Water based ink composition for writing instrument

Details Water based ink composition for writing instrument Water based ink composition for writing instrument

2007-04-10

2007-04-10

Lorengo, J. A. (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Marking

C106S031860, C106S031590, C106S031890, C401S209000

Reexamination Certificate

active

10786603

ABSTRACT:
Provided is a water-based ink composition for a writing instrument comprising at least a colorant and water, wherein a nonionic high molecular surfactant having an alkylene oxide chain as a hydrophilic group and having an average molecular weight of 3000 to 200,000 is added to the ink composition in a range of 0.1 to 30% by weight. The above nonionic high molecular surfactant has preferably an HLB of 8 or more or a cloud point of 50° C. or higher and includes N-polyoxyalkylene-polyalkylenepolyamine and a polyoxyethylene-polyoxypropylene block polymer.

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McCutcheon's, 1972, Allured Publishing Corp., pp. 134 and 180.

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