Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1982-02-23
1984-07-17
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524501, 524512, 524542, 524597, 524732, 106 25, 264 43, 264 47, 42721334, 42721336, 523210, 346215, C08K 507, C08J 310, C08J 316
Patent
active
044607229
ABSTRACT:
Disclosed herein a process for producing a microcapsule having an excellent solvent-resistance and a thermal stability, and an extremely minute amount of unreacted formaldehyde, comprising the steps of dispersing a substance to be encapsulated into an aqueous solution containing a water-soluble cationic urea resin, at least one prepolymer selected from the group consisting of a melamine-formaldehyde prepolymer, a urea-formaldehyde prepolymer and a melamine-urea-formaldehyde prepolymer and an anionic surfactant and then, adding an acid-catalyst into the thus obtained aqueous dispersion thereby forming a wall membrane which encapsulates the dispersed microparticle of the substance to be encapsulated by polycondensing the prepolymer and the cationic urea resin followed by cross-linking while causing complex coacervation, and adding a monosaccharide into the aqueous dispersion while adjusting the pH of the aqueous dispersion with the addition of a hydroxide of an alkaline earth metal thereby removing the unreacted residual formaldehyde remaining in the aqueous dispersion.
REFERENCES:
patent: 1799954 (1929-04-01), Cherry
patent: 3447945 (1969-06-01), Mishima et al.
patent: 3516846 (1970-06-01), Matson
patent: 4107105 (1978-08-01), Korf
Chem. Abst., vol. 92, No. 24, p. 51, No. 199477, (1980).
Igarashi Yuriko
Okada Yoshio
Kight III John
Kureha Kagaku Kogyo Kabushiki Kaisha
Nutter Nathan M.
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