A water-disintegrable resin film, characterized in that it exhibits a tensile strength of 2 N/25 mm width or more after the surface thereof is pressed by a cotton gauze impregnated with water of 40°C with a pressure of 1.47 N/cm2 for 5 hours under a condition wherein the temperature is 40°C and the relative humidity is 90%, and exhibits a start time for the disintegration thereof by water, which means the time needed until it starts to lose its form, of 600 seconds or less, in a test nearly according to JIS P 4501 for the capability of being united. The water-disintegrable resin film has a predetermined mechanical strength under a wet and warm or hot condition and also exhibits excellent disintegradability for a large amount of water, and thus can be suitably used as a back sheet of a liner for sanitary goods, which requires the combination of good water resistance and good water-disintegradability.
一种可遇
水分解的
树脂薄膜,其特征在于,在温度为 40°C、相对湿度为 90%的条件下,用浸有 40°C
水的棉纱布以 1.在温度为 40°C 和相对湿度为 90% 的条件下,用浸渍了 40°C
水的棉纱布以 1.47 牛顿/平方厘米的压力将其表面按压 5 小时后,其拉伸强度大于或等于 2 牛顿/25 毫米宽,并且在根据 JIS P 4501 进行的近似结合能力测试中,其遇
水分解的起始时间(即直到开始失去形状所需的时间)为 600 秒或更短。这种
水分解性
树脂薄膜在
潮湿、温暖或炎热的条件下具有预定的机械强度,对大量的
水也表现出极佳的分解性,因此可以适当地用作卫生用品衬垫的背板,这种衬垫要求兼具良好的防
水性和良好的
水分解性。