abstract |
In the multi colored thermally sensitive recording medium, atnleast one kind of dye precursor is contained in complex fine particles whichncontain dye precursor and polymer of multi valence isocyanate compound,nfurther contain 4,4'-diisocyanate-3,3'-dimethyl-1,1'biphenyl and/ornpolymethylene · polyphenyl · polyisocyanate. |