Process for producing microcapsules and microcapsule slurry

Details Process for producing microcapsules and microcapsule slurry Process for producing microcapsules and microcapsule slurry

1984-07-24

1986-03-04

Lovering, Richard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

264 43, 264 47, 346215, 428914, 526288, B01J 1302, B32B 2742

Patent

active

045741107

ABSTRACT:
When obtaining microcapsules by covering a hydrophobic material with an aminoaldehyde polycondensation 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 respectively from (A) acrylic acid and/or methacrylic acid, (B) acrylonitrile and/or methacrylonitrile and (C) an acrylamidoalkylsulfonic 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.

REFERENCES:
patent: 4221710 (1980-09-01), Hoshi et al.
patent: 4406816 (1983-09-01), Sliwka

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