Optical Fiber Coating Composition with Photosensitizer for Fast Cure
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Solution Overview
Problem
The current manufacturing of optical fibers is limited by the slow speed of forming coatings, which restricts the draw speed and efficiency of fiber production, as the primary and secondary coatings require time to cure, and there is a need for faster cure speeds to enhance processing efficiency.
Innovation Solution
A curable coating composition comprising a diisocyanate compound, a hydroxy (meth)acrylate compound, and a polyol compound in specific molar ratios, combined with a photosensitizer (DETX) and a photoinitiator ((2,4,6 trimethylbenzoyl)diphenyl phosphine oxide), which accelerates the curing reaction when exposed to radiation, allowing for faster formation of high-tensile-toughness coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the draw speed is increased to improve manufacturing efficiency, then the productivity increases, but the coating cure speed becomes insufficient leading to defective coatings
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by incorporating specific photoinitiators and photosensitizers that accelerate the curing reaction kinetics, enabling the coating to cure at higher draw speeds without compromising coating quality
Solution Approach 2:
The patent introduces photosensitizers as intermediary substances that mediate between the UV radiation and the photoinitiator, enhancing the photopolymerization process and enabling faster cure speeds required for high-productivity manufacturing
2Speed
If the coating composition is optimized for fast curing, then the cure speed increases, but the tensile toughness of the coating may be compromised
Solution Approach 1:
The patent creates a composite coating composition that integrates multiple functional components - photoinitiators for rapid curing, photosensitizers for enhanced reaction efficiency, and carefully selected monomers/oligomers that provide both fast cure kinetics and high tensile toughness, achieving simultaneous optimization of both properties
Solution Approach 2:
The patent optimizes the local chemical environment within the coating by controlling the distribution and concentration of photoinitiators, photosensitizers, and polymer components, ensuring that regions with different requirements (cure speed vs. mechanical properties) are satisfied through localized compositional tuning
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 rapid curing speeds while maintaining high tensile toughness, enabling faster coating formation and improved manufacturing efficiency without compromising mechanical properties, thus addressing the limitations of existing coating technologies.
Implementation Method 1
The curable coating composition includes a photoinitiator and a photosensitizer, and curing is accomplished with radiation in the UV, visible, or infrared portion of the electromagnetic spectrum
Implementation Method 2
The photosensitizer absorbs radiation energy to transfer to the photoinitiator, enabling the photopolymerization reaction to proceed at accelerated rates
Data Source
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AI summary
The invention relates to a coating composition that exhibits high cure speed is described. The coating composition includes one or more monomers, one or more oligomers, and a photoinitiator. The coating composition further includes a photosensitizer that acts in cooperation with a photoinitiator to increase cure speed. The invention also relates to method for coating an optical fiber with the coating composition and method for providing a coating composition.