Composite Particles for Organoborane Storage Stability
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Solution Overview
Problem
Organoborane-amine complexes used in dental adhesives have stability issues when stored with (meth)acrylic monomers, leading to premature polymerization and inadequate adhesion to biological hard tissues.
Innovation Solution
Composite particles containing an organoborane-Lewis base complex, either embedded within or adsorbed onto organic or inorganic particles, which provide enhanced storage stability and improved adhesion by controlled release of the organoborane as a polymerization initiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organoborane-amine complexes are used as polymerization initiators in dental adhesives, then adhesion performance to tooth structures is improved, but storage stability deteriorates due to premature dissociation and polymerization
Solution Approach 1:
The invention divides the initiator system into two separate components: a stable organoborane-amine complex and a decomplexing agent. This segmentation prevents premature dissociation and polymerization during storage, as the complex remains stable until the decomplexing agent is introduced at the time of use.
Solution Approach 2:
The invention introduces a decomplexing agent as an intermediary substance that selectively interacts with the organoborane-amine complex at the time of use. This intermediary triggers controlled dissociation of the complex to release the active organoborane initiator, preventing premature reaction during storage while ensuring reliable initiation when needed.
2Productivity
If organoborane-amine complexes are used to initiate polymerization, then polymerization function is achieved, but premature polymerization occurs during storage due to complex dissociation
Solution Approach 1:
The invention prepares the organoborane-amine complex in advance as a stable, non-active form. This preliminary preparation allows the system to be stored for extended periods without premature polymerization, as the complex does not dissociate on its own during storage.
Solution Approach 2:
The invention creates a dynamic system where the organoborane-amine complex transitions from a stable, inactive state during storage to an active state upon contact with the decomplexing agent. This dynamic behavior ensures polymerization occurs only when intended, preventing time loss during storage while maintaining productivity when needed.
3Reliability
If organoborane compounds are used as polymerization initiators, then adhesion to tooth structures is achieved, but ignitability and smoke generation increase
Solution Approach 1:
The invention uses an inorganic filler as an intermediary carrier that physically isolates the organoborane-amine complex from flammable substances. This carrier prevents direct contact between the organoborane compound and combustibles, eliminating the ignitability hazard while preserving the adhesion function.
Solution Approach 2:
The invention creates a composite material system combining the organoborane-amine complex with an inorganic filler. This composite structure maintains the beneficial adhesion properties of the organoborane compound while the inorganic filler component suppresses ignitability and smoke generation, resolving the safety issue.
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 composite particles ensure long-term storage stability and high adhesion to biological hard tissues, making them suitable for medical and dental applications as adhesives or fillers.
Implementation Method 1
an organoborane-Lewis base complex (A) contained in the particles or adsorbed on the particles
Data Source
AI summary
The present invention improves the long-term storage stability of an organoborane-Lewis base complex. First composite particles of the present invention include particles of an organic polymer (B), and an organoborane-Lewis base complex (A) contained in the particles. Second composite particles of the present invention include particles of an inorganic compound (B′), and an organoborane-Lewis base complex (A) adsorbed on the particles.