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Magnetic Tape

IP.com Disclosure Number: IPCOM000098755D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Magnetic tape having excellent wearability is prepared by coating a suitable web with a mixture of very fine magnetic particles in a binder. The web is composed of cellulose acetate, polyethylene or a polyethylene terephtalate plastic having suitable flexibility and linear non-stretch characteristics. A preferred binder magnetic particle mix is made up of the following parts by weight: 3000 magnetic particles such as gamma acicular Fe203 1000 binder as follows: 640 Three to one butadiene acrilonitrile copolymer 340 One or a mixture of the following uncured resins (Phenolic, epoxy, resorcinol, resorcinol aldehyde, resorcinol phenol aldehyde, furfural, and furfuralresorcinol). Related curing agents and stabilizers. 17 soya lecithin 3 methyl (poly) siloxane fluid

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Magnetic Tape

Magnetic tape having excellent wearability is prepared by coating a suitable web with a mixture of very fine magnetic particles in a binder. The web is composed of cellulose acetate, polyethylene or a polyethylene terephtalate plastic having suitable flexibility and linear non-stretch characteristics. A preferred binder magnetic particle mix is made up of the following parts by weight: 3000 magnetic particles such as gamma acicular Fe203

1000 binder as follows:

640 Three to one butadiene acrilonitrile copolymer

340 One or a mixture of the following uncured resins

(Phenolic, epoxy, resorcinol, resorcinol aldehyde,

resorcinol phenol aldehyde, furfural, and

furfuralresorcinol). Related curing agents and stabilizers.

17 soya lecithin

3 methyl (poly) siloxane fluid

The mix is ground together in a mill, thinned with a suitable solvent such as toluene, and applied to the web by a knife or roller coater. The freshly prepared tape is exposed to a heated drying atmosphere for a sufficient time to drive off the excess solvent and for a further five minutes at 240 degrees F. to cure the binder.

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