Abstract: An adhesive binder for optical fiber packages is described which comprises a silicone-epoxy IPN (Interpenetrating Polymer Network), with the epoxy cured to give reinforcing domains within the cured silicone. The adhesive binder is prepared by cross-linking and polymerizing a silicone polymer and an epoxy resin, with a cross-linking agent and a catalyst for curing the epoxy and silicone, optionally with the addition of a silane wetting agent, such as methacryloxypropyl trimethoxysilane. In preparing a wound optical fiber package, the adhesive binder is applied in solution to the fiber, during its winding, by passing the fiber through the solution or by brushing the solution on each layer when its winding is completed.

Abstract: There is disclosed a method for preparing a thermoplastic elastomer composition which exhibits improved mechanical properties, said method comprising:(I) reacting(A) a fluorocarbon resin with(B) a grafting agent, in the presence of(C) a radical initiator,to prepare a modified fluorocarbon resin;(II) mixing said modified fluorocarbon resin with(D) a silicone base consisting essentially of a diorganopolysiloxane gum having an average of at least 2 alkenyl radicals in its molecule and a reinforcing filler,(E) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule, and(F) a hydrosilation catalyst,components (E) and (F) being present in an amount sufficient to cure said diorganopolysiloxane; anddynamically curing said diorganopolysiloxane.