vikasm
07-21-2009, 07:45 AM
A ketone aldehyde (http://www.useful-chemicals.com/) 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.
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.