Ionic Fluoride Mold Release Agent for Optical Polymer Demolding
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Solution Overview
Problem
Existing polymeric compositions for optical articles often exhibit undesirable adhesion to glass molds during the casting process, leading to surface defects and increased demolding time, necessitating the development of a composition with adequate refractive index, impact resistance, and ease of demolding.
Innovation Solution
An organic polymerizable composition incorporating ionic fluoride or its precursors, such as ammonium fluoride, potassium fluoride, and co-mold release agents like mono-alkyl phosphates, to facilitate partial demolding from glass molds, with ionic fluoride present in amounts ranging from 20 to 5000 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric compositions are used for optical articles, then optical qualities and impact resistance are improved, but adhesion to glass molds increases causing surface defects
Solution Approach 1:
The patent introduces a mold release agent as an intermediary substance between the polymeric composition and the glass mold. This release agent prevents direct adhesion between the polymer and mold surfaces, eliminating surface defects while allowing the polymer to maintain its optical qualities. The release agent acts as a mediating layer that facilitates easy demolding without compromising the final optical article quality.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polymeric formulation by incorporating specific mold release agents. This changes the surface properties and adhesion characteristics of the polymer, reducing its affinity for glass mold surfaces while maintaining bulk optical properties. The parameter change involves adjusting the chemical makeup to include release-promoting components.
2Strength
If polymeric compositions are used for optical articles, then impact resistance is improved, but demolding time increases due to strong mold adhesion
Solution Approach 1:
The mold release agent serves as an intermediary that reduces the bonding strength between the polymer and mold, enabling rapid demolding. This intermediary layer prevents strong adhesion forces from developing, allowing the molded article to be removed quickly without compromising the polymer's impact resistance properties.
Solution Approach 2:
The mold release agent is incorporated into the polymeric composition before molding, performing preliminary action to prevent adhesion issues before they occur. This preemptive measure ensures that demolding can proceed quickly without requiring additional time for mold preparation or forced removal of stuck articles.
3Manufacturing precision
If external mold release agents are used to reduce adhesion, then surface defects are reduced, but process complexity and preparation time increase
Solution Approach 1:
The patent combines the mold release agent with the polymeric composition itself, merging two previously separate functions into one integrated material. Instead of applying external release agents to the mold separately, the release functionality is built into the polymer formulation, simplifying the overall process and reducing preparation steps.
Solution Approach 2:
The polymeric composition becomes self-sufficient by containing its own mold release properties internally. The composition self-manages the demolding function without requiring external intervention or separate mold preparation steps, making the process more efficient and less complex.
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 effectively reduces mold adhesion, enabling easy demolding and reuse of glass molds while maintaining optical quality and impact resistance, thus addressing the challenges of surface defects and demolding time.
Implementation Method 1
many of the recently developed polymeric compositions used for this purpose can have an undesirable adhesion to the interior of the glass molds during the casting process
Data Source
AI summary
The present invention is directed to an organic polymerizable composition for producing a moided polymeric article. The composition includes a mold release agent of ionic fluoride and/or ionic fluoride precursor present in an amount sufficient to effect at least partial demolding of the polymeric article from a mold. Moided articles also are provided.