| abstract |
Disclosed is an insulated paper which is dense and satisfactorily satisfies the denseness that can prevent an internal short circuit by zinc oxide dendrite or the like due to anhydrous silver and the liquid repellency that can improve the middle discharge performance, For that purpose. In order to achieve the above object, in the present invention, the separator is formed by laminating a dense layer having denseness and a lubrication layer having liquefying property, and the dense layer is formed by mixing the alkaline cellulose fibers and the synthetic fibers, Wherein the degree of deterioration of the defatable alkali-resistant cellulose fibers is in the range of 500 ml to 0 ml in terms of CSF value, and the liquor layer comprises a mixture of alkali-resistant cellulose fibers and synthetic fibers, By weight based on the total weight of the alkali-soluble cellulose fibers, and the degree of severity of the alkali-resistant cellulose fibers is 700 ml or more in CSF value. |