One-Part Adhesive Composition for Polymer Bonding
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Solution Overview
Problem
Existing adhesive compositions for bonding polymeric substrates, such as rubber and metal, face challenges including complexity, toxicity, and inconsistent curing across various substrates and process parameters, limiting their versatility and durability.
Innovation Solution
A composition comprising alkoxy silane moieties and aromatic nitroso or aromatic nitroso precursors, applied with a carrier containing at least 0.1% water, which facilitates hydrolysis and forms strong bonds with polymeric substrates like rubber and metal surfaces, enabling a one-part adhesive system for efficient bonding in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional two-step rubber-to-metal bonding systems (primer + adhesive) are used, then bonding strength can be achieved, but process complexity and application time increase
Solution Approach 1:
The patent combines the primer and adhesive into a single integrated adhesive composition containing silane coupling agents, aromatic nitroso compounds, and rubber materials. This single composition performs both the priming function (surface treatment and bonding preparation) and the adhesive function (bonding rubber to metal), eliminating the need for separate primer application and drying steps while maintaining strong bonding performance
Solution Approach 2:
The adhesive composition is designed to perform multiple functions simultaneously: it acts as a surface primer, a bonding agent, and a vulcanization promoter. The silane coupling agents provide surface modification and bonding capabilities, while the aromatic nitroso compounds enable cross-linking with rubber, creating a universal composition that handles both metal surface preparation and rubber bonding in one application
2Reliability
If conventional adhesive compositions are used, then bonding can be achieved, but toxicity and environmental hazards increase
Solution Approach 1:
The patent replaces toxic conventional chemicals with less hazardous alternatives. Specifically, it substitutes harmful solvents and cross-linking agents with water-based or solvent-free formulations, and uses aromatic nitroso compounds that decompose into harmless byproducts. The silane coupling agents are used at optimized concentrations to achieve maximum bonding efficiency with minimal chemical residue, reducing overall toxicity while maintaining bonding reliability
3Manufacturing precision
If multi-step bonding processes are used, then bond consistency can be improved, but manufacturing time and productivity decrease
Solution Approach 1:
The adhesive composition contains pre-reacted silane coupling agents that are already hydrolyzed and ready to bond upon application. The aromatic nitroso compounds are pre-formulated to provide immediate cross-linking activity when exposed to moisture or heat during vulcanization. This preliminary preparation of reactive components within the single composition enables consistent bonding performance without requiring multiple sequential processing steps, thereby maintaining bond consistency while accelerating production
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 provides improved bond strengths and reduced toxicity, allowing for consistent bonding across different substrates and processes, including those with diene and allylic functionality, and can be applied to unvulcanized rubber substrates, enhancing the durability and ease of application.
Implementation Method 1
a composition comprising: (i) a compound comprising: (a) at least one alkoxy silane moiety; and (b) at least one moiety selected from an aromatic nitroso or an aromatic nitroso precursor and combinations thereof; and (ii) a carrier for the compound, the carrier comprising at least 0.1% water
Data Source
AI summary
Compositions having a compound comprising at least one alkoxy silane moiety, and at least one moiety selected from a nitrosoaromatic or a nitrosoaromatic precursor and combinations thereof; and an aqueous or water containing carrier medium are provided for use in polymer bonding. The water may allow for substantial hydrolysis of the compound. Suitable polymers may have diene or allylic functionality within the polymer chain, for example an elastomer such as a natural or synthetic rubber. The polymers may be bonded to metals or substrates with hydro xylated surfaces such as glass. The nitrosobenzene precursor may be at least one of a quinone dioxime or a quinone oxime.