Microcapsules with a paraffin composition as capsule core

摘要

Microcapsules of the present invention have a core and a wall. The wall is made of a polymer, which by weight is from 40 to 90% C1-C24-alkyl ester of acrylic acid, methacrylic acid, or both (“first monomer”); from 10 to 60% an ethylenically unsaturated crosslinker; and from 0 to 30% an ethylenically monounsaturated monomer different from the first monomer. At least 80% of the crosslinker is has three or more ethylenically unsaturated radicals. The core is made of a paraffin composition, which by weight has from 35 to 98% n-octadecane; from 1 to 10% C20-C24-aliphatic, diisopropylnaphthalene, or both; from 1 to 5% wax with a melting point >40° C.; and from 0 to 50% n-hexadecane. The present invention also relates to a process for preparing the microcapsules and to their use in binding construction materials, textiles, and heat transfer liquids.

主权项

1. A microcapsule comprising a paraffin composition as capsule core and a polymer as capsule wall, which is formed from
40 to 90% by weight of one or more C1-C24-alkyl esters of acrylic acid and/or methacrylic acid (monomers I), 10 to 60% by weight of one or more ethylenically unsaturated crosslinkers (monomers II), where at least 80% by weight, based on the ethylenically unsaturated crosslinker, is a crosslinker with three or more ethylenically unsaturated radicals, and 0 to 30% by weight of one or more ethylenically monounsaturated monomers (monomer III) which are different from the monomers I, in each case based on the total weight of the monomers, wherein the paraffin composition comprises 35 to 98% by weight of n-octadecane, 1 to 10% by weight of at least one of eicosane and diisopropylnaphthalene 1 to 5% by weight of at least one wax with a melting point >40° C. and more than 0 and up to 50% by weight of n-hexadecane, in each case based on the paraffin composition, and wherein the ethylenically unsaturated crosslinker with three or more ethylenically unsaturated radicals is selected from the group consisting of trimethylolpropane triacrylate and methacrylate, pentaerythritol triallyl ether, pentaerythritol tetraallyl ether, pentaerythritol triacrylate and pentaerythritol tetraacrylate, and their technical-grade mixtures.