Cationic Curable Composition for Low Viscosity and Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cationic curable compositions face issues with high viscosity, inadequate adhesion to substrates, and insufficient glass cleaner and water resistance, particularly in inkjet and gravure inks and hard coating materials, which limit their application in coatings and printing technologies.
Innovation Solution
A cationic curable composition comprising a phenol derivative with 3 or more aromatic rings, where hydrogen atoms of phenolic hydroxyl groups are substituted with polymerizable functional groups, combined with a cationic polymerizable compound and a photo- and/or thermo-cationic initiator, along with a reactive organosilicon compound, to achieve low viscosity, rapid photocuring, and enhanced adhesion and resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cationic curable composition is used to achieve excellent surface curability and adhesion, then the curing quality improves, but the viscosity becomes too high for practical application
Solution Approach 1:
The patent combines multiple cationic polymerizable compounds with different molecular structures and reactivities (epoxy compound, vinyl ether compound, and cyclic carbonate compound) to create a composite curable composition. This composite approach allows the system to achieve excellent curing quality through synergistic effects while the varied molecular structures prevent excessive viscosity by disrupting intermolecular interactions.
Solution Approach 2:
The patent assigns different functional roles to specific compound classes within the composition. The epoxy compound provides adhesion and structural integrity, the vinyl ether compound contributes to low viscosity and fast curing, and the cyclic carbonate compound enhances crosslinking density. This local functional differentiation allows each component to optimize its contribution without compromising overall viscosity.
2Strength
If a polyalkoxysilane is synthesized before preparing the photosensitive composition, then abrasion resistance improves, but the composition requires solvent mixing which compromises curability
Solution Approach 1:
The patent extracts the solvent from the system by using a non-solvent polyalkoxysilane that can be directly blended with the cationic curable composition without requiring solvent mixing. The polyalkoxysilane particles are incorporated as solid dispersions, eliminating the curability issues associated with solvent-based systems while maintaining abrasion resistance through the hard silica network formed upon curing.
Solution Approach 2:
The patent uses a silane coupling agent as an intermediary between the polyalkoxysilane particles and the cationic curable matrix. The coupling agent contains both hydrolyzable alkoxy groups that bond to silica and organic functional groups that participate in cationic polymerization, creating strong interfacial adhesion and enabling stress transfer without compromising curability.
3Stability of the object's composition
If a non-solvent silane compound is used to avoid solvent issues, then composition stability improves, but the cured film shows insufficient cleaner resistance and water resistance
Solution Approach 1:
The patent creates a composite cured film structure where the polyalkoxysilane forms a dense, crosslinked silica network that provides excellent barrier properties against water and cleaners. The silane groups undergo condensation reactions to form Si-O-Si bonds, creating a hydrophobic, chemically resistant matrix that complements the organic polymer network, achieving both composition stability and resistance to harmful factors.
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating polyalkoxysilane with specific alkyl chain lengths and crosslinking densities. By adjusting the silane content and molecular structure, the cured film achieves optimized hydrophobicity and chemical resistance while maintaining composition stability during storage and application.
4Force
If a phenol compound with carbon-carbon unsaturated bond is used to reduce viscosity, then fluidity improves, but the cured film shows insufficient adhesion and cleaner resistance
Solution Approach 1:
The patent replaces the problematic phenol compound with a composite system of multiple cationic polymerizable compounds. The vinyl ether compound provides low viscosity and fluidity through its flexible ether linkages and lower molecular weight, while the epoxy and cyclic carbonate compounds contribute adhesion and chemical resistance through their polar functional groups and crosslinking capabilities, achieving a balanced performance profile.
Solution Approach 2:
The patent changes the molecular weight and functional group parameters of the polymerizable compounds to optimize the viscosity-resistance trade-off. The vinyl ether compound with lower molecular weight reduces viscosity, while the epoxy and cyclic carbonate compounds with polar functional groups enhance adhesion and cleaner resistance through strong substrate bonding and crosslinking.
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 exhibits low viscosity, excellent adhesion to substrates, and improved glass cleaner and water resistance, enabling high-speed curing and broad application in inkjet inks, gravure inks, and hard coatings without the need for extensive heating.
Implementation Method 1
a photocationic initiator which initiates polymerization of the cationic polymerizable compound upon light irradiation
Implementation Method 2
a thermo-cationic initiator which initiates polymerization of the cationic polymerizable compound upon heating
Data Source
AI summary
An object of the present invention is to provide a cationic curable composition which has low viscosity, can be rapidly photo-cured even in the air, has good adhesion to a substrate such as glass or resin, and is excellent in glass cleaner resistance and water resistance; an ink jet ink, a gravure ink and a hard coating material which comprise the composition; and cured products thereof. A cationic curable composition comprising: (A) 1 to 100 parts by weight of a phenol derivative having 3 or more aromatic rings per molecule, wherein the aromatic ring has a structure in which some or all of hydrogen atoms of phenolic hydroxyl groups of the aromatic ring are substituted by polymerizable functional groups; (B) 1 to 500 parts by weight of a cationic polymerizable compound; and (C) 0.05 to 20 parts by weight of a photo- and/or thermo-cationic initiator is provided.