Patent ID: 7816425
Filing Date: 2010-10-19
Classification: C09D

Abstract:
1. A non-aqueous UV-curable ink composition for ink jet printing consisting essentially of: about 4.5% of a colorant; a dispersant system providing about 0.1% a dispersant synergist and about 1 wt% of a low molecular weight hyperdispersant; about 45 wt% of dipropylene glycol diacrylate; about 22 wt% propoxylated(2) neopentyl glycol diacrylate; about 7 wt% of ethoxylated(6) trimethylol propane triacrylate; about 7 wt% of ethoxylated(3) trimethylol propane triacrylate; about 3 wt% dipentaerythritol hexaacrylate; about 9 wt% photoinitiator; and about 0.3 wt% tetra-acrylate-modified polydimethylsiloxane surfactant having fifteen dimethylsiloxane groups; said composition causing the loss of no more than 5% of the nozzles in an ink jet print head after 750 prints and providing a hole to area ratio of no more than 0.007.