Cationic paint binders and process for producing same
AssigneeVianova Kunstharz, A.G.
InventorWillibald Paar
Life of this patent
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Abstract
Cationic resins suitable as binders for stoving coating compositions, particularly for application by electro-deposition, and as mill base resins for grinding pigments and extenders; and a process for producing same is described. The resins are produced through reaction of a resinous compound carrying hydroxyl groups with a monoisocyanate which is totally or partially the reaction product of a diisocyanate and a tertiary amine which carries the ring structure ##STR1## wherein R and R.sub.x are a hydrogen atom or an alkyl radical or an aryl radical which may be substituted and wherein n is 2 or 3, the quantity of basic component being chosen in order that the cationic resin has an amine value of at least 35, and preferably of from 40 to 140 mg KOH/g.
Claims12
Cationic resin comprising the reaction product of (1) a polymeric material containing hydroxy groups functionally reactive with an isocyanate group, and (2) a monoisocyanate compound, said monoisocyanate compound being the reaction product of a diisocyanate and a hydroxy-free tertiary amine, said amine having the structure ##STR12## wherein R and R.sub.x are a hydrogen atom;
- an alkyl radical or an aryl radical and n is 2 or 3, the quantity of basic component being selected in order that the cationic resin is at least substantially free of --NCO groups and has an amine value of at least 35 mg KOH/g.
Dependencies are inferred from the claim text.