Pigmented Coating Copolymer Replacing Melamine Resins
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Solution Overview
Problem
Current solvent-based pigmented coating compositions, particularly basecoats, face challenges in achieving excellent intercoat adhesion, stone chip resistance, and hardness while minimizing the use of melamine resins due to their ecological impact, and require a solution that replaces melamine resins without compromising performance properties.
Innovation Solution
A solvent-based pigmented coating composition containing a copolymer obtained by copolymerizing a mixture of olefinically unsaturated monomers, with 10 to 60 mol% of a specific monomer having a vinylsilane group, which replaces melamine resins and enhances ecological profile without sacrificing performance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If melamine resins are used to achieve good performance properties (intercoat adhesion, stone chip resistance, hardness), then the ecological profile deteriorates due to formaldehyde emissions
Solution Approach 1:
The patent extracts and removes melamine resins from the coating composition entirely, replacing them with alternative binder systems (polyester resins, acrylic polymers, vinyl polymers) that do not contain formaldehyde. This extraction eliminates the source of formaldehyde emissions while maintaining the necessary performance properties through the selected alternative polymers.
Solution Approach 2:
The patent employs readily available, inexpensive polymer resins (polyester, acrylic, vinyl) as substitutes for melamine resins. These alternative binders are commercially accessible and cost-effective, providing the necessary performance without the ecological burden of formaldehyde-containing materials.
2Object-generated harmful factors
If melamine resins are reduced or eliminated to improve ecological profile, then performance properties (intercoat adhesion, stone chip resistance, hardness) may deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating system by substituting melamine resin with specific polyester resins, acrylic polymers, and vinyl polymers. These parameter changes in binder chemistry maintain the crosslinking density and film formation properties necessary for intercoat adhesion, stone chip resistance, and hardness without relying on formaldehyde-based crosslinkers.
Solution Approach 2:
The patent creates a composite binder system combining multiple polymer types (polyester resins, acrylic polymers, vinyl polymers) to achieve the synergistic performance properties previously provided by melamine resins. This composite approach ensures that all required performance characteristics are met through the combined properties of the alternative polymers.
3Object-generated harmful factors
If alternative components to replace melamine resins are used, then incompatibilities may arise leading to negative property profiles
Solution Approach 1:
The patent selects polyester resins, acrylic polymers, and vinyl polymers as alternative binders because these materials serve multiple functions: they provide film formation, adhesion, crosslinking capability, and compatibility with standard coating additives and pigments. This multi-functionality ensures that the alternative binder system can replace melamine resins without creating incompatibility issues.
Solution Approach 2:
The patent ensures homogeneous compatibility among all coating components by selecting alternative polymers that are chemically compatible with standard coating ingredients. The polyester, acrylic, and vinyl-based binders are chosen to work harmoniously with common solvents, pigments, and additives, preventing phase separation, settling, or other stability issues that would arise from incompatible material combinations.
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 coating composition achieves excellent intercoat adhesion, stone chip resistance, and hardness, providing a balanced profile of properties while reducing formaldehyde emissions and using more accessible and cost-effective monomers, thus addressing both ecological and economic goals.
Implementation Method 1
copolymer (A) which can be obtained by copolymerization of a mixture of olefinically unsaturated monomers (a)
Implementation Method 2
at least one monomer (a1) having a vinylsilane group
Implementation Method 3
vinylsilane group
Data Source
AI summary
The present invention relates to a solvent-based, pigmented coating agent which contains 0.02 to 0.75 wt.% of at least one copolymer (A) in relation to the total amount of the coating agent, wherein copolymer (A) can be obtained by copolymerization of a mixture of olefinically unsaturated monomers (a) in at least one organic solvent, wherein the mixture of the monomers which is to be polymerized (a) consists of (a1) 10 to 60 mol% of at least one monomer of formula (I), in which R1 = C1-C4 alkoxy, R2 = C1-C4 alkyl and m = 0 to 2, and (a2) 40 to 90 mol% of at least one other olefinically unsaturated monomer, wherein copolymer (A) has a glass transition temperature (Tg) of at least -30 °C. The present invention also relates to a process for producing a multilayer coating using the coating agent and to the multilayer coatings.