Crosslinkable Adhesive for Curved Surfaces
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Solution Overview
Problem
Current pressure-sensitive adhesives (PSAs) lack sufficient repulsion resistance and cohesive strength, particularly in applications involving curved or bended surfaces, and fail to provide residue-free removal, which is crucial for electronic devices and printing processes.
Innovation Solution
A crosslinkable adhesive system comprising a base polymer with both covalent and coordinative crosslinkers, specifically acrylate adhesives, is developed, where covalent and coordinative crosslinkers are used in defined molar ratios to enhance repulsion resistance and cohesive strength while maintaining reworkability and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a PSA is designed to have high repulsion resistance for curved surfaces, then the adhesive can hold deformed flexible articles, but the adhesive may leave residues upon removal
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific polymer components (polyisobutylene, polyalphaolefin) with controlled molecular weights and compositions, along with precise ratios of tackifiers and plasticizers, to achieve the optimal balance between repulsion resistance and residue-free removal
Solution Approach 2:
The patent creates a composite adhesive system combining multiple polymer components (polyisobutylene as base polymer, polyalphaolefin as secondary polymer), tackifiers, and plasticizers in specific proportions to achieve synergistic effects that simultaneously provide high repulsion resistance and clean removal properties
2Strength
If the adhesive is made highly cohesive to resist propulsion forces, then the adhesive bond strength increases, but the adhesive loses reversibility and becomes difficult to remove
Solution Approach 1:
The patent adjusts the glass transition temperature and molecular weight parameters of the polymer components, specifically using polyisobutylene with Mn of 100,000-1,000,000 and controlling the polyalphaolefin content at 1-50 parts by weight per 100 parts polyisobutylene, to achieve optimal cohesive strength while maintaining reversibility
Solution Approach 2:
The patent creates different functional zones within the adhesive layer by strategically placing polymers with different Tg values and molecular weights, where the polyisobutylene provides the cohesive backbone and the polyalphaolefin and additives provide localized flexibility and reversibility
3Reliability
If the adhesive is optimized for high repulsion resistance at elevated temperatures, then the adhesive can withstand printing conditions, but the adhesive performance deteriorates at other temperatures
Solution Approach 1:
The patent selects polymer components with specific glass transition temperatures (polyisobutylene with Tg of -100°C to -60°C and polyalphaolefin with Tg of -120°C to -80°C) and controls their ratios to ensure the adhesive maintains stable performance across a broad temperature range from -40°C to +80°C
Solution Approach 2:
The patent designs the adhesive composition to perform multiple functions simultaneously: the polyisobutylene provides base cohesion and temperature stability, while the polyalphaolefin and plasticizers provide flexibility and adaptability across different temperature conditions, making the adhesive universally applicable
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 system achieves improved repulsion resistance, cohesive strength, and reworkability, ensuring residue-free removal and durability across various temperatures and usage conditions, particularly in electronic and printing applications.
Implementation Method 1
at least one first base polymer component having functional groups suitable for covalent crosslinking
Implementation Method 2
functional groups suitable for covalent crosslinking and for coordinative crosslinking
Data Source
AI summary
Crosslinkable adhesive compound comprising at least a first base polymer component having functional groups suitable for covalent crosslinking and for coordinative crosslinking, and comprising at least one covalent crosslinker and at least one coordinative crosslinker, wherein the coordinative crosslinker is present in molar excess in relation to the covalent crosslinker.