Ball pen inks which do not form clogging crystalline masses within copper or copper alloy ink cartridges

Claim 1

An improved ball pen ink which is substantially non-corrosive to copper or copper alloy in a ball pen cartridge in the presence of oxygen and moisture, which ink is free of copper or copper alloy particles, and which ink consists essentially of: a. liquid polar organic carrier, about 30-70 weight percent; b. carrier soluble fatty acid having 4-20 carbon atoms, about 1-25 weight percent; c. about 5-50 weight percent of carrier soluble resin selected from the class consisting of coal tar, coumarone, coumarone-indene, phenol-modified-coumarone, phenol-modified-coumarone-indene, hexanetriol phthalate resin, ketone condensate, ketone-aldehyde condensate, pine tar, polyvinylpyrrolidone, zein, and mixtures thereof; d. dye, pigment, or mixtures thereof, in an amount suitable for producing the desired colored line; and e. carrier soluble additive from the class of (1) antioxidants, (2) corrosion inhibitors, and (3) mixtures thereof, where said (1) antioxidants are selected from the group consisting of octylated diphenylamine, isopropoxy diphenylamine, condensate of acetone and diphenylamine, aldol-alpha-naphthylamine, phenyl-beta-naphthylamine, dicyclohexylamine, diaryl-paraphenylene diamine, alkylaryl-para-diphenylene diamine, 2,2-methylene-bis-(4-methyl-6-tertiary butyl phenol), 2,2-methylene-bis-(4-ethyl-6-tertiary butyl phenol, 2,6-ditertiary butyl-4-methyl phenol, styrenated phenol, hindered phenol, polymeric hindered phenol, lauryl-para-aminophenol, stearyl-para-aminophenol, N-acetyl-para-aminophenol, N-butyryl-para-phenol, 2,2-thiobis-(4-methyl-6-tertiary-butyl phenol). 1,1-thiobis-(2-naphthol), hydroquinone, 2,5-ditertiary butylhydroquinone, 2,5-ditertiary amylhydroguinone, monotertiarybutyl hydroquinone, hydroquinone monomethyl ether, hydroquinonemonobenzyl ether, octadecyl-3-(3',5'-ditertiary butyl-4')-hydroxy phenyl propionate, dilauryl propionate, ditertiary butylthiodipropionate, butylated hydroxyanisole, 4-dodecyloxy-2-hydroxybenzophenone, and polymerized tirmethyl dihydroquinoline, and said (2) corrosion inhibitors are selected from the group consisting of sorbitan fatty acid ester, trimer acid, nonyl phenoxy acetic acid, N,N'-disalicylol-1,2-propanediamine, bis(octylphenyl) hydrogen phosphate diethylamine, octylphenyldihydrogen phosphate diethylamine, mixtures of said diethylamine salts, mercaptobenzothiazole, sodium-2-mercaptobenzothiazole, 2-phenylbenzothiazole, zinc dibutyl dithiocarbamate and mixtures thereof. where said antioxidant, when present, is present in an amount of about 0.5-10 weight percent, where said corrosion inhibitor, when present, is present in an amount of about 0.1-5 weight percent, and said weight percents of antioxidant and corrosion inhibitor are based on the weight of the ink components: carrier, fatty acid, resin, dye and pigment.