Lubar, Michael J.;

Universal ink jet drafting film

A universal medium for ink jet printing comprises an ink receptor layer formed from a hydrophilic polymer and having a thin top coating of a cationic polymer. The medium can be used with pigment and dye based inks having either aqueous or glycol based solvents systems.

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What is claimed is:

1. An ink receptive medium for an ink jet printer, said medium comprising:

a substrate;

an ink receptor layer supported on said substrate, said receptor layer comprising a hydrophilic polymer; and

a top coat layer disposed upon said ink receptor layer, said top coat comprising styrene maleic anhydride wherein a portion of the anhydride rings are opened.

2. A medium as in claim 1 wherein said hydrophilic polymer comprises an acrylic polymer having water soluble side chains graft polymerized thereonto.

3. A medium as in claim 2 wherein a portion of said water soluble side chains are cross linked so as to decrease the water solubility of said hydrophilic polymer.

4. A medium as in claim 1, wherein said ink receptor layer further includes a polyelectrolyte material therein.

5. A medium as in claim 4, wherein said polyelectrolyte comprises polyvinyl pyrrolidone.

6. A medium as in claim 1, wherein the ink receptor layer has a thickness in the range 0.1-1 mil.

7. A medium as in claim 1, wherein the top coat layer has a thickness which is less than one micron.