Hydrophilic Silane Coating for Erasable Writing Surfaces
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Solution Overview
Problem
Current rewritable writing surfaces, such as dry erase boards and labels, face challenges with durability, receptivity to various writing instruments, and effective erasability, particularly with permanent markers and ghosting issues, and often require solvent-based cleaners that are environmentally and safety concerns.
Innovation Solution
A hydrophilic coating composition is applied to the writing surfaces, comprising a hydrophilic zwitterionic silane that forms a monolayer through siloxane bonds, enhancing durability and erasability, allowing for easy removal of permanent marker writing with water or water-based cleaners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If glass or porcelain surfaces are used for dry erase boards, then the surfaces are easily written on and easily erased after a short time, but writing builds adhesion to the board over time becoming difficult or impossible to remove by wiping with a dry eraser (ghosting)
Solution Approach 1:
The patent applies a hydrophilic coating that changes the surface properties of glass or porcelain, making it more receptive to water-based cleaners. This parameter change in surface hydrophilicity allows the surface to maintain ease of erasing while preventing long-term adhesion buildup that causes ghosting.
Solution Approach 2:
The hydrophilic coating acts as an intermediary layer between the writing surface and the writing instruments. This intermediate layer facilitates easy removal of writing by water-based cleaners while preventing direct adhesion between the marker and the glass or porcelain surface.
2Reliability
If permanent markers are used on glass or porcelain surfaces, then the markers adhere well, but they cannot be easily removed without solvent-based cleaners
Solution Approach 1:
The hydrophilic coating serves as an intermediary layer that allows water-based cleaners to effectively remove permanent marker writing. The coating's hydrophilic properties enable water to penetrate and lift the marker pigment from the surface, eliminating the need for solvent-based cleaners while maintaining reliable marker adhesion during normal use.
3Ease of operation
If solvent-based cleaners are used to remove permanent marker writing, then the writing can be removed, but there are environmental and safety concerns
Solution Approach 1:
The patent converts the harmful effect of requiring solvent-based cleaners into a benefit by applying a hydrophilic coating. This coating changes the surface properties to be compatible with water-based cleaners, transforming the cleaning process from harmful (solvent-based) to benign (water-based), thereby eliminating environmental and safety concerns while maintaining ease of writing removal.
4Adaptability or versatility
If other common dry erase surfaces like coated film, melamine, or painted plastic and steel are used, then they provide writing surfaces, but they have the same cleaning problems as glass and porcelain
Solution Approach 1:
The patent applies a hydrophilic coating that changes the surface parameters of various materials including coated film, melamine, painted plastic, and steel. This parameter change in hydrophilicity enables these diverse materials to achieve easy cleaning properties comparable to glass and porcelain, while maintaining their individual advantages and versatility.
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 hydrophilic coating composition provides robust, durable, and easily erasable writing surfaces that accept a variety of writing instruments, including permanent markers, and can remove ghosting and permanent marker writing with water or water-based cleaners, improving the performance of rewritable articles.
Implementation Method 1
The coating comprises a hydrophilic zwitterionic silane... forming a monolayer through siloxane bonds
Implementation Method 2
The hydrophilic coating composition provides robust, durable, and easily erasable writing surfaces... can remove ghosting and permanent marker writing with water or water-based cleaners
Data Source
AI summary
The present invention relates to articles with rewritable writing surfaces thereon comprising a coating of hydrophilic silane or a hydrophilic water soluble polymer with hydroxyl groups which is crosslinked or chemically reacted to the surface. Also, the present invention relates to methods for making such articles and methods for using such articles.