The method includes the steps of: providing fibers of a desired length; treating the fibers with a treating liquid made up of a nitrile rubber modified epoxy resin and an alkylphenol•formaldehyde resin; and dispersing {HEAD ~ the treated fibers} in {TAIL ~ rubber} 
The method includes the steps of : providing fibers of a desired length ; treating the fibers with a treating liquid made up of a nitrile rubber modified epoxy resin and an alkylphenol•formaldehyde resin ; and dispersing { HEAD ~ the treated fibers } in { TAIL ~ rubber }
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