Latent Catalyst Composition for Extended Pot Life
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Solution Overview
Problem
Catalysts used in coating compositions increase the reaction rate between reactive materials but decrease the pot life, making it desirable to have catalysts that enhance reaction rates while maintaining an extended stability period.
Innovation Solution
A composition comprising a reactive material and a latent catalyst formed from a ligand and a metal compound, where the ligand is derived from specific chemical structures, allowing the catalyst to be activated by irradiation to initiate reactions without premature curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a catalyst is added to increase the reaction rate between reactive materials, then the reaction rate increases, but the pot life decreases
Solution Approach 1:
The patent applies preliminary action by incorporating the catalyst into the coating composition in advance, but keeping it in a latent or dormant state that does not immediately activate. The catalyst is pre-positioned within the composition structure, ready to become active when specific conditions (such as exposure to moisture, heat, or chemical triggers) are encountered during or after application, thus extending pot life while ensuring subsequent reaction rate enhancement.
Solution Approach 2:
The patent employs dynamics by designing a catalyst system that transitions from an inactive to an active state. The catalyst's activity is not fixed but dynamically adjusted based on environmental conditions or compositional changes. This dynamic behavior allows the catalyst to remain dormant during storage and mixing (preserving pot life) and become active when needed (enhancing reaction rate), creating a time-dependent functional transformation.
2Speed
If a catalyst is used to accelerate the reaction between reactive materials, then the curing speed increases, but the stability period of the mixed composition decreases
Solution Approach 1:
The catalyst is incorporated into the composition in advance but maintained in a latent form that does not immediately initiate rapid curing. The preliminary incorporation ensures the catalyst is present and ready, while the latent state prevents premature activation, thus maintaining compositional stability during storage and application while enabling fast curing when activation conditions are met.
Solution Approach 2:
The patent applies parameter changes by modifying the catalyst's physical or chemical state to control its activity. The catalyst exists in different states (latent vs. active) with distinct parameters such as solubility, reactivity, or molecular configuration. By controlling these parameters through environmental triggers or compositional adjustments, the system achieves both long stability period (when catalyst is in low-activity state) and fast curing speed (when catalyst transitions to high-activity state).
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 composition achieves increased reaction rates upon irradiation while maintaining an extended pot life, allowing for stable storage and on-demand curing.
Implementation Method 1
A latent catalyst comprising a reaction product formed from components comprising: a ligand; and a metal compound sufficient to catalyze the reactive material
Implementation Method 2
The composition is irradiated with actinic radiation such that the ligand is disassociated from the reaction product
Implementation Method 3
one or more cationic polymerizable components
Data Source
AI summary
A compound capable of coordinating with a metal includes a chemical structure as shown in claim 1, in which: EPD represents a group having an electron pair donor atom; B and B′ are each independently an aryl group, a heteroaryl group, an alkenyl group, or alkynyl group, or B and B′ form a spirocyclic group; and R1, R2, and R3 are selected from various substituents.