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A ketone aldehyde resin having a water

content of less than 0.4% by weight, obtained by condensing at least one ketone with at least one

aldehyde in the presence of at least one alkali metal compound and at least one phase transfer

catalyst in the absence of solvent or in a water-miscible organic solvent, wherein the aldehyde

is added (1) in an initial charge at the beginning of the condensation; and (2) in at least one

further substep following initiation of condensation in (1), wherein the ketone is selected from

the group consisting of 4-tert-amylcyclohexanone, 2-sec-butylcyclohexanone,

2-tert-butylcyclohexanone, 4-tert-butylcyclohexanone, 2-methylcyclohexanone,

3,3,5-trimethylcyclohexanone, and mixtures thereof.