Web-Shaped Adhesive Compound with Polyurethane Fillers
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Solution Overview
Problem
Microballoon foaming in pressure sensitive adhesive (PSA) compounds enhances shock performance but introduces a predetermined breakage point leading to cohesive splitting, while the absence of microballoons results in adhesive failure and increased energy requirement for bond separation under shock load.
Innovation Solution
Replacing microballoons with polyurethane- or silicone-based fillers, particularly in spherical form, to enhance shock performance and prevent cohesive splitting, while also improving opacity through the use of colored fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If microballoon foaming is used in PSA compounds, then shock performance is enhanced, but cohesive splitting occurs at the hollow microspheres creating a predetermined breakage point
Solution Approach 1:
The patent extracts the harmful hollow microsphere structure from the system while retaining the beneficial shock absorption function. By replacing microballoons with solid polyurethane- and/or silicone-based fillers, the invention removes the predetermined breakage points (hollow microspheres) that cause cohesive splitting, while the solid filler particles continue to provide shock absorption through their mechanical properties and distribution within the adhesive matrix.
Solution Approach 2:
The invention changes the physical state and material composition of the filler from hollow microsphere structure to solid polyurethane- and/or silicone-based particles. This parameter change transforms the failure mechanism by eliminating the hollow cavity structure that creates weak points, while maintaining or enhancing shock absorption through the solid filler's elasticity, hardness, and distribution characteristics in the adhesive compound.
2Reliability
If microballoon foaming is omitted in PSA compounds, then cohesive splitting is prevented, but adhesive failure occurs and energy requirement for bond separation increases
Solution Approach 1:
The patent creates a substitute structure that copies the beneficial shock absorption function of microballoons without replicating their harmful hollow structure. The solid polyurethane- and/or silicone-based fillers are designed to mimic the volume, distribution, and mechanical response characteristics of microballoons under shock loading, while eliminating the cavity-induced weak points that lead to cohesive splitting and adhesive failure.
3Illumination intensity
If colored fillers are used in PSA compounds, then opacity is improved, but additional material complexity is introduced
Solution Approach 1:
The patent merges multiple functions into a single filler component: the polyurethane- and/or silicone-based fillers simultaneously provide shock absorption, structural reinforcement, and optical opacity through their inherent material properties and pigmentation. This consolidation eliminates the need for separate functional additives, reducing overall material complexity while achieving enhanced opacity through the colored filler particles themselves.
Data Source
AI summary
The present invention relates to a web-shaped adhesive compound which contains at least one poly(meth)acrylate and optionally at least one synthetic rubber; and at least one polyurethane- and/or silicone-based filler. The invention also relates to a process for preparing such an adhesive compound and to the use thereof. The invention further relates to the use of polyurethane- and/or silicone-based fillers for increasing the adhesive power of adhesive compounds containing at least one poly(meth)acrylate and optionally at least one synthetic rubber and/or for increasing the shock performance of such adhesive compounds with respect to adhesive compounds which do not contain any polyurethane- and/or silicone-based filler.