Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-01-25
1992-06-02
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
526287, C08J 300, C08F22802
Patent
active
051187566
ABSTRACT:
When obtaining microcapusles 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: 4373056 (1983-02-01), Besecke
patent: 4406816 (1983-09-01), Sliwka
Asano Makoto
Hasegawa Kiyoharu
Oono Yoshihiro
Tamura Yukio
Henderson Christopher
Mitsui Toatsu Chemicals Inc.
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