Finisher-preserver-cleaner composition for lithographic printing plates
AssigneeBayer Aktiengesellschaft
InventorMajor S. Dhillon
Life of this patent
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Abstract
A composition for finishing, preserving and cleaning lithographic printing plates which is composed of a polyol having a molecular weight in the range of from about 50 to about 3,000; a starch or dextrin hydrophilic film former; an alkyl benzene sulfonate amine salt; a composition of hydrocarbons containing less than about 10% aromatics and having a boiling point in the range of 175.degree. F. to 500.degree. F. and a flash point of above 100.degree. F.; a hydrogen, isooctyl, nonyl, decy or dodecyl substituted phenoxypoly(oxyethylene) ethanol surfactant having an HLB of 8 to 15; a C.sub.12 to C.sub.20 alcohol; mono-, di- or tri- ethanolamine; an organic or inorganic acid and water. The optional inclusion of a buffer salt and bacteriostat is preferred.
Claims20
A composition for finishing, preserving and cleaning lithographic printing plates consisting essentially of a stable emulsion of:
- (a) from about 0.1% to about 7.0% by weight of the composition of a polyol selected from the group consisting of ethylene glycol, propylene glycol, sorbitol and glycerin having a molecular weight in the range of from about 50 to about 3,000;
- (b) from about 1.0% to about 15.0% by weight of the composition of a hydrophilic film former selected from the group consisting of starches and dextrins;
- (c) from about 0.5% to about 2.0% by weight of the composition of an alkyl benzene sulfonate amine salt;
- (d) from about 1.0% to about 20.0% by weight of the composition of a composition of hydrocarbons having a boiling point in the range of from about 175.degree. F. to about 500.degree. F., and a flash point of above about 100.degree. F., said composition of hydrocarbons containing less than about 10% aromatic components;
- and
- (e) from about 0.1% to about 5.0% by weight of the composition of a substituted phenoxypoly(oxyethylene)ethanol wherein the substitution is H, isooctyl, nonyl, decy or dodecyl, having a hydrophile/lipophile balance of from about 8 to about 15;
- and
- (f) from about 0.1% to about 2.0% of a C.sub.12 to C.sub.20 alcohol;
- (g) from about 0.01% to about 1.0% by weight of the composition of a mono-, di- or tri- ethanolamine;
- and
- (h) a sufficient amount of an organic or inorganic acid to impart a pH to the composition of from about 2.5 to about 6.5;
- and
- (i) sufficient water to formulate an effective finishing, preserving and cleaning composition for lithographic printing plates.
Dependencies are inferred from the claim text.