Acylgermane Photoinitiators for Optical Fiber Coating Cure Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current curable coating compositions for optical fibers have insufficient cure speeds, limiting the ability to increase draw speeds in optical fiber manufacturing, and existing strategies such as increasing photoinitiator concentration are hindered by solubility limits and adverse effects on tensile properties.
Innovation Solution
The use of acylgermane photoinitiators in curable coating compositions, which include a radiation-curable monomer and an adhesion promoter like an alkoxysilane compound, to achieve faster cure speeds for both primary and secondary coatings, ensuring high tear strength and microbending performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the concentration of photoinitiator is increased to improve cure speed, then the cure speed increases, but the tensile properties deteriorate due to solubility limits and molecular weight reduction
Solution Approach 1:
The patent changes the chemical structure of the photoinitiator from traditional phosphine oxide to acylgermane type, which has different absorption characteristics and reactivity. This parameter change in the photoinitiator's molecular structure enables faster cure speeds without the adverse effects on tensile properties that occur with simply increasing photoinitiator concentration, as the acylgermane photoinitiators maintain better solubility and produce higher molecular weight coatings.
2Productivity
If additional curing lamps are added to increase cure speed, then the curing capacity improves, but the device complexity and cost increase
Solution Approach 1:
The patent changes the photoinitiator type to acylgermane, which has different light absorption characteristics and reactivity. This enables the existing curing lamp system to achieve higher cure speeds and capacities without adding more lamps, thereby avoiding increased device complexity and cost while still improving productivity.
3Productivity
If the draw speed is increased to improve productivity, then the manufacturing efficiency improves, but the cure quality deteriorates due to insufficient curing time
Solution Approach 1:
The patent uses acylgermane photoinitiators which have higher reactivity and different absorption characteristics compared to traditional photoinitiators. This enables the coating to cure sufficiently even at higher draw speeds, maintaining cure quality and reliability while improving manufacturing productivity through increased draw speed.
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 acylgermane photoinitiators enable faster cure speeds, improving the tensile properties and microbending performance of optical fiber coatings, allowing for higher draw speeds without compromising the mechanical integrity of the coatings.
Implementation Method 1
curing the coating compositions with light to induce photochemical reactions that convert the coating compositions to rigid coatings
Data Source
AI summary
The present disclosure provides coating compositions that can be cured at fast rates as well as coatings and cured products formed from the coating compositions. The coating compositions include an acylgermane photoinitiator that leads to fast cure speeds. The coating compositions include primary coating compositions and secondary coating compositions. The coating compositions can be cured to form primary and secondary coatings of optical fibers. The primary coatings feature low Young's modulus and high tear strength. The primary coatings provide good microbending performance and are resistant to defect formation during the fiber draw process and subsequent handling operations. The secondary coatings feature high Young's modulus and good puncture resistance.