Patent ID: 6811837
Filing Date: 2004-11-02
Classification: B41M

Abstract:
A porous resin film comprising:a thermoplastic resin in an amount of 30 to 90% by weight; and at least one of an inorganic or organic finely divided powder having an average particle diameter of from 3 to 20 &mgr;m in an amount of 10 to 70% by weight, wherein the finely divided powder is surface-treated with (A) a surface treating agent comprising a copolymer comprising copolymerized units of at least one of (a1) a diallylamine salt or an alkyl diallylamine salt and (a2) a nonionic hydrophilic vinyl monomer, and (B) an anionic surface treating agent, and the porous resin film has a liquid absorption capacity of not smaller than 0.5 ml/m2 as measured by Japan TAPPI No. 5 1-87.