Security Paper Clusters Prevent Solvent Forgery
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Solution Overview
Problem
Current security papers are vulnerable to forgery attempts using non-aqueous solvents, as existing treatments relying on organo-soluble dyestuffs can be chemically erased, leading to loss of whiteness and increased costs, and require multiple types of dyestuffs for polar and non-polar solvents.
Innovation Solution
Incorporating clusters of insoluble coloured pigment particles less than 20 μm in size, amalgamated with an ethyl cellulose agglomerating agent that is insoluble in water but almost instantaneously soluble in non-aqueous solvents, distributed throughout the paper pulp, which breaks down upon solvent exposure to create an irreversible stain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organo-soluble dyestuffs are used in security paper, then the paper can be treated against solvent forgery, but the treatment can be chemically erased leading to loss of whiteness and increased costs
Solution Approach 1:
The patent changes the chemical parameters of the dyestuff from organo-soluble to water-soluble, fundamentally altering its interaction with solvents. This parameter change ensures that non-aqueous solvents cannot dissolve or erase the dyestuff, eliminating the chemical erasure vulnerability while maintaining unforgeability detection capabilities
Solution Approach 2:
The patent converts the previously harmful effect of solvent exposure (which caused erasure) into a beneficial detection mechanism. When aqueous solvents are applied, they dissolve the water-soluble dyestuff to create a visible stain, transforming the erasure vulnerability into a positive forgery detection feature
2Adaptability or versatility
If multiple types of dyestuffs are used to cover polar and non-polar solvents, then comprehensive solvent protection is achieved, but the treatment process becomes complex and costly
Solution Approach 1:
The patent employs a single water-soluble dyestuff that serves multiple functions: it provides detection capability against all non-aqueous solvents (polar and non-polar), eliminates the need for multiple dyestuff types, and simplifies the treatment process while maintaining comprehensive solvent coverage
Solution Approach 2:
The patent extracts and eliminates the complexity of using multiple dyestuff types by selecting only water-soluble dyestuffs, thereby removing the need for complex multi-component systems while maintaining effective protection against various solvent types
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
This approach prevents chemical erasure and loss of unforgeability, allows for varied pigment use, simplifies the treatment process, and reduces costs by using inexpensive dyestuffs, while providing a definitive and irreversible staining effect.
Implementation Method 1
an agglomerating agent that is insoluble in water but almost instantaneously soluble in at least one non-aqueous solvent
Data Source
AI summary
The present invention relates to a security paper that cannot be forged with respect to forgery attempts with non-aqueous solvents, characterized in that it comprises on its surface and/or in its bulk, clusters formed of elementary particles that are both insoluble in water and in solvents, amalgamated with an agglomerating agent that is also insoluble in water but almost instantaneously soluble in at least one non-aqueous solvent so as to release said elementary particles in the paper, which elementary particles are preferably less than 20 μm, and more preferably still less than 10 μm, they are colored and are advantageously intense pigment dyestuffs such as those used for producing inks or paints.