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D1363 BT RADIATION CURABLE PRIMARY COATINGS ON OPTICAL FIBER

  • US 20080226916A1
  • Filed: 12/13/2007
  • Published: 09/18/2008
  • Est. Priority Date: 12/14/2006
  • Status: Abandoned Application
First Claim
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1. A radiation curable Primary Coating composition comprising at least one (meth)acrylate functional oligomer and a photoinitiator,wherein the urethane-(meth)acrylate oligomer comprises (meth)acrylate groups, at least one polyol backbone and urethane groups,wherein about 15% or more of the urethane groups are derived from one or both of 2,4- and 2,6-toluene diisocyanate,wherein at least 15% of the urethane groups are derived from a cyclic or branched aliphatic isocyanate, andwherein said (meth)acrylate functional oligomer has a number average molecular weight of from at least about 4000 g/mol to less than or equal to about 15,000 g/mol;

  • andwherein a cured film of the radiation curable Primary Coating composition has a modulus of less than or equal to about 1.2 MPa.

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