Rinsable Ink Composition with Cyclodextrins for Paper Bleed Control
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Solution Overview
Problem
Current washable inks often stain surfaces and 'bleed through' paper substrates, and lack cost-effective compositions that can be easily rinsed from fabrics and other surfaces without using soap.
Innovation Solution
A rinsable ink composition comprising water, sugars (such as cyclodextrins), dyes, and optional additives, which allows for removal from surfaces like cotton fabric and painted walls using only water, without surfactants or cleaning agents, while maintaining color vibrancy and preventing bleeding through paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric colorants and dye blockers are used to make inks washable, then fabric washability is improved, but cost efficiency deteriorates and the inks still stain surfaces
Solution Approach 1:
The patent changes the chemical composition parameters of the ink by using water-soluble polymers (like PVA) instead of traditional polymeric colorants, and by optimizing the ratio of water, polymer, and dye components. This parameter change achieves both washability and cost efficiency without requiring expensive dye blockers
Solution Approach 2:
The patent creates a simplified copy of the washable ink formula by using basic water-soluble materials (water, common polymers, and standard dyes) rather than complex polymeric colorant systems. This copying approach achieves washability through fundamental water solubility rather than through expensive specialized additives
2Reliability
If traditional washable inks are used, then some washing capability is achieved, but the inks still create stains on surfaces and require soap for removal
Solution Approach 1:
The patent extracts the essential washing capability from complex polymeric systems and isolates it to simple water solubility. By removing dye blockers and using inherently water-soluble polymers, the ink can be washed out with plain water, eliminating the staining problem that persists with traditional washable inks
Solution Approach 2:
The ink formulation uses water-soluble components that enable the ink to be removed by water itself without requiring external cleaning agents like soap. The water in the formulation serves dual purposes: as a solvent during application and as the cleaning agent for removal, achieving self-service washing capability
3Ease of operation
If water-based marker inks are used, then ease of application is improved, but the inks bleed through paper substrates
Solution Approach 1:
The patent creates a composite ink system combining water, water-soluble polymers (PVA, dextrin, or gelatin), and dyes. This composite structure provides both the ease of application from water-based formulation and the bleed resistance from the polymer matrix that holds the dye in place on paper substrates
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 ink composition is effectively rinsable from various surfaces using only water, ensuring non-staining properties and enhanced color brightness, with cyclodextrins enhancing removability and preventing ink from soaking through paper substrates.
Implementation Method 1
one or more cyclodextrins...enhancing color brightness and substantially preventing the ink composition from bleeding through paper substrates
Implementation Method 2
The composition is substantially rinsable from painted walls and cotton fabric by applying only water
Data Source
Figure 1
AI summary
An enhanced washability ink composition has enhanced rinsability and/or washability from fabric, walls, or skin. The composition may comprise about 70 wt% to about 95 wt% water; about 5 wt% to about 35 wt% one or more sugars (e.g., dextrins); about 1 wt% to about 40 wt% one or more optional dye blockers; about 0.1 wt% to about 15 wt% one or more dyes; and one or more optional additives. The rinsable ink composition is usable in a variety of instruments, including markers or pens. A method for making the rinsable ink composition comprises dissolving one or more sugars (e.g., dextrins) in water to form a sugar solution; subsequently adding one or more dyes to the sugar solution to form a sugar-dye solution; and subsequently adding one or more optional dye blockers to the sugar-dye solution.