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US 4,788,076 AGranted
Powdered lacquer, its manufacture and use
AssigneeHuls Aktiengesellschaft
InventorJoern-Volker Weiss
Life of this patent
Estimating the term…
Abstract
The invention relates to powdered lacquers based on a mixture of epoxide compounds and optionally polyesters as well as salts of primary C.sub.4-18 aliphatic and cycloaliphatic-diamines with phosphoric acid and/or sulphuric acid as a hardener, as well as other additives and a method for the manufacture of flat finish coatings.
Claims19
A powdered lacquer which is stable in storage, comprising:
- (a) at least one epoxide containing compound having a melting point above 40.degree. C., wherein said compound comprises on the average more than one epoxide group per molecule;
- (b) a nitrogen-containing salt in an amount effective as hardener, wherein said salt comprises a salt prepared from an acid and a base, said acid selected from the group consisting of phosphoric acid and sulfuric acid, and said base selected from the group consisting of primary C.sub.4-18 aliphatic and C.sub.4-18 cycloaliphatic diamines, at least one equivalent of said acid reacting with an amino group;
- and
- (c) 0.5 to 1 wt %, relative to the total weight of the lacquer, of 1,4-diazabicyclo-[2.2.2]-octane.
1 more element
A method for the manufacture of a flat finish coating, comprising the steps of:
- (i) mixing at least one epoxide-containing compound, a nitrogen-containing salt in an amount effective as hardener, and 0.5 to 1 wt %, relative to the total weight of the coating, of 1,4-diazabicyclo-[2.2.2]-octane;
- (ii) extruding said mixture at a temperature between about 160.degree.-240.degree. C.;
- cooling said extrusion, and grinding said cooled extrusion;
- (iii) applying said ground mixture to a substrate to coat said substrate;
- and
- (iv) heating said coated substrate at a temperature from about 160.degree.-240.degree. C. for about 5-35 minutes, wherein said epoxide-containing compound comprises in the average more than one epoxide group per molecule having a melting point above 40.degree. C., and said nitrogen-containing salt comprises a salt prepared from an acid and a base, said acid selected from the group consisting of phosphoric acid and sulfuric acid, and said base selected from the group consisting of primary C.sub.4-18 aliphatic and C.sub.4-18 cycloaliphatic diamines, at least one equivalent of said acid group reacting with an amino.
3 more elements
Dependencies are inferred from the claim text.