摘要:
The present invention relates to an ultrahigh-molecular-weight ethylene copolymer powder having an intrinsic viscosity (η) of 10 dl/g to 34 dl/g, obtainable by copolymerizing ethylene and at least one olefin selected from the group consisting of α-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH2═CHR1 wherein R1 is an aryl group having 6 to 20 carbon atoms, and linear, branched or cyclic dienes having 4 to 20 carbon atoms, wherein (1) a molded article of the copolymer powder has a haze of from 30% to 80% and (2) the copolymer powder has a bulk density of from 0.35 g/cm3 to 0.60 g/cm3. According to the invention, there can be provided an ultrahigh-molecular-weight ethylene copolymer powder which is excellent in balance of abrasion properties, physical properties, and moldability and also excellent in transparency and flexibility as compared with conventional ultrahigh-molecular-weight polyethylene and which has a high bulk density.
摘要翻译:本发明涉及一种超高分子量乙烯共聚物粉末,其特性粘度(η)为10dl / g至34dl / g,可通过使乙烯和至少一种选自下组的烯烃共聚获得:α-烯烃 具有3至20个碳原子,具有3至20个碳原子的环烯烃,由式CH 2 -CHR 1表示的化合物,其中R 1, 是碳原子数6〜20的芳基和碳原子数4〜20的直链状,支链状或环状的二烯,其中,(1)共聚物粉末的成型体的雾度为30〜80%,(2) 共聚物粉末的堆积密度为0.35g / cm 3至0.60g / cm 3。 根据本发明,可以提供与常规超高分子量聚乙烯相比,其耐磨性,物理性能和成型性的平衡优异,透明性和柔软性优异的超高分子量乙烯共聚物粉末, 其堆积密度高。
摘要:
This invention discloses electrophotogrpahic toners and the methods for their preparation. The electrophotographic toners contain resin and coloring agents as primary components. The resin is a non-crosslinked polymer of vinyl monomers or its mixtures, and has a number average molecular weight (Mn) of 2,000-15,000, a Z average molecular weight (Mz) of not less than 400,000 and Mz/Mn of 50-600. The electrophotographic toners exert an excellent fixing ability at high duplication speed or at lower temperatures.
摘要:
An organic silicon-terminated polyimide precursor having a very stable solution viscosity is produced by polycondensing 100 parts by weight of a mixture composed of 90 to 99.5% by mole of an organic diamine represented by the following general formula (I) and 10 to 0.5% by weight by mole of an organic silyl represented by the following general formula (II): ##STR1## wherein R.sup.1 and R.sup.2 are divalent organic groups; R.sup.3 and R.sup.4 are monovalent organic groups; m is 0, 1, 2, or 3, with an organic tetracarboxylic acid dianhydride represented by the following general formula (III) in a molar amount corresponding to the 100 parts by weight of the mixture of the organic diamine and the organic silyl represented by the said general formulae (I) and (II), respectively, in an organic polar solvent at 0.degree. to 40.degree. C., thereby obtaining a solution of organic silicon-terminated polyimide precursor, and heating the solution at 50.degree. to 80.degree. C.: ##STR2## wherein R.sup.5 is a tetravelent organic group. The polyimide having good adhesion and mechanical characteristics is obtained by further heating the precursor solution at 100.degree. to 450.degree. C.
摘要:
The present invention relates to an ultrahigh molecular weight ethylene polymer which is either an ethylene homopolymer (A) or an ethylene copolymer (B), the ethylene copolymer (B) being obtained by copolymerizing a) 99.9 to 75.0% by weight of ethylene and b) 0.1 to 25.0% by weight of a comonomer which is at least one olefin selected from the group consisting of α-olefins having 3 to 20 carbon atoms, cyclic olefins having 3 to 20 carbon atoms, compounds represented by the formula CH2═CHR (in which R is an aryl group having 6 to 20 carbon atoms) and linear, branched or cyclic dienes having 4 to 20 carbon atoms, the ethylene polymer having i) a viscosity average molecular weight of 1 million or more ii) a molecular weight distribution (Mw/Mn) of more than 3 and iii) a Ti content of not more than 3 ppm and a Cl content of 5 ppm in the polymer.
摘要:
A novel olefin polymerization catalyst comprising: (A) a transition metal compound comprising a transition metal having &eegr;-bonded thereto a cyclic anionic ligand; (B) a mixture of (B-1) an activator compound capable of forming, together with component (A), a metal complex having a catalytic activity and (B-2) an organometal compound, the activator compound (B-1) comprising a cation and a noncoordinating, compatible anion; (C) a solid component; and optionally (D) an organoaluminum compound, wherein the catalyst is obtained by contacting components (A) to (C) and optionally component (D). The olefin polymerization catalyst of the present invention is advantageous not only in that it has high polymerization activity, but also in that an olefin polymer having excellent powder characteristics can be efficiently produced by suspension polymerization (slurry polymerization) or gaseous phase polymerization in a continuous manner, using a commercial scale plant, while preventing the occurrence of adherence of the polymer to the inside surfaces associated with a polymerizer.
摘要:
This invention discloses electrophotographic toners and the methods for their preparation. The electrophotographic toners contain resin and coloring agents as primary components. The resin is a non-crosslinked polymer of vinyl monomers or its mixtures, and has a number average molecular weight (Mn) of 2,000-15,000, a Z average molecular weight (Mz) of not less than 400,000 and Mz/Mn of 50-600. The electrophotographic toners exert an excellent fixing ability at high duplication speed or at lower temperatures.
摘要:
A method for forming conductor layers of substrates for mounting LSIs and the like and a fabrication method of multilayer substrates are disclosed. These methods comprise steps of forming a metal underlayer having a shape similar to that of a conductor pattern on the substrate, forming an insulation layer over portions of the substrate which are not covered by the metal underlayer, and disposing a plating layer on the metal underlayer by carrying out electroless plating while using the insulation layer as the resist and thereby forming conductors. As compared with a conventional conductor layer forming method, the number of fabrication steps is reduced. And the elimination of the surface grinding step facilitates the fabrication.
摘要:
This invention relates to a method wherein the setting angles of cooling water jetting orifices an outer quenching head and an inner quenching head are made 30.degree..+-.10.degree. in the pipe advancing direction with the pipe axis and the number of jetting orifices of the inner quenching head are greater for purposes of higher density for the front one-third of the length of the head and lower for purposes of lower density for the rear two-thirds of the length of the head.Further, the first contact point of inner quenching water within the inner surface of the pipe is so set as to be delayed by 20 to 150mm. from the first contact point of quenching water with the outer surface of the pipe, the outer quenching being carried out when the steel pipe heating temperature is above the A.sub.3 transformation point and the inner quenching is carried out when the temperature of the inner surface of the pipe is just below the A.sub.1 transformation point.As both heads have a fixed angle, water or steam will not enter the unquenched part and the quenching velocity and the hardness of the cross-section of the steel pipe will be improved.
摘要:
The rotating electrical machine of the present invention includes: a magnet holder made of a non-magnetic material, which is formed by coupling a columnar portion for retaining the permanent magnet in a circumferential direction, and an annular portion for covering each axial side surface of the permanent magnet. The magnet holder includes, on an outer diameter side of both circumferential side surfaces of the columnar portion, engaging portions which engage with respective locking portions of the magnet cover, and includes, on an inner diameter side of each of both the circumferential side surfaces of the columnar portion, an extending portion extending along an inner peripheral surface of the magnet cover with a clearance (D) with respect to the inner peripheral surface of the magnet cover.
摘要:
To construct an underground structure having smooth wall surfaces in a simple, safe and reliable way, plates (11,12) are buried in parallel, and soil and sand (G1) between the plates is removed. If the places where the plates are to be buried are loosened in advance, they can be buried more easily. A strut member (14) is interposed between the plates, which are used as both forms and sheathing. A hollow body, together with steel plates arranged on both sides of the hollow body, is buried into the ground, the bottom of the hollow body is closed with a shutter, the hollow body is drawn up together with soil in it, leaving the steel plates in the ground, and the remaining steel plates are used as both forms and sheathing. Reinforcement bars are disposed in the groove space thereby formed, and concrete is poured to build an underground structure.