| 摘要 |
PURPOSE:To prevent a crack of a magnetic recording layer upon bending of a sheet by employing water latex of styrene-butadiene copolymer as aqueous bonding agent of the layer in the sheet having the recording layer and a heat- sensitive color developing layer provided on a support. CONSTITUTION:A heat-sensitive recording type magnetic sheet to be mainly used for a ticket, a coupon ticket, a commuter pass, etc., comprises a magnetic recording layer containing ferromagnetic powder, aqueous bonding agent as main ingredients and provided on one side of a support, and a heat-sensitive color developing layer containing colorless or light-colored basic dye, colorant and aqueous bonding agent as main ingredients and provided on the other side of the support. In this case, as the bonding agent of the recording layer, water latex of styrene-butadiene copolymer emulsified by reactive emulsifier is employed, and ammonium zirconium carbonate is added in the recording layer. Thus, blocking is eliminated between the recording layer and the developing layer during storage for a long period in a wound state. |
