Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Method of use – kit – or combined with marking instrument or...
Patent
1986-10-24
1989-04-25
Lovering, Richard D.
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Method of use, kit, or combined with marking instrument or...
264 47, 42840221, 428914, 503214, 503215, B01J 1302, B41M 516, B41M 522
Patent
active
048248231
ABSTRACT:
A process for microencapsulating hydrophobic oils with color reactants, dissolved therein, of color reaction systems by reacting a water-soluble non-ionic melamine/formaldehyde precondensate and a water-soluble polymer in an oil-in-water dispersion for forming the capsule envelope is described. The special feature of this process is that, for stabilizing the oil-in-water dispersion, an aqueous solution of a cationic melamine/formaldehyde precondensate and the aqueous solution of a water-soluble polymer are mixed with vigorous stirring, a solid precipitating as a very fine suspension in the mixture, the mixture thus obtained and containing the very finely suspended solid is mixed with ther oil, containing the color reactant in solution, with vigorous stirring, the oil-in-water dispersion thus obtained in acidified and an aqueous solution of a water-soluble non-ionic melamine/formaldehyde precondensate is added with stirring, in order to form the capsule envelope. The use of the cationic melamine/formaldehyde precondensate leads to the precipitation of a very finely suspended reaction product thereof, whereby all the reaction systems in the course of the process are stabilized. Excellent capsules can be obtained without formation of agglomerates. The invention also relates to the microcapsules obtainable by the above process and to their advantageous use in color reaction recording systems.
REFERENCES:
patent: 4369670 (1983-08-01), Sinclair
patent: 4525520 (1985-06-01), Shioi et al.
"Flow Measurement", Kirk-Other Concise Encyclopedia of Chemical Technology, 1985, p. 496.
Pietsch Gunter
Schrader Karl-Heinz
Lovering Richard D.
Papierfabrik August Koehler AG
LandOfFree
Microcapsules containing oils and soluble color reaction compone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microcapsules containing oils and soluble color reaction compone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microcapsules containing oils and soluble color reaction compone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1195835