Polymer Coating for Primerless Glass Bonding
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Solution Overview
Problem
The existing process for bonding windows into structures requires a primer for a durable bond, which involves high curing temperatures and makes glass recycling difficult, and existing abrasion-resistant coatings do not provide adequate wet adhesion to glass bonding adhesives.
Innovation Solution
A composition comprising film-forming resins with functional groups, adhesion promoters, fillers, and reactive diluents that can polymerize without high temperatures, providing a primerless bonding solution with enhanced adhesion and abrasion resistance, suitable for curved surfaces and recyclable glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ceramic enamel coating is applied to glass and fired at high temperatures (500-700°C), then the coating provides UV protection and hides underlying color, but the high processing temperatures are undesirable and make glass recycling difficult
Solution Approach 1:
The patent changes the curing temperature parameter from high (500-700°C for ceramic enamel) to low (ambient or slightly elevated temperatures for polymer-based coatings). This is achieved by substituting ceramic materials with polymer resins that cure at much lower temperatures while still providing UV protection through pigment incorporation in the polymer matrix.
Solution Approach 2:
The patent replaces permanent, difficult-to-remove ceramic enamel coatings with organic polymer coatings that can be more easily removed or recycled. The polymer-based coating system allows for easier glass recycling at the end of vehicle life, addressing the environmental concern while maintaining protective functionality.
2Reliability
If primer is applied to ceramic enamel surface to achieve durable adhesive bond, then bonding reliability improves, but the process complexity and number of steps increase
Solution Approach 1:
The patent extracts and eliminates the primer step from the bonding process. By formulating the polymer coating with specific functional groups (hydroxyl, carboxyl, amine) that provide inherent adhesion to adhesive surfaces, the separate primer layer becomes unnecessary. This reduces process complexity from multiple steps (cleaning, priming, bonding) to fewer steps while maintaining bond durability.
Solution Approach 2:
The patent merges the protective coating function with the adhesive bonding function into a single integrated system. The polymer coating that provides UV protection and aesthetic appearance also contains functional groups that promote direct adhesion to adhesives, combining what were previously separate functions (coating protection and bonding surface preparation) into one unified solution.
3Strength
If existing abrasion-resistant coatings are applied to glass, then surface hardness improves, but wet adhesion to glass bonding adhesives is insufficient
Solution Approach 1:
The patent creates a composite polymer coating system that combines abrasion-resistant fillers (such as alumina, silica, or other hard particles) with polymer resins that contain adhesion-promoting functional groups. This composite structure provides both the desired surface hardness for abrasion resistance and the chemical functionality for strong adhesive bonding, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality by incorporating adhesion-promoting functional groups (hydroxyl, carboxyl, amine) at the coating-adhesive interface region of the polymer coating. This localized functionalization ensures strong wet adhesion to adhesives while maintaining the overall abrasion-resistant properties of the coating bulk, allowing different regions of the coating to fulfill different functions.
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 enables durable, primerless bonding of glass or coated plastic to structures with improved adhesion and abrasion resistance, allowing for recycling and reduced environmental impact, while maintaining low UV light transmission and high surface hardness.
Implementation Method 1
one or more film forming resins having at least one functional group capable of polymerizing
Implementation Method 2
adhesion promoters which enhance the adhesion of the coating to glass, coated plastic and/or adhesives
Data Source
AI summary
A composition comprising: a)one or more film forming resins having at least one functional group capable of polymerization; b) one or more adhesion promoters comprising compounds containing one or more unsaturated groups capable of free radical polymerization and one or more trialkoxy silane groups; c) one or more fillers capable of imparting abrasion resistance to the composition; d) one or more compounds which is reactive with the film forming resin which also contains an acidic moiety; and e) one or more compounds comprising a siloxane backbone and one or more active hydrogen groups capable of reacting with the functional groups on a glass bonding adhesive: one or more second adhesion promoters comprising one or more silicon, titanium, zirconium, aluminum, or metal containing compounds; organic materials having reactive groups reactive with reactive groups on the surface of substrates or adhesives; or mixtures thereof.