Browse Prior Art Database

Magnetic Coating Compositions

IP.com Disclosure Number: IPCOM000074692D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Denk, HH: AUTHOR [+2]

Abstract

The described magnetic coating compositions are particularly suitable for imparting magnetic data fields to paper, card stock, film or other substrates. These compositions comprise a magnetic oxide pigment and a binder selected from certain water-based acrylic resin emulsions. Generally these compositions consist of 40 to 80 parts by weight of an aqueous acrylic resin emulsion comprising a methylmethacrylate ethyl acrylate copolymer, 30 to 60 parts by weight of a ferromagnetic oxide pigment, 0 to 4 parts by weight of a dispersing agent capable of dispersing the ferromagnetic oxide pigment 0 to 5 parts by weight and an antifoaming agent, 0-20 parts by weight of an antiblocking agent, 0 to 20 parts by weight of a surface hardening agent, and 0-10 parts by weight of modifying agents.

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Magnetic Coating Compositions

The described magnetic coating compositions are particularly suitable for imparting magnetic data fields to paper, card stock, film or other substrates. These compositions comprise a magnetic oxide pigment and a binder selected from certain water-based acrylic resin emulsions. Generally these compositions consist of 40 to 80 parts by weight of an aqueous acrylic resin emulsion comprising a methylmethacrylate ethyl acrylate copolymer, 30 to 60 parts by weight of a ferromagnetic oxide pigment, 0 to 4 parts by weight of a dispersing agent capable of dispersing the ferromagnetic oxide pigment 0 to 5 parts by weight and an antifoaming agent, 0-20 parts by weight of an antiblocking agent, 0 to 20 parts by weight of a surface hardening agent, and 0-10 parts by weight of modifying agents.

These formulations are particularly advantageous for use as coating compositions to be used in the preparation of data processing tape. Such coatings must provide a dry film, which is highly abrasion resistant, tough, smooth and has a high cohesive strength. While these properties are all obtained by the magnetic tape coated with the above composition, the coating method as such is relatively easy, since simple mixing and application techniques can be used.

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