Optical fiber coating composition

A coated optical fiber comprising:

• a glass optical fiber comprising a glass core and a glass cladding disposed about the glass core;
• and
• a cured reaction product of a radiation-curable optical fiber coating composition disposed about the glass optical fiber, the radiation-curable optical fiber coating composition comprising
• at least 20 wt % of one or more at least trifunctional ethylenically unsaturated monomers, each having three or more free radical polymerizable ethylenic unsaturations;
• at least 20 wt % of one or more at least trifunctional thiol monomers, each having three or more free radical polymerizable thiols;
• and
• an effective amount of a free radical photoinitiator,
• wherein at least 50 wt % of a total amount of the one or more at least trifunctional ethylenically unsaturated monomer is made up of aromatic monomers and/or at least 50 wt % of a total amount of the one or more at least trifunctional thiol monomers is made of up aromatic monomers, and
• wherein at least 50 wt % of a total amount of the one or more at least trifunctional thiol monomers is made of up aromatic monomers.

A coated optical fiber comprising:

• a glass optical fiber comprising a glass core and a glass cladding disposed about the glass core;
• and
• a cured reaction product of a radiation-curable optical fiber coating composition disposed about the glass optical fiber, the radiation-curable optical fiber coating composition comprising
• at least 20 wt % of one or more at least trifunctional ethylenically unsaturated monomers, each having three or more free radical polymerizable ethylenic unsaturations;
• at least 20 wt % of one or more at least trifunctional thiol monomers, each having three or more free radical polymerizable thiols;
• and
• an effective amount of a free radical photoinitiator,
• wherein a ratio of a number of polymerizable ethylenic unsaturations of the radiation-curable optical fiber coating composition to a number of polymerizable thiols of the radiation-curable optical fiber coating composition is at least about 1,
• wherein at least 50 wt % of a total amount of the one or more at least trifunctional ethylenically unsaturated monomer is made up of aromatic monomers and/or at least 50 wt % of a total amount of the one or more at least trifunctional thiol monomers is made of up aromatic monomers, and
• wherein at least 50% of a total amount of the one or more at least trifunctional ethylenically unsaturated monomers is made up of 1,3,5-triallyl-1,3-5-triazine-2,4,6(1H,3H,5H)trione (triallyl isocyanurate);
• 2,4,6-triallyloxy-1,3,5-triazine (triallyl cyanurate);
• triallyl trimesate;
• trimethylolpropane tri(meth)acrylate;
• ethoxylated trimethylolpropane tri(meth)acrylate;
• propoxylated trimethylolpropane tri(meth)acrylate;
• pentaerythritol tetra(meth)acrylate;
• ethoxylated pentaerythritol tetra(meth)acrylate;
• propoxylated pentaerythritol tetra(meth)acrylate;
• pentaerythritol tri(meth)acrylate;
• ethoxylated pentaerythritol tri(meth)acrylate;
• propoxylated pentaerythritol tri(meth)acrylate;
• ethoxylated glyceryl tri(meth)acrylate;
• propoxylated glyceryl tri(meth)acrylate;
• tris(2-hydroxyethyl)isocyanurate triacrylate;
• allylated or (meth)acrylated derivatives of hexamethoxymethylmelamine having the formula C3N3—(N(CH2OR)2)3 in which each R is H, (C1-C4 alkyl)-, allyl-, or (meth)acryl(C2-C4alkyl)-, provided that at least 3 Rs are polymerizable;
• the compound of any of formulae (I)-(VI)
• pentaerythritol allyl ether having at least 3 allyl substitutions;
• and/or trimethylolpropane triallyl ether.