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Coated optical fibers

An optical fiber and coating technology, applied in the direction of light guide, cladding optical fiber, glass optical fiber, etc., can solve problems such as high stress and abnormal temperature

Inactive Publication Date: 2003-05-21
DSM IP ASSETS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these coatings still need to be further improved in terms of strength or integrity, because some disadvantages still occur during the use of coated optical fibers, especially in the course of time (during production, cabling or when it is buried underground). Will be subjected to extremely high stress and abnormal temperature, in which case the coated fiber will still show some defects

Method used

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  • Coated optical fibers
  • Coated optical fibers
  • Coated optical fibers

Examples

Experimental program
Comparison scheme
Effect test

comparative test A

[0282] The coating was prepared using 50% by weight of polyether urethane acrylate (theoretical molecular weight about 9000), about 20% by weight of 8 ethoxylated nonylphenol acrylates, 20% by weight of lauryl acrylate, 6% N-vinylcaprolactam, 1.5% by weight of Lucirine TPO, 0.8% by weight of Irganox 1035, 0.1% by weight of diethanolamine and 0.3% by weight of Seesorb 102.

[0283] The measurement results are as follows: the equilibrium modulus is 0.4MPa, E' 23 It is 0.5MPa, the strain hardening is very small, Go=26J / m 2 . Use 1J / cm 2 The amount of radiation for curing. In the relative Mooney graph of Figure 4, this coating is represented by the graph of Comparative Example A. The hole intensity σ where the tenth hole appears 10 It is 0.96MPa (see Figure 3).

[0284] Compare Test B and Example 1

[0285] A general-purpose coating with an equilibrium modulus of 1.0 MPa is used. In comparative test B, the sample was used with 1J / cm 2 The amount of radiation for curing. ...

comparative test C

[0296] Prepare the coating with 60% by weight of polyether urethane acrylate (theoretical molecular weight is about 4000), 18.6% by weight of 4 ethoxylated nonylphenol acrylates, 4% by weight of 1-2-hydroxypropyl Phenoxyacrylate, 7% by weight lauryl acrylate, 7.8% by weight N-vinylcaprolactam, 1.2% by weight Lucirine TPO, 0.3% by weight Irganox 1035 and 1% by weight diethanolamine.

[0297] The test results are as follows: the equilibrium modulus is 1.2MPa. Calculated volumetric thermal expansion coefficient α 23 is 7.15×10-4 K -1 .

[0298] The comparison between the primary coating of Example 3 and the coating of Comparative Test C shows that the coating of Example 3 (its α 23 The actual stress level in the claims) is reduced. In the primary coating, the gain in stress reduction depends on the volumetric thermal expansion coefficient of the secondary coating. In general, for α 23 3.0×10 -4 K -1 The stress on the primary coating of Example 3 is about 20% lower than th...

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Abstract

The invention relates to coated optical fibers comprising soft primary coatings and to such primary coatings for protecting glass optical fibers having a sufficient high resistance against cavitation. In particular, the primary coatings have a cavitation strength at which a tenth cavitation appears ( sigma <10>cav) of at least about 1.0 MPa as measured at a deformation rate of 0.20% min<-1> and of at least about 1.4 times their dynamic modulus at 23 DEG C. The coating preferably shows strain hardening in a relative Mooney plot, preferably has a strain energy release rate Go of about 20 J / m<2> or more, and preferably has a low volumetric thermal expansion coefficient. The invention furthermore provides a method and apparatus for measuring the cavitation strength of a primary coating.

Description

technical field [0001] The present invention relates to coated optical fibers comprising a primary coating and a secondary coating, radiation curable primary coating compositions, combinations of primary and secondary coatings, optical fibers comprising at least one of the aforementioned coated optical fibers Optical fiber ribbons and methods and apparatus for measuring the coating cavitation intensity of a primary coating on an optical fiber. Background technique [0002] Because the optical fiber is brittle and easy to break, it is usually coated with a coating material of radiation curable resin composition on the optical fiber. It is known that the transmission properties of the fiber are significantly affected by properties such as the modulus of the primary coating material in direct contact with the fiber. When an optical fiber is coated with a primary coating material whose equilibrium modulus is about 2 MPa or higher, the transmission loss of the optical fiber may ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/44C01B32/50C03C25/10C03C25/106C03C25/24C03C25/32C03C25/50C08F220/26C08F220/36C08F230/02C08G18/28C08G18/67C08G18/80C08G18/81C09D4/00C09D4/02C09D5/00C09D175/16C09D201/00G01L1/00
CPCC09D175/16C09D4/00C08G18/672C08F230/02C08F220/36C08G18/284C08G18/285C08G18/8175G02B6/02395C08G18/8064C03C25/106C08F220/26G02B6/4403C08F222/1065C08G18/48C08F220/301C08F222/102C03C25/50
Inventor M·J·H·布尔特斯G·雷克尔斯P·W·P·V·布莱曼J·M·H·林森A·A·M·斯特雷克斯J·A·范埃克伦A·G·M·阿贝尔M·多尔舒P·A·M·斯特曼
Owner DSM IP ASSETS BV
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