PROBLEM TO BE SOLVED: To provide a waterproof cellulose sheet composed of fine cellulose fibers which has properties peculiar to cellulose such as heat resistance, chemical resistance, high elastic modulus and high adsorption performance derived from high surface activity, and has high porosity and high durability to water.SOLUTION: A waterproof cellulose sheet comprises a nonwoven fabric composed of fine cellulose fibers having a number average fiber diameter of 500 nm or less and satisfies all the following requirements (1) to (4): (1) a weight ratio of the fine cellulose fibers of 1 wt.% or more and 99 wt.% or less, (2) a porosity of 50% or more, (3) a tensile strength corresponding to a basis weight of 10 g/m2 of 6 N/15 mm or more, and (4) a ratio of dry tensile strength to wet tensile strength of 50% or more.COPYRIGHT: (C)2012,JPO&INPIT【課題】セルロース特有の耐熱性、耐薬品性、高弾性率と表面活性の高さに由来した高吸着性能を有し、かつ高い空孔率と水に対する高い耐久性を有する微細セルロース繊維からなる耐水性セルロースシートの提供。【解決手段】数平均繊維径が500nm以下の微細セルロース繊維から構成される不織布からなる耐水性セルロースシートであって、下記(1)~(4)の要件:(1)微細セルロース繊維の重量比率:1重量%以上99重量%以下(2)空孔率:50%以上(3)目付10g/m2相当の引張強度:6N/15mm以上(4)引張強度の乾湿強度比:50%以上のすべてを満足する耐水性セルロースシート。【選択図】なし
