Process for the preparation of microcapsules

Details Process for the preparation of microcapsules Process for the preparation of microcapsules

2002-10-17

2010-10-05

Seidleck, James (Department: 1796)

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

Liquid encapsulation utilizing an emulsion or dispersion to...

C264S004330, C264S004700, C428S402200, C503S214000, C503S215000

Reexamination Certificate

active

07807076

ABSTRACT:
An improved process for the preparation of microcapsules consisting essentially of a wall material and a core material in condensing a melamine-formaldehyde precondensate and/or methyl ethers thereof in an aqueous dispersion of a water-insoluble core material and in the presence of an acrylic acid/acrylamide copolymer at acidic pH and at a temperature in the range of from 20° to 100° C., and hardening thereafter the melamine-formaldehyde precondensate to form the walls of the microcapsules at an elevated temperature, wherein the core material is dispersed in the precondensate/copolymer solution without initial partial condensation of the precondensate and copolymer and wherein the hydrophobe point of the precondensate and/or its methyl esters is less than 90° C., as well as microcapsules, paper and pressure-sensitive recording material comprising such microcapsules.

REFERENCES:
patent: 3516846 (1970-06-01), Matson
patent: 4105823 (1978-08-01), Hasler et al.
patent: 4406816 (1983-09-01), Sliwka
patent: 4898696 (1990-02-01), Sliwka
patent: 2 073 132 (1981-10-01), None
patent: 2073132 (1981-10-01), None

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