MASTER BATCH FOR USE IN THE PRODUCTION OF BI-AXIALLY ORIENTED POLYALKYLENE FILMS

摘要

The invention concerns a master batch for use in the production of bi-axially oriented polyalkylene films containing spherical solid silicate particles in a matrix of polyalkylene homopolymer or copolymer and equivalent to 1-50 % of total weight, and (where appropriate) a surface-modifying reagent equivalent to 0.1-15 % of total weight which reacts with the silicate surface and improves adhesion between the silicate and polyalkylene. The invention also concerns a process for producing a master batch of this kind, the use thereof to produce bi-axially oriented polyalkylene films, and bi-axially oriented coextruded multi-layer polyalkylene films.