Patent ID: 7758684

Claim:
An ink additive comprising (A) 10 to 90% by weight of at least one acetylene glycol selected from the group consisting of an acetylene glycol having the general formula (1): wherein R 1 and R 2 each are C 1 -C 5 alkyl, and (B) 10 to 90% by weight of at least one sulfur-containing surfactant selected from compounds having the general formulae (4): wherein M is independently an alkali metal, alkaline earth metal or ammonium group, and R 6 is independently hydrogen or a C 1 -C 20 alkyl group, wherein a 0.1 wt % aqueous solution of said ink additive has a contact angle of equal to or less than 60 degrees after 30 seconds from dropping and a dynamic surface tension of equal to or less than 50 mN/m both at 1 Hz and 10 Hz.