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AssigneeThe Pilot Ink Co., Ltd.
InventorsTsutomu Kito, Kuniyuki Senga
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A shear-thinning water-based ball-point pen ink composition comprising from 1% by weight to 35% by weight of a colorant, from 2% by weight to 35% by weight of a water-soluble polar solvent, from 1% by weight to 30% by weight of a nonionic surface active agent having an HLB value within the range of from 8 to 12, and the balance being water and adjusting additives, and having a viscosity within the range of from 25 mPa.s to 160 mPa.s (a value at the number of revolution of 100 rpm in an EM type rotational viscometer, 25.degree. C.) and a shear thinning index within the range of from 0.1 to 0.6; the nonionic surface active agent having a mixed phase comprising a phase standing dispersed in the form of fine particles and a phase standing dissolved in a molecular state.
A method for preparing a shear-thinning water-based ball-point pen ink which comprises colorant and an aqueous vehicle comprising water and water-soluble polar solvent, comprising:
A shear-thinning water-based ball-point pen ink composition comprising from 1% by weight to 35% by weight of a colorant, from 2% by weight to 35% by weight of a water-soluble polar solvent, from 1% by weight to 30% by weight of a nonionic surface active agent having an HLB value within the range of from 8 to 12, water and adjusting additives, said composition having a viscosity within the range of from 25 mPa.s to 160 mPa.s at 100 rpm in an EM type rotational viscometer, 25.degree. C. and a shear thinning index within the range of from 0.1 to 0.6;
A shear-thinning water-based ball-point pen ink composition comprising from 5% by weight to 35% by weight of a reversible thermochromic microcapsular pigment material in which capsules with particle size ranging from 0.5 to 20 .mu.m in diameter are 95% or more by volume, from 1% by weight to 30% by weight of a nonionic surface active agent having an HLB value within the range of from 8 to 12, from 2% by weight to 35% by weight of a water-soluble polar solvent, water and adjusting additives, and having a viscosity within the range of from 30 mPa.s to 160 mPa.s at 100 rpm in an EM type rotational viscometer at 25.degree. C. and a shear thinning index within the range of from 0.1 to 0.6.
Dependencies are inferred from the claim text.