Stock material or miscellaneous articles – Ink jet stock for printing – Hardened – cured – or cross-linked ink receptive layer
Reexamination Certificate
2008-07-15
2008-07-15
Schilling, Richard L. (Department: 1795)
Stock material or miscellaneous articles
Ink jet stock for printing
Hardened, cured, or cross-linked ink receptive layer
C428S032280, C428S032700, C427S316000, C427S533000, C430S271100
Reexamination Certificate
active
07399507
ABSTRACT:
A method of preparation of a Lithographic Printing Plate comprising the steps of, selecting a substrate for making of the printing plate from a natural or synthetic polymeric sheet element material having a tensile strength in the range of 400 to 3000 Kgm/cm2 and thickness ranging from 75 microns to 250 microns; shrinking the said substrate to have shrinkage in the range of 0.2 to 2.0% by exposing the substrate to heat of temperatures ranging from 140 to 180 degrees Celsius for 8 to 12 minutes; subbing the substrate to alter the surface energy of the substrate; forming a hydrophilic lithographic coating by reacting a hydrophilic binder with a cross linking agent, an accelerator, at least one pigment, at least one cationic surfactant and particulate silica having micron size ranging between 1 to 5 microns and a pore volume ranging between 0.2 ml/gm to 1.8 ml/gm wherein the ratio of the catalyst to accelerator to cross linking agent to binder to pigment to anionic surfactant to particulate silica is 1:2 to 1:2 to 2:1 to 20:25 to 60:80 parts and applying at least one ply of the hydrophilic lithographic coating on the subbed substrate.
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Bhatt Jivan Gulabrai
Iyer Thyagarajan Anantharaman
Bromberg & Sunstein LLP
Schilling Richard L.
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