Multiphase Acrylate Adhesive for Residue-Free Printing Plate Removal
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Solution Overview
Problem
Existing pressure-sensitive adhesives for bonding printing plates in flexographic printing face challenges such as increased adhesive strength over time on polar substrates, leading to difficult removal and potential damage, and are susceptible to contamination from printing ink residues in solvents, which enhances adhesive strength undesirably.
Innovation Solution
A pressure-sensitive adhesive comprising a polymer blend with at least 60% by weight of a polymer blend, consisting of a first polymer component A based on polyacrylate and a second polymer component B, where the polymer components are not homogeneously miscible, creating a multiphase system that reduces the adhesive's sensitivity to printing ink residues and maintains secure bonding on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesives are used for bonding printing plates on polar substrates, then adhesive strength increases significantly over time, but removal becomes difficult and may cause damage to the substrate or adhesive tape
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using a specific polymer blend (at least 60% polyacrylate-based polymer) with controlled glass transition temperature ( -50°C ≤ TG ≤ 0°C) and specific molecular weight characteristics. This parameter optimization allows the adhesive to maintain appropriate bonding strength while enabling easy removal without damage, resolving the contradiction between strength and removal ease.
Solution Approach 2:
The patent employs a composite adhesive system consisting of multiple polymer components with different properties. The blend includes polyacrylate-based polymers with specific characteristics and potentially other polymers that complement each other, creating a composite material that achieves both strong bonding and easy removal. The synergistic combination of different polymer components allows the adhesive to perform both functions simultaneously.
2Reliability
If conventional pressure-sensitive adhesives are used, then bonding is achieved on various surfaces, but the adhesive is susceptible to contamination from printing ink residues in solvents, which undesirably enhances adhesive strength
Solution Approach 1:
The patent converts the potentially harmful effect of solvent contamination into a beneficial outcome. The specific polymer blend composition (at least 60% polyacrylate-based polymer with controlled TG and molecular weight) is designed to interact with solvent components in a way that actually strengthens the adhesive bond rather than degrading it. The adhesive utilizes the solvent's presence to enhance bonding, transforming the contamination issue into an advantage.
Solution Approach 2:
The patent optimizes the adhesive's chemical parameters, specifically using polyacrylate-based polymers with glass transition temperatures between -50°C and 0°C and controlled molecular weights. These parameter changes create an adhesive that is inherently resistant to solvent contamination while maintaining bonding reliability. The specific polymer characteristics prevent unwanted interactions with ink residues while ensuring consistent performance.
3Strength
If pressure-sensitive adhesive tape is used for bonding printing plates, then bonding is achieved, but the adhesive must be removed without leaving residue on polar substrates like steel, which is particularly difficult
Solution Approach 1:
The patent precisely controls the polymer blend parameters, using at least 60% polyacrylate-based polymer with glass transition temperature between -50°C and 0°C. This parameter optimization enables the adhesive to maintain strong bonding on polar substrates while ensuring complete removal without residue. The specific TG range and molecular weight characteristics are critical for achieving residue-free removal on high surface energy surfaces like steel.
Solution Approach 2:
The patent employs a composite polymer blend system that combines polyacrylate-based polymers with specific characteristics and potentially other complementary polymers. This composite approach creates an adhesive that achieves both strong bonding and complete removal without residue. The synergistic combination of different polymer components allows the adhesive to perform both functions simultaneously, particularly on challenging polar 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 adhesive ensures easy and residue-free removal of printing plates from surfaces, even after extended periods, while maintaining strong bonding and stability on polar substrates like steel, and is resistant to contamination from printing ink residues, facilitating efficient and damage-free reuse of printing plates.
Implementation Method 1
a pressure-sensitive adhesive comprising at least 60% by weight of a polymer blend, the polymer blend consisting of a first polymer component A based on polyacrylate and at least one second polymer component B based on polyacrylate
Implementation Method 2
the polymer components are not homogeneously miscible, creating a multiphase system that reduces the adhesive's sensitivity to printing ink residues
Data Source
Figure 1a~1b
Figure 2~3
Figure 4~5
AI summary
The invention relates to an adhesive compound comprising at least 60 wt.% of a polymer blend, wherein the polymer blend consists of a first polymer component A, a second polymer component B and optionally one or more further polymer components (C, D, ...), wherein the first polymer component A is present in the polymer blend to at least x wt.%, wherein 90 ≤ x ≤ 99 and wherein the second polymer component B and the optionally present further polymer components C, D, ... are present in the polymer blend to a total of y wt.%, wherein y = 100 - x, wherein each polymer component (A, B, C, ...) is attributable to (meth)acrylic monomers to at least 60 wt.%, wherein none of the polymer components (A, B, C, ...) is homogeneously miscible with any of the other polymer components (A, B, C, ...) at room temperature, so that a multiphase system is present.