D 1369 D RADIATION-CURABLE SECONDARY COATING FOR OPTICAL FIBRE Russian patent published in 2011 - IPC C09D175/14 C09D175/16 C03C25/10 C03C25/26 

FIELD: chemistry.

SUBSTANCE: radiation-curable secondary coating composition contains a mixture of secondary coating oligomers which is mixed with a first diluent monomer; a second diluent monomer; an optional third diluent monomer; an antioxidant; a first photoinitiator; a second photoinitiator; and, optionally, a slide-enhancing additive or a mixture of slide-enhancing additives; wherein said mixture of secondary coating oligomers contains: α) Omega-oligomer; and β) Upsilon-oligomer; wherein said Omega-oligomer is synthesised from reaction of α1) hydroxyl-containing (meth)acrylate; α2) isocynate; α3) polyether polyol; and α4) tripropylene glycol; in the presence of α5) a polymerisation inhibitor; and α6) a catalyst; to obtain an Omega-oligomer; wherein said catalyst is selected from a group comprising copper naphthenate, cobalt naphthenate, zinc naphthenate, triethylamine, triethylenediamine, 2-methyltriethylenediamine, dibutyl tin dilaurate, metal carboxylates, sulphonic acids, catalysts based on amines or organic bases, zirconium and titanium alkoxides and ionic liquid salts of phosphonium, imidazolium and pyridinium; and wherein said Upsilon-oligomer is epoxy diacrylate. The method of applying the coating onto an optical fibre involves operation of a glass drawing column to obtain optical glass fibre; applying a radiation-curable primary coating composition onto said optical glass fibre; optional exposure of said radiation-curable primary coating composition to radiation in order to cure said coating; applying a radiation-curable secondary coating composition in paragraph 1 onto said optical glass fibre; and exposing said radiation-curable secondary coating composition to radiation in order to said coating.

EFFECT: obtaining optical fibre and a conductor having a cured secondary coating.

6 cl