| 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) resin made of copolymer which contains 0.1 to 20mol% of branched alkylacrylamide represented by a formula I as a modified ingredient, 0.1 to 20mol% of at least one type of ethylene unsaturated carboxylic acid or its salt as a copolymer ingredient is synthesized. 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 as the color developing layer and the protective layer, plasticizer resistance, oil resistance and water resistance can be improved. In the formula I, R1 is hydrogen or methyl group, R2 to R4 are alkyl group or aryl group, R5 is hydrogen, alkyl group or aryl group and the total number of carbons of the R2 to R5 is 4 or more. |
