Removable PSA Copolymer Composition for Clean Alkaline Release
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Solution Overview
Problem
Existing pressure-sensitive adhesives are not effectively removable under neutral or basic conditions, require high amounts of water-soluble polymers and solvents, and often leave residues or contaminate surfaces, limiting their applicability and environmental compatibility.
Innovation Solution
A polymeric composition is produced via a two-stage emulsion polymerization process using isosorbide-derived monomers with ethylenically unsaturated bonds, which forms a copolymer suitable for pressure-sensitive adhesives that can be removed under neutral or basic conditions without leaving residues, utilizing a mixture of monofunctional and difunctional monomers for improved adhesion and removability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used, then strong adhesion is achieved, but removability under neutral or basic conditions is poor
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating isosorbide-derived monomers with specific functional groups that enable pH-responsive behavior. The adhesive composition is modified to contain monomers that can undergo hydrolysis or depolymerization under neutral or basic conditions, allowing the adhesive to be removed when exposed to water or aqueous solutions without compromising initial adhesion strength.
Solution Approach 2:
The patent creates a composite polymeric system by copolymerizing isosorbide-derived monomers with other ethylenically unsaturated monomers. This composite structure combines the adhesive properties of conventional polymers with the removability characteristics of water-soluble or hydrolyzable components, achieving both strong initial bonding and controlled removal under basic conditions.
2Ease of operation
If high amounts of water-soluble polymers and solvents are used to improve removability, then the adhesive becomes removable under neutral or basic conditions, but environmental compatibility deteriorates due to residues and contamination
Solution Approach 1:
The patent extracts or eliminates harmful components from the adhesive system by replacing conventional water-soluble polymers and volatile organic compound solvents with isosorbide-derived monomers that polymerize to form the adhesive matrix. This extraction removes the sources of residues and contamination while maintaining the desired removability through controlled hydrolysis of the isosorbide ester linkages under basic conditions.
Solution Approach 2:
The patent converts the potential harm of water-soluble components (which cause residues) into a benefit by using isosorbide-derived monomers that are designed to hydrolyze cleanly under basic conditions. The ester bonds in the isosorbide structure break down into harmless, water-soluble products that do not leave residues, transforming the removability mechanism from a harmful to a beneficial process.
3Ease of operation
If conventional adhesive formulations are used, then easy applicability is achieved, but environmental compatibility worsens due to volatile organic compounds
Solution Approach 1:
The patent changes the formulation parameters by replacing volatile organic compound solvents with water or water-miscible carriers. The isosorbide-derived monomers are designed to be compatible with water-based systems, allowing the adhesive to be applied in environmentally friendly formulations that eliminate VOC emissions while maintaining ease of application through appropriate viscosity control and curing mechanisms.
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 resulting adhesive provides excellent adhesion and removability under defined conditions, is environmentally friendly, and reduces the need for volatile organic compounds, offering high-performance properties for various applications.
Implementation Method 1
pressure-sensitive adhesives are viscoelastic materials which can adhere strongly to solid surfaces upon application of a light contact pressure and in short contact times
Implementation Method 2
removable under neutral or basic (alkaline) conditions (i.e. in contact with water [i.e. water in liquid state] under neutral or basic/alkaline conditions)
Data Source
AI summary
The present invention refers to a method for producing polymeric compositions, preferably dispersions (i.e. emulsions or latices), which are particularly useful as or in adhesives, especially pressure-sensitive adhesives, particularly pressure-sensitive adhesives removable under neutral or basic (alkaline) conditions, as well as to the polymeric compositions thus produced and to their various applications.