It is often the case that there is a trade-off between efficient curing and flexibility of ink layers. Techniques to improve flexibility such as the use of monofunctional monomers can lead to poorly cured films. Poorly cured ink layers can transfer to the reverse side of the printed material when the printed layers are stacked or wound into reels. One method to overcome this problem is to use a compound having a persulphide bond, a radical polymerisable compound and an initiator. The cured ink layer prevents the leakage of uncured low molecular weight materials which may cause misting (such as in airtight containers or automotive instrument panels).
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