Application of microcapsules as latent heat accumulators

US6200681A · kind A · utility

Assignee

• BASF SE

Inventors

• Ekkehard Jahns · Weinheim, DE
• Bernd Reck · Arnstadt, DE

Key dates

• Filing date: May 11, 2000
• Grant date: Mar 13, 2001
• Expiry date: May 11, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2989
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Used as latent heat storage media of microcapsules I comprising as core materials one or more lipophilic substances whose solid/liquid phase transition is within the range from -20 to 120.degree. C. and as shell a polymer obtainable by free-radical polymerization of a monomer mixture comprising PA1 from 30 to 100% by weight, based on the overall weight of the monomers, of one or more C.sub.1 -C.sub.24 -alkyl esters of acrylic and/or methacrylic acid (monomer I), PA1 from 0 to 80% by weight, based on the overall weight of the monomers, of a bi- or polyfunctional monomer (monomers II) which is insoluble or of low solubility in water, and PA1 from 0 to 40% by weight, based on the overall weight of the monomers, of other monomers (monomers III), and also novel microcapsules Ia, spray-dried microcapsules Ia', processes for their preparation and shaped articles and coating compositions comprising these microcapsules.