摘要:
A magnetic recording medium comprising a nonmagnetic support having provided thereon a magnetic layer comprising ferromagnetic particles dispersed in a binder, said magnetic layer having therein or on its surface a fluorine-containing oligomer surfactant which has a side chain having a poly(alkylene oxide) structure, a side chain terminated with a perfluoroalkyl group, and a side chain derived from an ester of acrylic or methacrylic acid with an aliphatic alcohol.
摘要:
A magnetic recording medium is disclosed, which comprises a non-magnetic support having provided thereon a magnetic layer mainly composed of a ferromagnetic powder and a binder resin comprising (i) a polymer having at least one polar group selected from --SO.sub.3 M.sup.1, --OSO.sub.3 M.sup.1, --COOM.sup.1, ##STR1## wherein M.sup.1 represents a hydrogen atom, Li, Na or NR.sub.4 (wherein R represents a hydrogen atom, an alkyl group, an alkenyl group, or an alkanol group), and M.sup.2 represents a hydrogen atom, Li, Na, an alkyl group, or NR.sub.4 (wherein R has the same significance as defined above); or (ii) a compound having at least one polar group selected from --SO.sub.3 M.sup.3, --COOM.sup.3, and --PO.sub.3 (M.sup.3).sub.2 (wherein M.sup.3 represents a hydrogen atom, an alkali metal, or an ammonium group) and containing at least one carbon-carbon unsaturated bond in the molecule, said magnetic layer containing at least one ester compound represented by following formula (I), (II), or (III), and when the binder resin comprises the compound (ii), the magnetic layer is irradiated by radiations: ##STR2## wherein R.sup.1 represents a straight chain or branched alkyl group having from 7 to 29 carbon atoms or a straight chain or branched alkenyl group having from 7 to 29 carbon atoms; l, k, m, and n represents an integer; l and n each is at least 2, and the sum of n and m and the sum of k and l are from 7 to 33.
摘要翻译:公开了一种磁记录介质,其包括其上设置有主要由铁磁粉末和粘合剂树脂构成的磁性层的非磁性载体,所述磁性层包含(i)具有至少一个选自-SO 3 M 1,-OSO 3 M 1, -COOM1,其中M1表示氢原子,Li,Na或NR4(其中R表示氢原子,烷基,烯基或链烷醇基),M2表示氢原子,Li,Na ,烷基或NR4(其中R具有与上述相同的含义); 或(ii)具有选自-SO 3 M 3,-COOM 3和-PO 3(M3)2中的至少一个极性基团的化合物(其中,M3表示氢原子,碱金属或铵基),并且含有至少一个碳 所述磁性层含有至少一种由下式(I),(II)或(III)表示的酯化合物,并且当粘合剂树脂包含化合物(ii)时,磁性层为 (I)其中R1表示具有7至29个碳原子的直链或支链烷基或具有7个碳原子的直链或支链烯基 至29个碳原子; l,k,m,n表示整数; l和n各自为至少2,n和m之和以及k和l之和为7至33。
摘要:
A magnetic recording medium comprises a nonmagnetic support and a magnetic recording layer containing a ferromagnetic powder which is provided on the support. The magnetic recording layer contains a binder resin having a acid residue or a salt thereof and a fatty acid ester compound having the formula (I): ##STR1## wherein R is a hydrocarbon group having 11-21 carbon atoms, R.sup.1 is hydrogen atom or a hydrocarbon group having 1-3 carbon atoms, and R.sup.2 and R.sup.3 are the same or different and each is a hydrocarbon group having 1-8 carbon atoms. The total number of carbon atoms contained in R.sup.1, R.sup.2 and R.sup.3 being not less than 3 carbon atoms. Alternatively, the fatty acid ester can be coated on the magnetic layer.
摘要:
A magnetic recording medium comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein the magnetic layer contains at least one lubricating agent selected from the group consisting of a salt of a sulfonic acid and a salt of sulfuric acid ester.
摘要:
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer containing (a) ferromagnetic particles, (b) a binder containing at least one resin substituted with at least one polar group selected from an --SO.sub.3 M group, a --COOM group, an --OSO.sub.3 M group, an ##STR1## group and a ##STR2## group, wherein M represents H, Li, Na or K and M' represents H, Li, Na, K or an alkyl group, and (c) at least one fatty acid lubricating agent comprising at least one fatty acid derivative represented by formula (I): ##STR3## in which R represents a hydrocarbon group having from 11 to 21 carbon atoms, X represents hydrogen or a methyl group, R' represents a hydrocarbon group having from 1 to 8 carbon atoms and n is an integer of from 2 to 20.
摘要:
A magnetic recording medium comprising a magnetic layer coated on one side of a non-magnetic support and a backing layer coated on the opposite side of the non-magnetic support, wherein the backing layer comprises non-magnetic particles, a binder and silicone having a viscosity of from 1 to 50 CS (centistokes) at 25.degree. C. in an amount of from 0.01 to 3 wt. % based on the non-magnetic particles, wherein the non-magnetic particles contain carbon black in an amount of at least 50 wt. % based on the total amount of the non-magnetic particles, and wherein 25 wt. % or more of the carbon black has an average particle size of from 150 to 1,000 m.mu..
摘要:
A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles, a binder, non-magnetic particles, and lubricating agents, wherein said magnetic layer contains (i) carbon black (A) having an average particle size of 25 m.mu. or less and a BET specific surface area of from 150 to 250 m.sup.2 /g and carbon black (B) having an average particle size of from 10 to 30 m.mu. and a BET specific surface area of 700 m.sup.2 /g or more, and (ii) a fatty acid ester and a fatty acid amide in a total amount of 7 wt % or more based on the weight of the ferromagnetic particles.
摘要:
A novel noncrystalline fibrous potassium titanate and a process for preparing said titanate fiber by calcination of a mixture of potassium compound(s) and titanium compound(s) at a temperature of from 800.degree. C. to the melting point of the mixture to obtain whiskers formed on the surface thereof; and an improved process for preparing fibrous potassium hexatitanate which comprises calcining hydrated fibrous potassium titanate at a temperature of 500.degree. to 900.degree. C. or which comprises kneading a mixture of potassium compound(s) and titanium compound(s), and calcining the thus kneaded mixture at a temperature of 1150.degree. to 1300.degree. C. to obtain fibers from the inside of the bulk of the calcined mixture are described.
摘要:
An alumina-chrome refractory composition comprises 30-60% by weight of alumina-silica type material containing 50-95% by weight of alumina with the major part in coarse particle size, and 70-40% by weight of chrome type material with the major part in fine particle size. In a modification, the alumina-chrome refractory composition comprises 70-99% by weight of a mix consisting of the alumina-silica type material and chrome type material in the above percentages, and 1-30% by weight of at least one of the materials selected from the group consisting of alumina, zircon, zirconia, magnesia, spinel, clay, silicon carbide and titanium oxide in fine particle size ranges.