Optical Fiber Coating Composition for Stable Modulus and Adhesion
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Solution Overview
Problem
The change in Young's modulus of optical fiber primary materials due to urethane oligomers with alkoxysilyl groups leads to deteriorated transmission characteristics.
Innovation Solution
A composition for forming a coating layer on optical fibers using a urethane (meth)acrylate oligomer with a specific structure, such as *—NH—CO—N(R1)—R2—SiR3n—(OR4)3-n, which includes a urethane (meth)acrylate oligomer with a (meth)acrylate group, photopolymerization initiator, and reactive diluent monomer, to maintain appropriate glass adhesion strength while minimizing changes in Young's modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a urethane oligomer comprising an alkoxysilyl group is blended into the primary material, then glass adhesion strength is improved, but the Young's modulus changes significantly causing deterioration of transmission characteristics
Solution Approach 1:
The patent changes the chemical structure parameters of the urethane oligomer by introducing specific alkoxysilyl group configurations (formula I with defined R1-R4 groups and n values). This structural modification allows the material to achieve both high glass adhesion strength and minimal Young's modulus change, resolving the contradiction between adhesion improvement and transmission characteristic maintenance.
Solution Approach 2:
The patent creates a composite resin composition by blending the specifically structured urethane oligomer (formula I) with other resin components. This composite approach enables the material to simultaneously achieve improved glass adhesion through the alkoxysilyl group while maintaining appropriate Young's modulus to preserve transmission characteristics.
2Object-affected harmful factors
If the Young's modulus of the primary material is kept low for flexibility, then the glass fiber is protected from bending, but the structural rigidity is reduced
Solution Approach 1:
The patent optimizes the Young's modulus parameter of the primary coating material by carefully controlling the composition and structure of the urethane oligomer. The modified urethane oligomer (formula I) enables the material to maintain low Young's modulus (0.1-10 MPa) for flexibility and bending protection, while the alkoxysilyl groups provide sufficient structural strength through enhanced adhesion and crosslinking.
Data Source
AI summary
Provided is a composition for forming a coating layer of an optical fiber, the composition comprising a compound having a structure represented by the following formula (I):*—NH—CO—N(R1)—R2—SiR3n—(OR4)3-n (I)wherein, R1 is a hydrogen atom, an alkyl group, or an aryl group, R2 is a methylene group optionally substituted with a halogen, a C2-10 alkylene group that may have a heteroatom or an atomic group having a heteroatom between carbon atoms and may optionally be substituted with a halogen, or a phenylene group that may have a substituent, R3 is an alkyl group, and R4 is a C1-6 alkyl group, * being a bond and n indicating an integer of 0 or more and 2 or less.