Curable Composition Balancing Oxygen Absorption and Storage Stability
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Solution Overview
Problem
Curable compositions containing unsaturated double bond-containing compounds face issues with reduced storage stability due to oxygen inhibition and delayed curing, despite enhanced reactivity from oxygen absorbing properties.
Innovation Solution
A curable composition comprising a compound with a specific structure and a base in particular amounts, allowing for enhanced storage stability and reactivity by balancing ionic and radical reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an unsaturated double bond-containing compound having oxygen absorbing properties is used to reduce oxygen concentration and enhance reactivity, then the reactivity of the composition is improved, but the storage stability is reduced
Solution Approach 1:
The patent segments the oxygen absorption function into two distinct components: compound (A) which absorbs oxygen through radical reactions, and base (B) which suppresses premature polymerization through ionic reactions. This segmentation allows each component to perform its specific function without causing the stability problems that arise when using oxygen-absorbing compounds alone.
Solution Approach 2:
The patent creates a composite curable composition containing both compound (A) with oxygen absorbing properties and base (B) with specific basicity. This composite approach combines the reactivity enhancement from oxygen absorption with the stability provided by the base, resolving the contradiction between improved reactivity and maintained storage stability.
2Speed
If oxygen absorber is added to the resin to prevent oxygen inhibition during curing, then the curing speed is improved, but the composition becomes less stable during storage
Solution Approach 1:
The patent changes the chemical parameters of the oxygen absorption mechanism by using compound (A) that absorbs oxygen through radical reactions rather than conventional oxygen absorbers. Additionally, the presence of base (B) changes the reaction environment, suppressing premature polymerization while allowing rapid oxygen absorption during curing, thus achieving both fast curing and storage stability.
Solution Approach 2:
Base (B) acts as an intermediary that mediates between the oxygen absorption activity of compound (A) and the polymerization reaction. It suppresses premature polymerization during storage while allowing the oxygen absorption and curing reactions to proceed rapidly when needed, thus resolving the contradiction between curing speed and storage stability.
3Productivity
If the concentration of oxygen in the composition is reduced to enhance reactivity, then the polymerization reaction is accelerated, but the composition loses stability
Solution Approach 1:
The patent converts the harmful effect of oxygen (which causes inhibition) into a beneficial effect by using compound (A) to absorb oxygen through radical reactions. The base (B) ensures that this oxygen absorption process occurs without causing premature polymerization, thus converting the potential harm of oxygen into the benefit of enhanced reactivity while maintaining stability.
Solution Approach 2:
The patent applies different chemical properties to different components: compound (A) is designed with specific radical reaction properties for oxygen absorption, while base (B) provides ionic reaction properties for suppressing premature polymerization. This local differentiation of chemical qualities allows the system to achieve both rapid polymerization and storage stability.
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 maintains excellent storage stability while ensuring high reactivity after storage, producing a cured product with improved properties.
Implementation Method 1
the use of an unsaturated double bond-containing compound having oxygen absorbing properties, as described in patent document 5, can reduce the concentration of oxygen in the composition
Implementation Method 2
a radical polymerizable monomer... can be polymerized and cured through the generation of a radical from a polymerization initiator
Implementation Method 3
allowing for enhanced storage stability and reactivity by balancing ionic and radical reactions
Implementation Method 4
the monomer is cured generally in an air atmosphere. Upon the curing, the polymerization reaction is likely to be inhibited by oxygen in the air
Implementation Method 5
a radical polymerizable monomer, such as a (meth)acrylic ester, for use in a coating material, a paint, a 3D modeling material, etc. can be polymerized and cured
Data Source
AI summary
A curable composition includes, per 100 parts by mass of a curable compound, 0.1 to 10.0 parts by mass of a compound (A) including a structure represented by the following general formula (I), and 0.01 to 10.0 parts by mass of a base (B):where X represents a chalcogen atom, R1 and R2 each independently represent an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, and R3 and R4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group.