US 9,790,316 B2 · 2-component primer composition and method for producing coatings using the primer composition

Abstract

The present invention relates to an aqueous two-component primer composition comprising (1) a paint base component comprising (A) at least one polyurethane resin having an OH number of 5 to 60 mg KOH/g, (B) zinc phosphate, (C) at least one pigment, and (2) a curing component comprising (D1) at least one polyisocyanate which is an isocyanurate based on hexamethylene diisocyanate, (D2) at least one polyisocyanate which is a polyether-modified isocyanurate based on isophorone diisocyanate, where the stoichiometric ratio of isocyanate groups in the curing component to the complementary hydroxyl groups in the paint base component is greater than 2. The present invention further relates to a method for producing a coating on a metallic substrate, by applying the primer composition of the invention directly to a substrate. Moreover, the present invention relates to a substrate coated by the stated method.

Claims17

Dependent claims

An aqueous two-component primer composition comprising

(1) a paint base component comprising
(A) at least one polyurethane resin having an OH number of 5 to 80 mg KOH/g,
(B) zinc phosphate,
(C) at least one pigment,
and
(2) a curing component comprising
(D1) at least one polyisocyanate which is an isocyanurate based on hexamethylene diisocyanate,
(D2) at least one polyisocyanate which is a polyether-modified isocyanurate based on isophorone diisocyanate,
where the stoichiometric ratio of isocyanate groups of the isocyanurates (D1) and (D2) to the hydroxyl groups present in the at least one polyurethane resin (A) is a ratio from greater than 3 to a ratio of 10.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/760,320Filed 9 Jan 2014 · us provisional application

Priority

EP 1315095111 Jan 2013

Published

US 2015/0344726 A13 Dec 2015

Granted

17 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

C08G 18/6225
Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids: polymers of esters of acrylic or methacrylic acid
B05D 7/542
No clear coat specified: the two layers being cured or baked together
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
C08G 18/4063
Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64: mixtures of compounds of group…

2-component primer composition and method for producing coatings using the primer composition

Life of this patent

2-component primer composition and method for producing coatings using the primer composition

Life of this patent

Abstract

Claims17