Magnetic recording element

Claim 1

A magnetic recording element suitable for use in an automatic ticket vending unit and an automatic ticket checking and collecting unit which consists essentially of a substrate of sheet paper and a layer coated thereon, said layer consisting essentially of 100 parts by weight of ferrite particles, 1 to 2 parts by weight of a dispersing agent for the ferrite having a particle size of 0.5 to 1 micron, said dispersing agent selected from the group consisting of sodium pyrophosphate, sodium hexametaphosphate, sodium polyphosphate and sodium lignosulfonate; 5 to 15 parts by weight of an alkaline modified protein, said alkaline modified protein selected from the group consisting of alkaline modified milk casein and alkaline modified soybean protein; 15 to 30 parts by weight of a rubber-like synthetic polymer selected from the group consisting of poly(styrene-butadiene), poly(acrylonitrile-butadiene) and acrylic resin; and 1 to 2 parts by weight of a hardening agent for said protein, said hardening agent selected from the group consisting of aminoaldehyde resin and modified polyamide resin, said layer disposed onto said sheet of paper in an amount of about 35 to 55 g/m 2 .