摘要:
A solid catalyst component for olefin polymerization superior in shatter resistance and narrowness of particle size distribution, is provided, which component is prepared by spraying a mixture of Mg compound with an alcohol in a molten state, in a column; cooling the inside of the column; to obtain a component (B); partly removing the alcohol from (B), to obtain a solid component (C); contacting a halogen-containing Ti compound and an electron donor with (C); to obtain (D); contacting (D) with a halogen-containing Ti compound; in the above process, specifying the composition formulas of (A), (B) and (C); specifying the X-ray diffraction spector of (C) in comparison of that of (B); and contacting (C) with a halogen-containing Ti compound and an electron donor using an aliphatic hydrocarbon of a specified b.p., in a specified temperature.
摘要:
In the setting operation conducted by the handle 90 which is an operating section, an upper portion of the portion 26a′ of the slidable T-post 26 is pushed by the end portion of the cam 90b, and the slidable T-post 26 is moved. In accordance with the movement of the card 26, the suction cup block 23 is elastically deformed, and the suction cup 23b is held by the body 24 by a holding force of the suction cup 23b. The body 24 is composed of a porous body, and air flows from the ventilation hole 29 into a space formed between the suction cup 23b and the body 24, via the body 24. The slidable T-post 26 is biased ahead by the return spring 27. When the releasing operation is conducted by the handle 90, the cam 90b is rotated, and the end portion of the cam 90b is separated from the end of the portion 26a′ to be pushed. After that, when the intensity of the holding force of the suction cup 23b to the body 24 is decreased lower than that of the spring force of the return spring 27, the slidable T-post 26 is moved ahead, so that the card member 26c pushes up the movable contactor 70.
摘要:
An olefin (co)polymer composition of the present invention comprises 99 to 70 wt. % of olefin (co)polymer (I) and 1 to 30 wt. % of polyethylene-based polymer (II). The olefin (co)polymer (I) comprises 0.01 to 5.0 parts by weight of high molecular weight polyethylene (a) having an intrinsic viscosity &eegr;A measured in tetralin at 135° C. of 15 to 100 dl/g, which is an ethylene homopolymer or an ethylene-olefin copolymer comprising at least 50 wt. % of ethylene polymerization units, and 100 parts by weight of olefin (co)polymer (b) other than the high molecular weight polyethylene. The polyethylene-based polymer (II) has an intrinsic viscosity &eegr;II measured in tetralin at 135° C. of 0.10 to 10 dl/g, which is an ethylene homopolymer or an ethylene copolymer comprising at least 50 wt. % of ethylene polymerization units. Thus, the present invention provides a polypropylene-based olefin (co)polymer composition having excellent formability that is suitable for thermoforming such as vacuum forming and pressure forming, blow molding and foam molding, especially suitable for thermoforming.
摘要:
A solid catalyst component for olefin polymerization superior in shatter resistance and narrowness of particle size distribution, is provided,which component is prepared byspraying a mixture of Mg compound with an alcohol in a molten state, in a column; cooling the inside of the column; to obtain a component (B); partly removing the alcohol from (B), to obtain a solid component (C); contacting a halogen-containing Ti compound and an electron donor with (C); to obtain (D); contacting (D) with a halogen-containing Ti compound;in the above process,specifying the composition formulas of (A), (B) and (C); specifying the X-ray diffraction spector of (C) in comparison of that of (B); and contacting (C) with a halogen-containing Ti compound and an electron donor using an aliphatic hydrocarbon of a specified b.p., in a specified temperature.
摘要:
In a magnetooptical reproducing apparatus and method, data recorded in a first layer of a magnetooptical recording medium is transcribed to a second layer by a reproduction magnetic field and is optically reproduced from the second layer.
摘要:
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state, in which the temperature of the medium surface becomes a predetermined temperature, to an intensity P.sub.W1 higher than P.sub.pre, and after P.sub.W1 is maintained for a time T.sub.W1, the intensity is reduced to an intensity P.sub.W2 lower than P.sub.W1 to form a mark on the optical recording medium. P.sub.W2 is controlled so that the medium temperature at a peak temperature position or a spot center position of the laser beam radiated onto the medium surface after an elapse of the time T.sub.W1 becomes constant even after the intensity is reduced to P.sub.W2, and at least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to establish the pre-heat condition within a time period until the intensity is raised to P.sub.W1 again so as to form the next mark.
摘要:
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto an optical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state, in which the temperature of the medium surface becomes a predetermined temperature, to an intensity P.sub.W1 higher than P.sub.pre, and after P.sub.W1 is maintained for a time T.sub.W1, the intensity is reduced to an intensity P.sub.W2 lower than P.sub.W1 to form a mark on the optical recording medium. P.sub.W2 is controlled so that the medium temperature at a peak temperature position or a spot center position of the laser beam radiated onto the medium surface after an elapse of the time T.sub.W1 becomes constant even after the intensity is reduced to P.sub.W2, and at least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to establish the pre-heat condition within a time period until the intensity is raised to P.sub.W1 again so as to form the next mark.
摘要:
A process for producing a modified polypropylene having a very high melt tension and superior stiffness and moldability, and a molded product obtained by using the modified polypropylene are provided.which process includes adding 0.05 to 10 millimols of a cross-linking auxiliary to 100 g of a linear polypropylene, mixing them, irradiating ionizing radiations to the mixture so as to give an absorbed dosage of 1 to 20 kGy, and successively heat-treating the resulting material at 80.degree. to 350.degree. C.,which modified polypropylene has(A) a degree of branching of substantially 1,(B) a relationship between its melt tension (MS) at 230.degree. C. and its intrinsic viscosity (.eta.) measured in tetralin at 230.degree. C. expressed by an inequalitylog (MS)>4.24.times.log [.eta.]-0.915, and(C) a percentage of extraction residue in boiling xylene of 1% by weight or less.
摘要:
In an optical recording method and apparatus, the intensity of a laser beam to be radiated onto a magnetooptical recording medium is raised from an intensity P.sub.pre for maintaining a pre-heat state, in which the temperature on the medium surface has a predetermined temperature .THETA..sub.pre, to an intensity P.sub.W1 higher than P.sub.pre so as to form a mark on the medium, the intensity is reduced to an intensity P.sub.LB lower than P.sub.pre, and after an elapse of a time T.sub.off, the intensity is raised to P.sub.pre. At least one of P.sub.pre, T.sub.off, and P.sub.LB is controlled to achieve the pre-heat state within a time period until the intensity is raised to P.sub.W1 again to form the next mark.
摘要翻译:在光记录方法和装置中,将辐射到磁光记录介质上的激光束的强度从用于维持预热状态的强度Ppre升高,其中介质表面上的温度具有预定温度THETA pre 对于高于Ppre的强度PW1,以便在介质上形成标记,强度降低到低于Ppre的强度PLB,并且在经过时间Toff之后,将强度提高到Ppre。 控制Ppre,Toff和PLB中的至少一个以在一段时间内实现预热状态,直到强度再次升高到PW1以形成下一个标记。
摘要:
A magnetooptical recording method for recording data using a bit having upward-magnetization and a bit having downward-magnetization on a recording layer of a magnetooptical recording medium comprises the steps of using, as the medium, a multilayered magnetic recording medium consisting of a first layer having a perpendicular magnetic anisotropy acting as a recording layer, and a second layer having a perpendicular magnetic anisotropy acting as a reference layer; moving the medium; applying an initial field so that, before recording, the direction of magnetization of the recording layer is left unchanged, and that of the reference layer is aligned either upward or downward; radiating a laser beam onto the medium; pulse modulating an intensity of the laser beam in accordance with binary data to be recorded; when the laser beam is radiated, applying a bias field to the irradiated portion; and when the intensity of the pulse-modulated laser beam is at high level, forming one of the bit having upward-magnetization and that having downward-magnetization, and when the intensity of the pulse-modulated laser beam is at low level, forming the other bit.