Support for image recording medium and image recording medium made from the support
View Patent ↗A support for an image recording medium includes base paper, a polymer coating layer formed on both top and wire side surfaces, and a coating layer containing a pigment and an adhesive agent which is formed under the polymer coating layer on one or both side surfaces. The support has a water absorbence less than 20 mg in terms of cross section water absorption quantity given by the following expression: Cross section water absorption quantity (mg)=A−B where A is the mass of a 10×1.5 cm support after wiping off attached water after five minute immersion in a water bath at 20° C. and B is the mass of the paper base support before immersion.
1. A paper base support for an image recording medium comprising:
base paper;
a polymer coating layer formed on each of a top surface and a wire side surface of said base paper; and
a coating layer containing a pigment, an adhesive agent, a water resisting agent and a water repellent additive which is formed under said polymer coating layer on at least one of said top surface and said wire side surface;
wherein said water resisting agent is selected from the group consisting of ethylene-vinyl acetate copolymers, vinylidene chloride copolymers, ammonium zirconium carbonate, melamine-formaldehyde resins, ketone-aldehyde resins, and aldehyde starches; and
wherein said paper base support has a water absorbance less than 20 mg in terms of water absorption quantity of cross section (mg) given by the following expression:
water absorption quantity of cross section (mg)= A−B
where A is the mass of a 10×1.5 cm paper base support after wiping off attached water after five minute immersion in a water bath at 20° C. and B is the mass of the paper base support before immersion.
2. The paper base support defined in claim 1 , wherein said paper base support has a degree of sizing in a range of from 5 to 35 g/m 2 in Cobb 120 value measured by the method meeting JIS P8140.
3. The paper base support as defined in claim 1 , wherein said paper base support contains a sizing agent whose content is greater than 0.1% by mass.
4. The paper base support as defined in claim 3 , wherein said sizing agent is one selected from a group consisting of alkylketene dimers, epoxidized fatty acid amide, alkenyl anhydrate succinic acids and higher fatty acid salts.
5. The paper base support as defined in claim 1 , wherein said coating layer comprises a cast coating layer.
6. The paper base support as defined in claim 1 , wherein said polymer coating layer contains a polyolefin resin.
7. An image recording medium comprising a paper base support as defined in claim 1 and an image recording layer formed on said paper base support.
8. The image recording medium as defined in claim 7 , wherein said image recording medium is one selected from a group of an electrophotographic image recording medium, a heat sensitive recording medium, a sublimation transfer recording medium, a thermal transfer recording medium, a silver halide photographic recording medium and an ink-jet recording medium.