Patent ID: 7927452

Claim:
A process for producing a layered sheet, comprising: preparing a cell dispersed urethane composition by a mechanical foaming method; applying the cell dispersed urethane composition onto a base material sheet having a thickness of 0.05 to 0.2 mm and a nitrogen gas permeation rate of 1×10 −7 cm 3 /cm 2 ·s·cmHg or less; laminating a release sheet having a thickness of 0.05 to 0.2 mm and a nitrogen gas permeation rate of 1×10 −7 cm 3 /cm 2 ·s·cmHg or less on the applied cell dispersed urethane composition; and forming a polyurethane foamed layer having interconnected cells by curing the cell dispersed urethane composition while making the thickness thereof uniform by applying pressure, wherein nitrogen gas, oxygen gas, carbon dioxide, a rare gas, air, or a mixed gas thereof is held within the layered sheet.