Patent ID: 6080483
Filing Date: 2000-06-27
Classification: C03C,C08G,C09D,Y10T

Abstract:
A coated glass optical fiber coated with a radiation cured outer primary coating obtained from a composition comprising as premixture components, the combination of:about 20 to about 40% by weight of a polyether urethane first oligomer comprising ethylenically unsaturated groups;from about 5 to about 20% by weight of a reactive diluent;from 0 to about 40% by weight of a photoinitiator;from 0 to about 10% by weight of a pigment; andabout 40 to about 80% by weight of a radiation-curable second oligomer represented by the following formula:R.sup.1 -L.sup.1 -C.sup.1 -L.sup.2 -R.sup.2 ( 1)where:R.sup.1 and R.sup.2, independently, each represent a radiation-curable ethylenically unsaturated functional group;L.sup.1 and L.sup.2, independently, each represent an alkyloxy chain having from about 2 to about 40 carbon atoms, wherein L.sup.1 and L.sup.2 are linked to C.sup.1 through an oxygen atom; andC.sup.1 comprises a hydrocarbon having from about 5 to about 40 carbon atoms and containing at least one cyclic group;wherein said composition, after radiation-cure, has a peak water absorption of no more than 1.5%.