The present invention relates to a coarsely divided microcapsule preparation with particles whose particle sizes are in the range from 200 μm to 5 cm, comprising microcapsules with a capsule core of latent heat storage material and a thermosetting polymer as capsule wall and one or more polymeric bi
The present invention relates to a coarsely divided microcapsule preparation with particles whose particle sizes are in the range from 200 μm to 5 cm, comprising microcapsules with a capsule core of latent heat storage material and a thermosetting polymer as capsule wall and one or more polymeric binders whose binder polymer has thermoplastic properties and film-forming properties under processing conditions, where the binder content, calculated as solid, is 1-30% by weight, based on the total weight of the coarsely divided microcapsule preparation.
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1. A coarsely divided microcapsule preparation with particles whose particle sizes are in the range from 200 μm to 5 cm, comprising microcapsules with a capsule core of latent heat storage material and a thermosetting polymer as capsule wall and one or more polymeric binders whose binder polymer has
1. A coarsely divided microcapsule preparation with particles whose particle sizes are in the range from 200 μm to 5 cm, comprising microcapsules with a capsule core of latent heat storage material and a thermosetting polymer as capsule wall and one or more polymeric binders whose binder polymer has a glass transition temperature of from −60 to +150° C., has thermoplastic properties and film-forming properties under processing conditions and is constructed from one or more ethylenically unsaturated monomers by emulsion polymerization, where the binder content, calculated as solid, is 1-30% by weight, based on the total weight of the coarsely divided microcapsule preparation wherein said binder polymer is at least one polymer selected from the group consisting of a copolymer of styrene with an alkyl(acrylate), a copolymer of styrene with butadiene, a polymer of an alkyl(meth)acrylate, a homopolymer of a vinyl ester of an aliphatic carboxylic acid, a copolymer of a vinyl ester of an aliphatic carboxylic acid with an olefin, a copolymer of a vinyl ester of an aliphatic carboxylic acid with an alkyl (meth)acrylate, a copolymer of a vinyl ester of an aliphatic carboxylic acid with an aliphatic carboxylic acid and an alkyl(meth)acrylate and a copolymer of styrene with acrylonitrilewherein the capsule wall comprises from 10 to 100% by weight one or more C1-C24-alkyl esters of acrylic acid/or methacrylic acid, 0 to 80% by weight of a bi- or polyfunctional monomer which is insoluble or sparingly soluble in water and 0 to 90% by weight of other monomers in each case based on the total weight of the monomers; andwherein said coarsely divided microcapsule preparation is an aggregation of said microcapsules. 2. The coarsely divided microcapsule preparation according to claim 1, wherein 90% by weight of the particles are greater that 500 μm. 3. The coarsely divided microcapsule preparation according to claim 1, wherein the binder content calculated as solid is 1-25% by weight based on the total weight of the coarsely divided microcapsule preparation. 4. The coarsely divided microcapsule preparation according to claim 1, wherein the latent heat storage material is a lipophilic substance with a solid/liquid phase transition in the temperature range from −20 to 120° C. 5. The coarsely divided microcapsule preparation according to claim 1, wherein the latent heat storage material is an aliphatic hydrocarbon compound. 6. The coarsely divided microcapsule preparation according to claim 1, wherein the capsule wall is a thermosetting polymer selected from the group consisting of highly crosslinked acrylic ester polymers, highly crosslinked methacrylic ester polymers and mixtures thereof. 7. The coarsely divided microcapsule preparation according to claim 1, wherein the capsule wall is constructed from 10 to 100% by weight of one or more C1-C24-alkyl esters of acrylic and/or methacrylic acid, 10 to 80% by weight of a bi- or polyfunctional monomer which is insoluble or sparingly soluble in water and 0 to 90% by weight of other monomers in each case based on the total weight of the monomers. 8. The coarsely divided microcapsule preparation according to claim 1, wherein the binder polymer is 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. 9. The coarsely divided microcapsule preparation according to claim 1, wherein the binder polymer is a copolymer of styrene with acrylonitrile. 10. A method of producing coarsely divided microcapsule preparations according to claim 1, comprising extruding the microcapsules, together with the polymeric binder dispersion and water, to a coarsely divided form and then, if appropriate, drying. 11. A method of producing coarsely divided microcapsule preparations according to claim 1, comprising extruding the microcapsules, together with the polymeric binder dispersion, at temperatures in the range 25 K below to 50 K above the glass transition temperature of the binder polymer and then, if appropriate, drying. 12. The method of producing coarsely divided microcapsule preparations according to claim 11, wherein the extruding is carried out at temperatures in the range from 60 to 110° C. 13. A heat exchanger comprising the coarsely divided microcapsule preparation as in claim 1. 14. Building materials comprising coarsely divided microcapsule preparation as in claim 1. 15. The coarsely divided microcapsule preparation according to claim 1, wherein said microcapsules have an average particle size of from 0.5 to 100 μm. 16. The coarsely divided microcapsule preparation according to claim 1, wherein said microcapsules have an average particle size of from 1 to 50 μm. 17. The coarsely divided microcapsule preparation according to claim 1, wherein a weight ratio of capsule core to capsule wall is from 50:50 to 95:5. 18. The coarsely divided microcapsule preparation according to claim 1, wherein a weight ratio of capsule core to capsule wall is from 70:30 to 93:7. 19. The coarsely divided microcapsule preparation according to claim 1, wherein said particle sizes range from 500 μm to 2 cm.
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