An ink let recording medium of this disclosure has a substrate and at least one or more ink receiving layers on the substrate, in which a first ink receiving layer which is the outermost surface layer contains anionic inorganic particles having an average particle diameter of 3.0 μm or more, a binder, a cationic polymer, and a polyvalent metal salt, the content of the polyvalent metal salt based on the anionic inorganic particles in the first ink receiving layer is 5 mass % or more and 40 mass % or less, the content ratio of the polyvalent metal salt to the cationic polymer in the first ink receiving layer (Content of polyvalent metal salt/Content of cationic polymer) is 1.0 or more and 8.0 or less, and the arithmetic average roughness Ra of the surface of the recording medium is 1.0 μm or more.
本公开的一种油墨记录介质具有基底和基底上的至少一个或多个油墨接收层,其中作为最外层的第一油墨接收层包含平均颗粒直径为3.0 μm 或以上的阴离子无机颗粒、粘结剂、阳离子聚合物和多价
金属盐,基于第一油墨接收层中阴离子无机颗粒的多价
金属盐的含量为 5 质量%或以上和 40 质量%或以下,第一油墨接收层中多价
金属盐与阳离子聚合物的含量比(多价
金属盐含量/阳离子聚合物含量)为 1.0 或更高,8.0 或更低,记录介质表面的算术平均粗糙度 Ra 为 1.0 μm 或更高。