Self-Adhesive Foam Article with Crosslinked Adhesive
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Solution Overview
Problem
Conventional self-adhesive articles with foam support layers suffer from low shear strength and poor thermal resistance, making them unsuitable for applications requiring high cohesion over a wide temperature range and adherence to irregular surfaces.
Innovation Solution
A self-adhesive article featuring a foam support layer with an elongation at break of 50-1200% and apparent density of 25-1200 kg/m³, coated with an adhesive layer obtained by crosslinking a composition comprising a mixture of polyurethanes or polyethers with alkoxysilane terminal groups, a tackifying resin, and a crosslinking catalyst, which enhances adhesive properties and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a foam support layer is used in self-adhesive articles, then conformability to irregular surfaces and sound insulation are improved, but shear strength and thermal resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining a foam support layer with specific adhesive compositions containing crosslinking agents. The foam provides conformability and sound insulation, while the crosslinked adhesive network restores shear strength and thermal resistance, creating a composite structure that achieves multiple performance goals simultaneously.
Solution Approach 2:
The patent changes the chemical and physical parameters of the adhesive composition by introducing crosslinking agents and controlling crosslinking conditions. This transforms the adhesive from a simple bonding layer to a crosslinked network structure, fundamentally altering its mechanical and thermal properties to achieve high shear strength and thermal resistance while maintaining foam conformability.
2Adaptability or versatility
If a foam support layer is used in self-adhesive articles, then conformability to irregular surfaces is improved, but thermal resistance deteriorates
Solution Approach 1:
The patent creates a composite structure where the foam support layer is combined with a crosslinked adhesive composition. The crosslinked network in the adhesive layer provides thermal resistance and structural stability, compensating for the foam's lower thermal performance, while the foam maintains its conformability advantage.
Solution Approach 2:
The patent modifies the thermal properties by implementing crosslinking in the adhesive composition. The crosslinked network structure increases the glass transition temperature and reduces thermal softening, thereby improving thermal resistance while the foam layer preserves conformability to irregular surfaces.
3Strength
If crosslinking is applied to adhesive composition, then shear strength and thermal resistance are improved, but adhesive properties may deteriorate
Solution Approach 1:
The patent carefully controls the crosslinking parameters including the type and amount of crosslinking agent, crosslinking temperature, and humidity conditions. By optimizing these parameters, the patent achieves sufficient crosslinking density for high shear strength while preventing excessive crosslinking that would reduce adhesive tack and bonding reliability.
Solution Approach 2:
The patent creates local quality differences in the adhesive composition by using crosslinking agents with specific reactivity and distribution. The crosslinking occurs preferentially in certain regions or at certain stages, creating a gradient structure that maintains adhesive properties at the bonding interface while developing strength in the bulk 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 excellent adhesive and tack properties, high shear strength, and maintains cohesion over a wide temperature range, enabling application on various surfaces, including irregular and complex ones, while offering good thermal and sound insulation.
Implementation Method 1
an adhesive layer obtained by crosslinking an adhesive composition
Implementation Method 2
by absorbing differences in thickness, deformations coming from the installation of the self-adhesive article
Implementation Method 3
Pressure sensitive adhesives (also called self-adhesive glues) are substances giving the support layer also called substrate which is coated with it an immediate stickiness, or tackiness
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.