Magnetic recording material

Details Magnetic recording material Magnetic recording material

1983-12-06

1987-04-14

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 427 44, 427128, 428694, 428900, G11B 570

Patent

active

046578170

ABSTRACT:
There is provided a magnetic recording material produced by coating on a support a magnetic coating composition which contains as main components a magnetic powder and a binder, the binder comprising an urethane acrylate synthesized using a polyester polyol having a particular structure, and by irradiating the resulting magnetic coat with electron beams to harden it. The polyester polyol contains polyhydric alcohol component, 50 mole % or more of which is a dihydric alcohol selected from the class (A) described below, and/or polybasic acid component, 50 mole % or more of which is a dibasic acid selected from the class (B) described below. The urethane acrylate is synthesized under such a condition that it may have two or more of (meth)acryloyl groups per molecule. Thus, improvements in electromagnetic properties and in durability are attained.

REFERENCES:
patent: 3871908 (1975-03-01), Spoor
patent: 4004997 (1977-01-01), Tsukamoto
patent: 4343831 (1982-10-01), Tsuji
patent: 4415630 (1983-11-01), Kubota
patent: 4448846 (1984-05-01), Chang
patent: 4448848 (1984-05-01), Okita
patent: 4557813 (1985-12-01), Heil
patent: 4559118 (1985-12-01), Heil
patent: 4560456 (1985-12-01), Heil
patent: 4560616 (1985-12-01), Okita
patent: 4576866 (1986-03-01), Okita

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