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Optical fibers and core - forming compositions

  • US 5,314,979 A
  • Filed: 12/09/1991
  • Issued: 05/24/1994
  • Est. Priority Date: 12/10/1990
  • Status: Expired due to Term
First Claim
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1. A composition for forming optical fiber cores, comprising(A) an organopolysiloxane having a unit of formula (1):

  • 
    
    space="preserve" listing-type="equation">R.sup.1 SiO.sub.3/2 (

         1)wherein R1 is an unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms in its molecule or a halogenated derivative thereof and has at least 0.05 alkenyl groups, each directly attached to a silicon atom, per silicon atom,(B) an organopolysiloxane having at least 2 hydrogen atoms each directly attached to a silicon atom per molecule,(C'"'"') a platinum catalyst or a radical polymerization initiator or both, and(E) a carboxylate of formula (3);

    ##STR6## wherein RA a hydrogen or a methyl group and RB is hydrogen an unsubstituted monovalent hydrocarbon group having 1 to 18 carbon atoms or a halogenated monovalent hydrocarbon group having 1 to 18 carbon atoms;

    wherein said carboxylate (E) is contained in an amount of about 0.5 to about 50% by weight based on the total weight of the composition.

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