Decorated leather manufacturing

A method for manufacturing a decorated natural leather comprising the steps of:

• jetting one or more radiation curable inkjet inks on a base coat present on a natural leather surface to form a decorative image;
• and
• curing the one or more radiation curable inkjet inks;
• wherein
• the one or more radiation curable inkjet inks comprise a colorant and a polymerizable composition comprising about 0.5 wt % to about 15.0 wt % of one or more polyfunctional polymerizable compounds and at least about 85.0 wt % of one or more monofunctional polymerizable compounds based on the total weight of the polymerizable composition;
• the one or more radiation curable inkjet inks comprise no organic solvent or up to about 35.0 wt % of organic solvent based on a weight of the radiation curable inkjet ink;
• and
• the glass transition temperature of the one or more radiation curable inkjet inks as calculated by Formula (I) is less than 25° C.,
• Ink
• ⁢
• Tg
• =
• ∑
• i
• =
• 1
• n
• ⁢
• wt
• ⁢
• %
• ⁢
• PC
• ⁡
• (
• i
• )
• ∑
• i
• =
• 1
• n
• ⁢
• wt
• ⁢
• %
• ⁢
• PC
• ⁡
• (
• i
• )
• 273.
• 1
• ⁢
• 5
• +
• T
• ⁢
• g
• ⁢
• P
• ⁢
• C
• ⁡
• (
• i
• )
• ⁢
• -
• 2
• 73.15
• Formula
• ⁢
• (
• 1
• )
• wherein
• i and n are integers;
• n is a total number of the monofunctional polymerizable and the polyfunctional polymerizable compounds in a radiation curable inkjet ink;
• TgPC(i) is a glass transition temperature in degree Celsius of a polymerizable compound PC(i);
• and
• wt % PC9(i) is a weight percentage of the polymerizable compound PC(i) based on the weight of the radiation curable inkjet ink.