Dry Erase Surface Layer C18-C36 Hydrocarbon Erasability
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Solution Overview
Problem
Existing dry erase surfaces fail to completely remove permanent marker ink effectively with a dry paper towel, indicating a need for improved erasability.
Innovation Solution
A writable surface layer comprising a cured hardcoat composition made from the reaction product of compounds with C18-C36 hydrocarbon groups and ethylenically unsaturated groups, present in a specific weight ratio, which provides enhanced erasability without requiring additional low surface energy materials like fluorocarbons or silicones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional dry erase surfaces are used, then basic writing functionality is provided, but permanent marker ink cannot be completely removed with a dry paper towel
Solution Approach 1:
The patent changes the chemical composition parameters of the surface layer by incorporating reaction products of C18-C36 hydrocarbon groups with ethylenically unsaturated groups at specific concentrations (2.8-9.5 wt.%). This parameter modification transforms the surface properties to achieve both permanent marker removability and non-tackiness, resolving the contradiction between erasability and cleanability.
Solution Approach 2:
The patent creates a composite surface layer combining multiple components: the reaction product of C18-C36 hydrocarbon groups and ethylenically unsaturated groups, additional ethylenically unsaturated compounds, and crosslinking agents. This composite structure provides synergistic effects that enable complete permanent marker removal while maintaining surface stability and non-tackiness.
2Ease of operation
If low surface energy materials like fluorocarbons or silicones are added to improve erasability, then permanent marker removal is enhanced, but material complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for traditional low surface energy materials like fluorocarbons and silicones by using an alternative approach: reaction products of C18-C36 hydrocarbon groups with ethylenically unsaturated groups. This extraction principle simplifies the material composition while achieving the desired erasability performance.
Solution Approach 2:
The patent employs hydrocarbon-based reaction products that are simpler and more cost-effective than fluorocarbon or silicone alternatives. These hydrocarbon compounds provide the necessary low surface energy properties without the complexity and high cost associated with fluorinated or siloxane-based materials.
3Ease of operation
If the surface layer is made highly erasable, then permanent marker ink can be removed, but the surface may become tacky at room temperature
Solution Approach 1:
The patent carefully controls the glass transition temperature (Tg) parameter of the surface layer by selecting ethylenically unsaturated compounds with appropriate Tg values and adjusting their concentrations. The reaction product concentration is maintained between 2.8-9.5 wt.% to ensure the surface remains non-tacky at room temperature while achieving superior erasability.
Solution Approach 2:
The patent formulates a composite surface layer combining the C18-C36 hydrocarbon reaction product with other ethylenically unsaturated compounds that have complementary properties. This composite approach balances the erasability enhancement from the hydrocarbon component with the thermal stability and non-tacky properties provided by the additional unsaturated compounds.
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 surface layer allows for complete removal of permanent marker ink with a dry paper towel, maintaining non-tackiness and a glass transition temperature above room temperature, ensuring effective cleanability and durability.
Implementation Method 1
a writable surface layer comprising a cured hardcoat composition comprising the reaction product of one or more compounds of Formula (I)... a minor concentration of the reaction product of a compound comprising a C18-C36 hydrocarbon group and an ethylenically unsaturated group... complete removal of permanent marker ink with a dry paper towel
Data Source
Figure 1
AI summary
Dry erase articles are described comprising a writable surface layer comprising a cured hardcoat composition comprising the reaction product of certain low surface energy compound(s). In one embodiment, the compound(s) comprise a C18-C36 hydrocarbon group and an ethylenically unsaturated group. In another embodiment, a mixture of compounds is utilized, the mixture comprising first compounds comprising a C18-C36 hydrocarbon group and an ethylenically unsaturated group and second compounds comprising a C8-C17 hydrocarbon group and an ethylenically unsaturated group, wherein the first and second compound are present at a weight ratio of 3:2 to 4:1.