公开(公告)号：US4374118A

公开(公告)日：1983-02-15

申请号：US318413

申请日：1981-11-05

申请人： Giampiero Basile ,  Giancarlo Boero ,  Emiliano M. Ceresa ,  Franco Montino

发明人： Giampiero Basile ,  Giancarlo Boero ,  Emiliano M. Ceresa ,  Franco Montino

IPC分类号： C01G37/027 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70636 ,  C01G37/027 ,  C01P2006/42

摘要： This invention relates to a process for stabilizing ferromagnetic chromium dioxide in respect of water and oxidizable organic compounds which it may contact in magnetic tapes. The process is applicable to a starting CrO.sub.2 having good magnetic properties, i.e. a coercive force not lower than about 400 Oersted, a maximum magnetic induction B.sub.m not lower than about 2500 gauss, and a magnetic induction B.sub.r not lower than about 1600 gauss. The CrO.sub.2 is subjected to a heat treatment at a temperature ranging from 300.degree. to 390.degree. C. in the presence of a gas stream not exerting any oxidizing or reducing action on the compounds of trivalent, tetravalent and hexavalent chromium. Suitable gases are, for example, nitrogen, helium and argon.

摘要翻译： 本发明涉及一种稳定铁磁性二氧化铬相对于水和可磁化有机化合物的方法，它可以在磁带中接触。 该方法适用于具有良好磁特性，即不低于约400奥斯特的矫顽力，不低于约2500高斯的最大磁感应Bm和不低于约1600高斯的磁感应Br的起始CrO 2。 在不对三价，四价和六价铬的化合物施加任何氧化或还原作用的气流的存在下，在300℃至390℃的温度范围内对CrO 2进行热处理。 合适的气体是例如氮气，氦气和氩气。

公开(公告)号：US4244932A

公开(公告)日：1981-01-13

申请号：US57817

申请日：1979-07-16

申请人： Giampiero Basile ,  Giancarlo Boero

发明人： Giampiero Basile ,  Giancarlo Boero

IPC分类号： C01G49/02 ,  C01G37/027 ,  C01G49/00 ,  G11B5/706 ,  H01F1/11 ,  C01G37/02

CPC分类号： G11B5/70636 ,  Y10S428/90 ,  Y10T428/2991

摘要： A ferromagnetic chromium dioxide stabilized by coating the particles thereof with a stabilizing substance is disclosed, wherein the stabilizing substance consists essentially of an equimolecular mixture of Fe.sub.2 O.sub.3 and MnO or of a mixture of ferrite MeFe.sub.2 O.sub.4 with oxides Fe.sub.2 O.sub.3 and MeO, wherein Me represents Cu, Co, Zn or Mg and wherein the molar ratio Fe.sub.2 O.sub.3 /MeO is equal to 1, the quantity of the ferrite in the mixture being such as results from calcining, at temperature between 250.degree. and 350.degree. C., equimolecular quantities of Fe.sub.2 O.sub.3 and MeO. A process for obtaining the stabilized CrO.sub.2 is also disclosed wherein the CrO.sub.2 is dispersed in water and on it are co-precipitated Fe(OH).sub.3 and Mn(OH).sub.2 or Me(OH).sub.2 in stoichiometric quantities with respect to each other; after which the CrO.sub.2, in admixture with the hydroxides, is separated from the water, dried at a temperature not exceeding 100.degree. C. and then calcined at temperatures between 250.degree. and 350.degree. C.

摘要翻译： 公开了通过用稳定物质涂覆其颗粒来稳定的铁磁性二氧化铬，其中稳定物质基本上由Fe 2 O 3和MnO的等摩尔混合物或铁氧体MeFe 2 O 4与氧化物Fe 2 O 3和MeO的混合物组成，其中Me表示Cu，Co ，Zn或Mg，并且其中Fe 2 O 3 / MeO的摩尔比等于1，混合物中的铁素体的量由煅烧产生，在250-350℃的温度下，等分子量的Fe 2 O 3和MeO。 还公开了一种获得稳定化的CrO 2的方法，其中CrO 2分散在水中，并且以相对于彼此的化学计量的方式共沉淀Fe（OH）3和Mn（OH）2或Me（OH）2; 然后与氢氧化物混合的CrO 2与水分离，在不超过100℃的温度下干燥，然后在250-350℃的温度下煅烧。

公开(公告)号：US4169802A

公开(公告)日：1979-10-02

申请号：US893348

申请日：1978-04-04

申请人： Giampiero Basile ,  Elio Gallinotti ,  Giancarlo Boero

发明人： Giampiero Basile ,  Elio Gallinotti ,  Giancarlo Boero

IPC分类号： C01G37/027 ,  C01G37/02 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70636 ,  C01G37/02 ,  C01P2006/42 ,  C01P2006/80 ,  C01P2006/82 ,  Y10S428/90 ,  Y10T428/2993

摘要： The present invention concerns a stabilized ferromagnetic chromium dioxide and a process for obtaining the same. More particularly, the present invention relates to ferromagnetic chromium dioxide stabilized by means of the coating of its particles with a stabilizing substance, characterized in that the stabilizing substance is selected from the group consisting of a zinc, aluminum or chromium (III) polyphosphates having a high molar ratio phosphorus/metal and having, depending on the metal, the following formula: P.sub.2 O.sub.5.nZnO.mH.sub.2 O wherein "n" in general is comprised between 0.286 and 0.667 while "m" is generally comprised between 0 and 2.570;P.sub.2 o.sub.5.nAl.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.225 and 0.500, while "m" is generally comprised between 0 and 2.68;P.sub.2 o.sub.5.nCr.sub.2 O.sub.3.mH.sub.2 O wherein "n" is in general comprised between 0.143 and 0.333, while "m" is generally comprised between 0.002 and 2.46.

摘要翻译： 本发明涉及一种稳定的铁磁性二氧化铬及其制备方法。 更具体地，本发明涉及通过用稳定物质涂覆其颗粒而稳定的铁磁性二氧化铬，其特征在于稳定物质选自具有 高摩尔比的磷/金属，并且具有取决于金属的以下分子式：P 2 O 5·nZnO·mH 2 O，其中“n”通常在0.286和0.667之间，而“m”通常在0和2之间。

公开(公告)号：US5115026A

公开(公告)日：1992-05-19

申请号：US243830

申请日：1988-09-13

申请人： Mario Visca ,  Giancarlo Boero ,  Daria Lenti

发明人： Mario Visca ,  Giancarlo Boero ,  Daria Lenti

IPC分类号： C08J3/16 ,  C08F6/22 ,  C08J3/20 ,  C08J3/215 ,  C08L27/06 ,  C08L27/12 ,  C08L101/00

CPC分类号： C08J3/215 ,  C08F6/22

摘要： Process for the production of a composite material based on a polymer matrix comprising homogeneously dispersed therein an organic and/or inorganic filler, said process consisting in mixing together the aqueous dispersions of the single components, in which the dispersed particles of the dispersion have a surface charge of the same sign and "zeta potential" between 10 and 100 mV (in absolute value) and wherein the ratio (in absolute value) between the "zeta potentials" of the particles of each dispersion is between 0.2 and 5.

公开(公告)号：US4798854A

公开(公告)日：1989-01-17

申请号：US19255

申请日：1987-02-26

申请人： Mario Visca ,  Giancarlo Boero ,  Daria Lenti

发明人： Mario Visca ,  Giancarlo Boero ,  Daria Lenti

IPC分类号： C08J3/16 ,  C08F6/22 ,  C08J3/20 ,  C08J3/215 ,  C08L27/06 ,  C08L27/12 ,  C08L101/00 ,  C08J5/02 ,  C08K7/02

CPC分类号： C08J3/215 ,  C08F6/22

摘要： Process for the production of a composite material based on a polymer matrix comprising homogeneously dispersed therein an organic and/or inorganic filler, said process consisting in mixing together the aqueous dispersions of the single components, in which the dispersed particles of the dispersion have a surface charge of the same sign and a "zeta potential" between 10 and 100mV (in absolute value) and wherein the ratio (in absolute value) between the "zeta potentials" of the particles of each dispersion is between 0.2 and 5.

摘要翻译： 用于生产基于包含均匀分散有有机和/或无机填料的聚合物基质的复合材料的方法，所述方法包括将单一组分的水分散体混合在一起，其中分散体的分散颗粒具有表面 相同符号的电荷和10和100mV（绝对值）之间的“ζ电位”，并且其中每个分散体的颗粒的“ζ电位”之间的比率（绝对值）在0.2和5之间。