Water-dilutable resins ABCD, obtainable by converting aldehyde or ketone resins A, multi-functional isocyanates B, aliphatic acids C, each with at least one acid group and one group that can react with isocyanates to form a urethane or urea structure, and also an aliphatic polyether D, with at least one hydroxyl group per molecule, whereby at least one of the educts C and D is used and if necessary, neutralization with aqueous ammonia or amines, provided a compound according to C is used.

A meltable ink which is solid at room temperature, which ink is suitable for use in an indirect printing process, in which printing process the ink is transferred, by the use of an inkjet printhead, to a transfer element, whereafter the ink is transferred to a receiving material under pressure from the transfer element, the ink having a composition such that it is pressure-transferable at a temperature between a bottom temperature limit and a top temperature limit, wherein the ink has a deformation energy of less than 20.times.10.sup.5 Pa.s at a temperature equal to said top temperature limit.

An ink composition for a meltable ink usable in a printing apparatus in which ink droplets are ejected from ink ducts, the ink composition containing an amorphously solidifying monomer compound, which compound shows a crystallinity of less than 1% when a melt of the compound is cooled at a rate of 5.degree. C./min to past its solidification path and is then heated at a rate of 20.degree. C./min to above its melting temperature. The monomer compound can be used in a binder for the ink composition. When inks of this kind are transferred to a receiving material, it results in greater stability in the printed layers, with respect to gum, scratch, fold resistance and transparency.

A meltable ink composition, which is solid at room temperature and liquid at elevated temperature, which ink composition is suitable for use in an inkjet printer, the ink composition being provided with a resin which contains a compound which is the reaction product of a di-alkanolamine and a monofunctional aromatic acid and optionally a difunctional acid.

Disclosed is a printing process which comprises (1) incorporating into an acoustic ink jet printing apparatus an ink composition comprising (a) an ink vehicle which comprises a bis(carbamate) of the formula ##STR1## wherein R.sub.1 is an alkylene group and R.sub.2 and R.sub.3 each, independently of the other, are alkyl groups or alkylene oxide or polyalkylene oxide groups of the formula --(C.sub.n H.sub.2n O).sub.y H, wherein n is an integer of 2 or 3 and y is an integer representing the number of repeat alkylene oxide units, (b) a colorant, (c) an optional conductivity enhancing agent, (d) an optional antioxidant, (e) an optional UV absorber, (f) an optional clarifier, (g) an optional tackifier, (h) an optional adhesive, and (i) an optional plasticizer, (2) melting the ink, and (3) causing droplets of the melted ink to be ejected by acoustic beams in an imagewise pattern onto a recording sheet.