process for the production of coarse-particled microcapsule preparations according to claim 35, wherein extrusion is effected through a cross or star die. ### Claim 39 (depends on 21) The use of the coarse-particled microcapsule preparation according to claim 21 in heat exchangers. ### Claim at position 21 (depends on 21) 40: The use of the coarse-particled microcapsule preparation according to claim 21 in building materials.