Polymerizable Composition Molded Body Releasability Turbidity
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Solution Overview
Problem
Existing polymerizable compositions for plastic lenses, particularly those using epoxy resin and acid anhydride, face issues with insufficient releasability and resin turbidity when using internal release agents, limiting their effectiveness in mold release and optical material applications.
Innovation Solution
A polymerizable composition incorporating a polyether-modified silicone mixture as an internal release agent, specifically designed to enhance releasability and reduce turbidity, comprising a combination of polyether-modified silicone compounds and selected polymerization reactive compounds such as polyiso(thio)cyanate, poly(thio)epoxy, and poly(thi)ol compounds, optimized for use in cast polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an internal release agent is added to improve releasability from mold, then releasability is improved, but resin turbidity occurs
Solution Approach 1:
The patent changes the chemical parameters of the release agent by selecting specific polyether-modified silicone compounds with controlled molecular weights (b1: 1,000-100,000, b2: 100-10,000) and polyether content ratios (30-90% for b1, 70-100% for b2). This parameter optimization allows the release agent to function effectively without causing resin turbidity, resolving the contradiction between releasability improvement and transparency maintenance.
Solution Approach 2:
The patent uses a composite release agent system comprising two different polyether-modified silicone compounds (b1 and b2) with distinct molecular weight ranges and polyether content characteristics. This composite approach synergistically improves releasability while maintaining resin transparency, as the combination of different silicone compounds provides both release functionality and optical clarity.
2Ease of manufacture
If conventional release agents are used, then releasability is partially improved, but sufficient releasability is not achieved
Solution Approach 1:
The patent optimizes the molecular weight parameters and polyether content ratios of the silicone compounds to achieve sufficient releasability. Specifically, compound b1 has molecular weight 1,000-100,000 with 30-90% polyether content, while compound b2 has molecular weight 100-10,000 with 70-100% polyether content. These parameter ranges ensure adequate release from glass molds without compromising optical properties.
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 improved releasability and transparency of molded products, resulting in high-quality optical materials with excellent appearance and performance, suitable for applications like plastic lenses.
Implementation Method 1
an internal release agent (B) including a polyether-modified silicone compound (b1) and a polyether-modified silicone compound (b2)
Implementation Method 2
a polymerization reactive compound (A) is one or more compounds selected from a polyiso(thio)cyanate compound, a poly(thio)epoxy compound, a polyoxetanyl compound, a polythietanyl compound, an alkyne compound, a poly(thi)ol compound, a polyamine compound, an acid anhydride, and a polycarboxylic acid compound
Data Source
AI summary
A polymerizable composition of the present invention includes a polymerization reactive compound (A), and an internal release agent (B) including a polyether-modified silicone compound (b1) represented by General Formula (1) and a polyether-modified silicone compound (b2) represented by General Formula (2), in which the polymerization reactive compound (A) is one or more compounds selected from a polyiso(thio)cyanate compound, a poly(thio)epoxy compound, a polyoxetanyl compound, a polythietanyl compound, an alkyne compound, a poly(thi)ol compound, a polyamine compound, an acid anhydride, or a polycarboxylic acid compound.