Cellulosic Substrate Applicator with Cationic Adhesive
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Solution Overview
Problem
Existing compositions containing cationic components cannot be effectively impregnated onto cellulosic substrates due to the anionic nature of cellulose, limiting their use in surface treatments and requiring separate applicators, which complicates storage, transport, and application.
Innovation Solution
A multi-layer cellulosic substrate applicator with anionic sites adhered by a cationic adhesive composition, including water-soluble polymers like PVOH and cationic biocides, allowing for the storage and transport of cationic compositions in a dry form that can be activated upon use, providing biocidal and skin-compatible properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cationic compositions are impregnated onto cellulosic substrates, then storage and transport convenience is improved, but the anionic nature of cellulose deactivates the cationic components
Solution Approach 1:
The patent uses a polyvinyl alcohol (PVOH) carrier polymer as an intermediary substance. The PVOH forms a complex with the cationic biocide (e.g., quaternary ammonium compound), creating a stable association that prevents the cationic component from being deactivated by the anionic cellulose substrate. This intermediary complex allows the active ingredient to remain effective while being stored and transported in impregnated form on the cellulosic substrate.
Solution Approach 2:
The invention creates a composite material system consisting of three components: the cellulosic substrate (providing structural basis and absorbency), the PVOH carrier polymer (providing stabilization and controlled release), and the cationic biocide (providing antimicrobial activity). This composite structure enables the cationic composition to be effectively impregnated onto the substrate without deactivation, combining the benefits of convenient storage/transport with maintained efficacy.
2Reliability
If cationic compositions are supplied in containers with separate applicators, then efficacy is maintained, but device complexity and user inconvenience increase
Solution Approach 1:
The patent merges the composition container and the applicator into a single integrated unit. The cationic composition is impregnated directly onto the cellulosic substrate, which serves as both the storage medium and the application tool. Users simply need to activate the substrate (e.g., by adding water or moisture from the surface) to release the composition, eliminating the need for separate containers and applicators while maintaining efficacy.
Solution Approach 2:
The cellulosic substrate with impregnated composition is designed to be self-activating. When contacted with moisture (from water addition or from the surface being treated), the PVOH-cationic biocide complex automatically releases the active ingredient onto the surface. This self-service mechanism eliminates the need for separate application tools and simplifies the user process while ensuring proper composition delivery.
3Reliability
If potassium citrate is used to prevent deactivation, then some protection is provided, but cationic strength is insufficient against strong attraction to anionic sites
Solution Approach 1:
The patent changes the chemical parameters of the system by replacing potassium citrate with a polyvinyl alcohol carrier polymer. The PVOH has different chemical properties that allow it to form a stable complex with the cationic biocide, providing stronger protection against deactivation by anionic sites. This parameter change in the carrier substance enables the cationic composition to maintain its strength and effectiveness even in the presence of strong anionic attraction from the cellulose substrate.
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 solution enables convenient, cost-effective storage and transport of cationic compositions, maintaining high efficacy in disinfection and skin treatment while reducing packaging costs and improving user convenience, with the treated surfaces achieving significant microbial reduction and skin health benefits.
Implementation Method 1
cellulose and its various derivatives are significantly anionic in character and therefore would be expected to very effectively deactivate cationic molecules
Implementation Method 2
said layers being adhered to each other by an adhesive composition
Data Source
AI summary
An applicator for providing an active composition to a surface, the applicator comprising a cellulosic substrate having anionic sites (e.g. paper, paper laminates, cardboard or a woven or non-woven plant fabric such as a wood pulp or cotton material); and an impregnated or coated composition, the impregnated composition comprising a bioactive cationic component in an amount sufficient in use to deactivate the anionic sites in the cellulosic substrate and to provide a desired effect, for example, a biocidal effect, enhanced skin feel, enhanced skin health and fabric softening. The applicator may be in the form of a sheet wipe, with a single or multiple layers of cellulosic substrate. The applicator is preferably substantially dry. Also, an applicator for providing an active composition to a surface, the applicator comprising at least two layers of cellulosic substrate having anionic sites; said layers being adhered to each other by an adhesive composition comprising a cationic component in an amount sufficient in use to deactivate the anionic sites in the cellulosic substrate and to provide a desired effect. The adhesive composition may also comprise a water-soluble or water dispersible adhesive polymer. Also methods of preparing and using the applicator e.g. to disinfect skin or an inanimate surface.