Inkjet photo paper printing is a convenient and high quality method

Inkjet photo paper printing is a convenient and high quality method

Inkjet photo paper printing is well established as a convenient and high quality method for the rendition of digitally stored text and photographs into hard copy output, on Inkjet photo paper or on other specialty substrates such as overhead transparency film or resin coated inkjet paper. In order to print satisfactorily on substrates such as plastics that are impervious to inkjet printer inks, an ink receptive layer is commonly coated onto the substrate. Two distinct types of ink receptive layer may be used for this purpose. Porous receptive layers may be used that absorb the ink primarily by capillary action. Alternatively, polymer coatings (typically non-porous) may be used that swell to absorb the ink. Many aspects of the present disclosure relate primarily to improved ink receptive coatings of the swellable polymer type.

In another aspect, an Inkjet photo paper printable article is disclosed herein which comprises a substrate having an image receptive layer disposed thereon. The image receptive layer comprises a water-soluble alkyl cellulose polymer, a water dispersible cationic polyurethane polymer, and a material selected from the group consisting of alkoxysilanes and polydimethylaminoethyl methacrylate salts.

It has now been discovered that an Inkjet photo paper receptive coating having good water resistance (for both the coating as a whole and the ink absorbed into the coating) and good absorbency toward aqueous ink compositions of the type commonly used in Inkjet photo paper printers may be made by incorporating an alkoxy silane into a polyurethane (PU) alkyl cellulose (AC) binder. Surprisingly, the PU-AC binder is found to require significantly lower amounts of alkyl silane to render it water-insoluble than is the case for other commonly used binder systems. Consequently, the detrimental effect that alkoxy silanes can have on water absorption can be minimized, and ink receptive coatings can be made based on these materials which have both excellent water resistance and excellent ink absorption.

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