| 摘要 |
PURPOSE: To obtain excellent printability and to improve the plasticizer resistance, oil resistance, solvent resistance and water resistance by using specific modified PVA resin for a thermosensitive color developing layer, a protective layer and an undercoating layer. CONSTITUTION: Polyvinyl alcohol (PVA) polymer which contains 0.1 to 20mol% of ethylene unsaturated dicarboxylic acid monoamide or its salt as copolymer ingredient contains PVA resin represented by a formula I in the amide ingredient of ethylene unsaturated dicarboxylic acid monoamide or its salt. When the PVA resin is used as processing agent of a thermosensitive color developing layer, a protective layer and an undercoating layer of a thermosensitive recording sheet, the printability is excellent. Further, when it is used for the color developing layer and the protective layer, plasticizer resistance and oil resistance can be improved. A formula II indicates R0 of the formula I, and in the formulae I and II, n is 1 to 3, R1 to R3 are hydrogen, alkyl group or aryl group, two or more are simultaneously not hydrogen in the R2 to R3 , and the total number of carbons of the R1 to R3 is 4 or more. |
