Ethylene Polymer Adhesive Strip UV Stability
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Solution Overview
Problem
Current pressure-sensitive adhesive strips based on styrene block copolymers suffer from low aging stability, particularly UV stability, leading to adhesives becoming irreversibly stuck to substrates like window glass, and are not transparent, making them unsuitable for applications requiring residue-free detachment and optical transparency.
Innovation Solution
A pressure-sensitive adhesive strip using an ethylene polymer with specific density and crystallite melting point, combined with tackifying resins and optionally saturated elastomers, which provides high bond strength, UV stability, and transparency, allowing for residue-free detachment and improved optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If styrene block copolymer-based pressure-sensitive adhesives are used to achieve high bond strength, then adhesive performance is improved, but UV stability and aging resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using ethylene polymer with specific density (0.86-0.89 g/cm³) and crystallite melting point (≥105°C), combined with tackifying resins in specific ratios, to achieve both high bond strength and UV stability simultaneously
Solution Approach 2:
The patent creates a composite adhesive system by combining ethylene polymer with specific physical properties and tackifying resins, forming a material that exhibits both high adhesive strength and resistance to UV degradation, overcoming the limitations of single-component styrene block copolymers
2Strength
If styrene block copolymer-based adhesives are used to achieve high bond strength, then adhesive performance is improved, but transparency deteriorates
Solution Approach 1:
The patent selects ethylene polymer with specific density and melting point parameters that inherently provide transparency, and combines it with tackifying resins that maintain optical clarity, achieving both high bond strength and transparency without requiring additional transparent pigments or additives
3Reliability
If anti-aging agents and UV protectants are added to improve UV stability, then aging resistance is improved, but adhesive composition complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for multiple separate anti-aging agents and UV protectants by using a base adhesive composition (ethylene polymer with specific properties combined with tackifying resins) that inherently provides UV stability and aging resistance, simplifying the overall formulation
Solution Approach 2:
The adhesive composition serves itself by using ethylene polymer with specific crystallite melting point and density characteristics that inherently resist UV degradation and aging, without requiring external protective additives, thereby reducing formulation complexity
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 high bond strength, UV stability, and transparency, enabling residue-free detachment and optical clarity, suitable for a wide range of substrates without the need for additional UV protectants or pigments, outperforming previous systems in terms of adhesive performance and visibility.
Implementation Method 1
a pressure-sensitive adhesive strip using an ethylene polymer with specific density and crystallite melting point, combined with tackifying resins
Implementation Method 2
simultaneous realization of very high cohesion and very high bond strengths
Implementation Method 3
can be detached again by stretching essentially in the bond plane without leaving any residue or damage
Data Source
AI summary
The invention relates to the use of a contact adhesive mass in a contact adhesive tape having at least one layer, wherein said tape can be removed without leaving residue and without damage by substantially expanding in the plane of adhesion, wherein at least one layer is formed by the contact adhesive mass, comprising an ethylene polymer having a density between 0.86 and 0.89 g/cm³, preferably between 0.86 and 0.88 g/cm³, particularly preferred between 0.86 and 0.87 g/cm³, and having a crystallite melting point of at least 105°C, preferably at least 115°C, and at least one adhesive resin.