Silane Functional Adhesive for Unprimed Vehicle Windows
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Solution Overview
Problem
Existing adhesive compositions for bonding glass to coated substrates, such as in vehicle window installation, often require a primer, which introduces additional steps, costs, and risks, and struggle with bonding to acid-resistant paints, requiring improved adhesion, rapid cure, and long-term durability without priming.
Innovation Solution
A silane functional adhesive composition comprising polymers with flexible backbones, hydrophobic silanes, and catalysts that can bond glass to coated substrates without priming, featuring silanol condensation capabilities, heat, and light stabilizers for enhanced durability and rapid curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer is applied to coated substrates before adhesive application, then adhesion strength to coated substrates is improved, but assembly complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the primer step from the bonding process by formulating an adhesive composition that directly bonds to coated substrates without requiring a separate primer layer. The adhesive contains silane functional groups that chemically interact with the coated surface, providing the necessary adhesion strength without the additional primer application step.
Solution Approach 2:
The patent combines the functions of the primer and adhesive into a single adhesive composition. The adhesive formulation integrates the adhesion-promoting properties traditionally provided by primers with the bonding functionality, merging two separate steps into one application while maintaining or improving adhesion strength.
2Strength
If a primer is applied to coated substrates before adhesive application, then adhesion strength to coated substrates is improved, but assembly time and cost increase
Solution Approach 1:
The patent removes the primer application step from the assembly process, eliminating the time required for primer application and drying. The adhesive composition is formulated to provide adequate adhesion strength directly to coated substrates, reducing total assembly time while maintaining bond quality.
Solution Approach 2:
The adhesive is pre-formulated with silane functional groups and other adhesion-promoting components that are activated upon contact with the coated substrate. This preliminary preparation of the adhesive allows it to immediately bond to the coated surface without requiring a separate primer step, thereby reducing assembly time.
3Strength
If traditional adhesives are used to bond to acid-resistant paints, then adhesion is insufficient, but using primers increases process complexity
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive formulation by incorporating silane functional groups, titanates, zirconates, and organic acids. These compositional changes enable the adhesive to chemically interact with acid-resistant paint surfaces, providing sufficient adhesion strength without requiring a primer layer.
Solution Approach 2:
The adhesive is formulated as a composite material containing multiple functional components: silane-functional polymers for chemical bonding, titanates and zirconates for enhanced adhesion to coated surfaces, and organic acids to promote bonding to acid-resistant paints. This composite formulation provides broad-spectrum adhesion capability to various coated substrates including acid-resistant paints.
4Productivity
If adhesive cures rapidly upon application, then productivity is improved, but stability during storage and transport deteriorates
Solution Approach 1:
The patent creates a dynamic system where the adhesive remains stable and non-curing during storage and transport, then rapidly cures upon application to the substrate. This is achieved through a two-component system or through controlled moisture-triggered curing, allowing the adhesive to adapt its state from stable (during storage) to reactive (during application), thereby resolving the contradiction between storage stability and cure speed.
Solution Approach 2:
The adhesive is pre-prepared in a stable, non-curing state with all necessary reactive components present but inactive. Upon application to the substrate, the curing reaction is triggered by exposure to moisture or other environmental conditions, providing rapid cure without compromising storage stability. This preliminary preparation allows the adhesive to maintain stability until the moment of application.
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 adhesive composition achieves strong adhesion, rapid curing, and long-term durability on unprimed surfaces, reducing assembly time and costs by eliminating the need for primers and maintaining bond integrity under harsh conditions.
Implementation Method 1
one or more polymers having a flexible backbone and silane moieties capable of silanol condensation
Implementation Method 2
one or more catalysts for the reaction of silane moieties with active hydrogen containing compounds
Implementation Method 3
one or more hydrophobic silanes having one or more hydrocarbyloxy groups and one or more hydrocarbyl groups
Data Source
AI summary
The invention is an adhesive composition comprising one or more polymers having a flexible backbone and silane moieties capable of silanol condensation; one or more hydrophobic silanes having one or more hydrocarbyloxy groups and one or more hydrocarbyl groups; one or more catalysts for the reaction of silane moieties with active hydrogen containing compounds. Preferably, the adhesive composition further comprises one or more heat stabilizers and/or light stabilizers. In another embodiment, the invention is a method of bonding a window to a coated substrate, such as a window in a vehicle, which comprises applying to the window or the coated substrate an adhesive as described; contacting the window with the coated substrate wherein the adhesive is located between the window and the substrate; and allowing the adhesive to cure.