D1451 METHODS OF FORMULATING RADIATION CURABLE SUPERCOATINGS FOR OPTICAL FIBRE Russian patent published in 2014 - IPC C03C25/12 C03C25/24 

FIELD: chemistry.

SUBSTANCE: invention relates to radiation curable supercoatings on optical fibre. The supercoating includes a primary coating and a secondary coating. After initial curing and after at least one month of ageing at 85°C and relative humidity of 85%, the primary coating has the following properties: 1) % RAU from 84% to 99%; 2) modulus of elasticity from 0.15 MPa to 0.60 MPa; 3) tube T_g from -25°C to -55°C. After initial curing and after at least one month of ageing at 85°C and relative humidity of 85%, the secondary coating has the following properties: 1) % RAU from 80% to 98%; 2) modulus of elasticity from 0.060 GPa to 1.90 GPa; 3) tube T_g from 50°C to 80°C. The maximum acceptable increase in attenuation requirements for the telecommunications network where the optical fiber will be installed are determined first. Operating conditions of the supercoatings are then determined. A composition of the primary and secondary coatings in a liquid, uncured state is then formulated. The primary and secondary coatings are tested to determine properties of the supercoatings. If the required properties of the supercoatings are not obtained, the primary and/or secondary coatings are re-formulated to achieve given properties.

EFFECT: reduced microbending of the fibre and signal attenuation.

2 cl, 6 ex, 13 dwg