Oil-Based Ink Composition for PVC Printing

Printed images obtained from a water-based ink are generally poor in water resistance. In addition, water-based inks are difficult for printing images on a recording medium having a water-resistant surface (17). 

An oil-based ink is capable of providing printed images with good water resistance, and making it easy to print images on a recording medium or woodfree paper having a water-resistance surface. 

Conventional oil-based inks contain aromatic hydrocarbons such as toluene or xylene, aliphatic hydrocarbons such as hexane or kerosene, ketones such as methyl ethyl ketone, esters such as ethyl acetate, or solvents such as propylene glycol mono methyl ether acetate. The problems with such inks are that their fast drying time due to low boiling points or flash points are likely to clog up the nozzle. 

In addition, when images are printed on a poly(vinyl chloride) substrate, another problem arises concerning the image quality and printed image dry capability. 

An oil-based ink composition has been developed that uses poly-(alkylene glycol) cfialkyl ether as solvent and a carbon black pig- 

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