Phosphodiester Internal Release Agent for Plastic Lens Transparency
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Solution Overview
Problem
In the production of plastic lenses by cast polymerization, the use of traditional internal release agents often results in white turbidity due to phosphoric ester micelle formation, leading to a trade-off between transparency and releasability, where reducing the agent's amount can cause mold breakage or cracks in the resin.
Innovation Solution
Employing a phosphodiester compound with a poly(oxyalkylene)alkyl ether group and an alkyl group, represented by a specific general formula, as an internal release agent, which suppresses white turbidity and enhances both the transparency and releasability of the molded product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphoric ester is used as an internal release agent, then releasability is improved, but white turbidity occurs due to micelle formation
Solution Approach 1:
The patent changes the chemical structure parameter of the release agent from phosphoric ester to phosphodiester compound, specifically introducing a poly(oxyalkylene)alkyl ether group. This structural parameter change eliminates micelle formation while maintaining release effectiveness, resolving the contradiction between releasability and transparency.
Solution Approach 2:
The patent uses a composite molecular structure combining phosphodiester backbone with poly(oxyalkylene)alkyl ether side chains. This composite structure provides both the release agent functionality and the transparency requirement by preventing micelle formation while ensuring adequate releasability.
2Object-affected harmful factors
If addition amount of internal release agent is reduced to suppress white turbidity, then transparency is improved, but releasability becomes insufficient
Solution Approach 1:
The patent changes the chemical structure parameter from phosphoric ester to phosphodiester compound with poly(oxyalkylene)alkyl ether group. This structural change increases the efficiency of the release agent, allowing sufficient releasability at lower addition amounts while suppressing white turbidity and maintaining transparency.
3Reliability
If insufficient releasability occurs, then glass mold breaks or cracks form in resin molded product, but increasing release agent amount causes white turbidity
Solution Approach 1:
The patent changes the chemical structure to phosphodiester compound with poly(oxyalkylene)alkyl ether group, which fundamentally alters the release mechanism. This parameter change enables sufficient releasability at lower concentrations without causing micelle formation, thereby preventing both mold breakage and white turbidity simultaneously.
Data Source
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AI summary
An internal release agent of the present invention includes at least one phosphodiester represented by the following general formula (1). (In the formula, R1 and R2 independently represent a hydrocarbon group having 1 to 30 carbon atoms, which is optionally substituted with at least one hydroxyl group, and R3 represents an alkylene group having 2 to 4 carbon atoms. A plurality of R3's may be the same as or different from each other. M represents a hydrogen atom, an ammonium ion, an alkali metal ion, or a monovalent/divalent alkali earth metal ion, and n is an integer of 1 to 60.)