Two-Part Cyanoacrylate Composition With Visual Cure Indication
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Solution Overview
Problem
Existing cyanoacrylate adhesives face challenges in curing through volume in non-zero gap situations, leading to uncertainty for end users about the curing status, which results in reduced productivity due to manual checks and potential uncured material spillage.
Innovation Solution
A two-part curable composition comprising cyanoacrylate monomers, nucleophilic initiators, and a color changing indicator that transitions from a colored state to colorless upon curing, providing visual confirmation of cure within minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-part curable composition is used to improve cure through volume, then curing capability in non-zero gap situations is improved, but the lack of visual indication for curing status increases loss of time due to manual checking and waiting
Solution Approach 1:
The patent incorporates a color changing indicator that transitions from a colored state to colorless upon curing of the cyanoacrylate adhesive. This visual indicator allows end users to immediately assess whether the adhesive has cured properly without manual testing, eliminating unnecessary waiting time and preventing productivity loss while maintaining reliable cure through volume capability
2Reliability
If manual curing checks are performed to ensure proper curing, then curing status is determined, but productivity is reduced due to additional waiting time and potential uncured material spillage
Solution Approach 1:
The color changing indicator enables the adhesive system to self-indicate its curing status automatically. Users no longer need to perform manual curing checks or wait indefinitely to confirm proper curing - the visual color change provides immediate, reliable information about curing completion, allowing them to proceed with assembly or handling without unnecessary delays or productivity loss
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
Enables fast and clear indication of curing, allowing users to assess completion without additional waiting time, thereby increasing productivity and preventing uncured material issues.
Implementation Method 1
a color changing indicator in part A and/or part B; said color changing indicator being a coloring material that changes color between uncured state (after mixing of parts A and B of the two-part curable composition, in particular after 60 s of the mixing of parts A and B) and cured state of said two-part curable composition
Implementation Method 2
a nucleophilic initiator; said nucleophilic initiator being selected from the group consisting of: organic bases, quaternary ammonium salts, metal salts of carboxylic acids, and mixtures thereof
Data Source
AI summary
The present invention concerns a two-part curable composition comprising: a) a first part (part A) comprising:—at least one cyanoacrylate monomer; b) a second part (part B) comprising:—a nucleophilic initiator;—a plasticizer; said two-part curable composition further comprising a color changing indicator in part A and/or part B; said nucleophilic initiator being selected from the group consisting of: organic bases, quaternary ammonium salts, metal salts of carboxylic acids, and mixtures thereof. The present invention also concerns its use, in particular for determining cure of said composition.