To provide a lead board attached with a gypsum board for use in lead treatment in a lead chamber or the like, which allows only a lead plate constituting the lead board to be easily removed from the used lead board for efficient collection, and a removable release sheet for application to the board.
A lead board 10 attached with a gypsum board comprises a gypsum board 11, a lead plate 13, and an intermediate layer 12 which joins the gypsum board 11 and the lead plate 13. The intermediate layer 12 comprises a removable release sheet 20 including a sticker or adhesive layer 21, a sheet-like base material layer 22, and a close contact layer 23, which are laminated in this order. The close contact layer 23 is formed of a close contact layer composition containing a natural rubber latex as a main component and 5 to 90 pts.mass of a synthetic resin emulsion relative to 100 pts.mass of the natural rubber latex. The synthetic resin emulsion has a glass transition temperature of -70 to -15°C. The close contact layer 23 has a thickness of 50 to 150 μm.
SUGIYAMA TAKASHI
KATO KAZUKI
