D1365 BJ RADIATION-CURABLE PRIMARY COATING FOR OPTICAL FIBRE Russian patent published in 2011 - IPC C09D175/14 C09D175/16 C03C25/10 C03C25/26 

FIELD: chemistry.

SUBSTANCE: radiation-curable primary coating composition for optical fibre or wire contains A) an oligomer; B) a first diluent monomer; C) a second diluent monomer; D) a third diluent monomer; E) a first light stabiliser; F) a first photoinitiator; G) a second photoinitiator; H) an antioxidant; I) a second light stabiliser; J) an adhesion promoter; where said oligomer is a product of reaction of: i) hydroxyl-containing (meth)acrylate; ii) isocyanate; iii) polyether polyol; iv) a polymerisation inhibitor; v) a catalyst; vi) a diluent; where said oligomer has number-average molecular weight ranging from at least 4000 g/mol to less than or equal to 15000 g/mol; and where said catalyst is selected from a group consisting of copper naphthenate; cobalt naphthenate; zinc naphthenate; triethylamine; triethylene diamine; 2-methyl triethylene amine; dibutyl tin dilaurate, metal carboxylates, sulphonic acids, catalysts based on amines or organic bases, zirconium and titanium alcoholates, and ionic liquid salts of phosphonium, imidazolium and pyridinium, and where the hardened film of said radiation-curable primary coating composition has peak value tan δ T_c, measured as indicated in the description, ranging from 25°C to -55°C and modulus of elasticity from 0.85 MPa to 1.10 MPa.

EFFECT: improved production and operational characteristics of primary coatings.

5 cl