C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 77/10 (2006.01) C08J 5/18 (2006.01) C08L 79/08 (2006.01) G11B 5/62 (2006.01) G11B 5/73 (2006.01)
Patent
CA 2198532
An aromatic polyamide and/or aromatic polyimide film suitable as a support in a magnetic recording medium excellent in runnability and scratch resistance and good in S/N ratio comprises an aromatic polyamide and/or aromatic polyimide as a main component, with particles present in the film, which film has characteristics which satisfy the following formulae: 10nm dmax 300nm (1) 3 p(dmax) / p(dmin) 100 (2) or 10nm dmax 300nm (3) 3 p(dmax) / p(d") 100 (4) p(dmax) / p(dmin) >100 (5) where dmax is the depth from a first surface of the film at which the particle density shows the first maximal value; dmin is the depth at which the particle density shows the first minimal or minimum value in a range from dmax to 1 µm from the said first surface; the linear differential coefficient of the particle density distribution curve has an inflection point at which the quadratic differential coefficient of the particle density distribution curve ia a negative, which inflection point occurs at a depth d", deeper than dmax, and within a range between the depth at which p(d) is 4/5 of p(dmax), and dmin; and p(d) is the particle density at each depth.
ellicule de polyamide aromatique et/ou de polyimide aromatique pouvant servir de support d'enregistrement magnétique et dont l'aptitude au défilement sans rupture et la résistance à la rayure sont excellentes et le rapport signal sur bruit est bon. Le polyamide aromatique et/ou le polyimide aromatique, présent sous forme de particules dans la pellicule, est un élément principal de la pellicule dont les caractéristiques respectent la formulation suivante : 10 nm.
Itoh Nobuaki
Sueoka Masanori
Tsuzuki Toshihiro
Smart & Biggar
Toray Industries Inc.
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