To make it possible to obtain high strength and smooth surface by consisting a water absorptive material to be laminated between a water permeable material and a water impermeable material of denatured matter of polyalkylene oxide.
This concrete curing sheet is formed by laminating the denatured matter of the polyalkylene oxide obtained by reaction of polyalkylene oxide and polyol with an isocyanate compound between the water permeable material and the water impermeable material. The melting viscosity under loading of 4.9 MPa at 170°C of the denatured matter of the polyalkylene oxide is preferably 50 to 5000 Pa.S and the water absorptivity (g pure water/g resin) thereof is 5 to 46 g/g. The polyalkylene oxide has preferably a weight average molecular weight of 500 to 500,000 and includes, for example, polyethylene oxide, or the like. The polyol is preferably ethylene glycol, or the like, and the isocyanate compound is preferably 1,6-hexamethyhlene diisocyanate, or the like.
TAKEMORI SHINICHI
HASHIMOTO NAOYUKI
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