Base-Releasing Copolymer Composition for Latent Heat-Triggered Curing
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Solution Overview
Problem
Conventional latent initiators for one-part curable resin compositions fail to simultaneously suppress the release of basic compounds at room temperature and rapidly release them under predetermined conditions, leading to issues with pot life and curing efficiency.
Innovation Solution
A base-releasing composition comprising a side-chain crystalline (meth)acrylate copolymer and a basic compound, where the basic compound is incorporated into the copolymer, allowing suppression of release at room temperature and rapid release upon heating, thereby enhancing the pot life and curing efficiency of the curable resin composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional latent initiator (wax-encapsulated basic compound) is used, then rapid release under predetermined conditions is achieved, but release suppression at room temperature is insufficient
Solution Approach 1:
The invention changes the physical state parameters of the basic compound by incorporating it into the crystalline regions of the side-chain crystalline polymer. The basic compound is held in a solid-state incorporated form at room temperature, suppressing release, but rapidly released when the polymer crystalline structure melts upon heating to the predetermined temperature (e.g., 60°C or higher).
Solution Approach 2:
The invention creates a composite latent initiator system where a basic compound (such as a metal alkoxide or organometallic compound) is incorporated into the crystalline structure of a side-chain crystalline polymer. This composite structure enables both room temperature stability and rapid release upon heating, combining the advantages of different material systems.
2Reliability
If an aliphatic or aromatic amine covalently bonded to side-chain crystalline acrylate copolymer is used, then release suppression at room temperature is achieved, but excess basic groups cause short pot life
Solution Approach 1:
The invention extracts the basic compound from covalent bonding and instead incorporates it into the crystalline regions of the polymer through non-covalent interactions. This allows the basic compound to be held stably at room temperature without excessive basic group activity, while still enabling rapid release when needed, thus extending pot life.
Solution Approach 2:
The invention changes the chemical state of the basic compound from covalently bonded (which creates excessive basic groups) to incorporated in crystalline regions (which provides stable containment without excess reactivity). This parameter change in the chemical state resolves the pot life issue while maintaining release suppression.
3Productivity
If a one-part curable resin composition is used to improve production efficiency, then curing speed at low temperature is improved, but release control of basic compound becomes difficult
Solution Approach 1:
The invention performs preliminary action by incorporating the basic compound into the side-chain crystalline polymer structure during resin composition preparation. This pre-incorporation ensures the basic compound remains stable and controlled at room temperature during storage and application, while being pre-positioned for rapid release when heated, thus maintaining both productivity and reliability.
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 a long pot life at room temperature while ensuring rapid curing under predetermined conditions, making it suitable for electronic component production by effectively managing the release of the basic compound.
Implementation Method 1
a side-chain crystalline (meth)acrylate copolymer comprising (i) repeating units each derived from an ester of a C8-C32 saturated, linear primary alcohol with acrylic acid or methacrylic acid
Implementation Method 2
when the base-releasing composition is heated to a temperature of 50° C. or higher in a medium, the Component (B) is released into the medium
Data Source
AI summary
A base-releasing composition which suppresses release of a basic compound at room temperature and rapidly releases the basic compound under predetermined conditions. The base-releasing composition includes (A) a side-chain crystalline (meth)acrylate copolymer includes (i) repeating units each derived from an ester of a C8-C32 saturated, linear primary alcohol with acrylic acid or methacrylic acid and (ii) repeating units each derived from acrylic acid or methacrylic acid, and (B) a basic compound. The amount of basic groups in the (B) basic compound is 0.01 to 1.00 mmol per 1 g of the base-releasing composition, and at least a portion of the Component (B) is included in the Component (A). A curable resin composition includes a specific 2-methylene-1,3-dicarbonyl compound in combination with the base-releasing composition.