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US 6,719,836 B2Granted
Water-based two component protective coating compositions
AssigneeSigma Coatings B.V.
InventorsArnold Johan Nederlof, Cors Daniël van Zanten, Jan de Jong, Cornelis Hubertus van Vliet
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Abstract
Water-based protective coating compositions contain as binder the product obtained by the reaction of an aminosilane, in acid solution, with a sub-stoechiometric amount of an epoxysilane, and further contain finely divided zinc and dispersed pigments.
Claims3
Protective coating compositions essentially consisting of the following components in aqueous solution:
- a) for the first component:
- (i) at least one omega-aminoalkyl trialkoxy silane;
- (ii) at least one acid, in an amount sufficient to obtain a pH of 7to 9;
- (iii) at least one compound each having as terminal groups a trialkoxy or alkyldialkoxy silane and an epoxy group, in an amount such that the ratio of the amine hydrogen equivalent of the omega-aminoalkyl trialkoxysilanes to the epoxy equivalent of the said compound is of 3 to 7;
- the reaction of (i) to (iii) forming a binder;
- (iv) one or more pigments, at least 25 wt % of the pigments having conductive properties;
- for the second component:
- (v) zinc particles, the weight ratio of zinc to pigments being of from 1:10 to 10:1;
- the weight ratio of solid binder to the total of zinc and pigments being of 1:1 to 1:75.
6 more elements
Dependencies are inferred from the claim text.