US 10,703,934 B2Granted

Method of forming a multilayer coating film

AssigneeBASF Coatings GmbH

InventorsToru Kurashina, Kazuhiko Shinmura

Life of this patent

Estimating the term…

Loading patent…

Abstract

Provided herein is a method of forming a multilayer coating film including coating, onto an object to be coated, a water-based primer coating composition, wet-on-wet coating a first water-based coloring coating composition, wet-on-wet coating a second water-based coloring coating composition, coating a clear coating composition, and simultaneous hardening of the formed multilayer coating film. The water-based primer coating composition contains a water-based polyolefin resin, a water-based polyurethane resin, a curing agent, and conductive carbon. The first and second water-based coloring coating compositions, each, as base resins, contain a core/shell-type emulsion including an acrylic resin core portion and a polyurethane resin shell portion. The clear coating composition contains a hydroxy-group-containing acrylic resin and a polyisocyanate compound.

Claims8

Dependent claims

A method of forming a multilayer coating film, the method comprising:

a step of coating, onto an object to be coated, a water-based primer coating composition;
a step of wet-on-wet coating a first water-based coloring coating composition;
a step of wet-on-wet coating a second water-based coloring coating composition;
a step of coating a clear coating composition;
and
a step of simultaneous hardening of the multilayer coating film, wherein:
(1) the water-based primer coating composition contains components:
(A) a water-based polyolefin resin with a melting point of 60-100° C. and a weight average molecular weight in the range of 50,000-250,000,
(B) a water-based polyurethane resin having a glass transition temperature (Tg) of −100 to −70° C. and an elongation rate of 500% or more at −20° C.,
(C) a curing agent, and
(D) conductive carbon,
(2) the first water-based coloring coating composition and second water-based coloring coating composition each contain a core/shell emulsion comprising an acrylic resin core portion and a polyurethane resin shell portion as base resins, and
(3) the clear coating composition contains a hydroxy-group-containing acrylic resin and a polyisocyanate compound.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/078,481Filed 14 Mar 2017
Priority: JP 2016-05736822 Mar 2016
Published: US 2019/0023938 A124 Jan 2019
Granted: 7 Jul 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification34 codes

C09D 175/04
Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers: polyurethanes
B05D 7/572
The last layer being a clear coat: all layers being cured or baked together
B05D 7/574
The last layer being a clear coat: at least some layers being let to dry at least partially before applying the next layer
B05D 7/577
The last layer being a clear coat: some layers being coated "wet-on-wet", the others not