Multilayer Polyurethane Protective Films With Silicone PSA for UV Stability
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Solution Overview
Problem
Existing multilayer polyurethane films used for surface protection lack sufficient performance in high-temperature resistance, chemical resistance, and UV stability, particularly when using conventional organic-based pressure sensitive adhesives.
Innovation Solution
A multilayer protective film comprising a first aliphatic polyurethane layer, a second thermoplastic aliphatic polyurethane layer with different properties, and a silicone-based pressure sensitive adhesive, where the layers are bonded using corona treatment and elevated temperatures to enhance adhesion, ensuring superior performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic-based pressure sensitive adhesives are used in multilayer polyurethane films, then the film can be manufactured with standard materials, but the film lacks sufficient high-temperature resistance, chemical resistance, and UV stability
Solution Approach 1:
The patent applies composite materials by combining a polyurethane layer with a silicone-based pressure sensitive adhesive layer. The silicone-based adhesive provides enhanced high-temperature resistance, chemical resistance, and UV stability compared to conventional organic-based adhesives, while maintaining compatibility with the polyurethane substrate. This composite structure resolves the contradiction by integrating materials with complementary properties to achieve superior overall performance.
Solution Approach 2:
The patent changes the chemical composition parameters of the adhesive layer by selecting a silicone-based pressure sensitive adhesive with specific properties (high-temperature resistance, chemical resistance, UV stability). This parameter change in the adhesive material resolves the contradiction by transforming the adhesive from a conventional organic-based formulation to a silicone-based formulation that meets the stringent performance requirements.
2Reliability
If a single-layer polyurethane film is used for surface protection, then the film structure is simple and easy to manufacture, but the film lacks sufficient performance in high-temperature resistance, chemical resistance, and UV stability
Solution Approach 1:
The patent transitions from a single-layer polyurethane film to a multilayer composite structure consisting of a polyurethane layer and a silicone-based pressure sensitive adhesive layer. This composite structure provides enhanced high-temperature resistance, chemical resistance, and UV stability through the synergistic properties of the combined materials, resolving the contradiction between performance and structural simplicity.
Solution Approach 2:
The patent segments the protective film into distinct functional layers: a polyurethane layer providing mechanical protection and a silicone-based pressure sensitive adhesive layer providing enhanced environmental resistance. This segmentation allows each layer to be optimized for its specific function, achieving superior overall performance while maintaining a relatively simple two-layer structure.
3Strength
If conventional adhesives are used in protective films, then the manufacturing process is straightforward, but the adhesion to low-energy surfaces is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by selecting a silicone-based pressure sensitive adhesive specifically formulated for enhanced adhesion to low-energy surfaces. This parameter change in the adhesive chemistry resolves the contradiction by providing superior adhesion strength to challenging substrates while maintaining a relatively simple two-layer film structure.
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 film exhibits enhanced weatherproofness, UV-resistance, and high-temperature performance, with improved adhesion to low-energy surfaces, making it suitable for applications requiring chemical and environmental durability.
Implementation Method 1
a silicone-based pressure sensitive adhesive
Implementation Method 2
bonded using corona treatment
Data Source
AI summary
The present invention relates to multilayer films used to protect a surface, in particular, to such films used to protect surfaces of articles e.g., mobile electronics display protections, smartphones, tablets), industrial touch screens (e.g. machine interfaces), UV stable surfaces and glass protections for machine housings and cockpits (e.g. caterpillars, dumpers), etc.), and, more particularly, to such a multilayer protective film backed by a silicone-based pressure sensitive adhesive (PSA) and having either an aliphatic polyurethane layer or an aliphatic thermoplastic polyurethane layer on top of an aliphatic thermoplastic polyurethane layer, where the two aliphatic polyurethane layers have different physical and/or chemical properties. The present invention also relates to an article that is protected by the multilayer film as well as a method for making the multilayer protective film.