Abstract: To provide a water-soluble film roll 3 having end faces 4 with masking materials 5 adhered thereto. By using the water-soluble film roll 3 and paying out a water-soluble film 1 while holding the masking materials 5 adhered to the end faces 4, it is possible to prevent moisture from adhering to the end faces 4 and to prevent the water-soluble film 1 from rupturing due to welding of the film 1 with itself. In this connection, the masking materials 5 are preferably a plastic film capable of being adhered to the end faces 4 with a pressure-sensitive adhesive.

Abstract: In a method for hydraulic transfer printing, comprising floating a transfer sheet comprising a polyvinyl alcohol polymer film and a print layer formed thereon on a surface of an aqueous solution while directing the print layer upward, and then pressing an article against the surface of the aqueous solution to transfer the print layer to the article, wherein the surface tension of the aqueous solution is adjust to 45 mN/m or less and the extension ratio of the transfer sheet is adjusted to 1.30 or less during the transfer. This makes it possible to transfer a high-definition print pattern to the surface of an article having irregularities or a curved surface.

Abstract: To provide a water-soluble film roll 3 having end faces 4 with masking materials 5 adhered thereto. By using the water-soluble film roll 3 and paying out a water-soluble film 1 while holding the masking materials 5 adhered to the end faces 4, it is possible to prevent moisture from adhering to the end faces 4 and to prevent the water-soluble film 1 from rupturing due to welding of the film 1 with itself. In this connection, the masking materials 5 are preferably a plastic film capable of being adhered to the end faces 4 with a pressure-sensitive adhesive.

Abstract: In a method for hydraulic transfer printing, comprising floating a transfer sheet comprising a polyvinyl alcohol polymer film and a print layer formed thereon on a surface of an aqueous solution while directing the print layer upward, and then pressing an article against the surface of the aqueous solution to transfer the print layer to the article, wherein the surface tension of the aqueous solution is adjust to 45 mN/m or less and the extension ratio of the transfer sheet is adjusted to 1.30 or less during the transfer. This makes it possible to transfer a high-definition print pattern to the surface of an article having irregularities or a curved surface.

Abstract: To provide a water-soluble film roll 3 having end faces 4 with masking materials 5 adhered thereto. By using the water-soluble film roll 3 and paying out a water-soluble film 1 while holding the masking materials 5 adhered to the end faces 4, it is possible to prevent moisture from adhering to the end faces 4 and to prevent the water-soluble film 1 from rupturing due to welding of the film 1 with itself. In this connection, the masking materials 5 are preferably a plastic film capable of being adhered to the end faces 4 with a pressure-sensitive adhesive.

Abstract: In a method for hydraulic transfer printing, comprising floating a transfer sheet comprising a polyvinyl alcohol polymer film and a print layer formed thereon on a surface of an aqueous solution while directing the print layer upward, and then pressing an article against the surface of the aqueous solution to transfer the print layer to the article, wherein the surface tension of the aqueous solution is adjust to 45 mN/m or less and the extension ratio of the transfer sheet is adjusted to 1.30 or less during the transfer. This makes it possible to transfer a high-definition print pattern to the surface of an article having irregularities or a curved surface.

Abstract: The present invention provides a water-soluble film which comprises a modified polyvinyl alcohol containing an N-vinylamide monomer unit in an amount of 1 to 10 mole percent, and a carboxyl group and a lactone group in a total amount of 0.020 to 4.0 mole percent in the molecule, and having a degree of polymerization of 300 to 3000, and a degree of hydrolysis of 75 to 99.5 mole percent. Further, the present invention provides a package obtained by packaging an acidic substance, a chlorine-containing compound, or the like using the water-soluble film.

Abstract: A water-soluble resin composition is provided which comprises (i) 100 parts by weight of a polyvinyl alcohol polymer having a 1,2-glycol linkage content of at least 1.8 mole percent and a degree of hydrolysis of at least 90 mole percent, (ii) 1 to 50 parts by weight of a plasticizer and (iii) 5 to 50 parts by weight of a monosaccharide and/or a polysaccharide, optionally together with (iv) 1 to 20 parts by weight of an inorganic filler. Also provided is a water-soluble resin composition which comprise (i′) 100 parts by weight of a polyvinyl alcohol polymer having a 1,2-glycol linkage content of at least 1.8 mole percent and a degree of hydrolysis of 92 to 99 mole percent, (ii′) 1 to 50 parts by weight of a plasticizer and (iv′) 1 to 20 parts by weight of an inorganic filler, optionally together with (iii′) 5 to 50 parts by weight of a monosaccharide and/or polysaccharide. Further provided are water-soluble films produced by using those water-soluble resin compositions.

Abstract: The present invention provides a water-soluble film which comprises a modified polyvinyl alcohol containing an N-vinylamide monomer unit in an amount of 1 to 10 mole percent, and a carboxyl group and a lactone group in a total amount of 0.020 to 4.0 mole percent in the molecule, and having a degree of polymerization of 300 to 3000, and a degree of hydrolysis of 75 to 99.5 mole percent. Further, the present invention provides a package obtained by packaging an acidic substance, a chlorine-containing compound, or the like using the water-soluble film.

Abstract: A water-soluble resin composition is provided which comprises (i) 100 parts by weight of a polyvinyl alcohol polymer having a 1,2-glycol linkage content of at least 1.8 mole percent and a degree of hydrolysis of at least 90 mole percent, (ii) 1 to 50 parts by weight of a plasticizer and (iii) 5 to 50 parts by weight of a monosaccharide and/or a polysaccharide, optionally together with (iv) 1 to 20 parts by weight of an inorganic filler. Also provided is a water-soluble resin composition which comprise (i′) 100 parts by weight of a polyvinyl alcohol polymer having a 1,2-glycol linkage content of at least 1.8 mole percent and a degree of hydrolysis of 92 to 99 mole percent, (ii′) 1 to 50 parts by weight of a plasticizer and (iv′) 1 to 20 parts by weight of an inorganic filler, optionally together with (iii′) 5 to 50 parts by weight of a monosaccharide and/or polysaccharide. Further provided are water-soluble films produced by using those water-soluble resin compositions.