Abstract: A ball point pen ink composition having viscosity of at least 500 cps at 25° C. comprising 5-25% of slow evaporating organic solvent, 20-55% fast evaporating solvent, 16 to 36% of resin, 0.1 to 2% of structural viscosity imparting agent, 0.05 to 1% of polyvinyl pyrrolidone, 0.1 to 25% of lubricant, 3-25% of colorant, and 0.01 to 3% of amines/polyamines and/or 0.1 to 20% diols or polyols as associative thickening agents/additives; amines and/or diols or polyols capable of forming temporary bridging between silica particles at the same time forming associative coupling between amines itself and diols or polyol itself to obtain the ink composition having ultra low viscosity of about at least 500 cps and yet preventing leakage. The ink composition prevents leakage, bobbling and other defects associated with the prior art and at the same time gives pleasure while writing. The pen comprising, the above ink, is manufactured by the process of the invention.

Abstract: A ball point pen ink composition having viscosity of at least 500 cps at 25° C. comprising 5-25% of slow evaporating organic solvent, 20-55% fast evaporating solvent, 16 to 36% of resin, 0.1 to 2% of structural viscosity imparting agent, 0.05 to 1% of polyvinyl pyrrolidone, 0.1 to 25% of lubricant, 3-25% of colourant, and 0.01 to 3% of amines/polyamines and/or 0.1 to 20% diols or polyols as associative thickening agents/additives; amines and/or diols or polyols capable of forming temporary bridging between silica particles at the same time forming associative coupling between amines itself and diols or polyol itself to obtain the ink composition having ultra low viscosity of about at least 500 cps and yet preventing leakage. The ink composition prevents leakage, bobbling and other defects associated with the prior art and at the same time gives pleasure while writing. The pen comprising, the above ink, is manufactured by the process of the invention.

Abstract: A pressurized ball point pen ink composition comprising 30-65% of organic solvent, 15-50% of resin, 0.1-3% of viscosity imparting agent, 0.01 to 1% of polyvinyl pyrrolidone, 2 to 20% of lubricant, 5-25% of colorant; and 0.1-5% of amines and/or 0.1 to 20% diols or polyols; amines and/or diols or polyols capable of forming temporary bridging between silica particles at the same time forming associative coupling between amines itself and diols or polyol itself to obtain the ink composition having viscosity of about 10K to 45K cps. The pressurized ball point pen ink composition further comprising higher alcohol as anti-leakage and plasticizing additive in the ink composition to reduce the viscosity of the ink composition from 13K to 15K cps to below 1 0000 cps. The ink composition prevents leakage, bobbling and other defects associated with the prior art at the same time gives pleasure while writing. The pen comprising, the above ink compositions, which are manufactured by the process of the invention.