Pigment preparations comprising an organic pigment and a phenol-modified
natural resin derivative having a weight-average molecular weight
(M.sub.w) of from 400 to 10,000 g/mol which is obtainable by reacting a
mixture of reactants containing
a) from 50 to 95% by weight of natural resin or natural resin acids,
b) from 0.5 to 30% by weight of monocyclic or polycyclic phenols,
c) from 0.01 to 15% by weight of aldehydes or aldehyde acetals,
d) from 0.001 to 2% by weight of metal compounds from groups Ia and IIa of
the Periodic Table, and
e) from 4.489 to 30% by weight of .alpha.,.beta.-ethylenically unsaturated
carboxylic acids or their anhydrides
and has an acid number in the range from 160 to 300 mg of KOH per g of
resin, preferably from 200 to 260 mg of KOH per g of resin, are used
advantageously in offset printing.
Pigment as preparações que compreendem um pigment orgânico e um derivative natural phenol-modificado da resina que têm um peso molecular peso-médio (M.sub.w) de 400 a 10.000 g/mol que seja obtenível reagindo uma mistura dos reactants que contêm a) de 50 a 95% pelo peso da resina natural ou de ácidos de resina naturais, b) de 0.5 a 30% pelo peso de phenols monocyclic ou polycyclic, c) de 0.01 a 15% pelo peso dos aldeídos ou dos acetans do aldeído, d) de 0.001 a 2% pelo peso do metal combina dos grupos Ia e IIa da tabela periódica, e e) de 4.489 a 30% pelo peso do alpha., ácidos carboxylic unsaturated de.beta.-ethylenically ou seus anhydrides e tem um número ácido em eparations comprising an organic pigment and a phenol-modified natural resin derivative having a weight-average molecular weight (M.sub.w) of from 400 to 10,000 g/mol which is obtainable by reacting a mixture of reactants containing a) from 50 to 95% by weight of natural resin or natural resin acids, b) from 0.5 to 30% by weight of monocyclic or polycyclic phenols, c) from 0.01 to 15% by weight of aldehydes or aldehyde acetals, d) from 0.001 to 2% by weight of metal compounds from groups Ia and IIa of the Periodic Table, and e) from 4.489 to 30% by weight of alpha..beta.-ethylenically unsaturated carboxylic acids or their anhydrides and has an acid number in the varia de 160 a magnésio 300 do KOH por g da resina, preferivelmente o magnésio 200 a 260 do KOH por g da resina, é usado vantajosamente em imprimir offset.
