Flowable Ketone Aldehyde Resins for Low-Solvent Coatings
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Solution Overview
Problem
Existing dispersing resins for solventborne pigment preparations are unsuitable for producing low-solvent coatings due to high viscosity and potential for yellowing, requiring additional solvents or polyethers that can dilute the resin and affect coating properties.
Innovation Solution
Development of flowable ketone aldehyde resins with a specific molar ratio of aldehydes and CH-acidic ketones, which are stable and do not require solvents or polyethers, allowing for the production of low-solvent pigment preparations without compromising film hardness, drying speed, compatibility, or resistance to yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional dispersing resins (urea-aldehyde, ketonaldehyde) are used to achieve broad solubility and compatibility, then pigment-binding capacity is improved, but solution viscosity becomes too high requiring additional solvents
Solution Approach 1:
The patent changes the chemical composition parameters by using polyether-modified urea-aldehyde resins with specific polyether content (5-50 wt%) and molecular weight (Mn: 350-900 g/mol), which fundamentally alters the viscosity characteristics while preserving pigment-binding capacity through the urea-aldehyde backbone structure
Solution Approach 2:
The invention creates a composite resin system combining urea-aldehyde resin with polyether modifiers, where the polyether component provides flowability and low viscosity while the urea-aldehyde portion maintains high pigment-binding capacity and compatibility
2Ease of operation
If solvents are added to reduce viscosity of solid resins, then processability is improved, but the formulation of low-solvent coating compositions becomes impossible
Solution Approach 1:
The patent fundamentally changes the physical state parameter from solid to liquid by incorporating polyether modifiers, enabling the resin to be processed in low-solvent formulations (≤50 wt% solvent) without requiring high solvent content for viscosity reduction
3Ease of operation
If polyethers are added to achieve flowability, then liquid state is obtained, but yellowing resistance and thermal stability deteriorate
Solution Approach 1:
The invention creates a balanced composite where polyether modifiers (5-50 wt%) provide necessary flowability while the dominant urea-aldehyde resin matrix (50-95 wt%) maintains yellowing resistance and thermal stability, achieving a synergistic combination of properties
4Ease of operation
If high solvent content (up to 50 wt%) is used to achieve processable viscosity, then solution viscosity is reduced, but low-solvent coating formulations become impossible
Solution Approach 1:
The patent changes the resin's inherent viscosity characteristics through polyether modification, enabling low viscosity at low solvent content (≤50 wt%), thereby allowing formulation of low-solvent coating compositions that were previously impossible with traditional resins
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 new resins enable the production of low-solvent coatings with improved stability and performance, maintaining film hardness and resistance to yellowing while eliminating the need for solvents or polyethers, thus enhancing the usability and stability of the coatings.
Implementation Method 1
The condensation according to the invention of at least one aldehyde and at least one CH-acidic ketone gives flowable grinding resins
Data Source
AI summary
The present invention relates to dispersing resins for conventional solvent-based pigment preparations with a low to very low proportion of volatile organic compounds and their use in solvent-based coating materials such as paints, varnishes, adhesives, inks or printing inks, and for coloring plastics. The pigment preparations produced with these resins are non-yellowing, weather-resistant, low-viscosity, and intensely colored.