MAGNETIC RECORDING MEDIUM

Japanese Patent JP3244129

B2

PURPOSE: To obtain excellent durability by providing a magnetic layer containing a radiation-curing resin obtd. from the reaction of vinyl chloride copolymers and monomers and having 200-400eq./106g urethane link density and a magnetic powder, and then curing the magnetic layer with radiation.
CONSTITUTION: Ethylene double bonds are introduced by urethane link reaction of monomers and vinyl chloride copolymers having 10000-100000mol.wt. and hydroxyl groups and polar groups except for hydroxyl groups. When the urethane link density is within the range of 200-400eq./106g, good balance of dispersibility and hardening property is obtd. If the amt. of unreacted hydroxyl groups in the vinyl chloride copolymers increases, viscosity of the soln. increases because of hydrogen bonding among hydroxyl groups. Thereby, it is necessary to maintain NCO/OH as ≥0.5/1.0. However, it is also necessary to render NCO /OH as ≤0.9/1.0. Therefore, the reaction is effected in a NCO/OH range from 0.5/1.0 to 0.9/1.0, considering the viscosity and reactivity.

JPS6473524	MAGNETIC RECORDING MEDIUM
JPH0344818	MAGNETIC RECORDING MEDIUM
JP6691512	Magnetic recording medium

Takashi Miyamoto
Hiroshi Taki
Hideyuki Ohashi
Nobuichi Kodera

JP35963191A

January 07, 2002

December 26, 1991

Click for automatic bibliography generation  

TOYO BOSEKI KABUSHIKI KAISHA

G11B5/702; C09D5/23; C09D127/04; C09D127/06; C09D175/04; G11B5/73; (IPC1-7): G11B5/702; C09D175/04

JP341618A
JP6472320A
JP467314A
JP6159621A
JP62149763A
JP5677930A
JP5744227A

Previous Patent: クレジットカード活用管理システム

Next Patent: RESIN COMPOSITION FOR SCAGLIOLIA AND METHOD FOR ITS MOLDING FROM THE SAME COMPOSITION