| 摘要 |
The present invention features the production of a coated substrate such as paper, and more particularly relates to a novel substrate coating process and novel compositions useful in conjunction therewith. In one aspect the present invention features coating compositions and methods for improving the quality of images printed on a paper substrate. The novel coating compositions contain from 5-95 wt. percent of a film-forming binder mixed with a dye fixing compound, dye fixing polymer or a mixture thereof selected from the group consisting of: (i) a monomeric guanidine compound, a biguanidine compound, a guanidine oligomer, or a derivative, which is a member selected from the such group consisting of chlorhexidine, chlorguamide, an oligomer of a chlorhexidine or chlorguanidine derivative, and the like, or a salt thereof, (ii) a polyvinylamidine polymer or a salt thereof, (iii) a mixture of (i) and a polyvinylamidine polymer or salt thereof, (iv) a mixture (i) and a guanidine polymer, or a salt thereof, (v) a mixture of a guanidine polymer, or a salt thereof, and a polyvinylamidine polymer or a salt thereof, and (vi) a mixture of (ii), a guanidine polymer or a salt thereof, and a polyvinylamidine polymer or a salt thereof, wherein the ink-receptive surface coating composition or agent of (i)-(vi) may also include at least one organic or inorganic cross-linker, as well as other coating substituents. When applied to a sized paper substrate, the coating compositions provide a coated paper substrate that provides high quality printed images when printed with an ink containing a reactive dye having ionizable and/or nucleophilic groups capable of reacting with the coating agent. Images printed on a paper substrate coated with the coating composition of the invention are bleed-resistant, water-resistant (e.g., water-fast), and/or are characterized by an enhanced chroma and hue.
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