| abstract |
A polyester based film for a magnetic recording medium is provided, which comprises a polyester. film (2) and a discontinuous film (1) formed on at least one surface of the polyester film. The discontinuous film (1) has a thickness of smaller than 500 angstroms and is composed mainly of a water-soluble polymer, a silane coupling agent, and if desired, a silicone resin. A high density magnetic recording medium is also provided, which comprises a ferromagnetic metal thin film formed on the discontinuous film layer (1, 2) of the polyester base film. The polyester base film is especially suitable for formation of a metallized video tape, and this tape is excellent in the slip characteristics and abrasion resistance and advantageous in that noises and drop-out are reduced. |