JP2000241935A5 - - Google Patents

Claims (13)

A support for image material, wherein a paper mainly composed of natural pulp is used as a substrate and at least one surface thereof is coated with a resin layer containing a thermoplastic resin, wherein the resin layer is at least two layers of a lowermost layer and an uppermost layer Wherein the resin layer is coated by a sequential extrusion coating method, wherein at least a lowermost layer and at least an uppermost layer are sequentially melt-extruded and coated. body. In the resin layer composed of at least two layers, the resin layer composed of at least the uppermost layer is melt-extruded and coated at 170 ° C. to 290 ° C., and contains 15% by weight of titanium dioxide pigment in the resin layer. 2. The support for an image material according to claim 1, wherein said support is contained. The support for an image material according to claim 1 or 2, wherein at least the lowermost resin layer of the at least two resin layers is melt-extruded and coated at 290 to 340 ° C. body. The melt flow rate of the thermoplastic resin constituting each of the resin layers comprising at least the uppermost layer and the lowermost layer is at least 9 g / 10 minutes in the at least two resin layers. 4. The support for an image material according to 1, 2, or 3. When the resin layer consisting of at least the lowermost layer and the resin layer consisting of at least the uppermost layer are successively melt-extruded and coated by the sequential extrusion coating method, the preceding resin layer was cooled by the rapid cooling device. 5. The support according to claim 1, wherein a subsequent resin layer is subjected to melt extrusion coating. 6. The support according to claim 1, wherein the running speed of the paper substrate is at least 260 m / min. A method for producing a support for an image material in which a paper mainly composed of natural pulp is used as a substrate and at least one surface of which is covered with a resin layer containing a thermoplastic resin, wherein the resin layer is a lowermost layer and an uppermost layer A support for image material, comprising at least two layers, wherein the resin layer is coated by a sequential extrusion coating method in which at least a lowermost layer and at least an uppermost layer are sequentially melt-extruded and coated. Manufacturing method. In the resin layer composed of at least two layers, the resin layer composed of at least the uppermost layer is formed by melt extrusion coating at 170 ° C. to 290 ° C., and the resin layer contains at least 15% by weight of titanium dioxide pigment. The method for producing a support for an image material according to claim 7 , wherein the support is contained. In the resin layer of at least two layers of said at least a resin layer made of the bottom layer image material support according to claim 7 or 8, wherein the is obtained by melt extrusion coating at 290 ° C. to 340 ° C. Manufacturing method. In the above-mentioned resin layer composed of at least two layers, the thermoplastic resin resin constituting each of the resin layers composed of at least the uppermost layer and the lowermost layer has a melt flow rate of 9 g / 10 minutes or more. Item 10. The method for producing a support for an image material according to Item 7 , 8 , or 9 . The resin layer composed of at least the lowermost layer and the resin layer composed of at least the uppermost layer are sequentially melt-extruded and coated.When coating by the sequential extrusion coating method, the preceding resin layer is cooled by the rapid cooling device, and then cooled. the resin layer the method according to claim 7, 8, 9 or 10 images material support of, wherein the melt extrusion coating. The resin layer consisting of at least the lowermost layer and the resin layer consisting of at least the uppermost layer are sequentially melt-extruded and coated, and when coating by the sequential extrusion coating method, the preceding resin layer is subjected to corona discharge treatment by a corona discharge treatment device. after a subsequent resin layer, according to claim 7, 8, 9, 10 or 11 method of manufacturing an image material support according, characterized in that the melt extrusion coating. The process according to claim 7, 8, 9, 10, 11 or 12 images material support of, wherein the running speed of the paper substrate is 260 meters / minute or more.