Document Type and Number:
Japanese Patent JPS5540930
Kind Code:
B2
Abstract:
A polyester film is disclosed which comprises (a) a polyester mainly consisting of polyethylene terephthalate which includes first inert particles being precipitated in the polyester-forming reaction system and having an average particle diameter of 1 to 3 microns and which shows a solution haze of 25 to 75% and (b) an additive amount of second inert substance particles which are added to said polyester (a) insoluble in said polyester (a), inert to the polyester-forming reaction and have an average particle diameter of 1 to 5 microns. The film is useful as a base of a magnetic tape.
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Application Number:
JP8899175A
Publication Date:
October 21, 1980
Filing Date:
July 21, 1975
Export Citation:
International Classes:
C08L67/00; B29C49/00; B29C55/00; B29C55/12; C08J5/18; G11B5/73; G11B5/733