coated fiber
An optical fiber and coating technology, applied in glass optical fibers, clad optical fibers, light guides, etc., can solve problems such as loss and transmission loss, and achieve the effect of excellent anti-microbending loss characteristics and low temperature characteristics.
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Embodiment 1～4 and comparative example 1～3
[0076] As Examples 1 to 4 and Comparative Examples 1 to 3, the Young's modulus of the primary coating layer, the Young's modulus of the secondary coating layer, and the tin content rate in the primary coating layer are based on the physical properties shown in Table 1 below. In this method, a coating layer is formed on a glass optical fiber whose core and cladding layer are both glass using an appropriately selected ultraviolet curable resin composition to produce a coated optical fiber.
[0077] It should be noted that the composition of the ultraviolet curable resin used to form the primary coating layer contains (A) an aliphatic polyol with a molecular weight of 3500 or less, an organic polyisocyanate, a hydroxyl group-containing (meth)acrylate, and a γ-mercaptopropyl group. A (meth)acryloyl carbamate oligomer obtained by reacting trimethoxysilane; (B) a reactive diluent whose glass transition temperature is below 0°C when polymerized with at least one monomer; and (C) an u...
Embodiment 5～8 and comparative example 4～7
[0097] The relationship between the tin content in the coating layer and the low-temperature characteristics was studied. show the result in figure 2 . It should be noted that the Young's modulus of the primary coating layer is set to 1.2MPa, the Young's modulus of the secondary coating layer is set to 800MPa, and the tin content rate in each layer of the primary coating layer and the secondary coating layer is within the range of Examples 5-5. In 8, they were set to 10 ppm, 30 ppm, 50 ppm, and 70 ppm, respectively, and in Comparative Examples 4 to 7, they were set to 80 ppm, 100 ppm, 150 ppm, and 200 ppm, respectively. The coating diameter was set to 125 μm, the thickness of the primary coating layer was set to 32.5 μm, and the thickness of the secondary coating layer was set to 30 μm.
[0098] From the above results, it was confirmed that the coated optical fiber whose primary coating layer Young's modulus, secondary coating layer Young's modulus, and tin content in the c...
Embodiment 9～10
[0101] The relationship of the unreacted initiator dose in the coating layer was investigated. The results are shown in Table 2. It should be noted that the Young's modulus of the primary coating layer was set at 0.8 MPa, the Young's modulus of the secondary coating layer was set at 900 MPa, and the tin content in each layer of the primary coating layer and the secondary coating layer was set at 70 ppm.
[0102] [Table 2]
[0103] Example 9 Example 10 Primary coating Young's modulus (MPa) 0.8 0.8 Secondary coating Young's modulus (MPa) 900 900 Tin content of primary coating layer (ppm) 70 70 Tin content of secondary coating layer (ppm) 70 70 Unreacted Initiator Dose (wt%) 0.5 0.35 microbending characteristics A A low temperature characteristics B A
[0104] When the amount of the unreacted initiator in the coating layer was 0.5% by mass, the low-temperature characteristics were acceptable. Furthermore, when t...
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