| 摘要 |
In the multi colored thermally sensitive recording medium, at least one kind of dye precursor is contained in complex fine particles which contain dye precursor and polymer of multi valence isocyanate compound, further contain 4,4'-diisocyanate-3,3'-dimethyl-1,1'biphenyl and/or polymethylene.polyphenyl.polyisocyanate.
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