Polyester films useful as magnetic tapes

Details Polyester films useful as magnetic tapes Polyester films useful as magnetic tapes

1976-07-16

1978-06-20

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 75R, 260DIG35, C08K 316, C08K 326, C08K 509

Patent

active

040961095

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.

REFERENCES:
patent: 3567693 (1971-02-01), Piirma
patent: 3657180 (1972-04-01), Cohn
patent: 3821156 (1974-06-01), Farrar
patent: 3980611 (1976-09-01), Anderson et al.

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