Acrylic Composition Low-Temperature Flexibility Adhesion Control
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Solution Overview
Problem
Acrylic resins exhibit poor flexibility at low temperatures and strong adhesion at room temperature, making them unsuitable for use in optical components like light guiding plates.
Innovation Solution
An acrylic composition containing long-chain di(meth)acrylate and mono(meth)acrylate monomers with specific molecular weights and structures, which are polymerized to achieve a glass-transformation temperature of 40°C or less, resulting in a formed body with excellent low-temperature flexibility and reduced room-temperature adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical resin composition with high-molecular-weight crosslinking agent is used to achieve excellent flexibility at low temperature, then flexibility at low temperature is improved, but adhesion at room temperature becomes too strong for optical component use
Solution Approach 1:
The patent changes the crosslinking agent parameters by using long-chain di(meth)acrylate with molecular weight of 500-5000, which is lower than conventional high-molecular-weight crosslinking agents. This parameter change reduces the adhesion strength to appropriate levels while maintaining low temperature flexibility. The specific molecular weight range controls the balance between flexibility and adhesion properties.
Solution Approach 2:
The patent applies local quality by having different monomer components serve different functions: component (A) provides base polymer structure, component (B) contributes to flexibility, and component (C) provides controlled crosslinking. This functional differentiation allows the material to achieve flexibility at low temperature while suppressing excessive adhesion at room temperature through the specific role of the long-chain di(meth)acrylate.
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 formed body demonstrates excellent flexibility at low temperatures and suppressed adhesion at room temperature, making it suitable for various optical components, including light guides and key sheets for mobile telephones.
Implementation Method 1
an acrylic composition, which contains long-chain di(meth)acrylate (A) represented by Formula (1) and mono(meth)acrylate (B), and the glass-transformation temperature (TgDMS) of a polymer of the acrylic composition determined by using the following method is 40°C or less
Data Source
AI summary
An acrylic composition, which has excellent flexibility at low temperature and can form a formed body whose adhesion at room temperature is suppressed, the formed body of the acrylic composition, a key sheet of a mobile telephone, and a light guide obtained from the formed body are provided. The acrylic composition contains specific long chain di(meth)acrylate (A) and mono(meth)acrylate (B), and the glass-transformation temperature (TgDMS) of the polymer of the acrylic composition is 40°C or less. The formed body is obtained by polymerization of the acrylic composition, and the key sheet of the mobile telephone and the light guide are obtained from the formed body.