| 摘要 |
A printing ink binder comprising a reaction product of I a natural resin, II (a) a phenol-formaldehyde resol, (B) THE COMPONENTS OF II(a), (C) A COMBINATION OF II(a) and II(b) and III a compound of a metal of Group II of the Periodic Table according to Mendelejev, WHICH REACTION PRODUCT HAS A VISCOSITY OF FROM 40 TO 600 CP (50% toluene/20 DEG C), a content of phenol units of from 0.3 to 25% by weight based on the weight of component I, a total amount of at least two metals of from 3 to 12% by weight based on component I, at least 60% by weight of the metal of the salt groups of the reaction product being calcium and at least 5% by weight being at least one metal selected from the group consisting of magnesium and zinc, and the total amount of formaldehyde used is between 0.9 and 4 mol/mol phenol and a composition comprising said binder.
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