SUPERCOATINGS D1381 FOR OPTIC FIBRE Russian patent published in 2012 - IPC C09D175/14 C09D175/16 C03C25/10 C03C25/26 

FIELD: construction.

SUBSTANCE: supercoating contains at least two layers, at the same time the first layer is a primary coating, which is in contact with the outer surface of optic fibre, and the second layer represents the secondary coating, which is in contact with the outer surface of the primary coating, at the same time the hardened primary coating on the optic fibre has the following properties after initial hardening and after one month of ageing at 85°C and 85% relative humidity: A) % RAU from 84% to 99%; B) in-situ elasticity module between 0.15 MPa and 0.60 MPa; and C) glass-transition temperature of the tube is from -25°C to -55°C. At the same time the hardened secondary coating on optic fibre has the following properties after initial hardening and after one month of ageing at 85°C and 85% relative humidity: A) % RAU from 80% to 98%; B) in-situ elasticity module between 0.60 GPa and 1.90 GPa; and C) glass-transition temperature of the tube is from 50°C to 80°C.

EFFECT: improved technological or operational characteristics.

12 cl