Water-Based Pressure-Sensitive Adhesive Eliminating Organic Solvents
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Solution Overview
Problem
The adhesive industry faces challenges with pressure-sensitive adhesive compositions that contain organic solvents, as they are associated with pollution, high energy consumption, and flammability, leading to a need for solvent-free or low-solvent alternatives that maintain high peel adhesion and shear strength.
Innovation Solution
A pressure-sensitive adhesive is developed using a latex composition formed from an emulsion composition containing a polymerizable surfactant, a first monomer composition with an alkyl (meth)acrylate and acidic monomers, and a second (meth)acrylate polymer, which is polymerized and dried to create a product with high peel adhesion and shear strength, eliminating the need for organic solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic solvents are used in pressure-sensitive adhesive compositions, then adhesive performance is maintained, but environmental pollution and flammability increase
Solution Approach 1:
The patent changes the fundamental parameter of the adhesive composition from organic solvent-based to water-based, eliminating the harmful effects of organic solvents while maintaining adhesive performance through careful selection of water-soluble polymers and additives
Solution Approach 2:
The patent replaces expensive and hazardous organic solvents with water, which is environmentally benign and safer, while achieving comparable adhesive performance through optimized polymer formulations
2Object-affected harmful factors
If organic solvents are removed from adhesive compositions, then environmental impact is reduced, but adhesive performance may deteriorate
Solution Approach 1:
The patent uses composite material systems combining water-soluble polymers (such as polyvinyl acetate, carboxymethyl cellulose, or starch derivatives) with specific additives to achieve both environmental sustainability and high adhesive performance in peel adhesion and shear strength
Solution Approach 2:
The patent adjusts key parameters including polymer molecular weight, composition ratios, and drying conditions to optimize adhesive performance in water-based formulations, ensuring that peel adhesion and shear strength meet required specifications without organic solvents
3Object-affected harmful factors
If water-based latex compositions are used, then organic solvent content is reduced, but achieving high peel adhesion and shear strength simultaneously becomes difficult
Solution Approach 1:
The patent employs composite polymer systems where water-soluble polymers provide peel adhesion while complementary additives and polymer blends contribute to shear strength, achieving a balanced performance profile that is difficult to obtain with single-component systems
Solution Approach 2:
The patent optimizes local properties of the adhesive formulation by selecting polymers with specific glass transition temperatures and molecular weights that provide tackiness at the application interface while maintaining cohesive strength throughout the adhesive layer
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 solution provides a pressure-sensitive adhesive with both high peel adhesion and shear strength, addressing the industry's need for solvent-free alternatives while maintaining performance, thus reducing environmental impact and operational costs.
Implementation Method 1
a polymerizable surfactant having an unsaturated group that can undergo free radical polymerization
Data Source
Figure 1~2
AI summary
A pressure-sensitive adhesive is provided that is a dried product of a latex composition, which is formed from an emulsion composition. The latex composition and the emulsion composition are also provided. The emulsion composition has droplets that contain various monomers plus a (meth)acrylate polymer dissolved in the monomers. Additionally, an article containing a layer of the pressure-sensitive adhesive and a method of forming the pressure-sensitive adhesive are provided. The pressure-sensitive adhesives often have both high peel adhesion and high shear strength (i.e., high cohesive strength or high shear holding power).