D1379 p radiation curable primary coating on optical fiber

The present invention relates to a method for coating the radiation curable coating, coating the coated optical fiber and the optical fiber for use as a primary coating for an optical fiber. The radiation curable coating oligomer; The first diluent monomer; A second diluent monomer; Light initiator; Antioxidants; And further comprising an adhesion promoter, the oligomer is selected from the group consisting of hydroxy ethyl acrylate; Oh, Nate the aromatic isobutanol; Oh, Nate aliphatic between isobutane; Polyol; catalyst; And a reaction product of an inhibitor, the oligomer is from about 4,000 g / mol or more to about 15,000g / mol with a number average molecular weight, the cured film of the radiation-curable primary coating composition comprises from about -25 & lt; 0 & gt; C to about -45 It has a modulus of ℃ peak tan δ Tg and about 0.50MPa to about 1.2 MPa.