Aqueous Coating Composition with Starch for Soft-Touch Matte Finish
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Solution Overview
Problem
Current coating compositions are unable to meet the demand for haptic coatings that provide a soft-touch feeling and high-grade appearance, failing to combine attractive visual design with tactile sensations such as soft-touch nubuck-like, smooth, slippery, or rough sandpaper-like effects.
Innovation Solution
Incorporating a certain amount of unmodified starch in powder form into conventional emulsions, particularly aqueous polyurethane dispersions and/or aqueous polyurethane-acrylic resin dispersions, to create an aqueous coating composition that achieves a haptic effect, enhancing scratch resistance and maintaining transparency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional emulsions are used for coating, then the coating process is simple, but the haptic effect and soft-touch feeling cannot be achieved
Solution Approach 1:
The patent combines conventional emulsions with starch particles to create a composite coating composition. This composite approach allows the coating to maintain the simplicity of conventional emulsion application while gaining haptic effects and soft-touch feelings from the starch component, thus resolving the contradiction between ease of manufacture and haptic effect capability
2Ease of operation
If haptic coating compositions are developed to provide soft-touch feeling, then the touch experience is improved, but the scratch resistance may be compromised
Solution Approach 1:
The patent optimizes the starch content parameter within a specific range (2-20 wt%, preferably 4-10 wt%) to achieve the right balance between haptic effect and scratch resistance. By carefully controlling this parameter, the coating provides soft-touch feeling while maintaining adequate mechanical strength and scratch resistance
3Ease of operation
If starch is added to achieve haptic effect, then the soft-touch feeling is improved, but the gloss level increases
Solution Approach 1:
The patent controls the starch particle characteristics (size, shape, and content) to achieve ultra-matte finish with 60° gloss of no more than 5°. By optimizing these parameters, the coating delivers soft-touch feeling while maintaining the desired low-gloss appearance
4Adaptability or versatility
If starch is incorporated into the coating composition, then the haptic effect is achieved, but the preparation process complexity increases
Solution Approach 1:
The patent uses pre-formed starch particles that can be directly incorporated into the emulsion without requiring complex modification or processing steps. This preliminary preparation of starch particles simplifies the overall coating formulation process while still achieving the desired haptic effects
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 resulting coating composition provides a haptic effect with ultra-matte gloss and improved scratch resistance, achieving a delicate, soft touch close to the skin while maintaining excellent transparency and durability.
Implementation Method 1
incorporating a certain amount of unmodified starch in powder form into conventional emulsions
Implementation Method 2
component A comprising a film-forming resin composition
Data Source
AI summary
The present application is directed to an aqueous coating composition and coating and article formed therefrom. In particular, the aqueous coating composition comprises component A comprising a film-forming resin composition, at least one starch, optional aqueous carriers, and optional additional additives; wherein the at least one starch is present in an amount of 2-20% by weight, preferably in an amount of 4-10% by weight relative to the total weight of the component A, and wherein the coating formed by the aqueous coating composition has a 60° gloss of no more than 5° using ASTM D523. The present application is further directed to a coating and article formed from the aqueous coating composition, wherein the coating and article have a haptic effect.