The invention described herein relates to a method of preparing microcapsules comprising a capsule core, a polymeric capsule wall and also, disposed on the outer surface of the capsule wall, a polyelectrolyte having an average molecular weight in the range from 500 g/mol to 10 million g/mol, the pol
The invention described herein relates to a method of preparing microcapsules comprising a capsule core, a polymeric capsule wall and also, disposed on the outer surface of the capsule wall, a polyelectrolyte having an average molecular weight in the range from 500 g/mol to 10 million g/mol, the polymeric capsule wall being formed from specified monomers, where the microcapsules have an average particle size of 1.5-2.5 μm and 90% of the particles have a particle size ≦4 μm, by microencapsulating a capsule core with a polymeric capsule wall and then contacting the polymeric capsule wall with one or more polyelectrolytes in water or an aqueous medium.
대표청구항▼
1. Isolated microcapsules comprising a capsule core, a polymeric capsule wall and, disposed on the outer surface of the polymeric capsule wall, a polyelectrolyte having an average molecular weight in the range from 500 g/mol to 10 million g/mol, wherein (1) the polymeric capsule wall contains units
1. Isolated microcapsules comprising a capsule core, a polymeric capsule wall and, disposed on the outer surface of the polymeric capsule wall, a polyelectrolyte having an average molecular weight in the range from 500 g/mol to 10 million g/mol, wherein (1) the polymeric capsule wall contains units obtained by the polymerization of the following monomers: 10% to 100% by weight of at least one C1-C24-alkyl ester of acrylic and/or methacrylic acid,0% to 80% by weight of a water-insoluble or sparingly water-soluble bi- or polyfunctional monomer, and0% to 90% by weight of other monomers,all based on the total weight of the monomers,(2) the microcapsules contain from 0.1% to 10% by weight of the polyelectrolyte based on the total weight of the microcapsules,(3) the microcapsules have an average particle size of 1.5-2.5 μm, and(4) 90% of the microcapsules have a particle size ≦4μm. 2. The microcapsules of claim 1, which are obtained by a method comprising: (a) microencapsulating a capsule core with a polymeric capsule wall by the polymerization of the following monomers: (i) 10% to 100% by weight of one or more C1-C24-alkyl ester of acrylic and/or methacrylic acid,(ii) 0% to 80% by weight of a water-insoluble or sparingly water-soluble bi- or polyfunctional monomer, and(iii) 0% to 90% by weight of other monomers,all based on the total weight of the monomers, to produce microcapsules; followed by (b) adding to the microcapsules in an aqueous medium the polyelectrolyte. 3. The microcapsules of claim 1, which are obtained by a method comprising: (a) microencapsulating a capsule core with a polymeric capsule wall by the polymerization of the following monomers: (i) 10% to 100% by weight of one or more C1-C24-alkyl ester of acrylic and/or methacrylic acid,(ii) 0% to 80% by weight of a water-insoluble or sparingly water-soluble bi- or polyfunctional monomer, and (iii) 0% to 90% by weight of other monomers,all based on the total weight of the monomers, to produce microcapsules; followed by (b) adding to the microcapsules in an aqueous medium the polyelectrolyte, and then(c) drying the microcapsules. 4. The microcapsules of claim 1, wherein the polyelectrolyte comprises at least one cationic polyelectrolyte. 5. The microcapsules of claim 1, wherein the capsule core is a lipophilic substance having a solid/liquid phase transition in the temperature range from −20 to 120° C. 6. The microcapsules of claim 1, wherein the polyelectrolyte is polymeric and has ionizable or ionically dissociable groups. 7. The microcapsules of claim 1, wherein the polymeric polyelectrolyte is water soluble or swellable in ionic form. 8. The microcapsules of claim 1, which contain from 0.5% to 5% by weight of the polyelectrolyte based on the total weight of the microcapsules. 9. The microcapsules of claim 1, which have an average particle size of 1.7-2.4 μm. 10. The microcapsules of claim 1, wherein 90% of the microcapsules have a particle size ≦3.5 μm. 11. The microcapsules of claim 1, wherein 90% of the microcapsules have a particle size ≦3 μm. 12. The microcapsules of claim 1, wherein the full width at half maximum value of the microcapsule dispersion is 0.2 to 1.5. 13. The microcapsules of claim 1, wherein the full width at half maximum value of the microcapsule dispersion is 0.4 to 1.0. 14. The microcapsules of claim 1, wherein the weight ratio of the capsule core to the capsule wall is 50:50 to 95:5. 15. The microcapsules of claim 1, wherein the weight ratio of the capsule core to the capsule wall is 70:30 to 93:7. 16. A textile having incorporated therein the microcapsules of claim 1. 17. A bindered building material comprising the microcapsules of claim 1. 18. A heat transfer fluid comprising a dispersion of the microcapsules of claim 1. 19. A method of preparing microcapsules, wherein the microcapsules comprise a capsule core, a polymeric capsule wall and, disposed on the outer surface of the polymeric capsule wall, a polyelectrolyte having an average molecular weight in the range from 500 g/mol to 10 million g/mol, wherein(1) the polymeric capsule wall is formed from units obtained by the polymerization of the following monomers: 10% to 100% by weight of at least one C1-C24-alkyl ester of acrylic and/or methacrylic acid,0% to 80% by weight of a water-insoluble or sparingly water-soluble bi- or polyfunctional monomer, and0% to 90% by weight of other monomers,all based on the total weight of the monomers,(2) the microcapsules contain from 0.1% to 10% by weight of the polyelectrolyte based on the total weight of the microcapsules,(3) the microcapsules have an average particle size of 1.5-2.5 μm, and(4) 90% of the microcapsules have a particle size ≦4 μm, comprising:(a) microencapsulating a capsule core with a polymeric capsule wall formed from the polymerization of the following monomers: (i) 10% to 100% by weight of one or more C1-C24-alkyl ester of acrylic and/or methacrylic acid,(ii)0% to 80% by weight of a water-insoluble or sparingly water-soluble bi- or polyfunctional monomer, and(iii) 0% to 90% by weight of other monomers,all based on the total weight of the monomers, to produce microcapsules; followed by (b) adding to the microcapsules in an aqueous medium the polyelectrolyte, followed by isolating the microcapsules. 20. The method of claim 19, further comprising drying the microcapsules. 21. The method of claim 19, further comprising spray drying the microcapsules.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (10)
Jahns Ekkehard,DEX ; Reck Bernd,DEX, Application of microcapsules as latent heat accumulators.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.