B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
42/15, 117/45.3
B01J 13/02 (2006.01) B01J 13/18 (2006.01) B41M 5/165 (2006.01) C08K 9/10 (2006.01)
Patent
CA 1149239
O.Z. 0050/034077 Abstract of the Disclosure: In a process for the pre- paration of microcapsules based on a melamine-formaldehyde resin, in which the microcapsules are obtained by con- densing a melamine-formaldehyde precondensate, its C1-C4-alkyl ethers, or mixtures thereof, in water in which the material forming the capsule core is dispersed, at a pH of from 3 to 6.5 and at from 20 to 100°C, the improvement that the water contains a homopolymer or copolymer which possesses sulfonic acid groups but is devoid of phenyl or sulfophenyl groups and has a K value of from 100 to 170 or a viscosity of from 200 to 5,000 mPa.s (shearing gradient 489 s-1; 20% strength solution at 25°C), and that the melamine-formaldehyde preconden- sate is added continuously, or in portions, in step with the rate of condensation. The process gives individual capsules which are highly impermeable. The capsules are exceptionally useful for the production of pressure-sensitive record- ing materials.
361716
Basf Aktiengesellschaft
Robic Robic & Associes/associates
LandOfFree
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