Basecoated substrate for an inkjet recording sheet
AssigneeWestvaco Corporation
InventorsHung-Tai Chao, Michael L. Dematte
Life of this patent
Estimating the term…
Abstract
The inkjet recording sheet substrate of the present invention comprises a cellulosic sheet support, e.g., paper, having on at least one surface thereof a base coating comprising pigment and binder. The preferred pigment component is a 50/50 mixture of kaolin clay and calcined clay, and the preferred binder component is polyvinyl acetate. This combination of binder and pigment has been found to possess a high absorption capacity for the vehicle of an inkjet ink and good compatibility with ink receptive top coatings applied over the base coat.
Claims4
A basecoated substrate for an inkjet recording sheet comprising a size pressed paper rawstock having applied to at least one side thereof from about 6-10 lbs/ream (ream site 3300 ft2) of the dried residue of a base coating composition comprising a binder and pigment, wherein said pigment consists essentially of a mixture of from about 40-60% Kaolin clay and 60-40% calcined clay, each having an average particle size in the range of from about 0.5-0.6 micron.
The basecoated substrate of clam 1, wherein the base coating composition, after it has been applied and before it is dried, has a solids content of less than about 60% at a viscosity of from about 1500-2000 cPs Brookfield, No.2 spindle.
Dependencies are inferred from the claim text.