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US 5,858,940 AGranted
Printing plate image deletion composition
OwnerJames L. Orcuttinventor
Life of this patent
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Abstract
A hardened image is removed from printing plates by a solution of formic acid and hydrofluoric acid. In one embodiment, the solution further includes a buffer solution to maintain the oleophilic properties of the substrate for printing.
Claims3
An image deletion composition for removing hardened images from printing plates, comprising:
- formic acid in the range of 20-30% by volume of an 88% aqueous solution of formic acid;
- and
- a balance comprising hydrofluoric acid and water.
An image deletion composition for removing hardened image portions on printing plates comprising:
- ______________________________________ Formic acid 30% by volume of 88% solution Hydrofluoric acid 30% by volume of 48% solution Isopropyl alcohol 10% by volume of 100% solution Buffer solution Balance ______________________________________
Dependencies are inferred from the claim text.