Production process of microcapsules

Details Production process of microcapsules Production process of microcapsules

C - Chemistry, Metallurgy

08

L

402/321, 400/546

C08L 33/02 (2006.01) B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01) C08L 33/18 (2006.01)

Patent

CA 1237240

ABSTRACT When obtaining microcapsules by covering a hydrophobic material with an aminoaldehyde polycondensa- tion product as a wall-forming material in an acidic aqueous medium containing an anionic water-soluble polymer, a microcapsule slurry having a high solid content and low viscosity can be obtained by using as the anionic water-soluble polymer a multi-component copolymer consisting as essential monomer components thereof of at least three types of acrylic monomers selected respectvely from (A) acrylic acid and/or methacrylic acid, (B) acrylo- nitrile and/or methacrylonitrile and (C) an acrylarnidoalkyl- sulfonic acid and/or sulfoalkyl acrylate. Over a wide pH range, the microcapsule slurry obtained in accordance with this invention undergoes little viscosity changes and exhibits neither destruction of its dispersed state nor coagulating tendency. Resulting microcapsules have a sharp particle size distribution and are equipped with dense wall films. The microcapsules thus obtained exhibit superb characteristics when used for recording materials such as pressure-sensitive recording papers.

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