Magnetic recording medium
AssigneeKao Corporation
InventorsAtsushi Suzuki, Shigeru Koyama
Life of this patent
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Abstract
A magnetic recording medium comprising a non-magnetic support, a magnetic layer, and an undercoat layer provided therebetween, and said undercoat layer comprising: (A) at least one resin selected from the group consisting of polyester resins having one or more hydroxyl groups and polyurethane resins having one or more hydroxyl groups; (B) a polyisocyanate compound (C) at least one compound selected from the group consisting of organometallic compounds and tertiary amine compounds; and (D) carbon black having an average single particle size of 50 .mu.m or smaller and an oil absorption of 100 g DBP/100 g or less; and having an (A)/(D) content ratio of 30/70 to 70/30, by weight, a (B) content of 15 to 50 wt. % based on component (A), and a (C) content of 0.5 to 5 wt. % based on component (A).
Claims1
A magnetic recording medium comprising a non-magnetic support, a magnetic layer, and an undercoat layer provided therebetween, and said undercoat layer comprising:
- (A) at least one resin selected from the group consisting of polyester resins having one or more hydroxyl groups and polyurethane resins having one or more hydroxyl groups;
- (B) a polyisocyanate compound;
- (C) at least one compound selected from the group consisting of organometallic compounds and tertiary amine compounds;
- and
- (D) carbon black having an average single particle size of 50 .mu.m or smaller and an oil absorption of 100 g DBP/100 g or less;
- and having an (A)/(D) content ratio of 30/70 to 70/30, by weight, a (B) content of 15 to 50 wt. % based on component (A), and a (C) content of 0.5 to 5 wt. % based on component
Dependencies are inferred from the claim text.