Self-adhesive foam article with crosslinked polymer blend
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Solution Overview
Problem
Conventional self-adhesive articles with foam support layers face challenges in maintaining adhesive properties at varying temperatures and shear resistance, especially when applied to irregular or curved surfaces, due to the fragility and limited thermal stability of existing adhesive compositions.
Innovation Solution
A self-adhesive article featuring a foam support layer with an adhesive composition crosslinked using a mixture of polymers containing dialkoxylated silyl functions, polyurethanes, and polyethers, along with a tackifying resin and crosslinking catalyst, providing enhanced elongation, density, and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive compositions are used with foam support layers, then the article can be applied to surfaces, but the adhesive properties deteriorate at varying temperatures and the foam support becomes fragile
Solution Approach 1:
The patent uses a composite adhesive composition containing multiple polymer types (polyurethane, polyether, polyester) with specific functional groups (carboxyl, hydroxyl, amine) in controlled ratios. This composite approach creates synergistic effects that enhance both adhesive reliability and foam support stability across varying temperatures, preventing the fragility issues of conventional single-polymer adhesives.
Solution Approach 2:
The patent specifies precise parameter ranges for the adhesive composition including polymer ratios (20-80% polyurethane, 10-50% polyether, 5-30% polyester), functional group content (0.5-5 mmol/g carboxyl, 0.5-5 mmol/g hydroxyl, 0.1-3 mmol/g amine), and molecular weight ranges. These controlled parameter changes optimize the balance between adhesive performance and foam support durability at varying temperatures.
2Temperature
If the adhesive composition is made more robust for thermal stability, then temperature resistance improves, but the elongation and conformability of the foam support decrease
Solution Approach 1:
The patent applies local quality by distributing different polymer functions throughout the adhesive composition: polyurethane provides structural thermal stability, while polyether and polyester components provide flexibility and elongation. This localized functional distribution within the composite adhesive allows the foam support to maintain both thermal resistance and conformability to irregular surfaces.
Solution Approach 2:
The patent controls the balance between rigid and flexible polymer components through specific parameter ranges: polyurethane content (20-80%) for thermal stability versus polyether (10-50%) and polyester (5-30%) for elongation. The functional group concentrations (carboxyl 0.5-5 mmol/g, hydroxyl 0.5-5 mmol/g, amine 0.1-3 mmol/g) are optimized to achieve both thermal stability and elongation at break greater than 50%.
3Strength
If the adhesive layer is made thicker to improve shear strength, then bonding strength increases, but the article loses conformability to irregular surfaces
Solution Approach 1:
The composite adhesive composition with multiple polymer types creates an inherently more robust material that achieves high shear strength at reduced thickness. The synergistic interaction between polyurethane, polyether, and polyester components allows the adhesive layer to maintain bonding strength while remaining thin and conformable to irregular surfaces, eliminating the need for thick adhesive layers.
Solution Approach 2:
The patent optimizes adhesive layer thickness to 1-10 micrometers by enhancing the intrinsic strength of the composite adhesive composition. The controlled functional group content (carboxyl 0.5-5 mmol/g, hydroxyl 0.5-5 mmol/g, amine 0.1-3 mmol/g) and polymer ratios maximize bonding efficiency per unit thickness, achieving high shear strength while maintaining conformability.
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 achieves excellent adhesive properties, high shear strength, and maintains cohesion over a wide temperature range, allowing the self-adhesive article to be applied to various surfaces, including irregular and curved ones, while ensuring good thermal and sound insulation.
Implementation Method 1
an adhesive layer obtained by crosslinking an adhesive composition
Implementation Method 2
a support layer in the form of a foam and having an elongation at break ranging from 50 to 1200%
Data Source
AI summary
The present invention relates to a self-adhesive article comprising a foam or similar type backing layer and an adhesive layer obtained by cross-linking an adhesive composition. The present invention also relates to a mixture of at least two polymers that can be used to manufacture the self-adhesive article, as well as an adhesive composition comprising said mixture of at least two polymers according to the invention.