| 摘要 |
A print enhancement coating which includes from 0 to 100 percent by weight of a polyvalent metal ion salt, from 0 to 100 percent by weight of a cationic polym er, and from 0 to 100 percent by weight of a viscosity modifier, all based on the total dry weight of the coating. The coating also may include a nonionic or cationic surfa ctant. When present, the ink viscosity modifier may be a poly(ethylene oxide) having a weight-average molecular weight of from about 10,000 to about 200,000 or a low t o medium viscosity poly(vinyl alcohol) having a degree of hydrolysis of less than about 90 percent. In certain embodiments, the print enhancement coating may include fr om about 4 to about 90 percent by weight of a polyvalent metal ion salt and from ab out 96 to about 10 percent by weight of a cationic polymer. The present invention also provides a printable material which includes a first layer having a first side a nd a second side, a second layer overlaying the first surface of the first layer; and a thir d layer overlaying the second layer. The second layer includes particles of a thermoplas tic polymer having largest dimensions of less than about 50 micrometers and from abo ut 10 to about 50 weight percent of a film-forming binder, based on the weight of the thermoplastic polymer. The third layer is the print enhancement coating described above.
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