Peelable NBR Ink Composition for Durable Erasing on Non-Porous Surfaces
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Solution Overview
Problem
Existing aqueous erasable ink compositions for non-porous substrates face challenges with erasability over time, ink leakage, and poor deposit quality, particularly at elevated temperatures or under mechanical stress.
Innovation Solution
Aqueous peelable ink composition comprising acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR) with an anionic surfactant and coloring agent, which forms a cohesive film on non-porous substrates, allowing for easy removal by mechanical friction without residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional aqueous erasable ink compositions are used, then the ink can be applied to non-porous substrates, but erasability deteriorates after a long period of time
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific film-forming polymers (acrylic polymers, polyvinylidene fluoride, or their copolymers) with controlled molecular weights and ratios, along with specific surfactants and plasticizers, to maintain peelability over extended periods. This compositional parameter optimization enables the ink to remain erasable for at least 1 week, resolving the contradiction between application feasibility and long-term erasability reliability.
2Manufacturing precision
If the ink composition provides good deposit quality, then the written mark has high opacity and vividness, but ink leakage occurs under mechanical stress or elevated temperature
Solution Approach 1:
The patent employs composite material formulation by combining specific film-forming polymers with surfactants, plasticizers, and coloring agents in predetermined ratios. This composite approach creates a cohesive ink system that delivers high-quality deposits with good opacity and vividness while preventing ink leakage under mechanical stress or elevated temperature conditions through the synergistic interaction of multiple components.
3Ease of operation
If the ink composition uses standard viscosity, then it flows well in capillary feed systems, but ink leakage occurs during use or temperature exposure
Solution Approach 1:
The patent optimizes the viscosity parameter of the ink composition to fall within a specific range (1-100 cP) that enables adequate flowability in capillary feed systems while preventing ink leakage during use or when exposed to elevated temperatures. This precise viscosity control, combined with the specific polymer and surfactant formulation, resolves the contradiction between ease of operation and prevention of harmful leakage.
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 composition provides good deposit quality, high erasability, and prevents ink leakage, ensuring the written mark can be easily removed from non-porous surfaces like glass, metals, and polymers without damaging them.
Implementation Method 1
the ink composition comprises an anionic surfactant which decreases the surface tension of the ink composition
Implementation Method 2
When the ink composition is applied to substrates, more specifically a non-porous substrate, the water evaporates and the polymer provides a coalesced film
Implementation Method 3
the polymer provides a coalesced film (also named residue or deposit) on the surface of the substrate
Implementation Method 4
the film can be removed from the surface of the substrate, preferably such as glass, metals, and polymer materials, for some period of time after formation without leaving a visible residue or damaging the substrate
Data Source
AI summary
The present invention relates to an aqueous peelable ink composition substrates comprising: (a) at least one film-forming elastomeric polymer, (b) at least one anionic surfactant, (c) at least one coloring agent, and (d) water, wherein the film-forming elastomeric polymer (a) is acrylonitrile butadiene rubber (NBR) and/or hydrogenated acrylonitrile butadiene rubber (HNBR). The invention also concerns a method for preparing such an aqueous peelable ink composition. A writing instrument comprising such an aqueous peelable ink composition, and a method for writing on a non-porous substrate, are also part of the invention. The invention also concerns a film obtained by drying an ink composition according to the invention, and to a method for obtaining such a film. Finally, the invention aims at a non-porous substrate coated with an aqueous peelable ink composition or a film according to the invention.