Browse Prior Art Database

Wear Resistant Magnetic Coating for Magnetic Tape

IP.com Disclosure Number: IPCOM000094468D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Levine, P: AUTHOR

Abstract

This magnetic coating is for magnetic recording tapes and improves wear resistance.

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This is the abbreviated version, containing approximately 100% of the total text.

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Wear Resistant Magnetic Coating for Magnetic Tape

This magnetic coating is for magnetic recording tapes and improves wear resistance.

Nylon is wear resistant and has a low coefficient of friction as is evidenced by its use for gears, etc. Such properties are desirable for magnetic tapes. However, it is not practical to disperse magnetic oxides in nylon and apply the dispersion as a coating to a backing because of the high melting point and low solubility of nylon.

Methods of polymerizing of caprolactam to nylon 6 in the form in which it is to be finally used rather than making a mold powder which is then molded to its final shape are known. Note U. S. patents 3,017, 391, 3,017, 392 and 3,018,273 assigned to Monsanto Chemical Co. Thus, these methods are used to disperse a magnetic oxide in a monomeric caprolactam or a solution thereof. Bhen, it is coated on a substrate such as, e. g., MYLAR*, and polymerized on the substrate to produce an adherent, wear resistant coating which is an improvement over the coatings now in use.

Alternately, a dilactam or a lactam of higher functionality is added to crosslink the polymer formed, thus further increasing wear resistance, toughness and resistance to high temperatures. This is because the necessity for fusing the material to mold it is eliminated. The length of the link between the lactam rings and the degree of crosslinking is varied to optimize the physical properties.

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