| 摘要 |
In the encapsulation of solns. of co-reactants (I) of colour reaction system by normal microencapsulation processes, (I) are first dissolved in a good solvent (II) and the fresh soln. obtd. is mixed with a nonsolvent (III), which alone hardly dissolves (I), in an amt. giving a supersaturated system, just before encapsulation. Pref. (I) are the basic colour forming reactants (IA) or acid co-reactants (IB) of the system. (IA) pref. are lactone, fluoran, phthalide, di- or tri-phenylmethane and/or spiropyran derivs., opt. mixed with N-benzoyl-leuco-methylene blue and/or N-alkyl-carbazolyl-diphenylmethane derivs. (IB) pref. are acid phenolic cpds. (II) is an aromatic solvent and/or chlorinated paraffin, pref. alkylated biphenyl, alkylated naphthalene, alkylated terphenyl and/or diarylalkane cpd. (III) is a non-aromatic solvent, pref. aliphatic and/or cycloaliphatic solvents. |
