The present disclosure describes a treated cellulosic material comprising: a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising: a polymer comprising an olefin-carboxylic acid copolymer; and a modifying agent comprising a hydrophobic amine.

The present invention is a liquid-repellent heat sealable film that is excellent in liquid repellency and heat-sealing property, and has durability. The film comprises: a resin layer applied and formed on at least one surface of a substrate; and a large number of oxide microparticles adhered to the surface of the resin layer, wherein, in the resin layer, a plurality of heat-sealable particulate resins is bonded to each other, while maintaining their particulate forms, and is also bonded to the substrate surface to form a projecting and recessed structure, and the oxide microparticles are adhered to the surface of the particulate resin in an exposed state, without being buried.

The present disclosure describes a treated cellulosic material comprising: a cellulosic material having a porous structure defining a plurality of pores, at least a portion of the pores containing a treating agent comprising: a polymer comprising an olefin-carboxylic acid copolymer; and a modifying agent comprising a hydrophobic amine.

A coating that contains acid-modified polypropylene and that contains 5 mass % or more of nonvolatile matter is applied to a traveling metal strip in a state in which the surface temperature of the metal strip is 60 C. or lower. Next, the coating applied to the metal strip is baked at 80-250 C., and a coating film having a film thickness of 0.3 m or greater is formed on the traveling metal strip. The proportion of acid-modified polypropylene to resin total mass in the coating film is 40 mass % or higher. The traveling metal strip is then wound after being cooled to a surface temperature of 80 C. or lower.