Stock material or miscellaneous articles – Ink jet stock for printing – Physical property of ink receptive layer specified
Reexamination Certificate
2005-05-17
2005-05-17
Shewareged, B. (Department: 1774)
Stock material or miscellaneous articles
Ink jet stock for printing
Physical property of ink receptive layer specified
C428S032340, C428S032360
Reexamination Certificate
active
06893691
ABSTRACT:
A coating composition comprising a relatively low alkali-containing colloidal silica and glossy ink jet recording sheets prepared from such coatings is described. The coating comprises binder and colloidal silica, e.g., having an average particle size in the range of about 1 to about 300 nanometers. The low alkali colloidal silica of this invention comprises ammonia, polydispersed colloidal silica, or both. Polydispersed silicas having a particle size distribution such that the median particle size is in the range of 15 to 100 nanometers and 80% of the particles span a range of at least about 30 to about 70 nanometers are preferred. It has been discovered that coatings prepared from such colloidal silica and applied to conventional ink jet recording sheet supports have a specular gloss of at least 30 at 60° C., and excellent printability at silica solids to binder solids ratio of 1:1 or greater.
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Fruge Daniel Ray
Michos Demetrius
Bunch William D.
Shewareged B.
W. R. Grace & Co.,-Conn.
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