Microcapsules comprising bio-based phase change materials

Abstract

A composition contains microcapsules showing good thermal stability and comprising a core and a shell, where the core comprises (A) a phase change material component which comprises: (A1) a fatty acid ester, (A2) from 1 to 6 weight percent of a fatty acid having 10 to 18 carbon atoms, based on the weight of the fatty acid ester, and (A3) 0 to 10 weight percent of a fatty alcohol, based on the weight of the fatty acid ester; and where the shell comprises a reaction product of an isocyanate component and an amine compound, where the isocyanate component comprises, based on the weight of the phase change material component, (B1) 1 to 20 weight percent of an aliphatic isocyanate having at least two isocyanate groups, and (B2) 1 to 20 weight percent of an aromatic isocyanate having at least two isocyanate groups; where the weight ratio of the aliphatic isocyanate to the aromatic isocyanate is in a range of from 8.5:1.5 to 1.5:8.5; and where the amine compound comprises at least two amino functional groups selected from a primary amino group, a secondary amino group, or combinations thereof; and wherein the amine compound is present in an amount to provide a molar ratio of total primary and secondary amino groups to isocyanate groups in a range of 0.3:1 to 1.5:1. A method of preparing the composition is also disclosed.

Dependencies are inferred from the claim text.