Block Copolymer Multilayer Coating for Automotive Chromaticity
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Solution Overview
Problem
Existing multilayer coatings in the automotive industry do not consistently achieve sufficient coloristic properties, particularly in terms of chromaticity and chroma values, and require longer process and curing times.
Innovation Solution
A multilayer coating system comprising at least three coating layers, where the second layer is formed from a coating composition containing a block copolymer with a specific backbone and side chains, and the third layer is a clearcoat applied wet-on-wet and jointly cured with the second layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multilayer coatings are used, then the coating process can be completed, but the chromaticity and chroma values are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layers, specifically incorporating a block copolymer with polyester moieties in the second basecoat layer and adjusting the polymer composition in the clearcoat layer. This parameter change in material composition directly improves the chromaticity and chroma values of the cured coating system.
2Productivity
If conventional curing processes are used, then the coating layers can be cured, but the process time and curing time are too long
Solution Approach 1:
The patent changes the curing parameters by selecting specific polymer compositions with reactive functional groups that enable faster cure kinetics. The clearcoat layer contains polymers with carboxyl or hydroxyl groups that react efficiently with isocyanate crosslinkers, reducing the required curing time while maintaining film integrity and color properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed multilayer coating system significantly improves chromaticity and achieves excellent chroma values, while being prepared in an economically advantageous manner with shorter process and curing times.
Implementation Method 1
a second coating layer L2 applied over the first pigmented coating layer L1... wherein the second coating layer L2 is formed from a coating composition comprising at least one block copolymer containing a backbone and at least two blocks B1 and B2... side chains S1 and S2 comprising different polymeric moieties M1 and M2
Data Source
AI summary
The present invention relates to a multilayer coating system present on a substrate and comprising at least three coating layers (L1, L2 and L3) being different from one another, namely a first pigmented coating layer (L1) applied over at least a portion of the substrate, a second coating layer (L2) applied over the first pigmented coating layer (L1), and a third coating layer (L3) applied over the second coating layer (L2), wherein the second coating layer (L2) is formed from a coating composition comprising at least one block copolymer containing a backbone and at least two blocks (B1 and B2) and side chains (S1 and S2) comprising different polymeric moieties (M1 and M2), a method of preparing said multilayer coating system, a coated substrate obtainable therefrom, and a use of a coating composition comprising the block copolymer for improving, in particular for increasing, the chromaticity of the inventive multilayer coating system.