摘要:
Magnetic recording medium of the type comprising magnetizable particles dispersed in a binder, wherein the binder comprises a star block copolymer having an average of at least six arms.
摘要:
A magnetic paint and objects coated with same are disclosed, where the magnetic paint is characterized by comprising, as its essential components, a block copolymer and magnetic powder, said block copolymer having polyurethane and vinyl polymer segments. The magnetic paint of the present invention exhibits good dispersability of the magnetic powder, and good surface smoothness, durability, and wear resistance of the magnetic recording medium. Objects which may be appropriately coated with the magnetic paint of the present invention include high-quality magnetic recording media, such as magnetic tapes, magnetic cards, prepaid cards, magnetic disks and so on.
摘要:
Eine magnetische Dispersion, bestehend aus feinteiligem Eisenpulver oder Eisenlegierungspulver mit einem BET-Wert von mehr als 35 m 2 /g, welches in einem polymeren Bindemittel und einem organischen Lösungsmittel dispergiert ist und wobei die Filtrierbarkeit markant verbessert ist, wird dadurch erhalten, daß bestimmte niedermolekulare Phosphorsäureester der allgemeinen Formel 1 oder II
in Kombination mit einer dispergieraktiven Verbindung, welche wenigstens eine polare, zur Absorption am magnetischen Pigment befähigte Gruppe enthält, eingesetzt wird. Die polare Gruppe der dispergieraktiven Verbindung kann eine saure oder alkalische oder amphotere Gruppe, eine zur Wasserstoffbrückenbildung befähigte oder polarisierbare Gruppe sein. Die dispergieraktive Verbindung kann ein Polykondensat, ein Polyadditionsprodukt oder ein Copolymerisat sein, welches auch in Kombination mit üblichen anderen polymeren Bindemitteln in der magnetischen Dispersion eingesetzt werden kann.
摘要:
Novel phosphorylated compositions of a reaction product of a normally solid pendant-hydroxyl-containing thermoplastic polymer having at least 8 hydroxyl groups per molecular chain and an adduct which is the product of either a hydroxy-alkyl acrylate or methacrylate or a lactone-acrylate adduct and an organic diisocyanate having improved dispersion characteristics suitable for use in applications such as magnetic recording media are described.
摘要:
Une classe de polyols fluorurés permet d'améliorer, lorsqu'on les ajoute à des dispersions utilisées pour produire un revêtement à base de particules magnétiques, la dispersion des particules dans la composition lors de la fabrication et améliore également les caractéristiques d'usure du revêtement polymérisé lors de son utilisation. Le polyol fluoruré peut être préparé soit par réaction d'un éther de diglycidyle avec un diol soit par réaction de deux diols avec l'épichlorohydrine.
摘要:
A magnetic recording medium improved in the magnetic recording characteristics, running properties and durability is disclosed. The magnetic recording medium comprises a non-magnetic support having on a side of the support an upper magnetic layer positioned farther from the support and a lower magnetic layer positioned closer to the support. The upper magnetic layer comprises a binder, a magnetic powder having an original BET specific surface area of not less than than 30 m²/g and at least one abrasive selected from alumina, silicon carbide, Cr₂O₃, silica, α-Fe₂O₃, TiO₂ and zilconia in a portion of 3 to 20 parts per 100 parts by weight of the magnetic powder, and the lower magnetic layer comprises a binder and a magnetic powder having an original BET specific surface area of less than 30 m²/g, and kinds of the binders each contained in the upper magnetic layer and the lower magnetic layer are the same.
摘要翻译:公开了磁记录特性,运行性能和耐用性得到改善的磁记录介质。 所述磁记录介质包括非磁性支撑件,所述非磁性支撑件在所述支撑件的一侧上具有远离所述支撑件定位的上磁性层和定位成更靠近所述支撑件的下磁性层。 上磁层包含粘合剂,原始BET比表面积不小于30m 2 / g的磁粉和至少一种选自氧化铝,碳化硅,Cr 2 O 3,二氧化硅,α-Fe 2 O 3,TiO 2和紫草的磨料 相对于100重量份磁性粉末为3〜20重量份,下部磁性层含有BET比表面积小于30m 2 / g的粘结剂和磁性粉末,粘结剂种类 包含在上磁层和下磁层中的每个都是相同的。
摘要:
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer mainly composed of needle-like magnetic powder and a binder, the magnetic powder being ferromagnetic metal powder having a coercive force of 1,000 Oe or more and a specific surface area of 45 m2/g (BET method) or more and the binder containing 50 wt % or more resin having high dispersibility due to the presence of at least one polar group selected from the group consisting of (I), (wherein M represents H, Li, Na or K, and M1 and M2 each represent H, Li, Na, K or an alkyl group) to attain excellent magnetic properties required for short-wave recording and improve durability.
摘要:
A magnetic recording medium is disclosed which is produced by applying to a non-magnetic substrate a magnetic coating material containing a ferromagnetic powder and a resinous binder. The coating formed of the magnetic coating material exhibits a deformation ratio (in the direction perpendicular to the film surface from the magnetic layer side) is not more than 1 x 10⁻² µm³/mgf. This magnetic recording medium possesses a high surface accuracy, retains a highly desirable runnability for a long period of time, and excels in durability.
摘要翻译:公开了一种磁记录介质,其通过向非磁性基底施加含有铁磁性粉末和树脂粘合剂的磁性涂层材料而制造。 由磁性涂料形成的涂层表现出的变形率(在与磁性层侧的膜表面垂直的方向上)不超过1×10 -3 m 2 / m 3。 该磁记录介质具有高的表面精度,长时间保持非常理想的运行性能,并且耐久性优异。