Acetoacetate Urethane Adhesive for Structural Bonding

The patent combines silane modified polymers with reactive elastomers to create a composite adhesive system. This composite approach allows the adhesive to benefit from the low toxicity of silane polymers while gaining the enhanced mechanical properties and elasticity from the elastomeric component, thereby resolving the contradiction between toxicological safety and mechanical performance.

The patent modifies the chemical composition parameters of the adhesive by incorporating specific elastomeric components with defined molecular weights and functionality. This parameter change enables the adhesive to achieve both low toxicity and high mechanical strength, transforming the adhesive from a single-component system with limited properties to a multi-component system with optimized performance.

The patent extracts and removes the hazardous isocyanate component from the adhesive formulation while retaining the beneficial bonding performance through alternative chemistry. By using silane modified polymers and reactive elastomers that cure via moisture or catalyst-driven mechanisms rather than isocyanate reactions, the adhesive achieves high bonding strength without the safety risks associated with isocyanates.

The patent introduces silane modified polymers as intermediary substances that enable crosslinking and bond formation without requiring isocyanates. These silane polymers act as mediators that provide the necessary reactivity and mechanical properties traditionally achieved through isocyanate-based polyurethane chemistry, but through a safer chemical pathway.