Masterbatch composition, the rubber composition and the vulcanizates comprising the same

The present invention is to provide a masterbatch composition capable of enhancing the dispersibility of the short fibers in a rubber composition mainly intended. The present invention, alpha, beta-ethylenically unsaturated nitrile monomer units containing copolymer rubber and (A) five to seventy-eight parts by weight multi-functional compounds (B) and / or molecular weight plasticizer is 400 or more ( B ') and 5 to 78 parts by weight of short fibers (C) from 17 to 90 parts by weight (provided that (a) of the length of 0.1~12mm and, (B) and / or (B' and), (C ) the sum of by providing a masterbatch composition comprising a 100 parts by weight), to solve the above problems.