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US 4,734,132 AGranted
Lipophobicating solution for electrophotographic plates for offset printing contains phytic acid and at least two dicarboxylic acids
AssigneeNikken Chemical Laboratory Co., Ltd.
InventorHajime Yoshida
Life of this patent
Estimating the term…
Abstract
There is provided a lipophobicating solution for electrophotographic plates for offset printing which comprises (a) phytic acid, (b) two or more dicarboxylic acids selected from those represented by the formula HOOC--(CH.sub.2).sub.n --COOH (where n is 1 to 6) and phthalic acid, (c) water, and (d) a pH adjustor. This lipophobicating solution does not cause scumming and its effect lasts for a long period of time.
Claims18
A lipophobicating solution for an electrophotographic plate for offset printing, comprising:
- (a) an effective amount of phytic acid to prevent oily ink from sticking to nonimage areas of said electrographic plate;
- (c) at least about 60 mol % by weight, compared to said phytic acid, of a mixture of two or more dicarboxylic acids selected from those represented by the formula HOOC--(CH.sub.2).sub.n --COOH (where n is 1 to 6) and phthalic acid;
- (c) water;
- and
- (d) a basic salt as a pH adjustor.
2 more elements
A lipophobicating solution for an electrophotographic plate for offset printing, consisting essentially of:
- (a) an effective amount of phytic acid to prevent oily ink from sticking to nonimage areas of said electrographic plate;
- (b) at least about 60 mol % by weight, compared to said phytic acid, of a mixture of two or more dicarboxylic acids selected from those represented by the formula HOOC--(CH.sub.2).sub.n --COOH (where n is 1 to 6) and phthalic acid;
- (c) water;
- and
- (d) a basic salt as a pH adjuster.
2 more elements
Dependencies are inferred from the claim text.