Magnetic recording tape comprising a polyester film containing a

Details Magnetic recording tape comprising a polyester film containing a Magnetic recording tape comprising a polyester film containing a

1989-08-23

1992-07-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428480, 428693, 428694, 428900, 428141, 428701, 428702, G11B 500

Patent

active

051321580

ABSTRACT:
The abrasion resistance of a nonmagnetic substrate of a polyester film of a magnetic recording tape can be improved without the use of a backcoating layers by adding a pH basic filler to the polyester film. The pH basic filler should exhibit a blue color when Bromothymol Blue, a basicity indicator, is adsorbed thereon.

REFERENCES:
patent: 4720412 (1988-01-01), Katoh et al.
patent: 4803121 (1989-02-01), Ryoke et al.
patent: 4818581 (1989-04-01), Katoh et al.

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