Patent ID: 6599956
Filing Date: 2003-07-29
Classification: C03C,C08F,C08G,C09D,G02B,Y10T

Abstract:
A radiation-curable coating composition for an optical fiber comprising a reactive functionality-terminated urethane oligomer, wherein said oligomer comprises the reaction product of (i) a semi-crystalline polyol having a molecular weight of from about 200 to about 1000, and (ii) a non-crystalline polyol in the mole ratio of semi-crystalline polyol to non-crystalline polyol of between about 10:1 and 1:10, wherein said non-crystalline polyol is selected from the group consisting of polyether polyols, polyester polyols, polydimethylsiloxane, polystyrene, polycarbonates, acrylated acrylics, or combinations thereof, (iii) at least one isocyanate, and (iv) an endcapping compound capable of supplying the reactive functionality terminus, and wherein the stoichiometry is selected such that, on average, about 50% or more of the oligomer contains a non-crystalline polyol, said coating composition having a freezing temperature below 0Â° C.