Abstract: A rapid prototyping method utilizing a powder sintering process and an apparatus for fabricating a product, utilizing the method. The rapid prototyping method includes steps of slicing an image of a product to be fabricated into a number of layers, preparing a mold sheet for each of the slices of the product with a cavity adapted to the profile of the corresponding slice, laying the mold sheet in place on a one-on-the-other basis, feeding the cavity of the mold sheet with a powdery material, pressurizing the material, repeating the preceding steps for each slide to form a multilayer structure for a complete product, and sintering the multilayer structure to produce a finished product. The rapid prototyping method according to the invention provides major advantages over comparable known methods in terms of cost, processing time, and profiling accuracy.

Abstract: As shown in FIG. 1, on a semiconductor substrate 20 formed in sequence are a second n-type clad layer 11, a first n-type clad layer 12, an n-type carrier blocking layer 13, an active layer 14, a p-type carrier blocking layer 15, a first p-type clad layer 16, a second p-type clad layer 17, a current constriction layer 18, and a p-type contact layer 19. The carrier blocking layers 13 and 15 are doped to a high doping concentration of more than 1.times.10.sup.18 cm.sup.-3. The first clad layers 12 and 16 and the second clad layers 11 and 17 are doped to a low doping concentration of less than 3.times.10.sup.17 cm.sup.-3. The p-type carrier blocking layer 15 is doped with carbon or magnesium which is low in the diffusivity. Accordingly, the carriers are successfully confined in the active layer 14 thus to suppress the internal loss and the electrical resistance, whereby a high-efficiency, high-output semiconductor laser device can be obtained.

Abstract: An optical recording medium having at least a recording layer and a reflective layer on a substrate. The recording layer contains a dipyrromethene metal chelate compound obtained from a dipyrromethene compound represented by the general formula (1) and a metal ion: ##STR1## wherein R.sup.1 to R.sup.7 are defined in the specification.

Abstract: Disclosed is a propylene polymer composition comprising (a) a propylene polymer, (b) an olefin type elastomer and (c) a polar group-containing olefin polymer composition obtained by heating (c-1) an olefin polymer containing a carboxyl group or an acid anhydrous group in its molecule and (c-2) an amino compound, each in a specific amount. Also disclosed is a propylene polymer composition comprising (a) a propylene polymer, (b) an olefin type elastomer, (c-1) an olefin polymer containing a carboxyl group or an acid anhydrous group in its molecule and (c-2) an amino compound, each in a specific amount. The propylene polymer compositions of the present invention are excellent in properties of being coated with various coatings.

Abstract: Dyes suitable for use in the fabrication of color filters are described which contain one or more photopolymerizable substituents preferably represented by the following formula:D-(A-Yn.sup.1)n.sup.2 (1)where D represents a chromophoric nucleus, A denotes a connecting group, Y means the photopolymerizable group, .sub.n.sup.1 is 1-10,000, and .sub.n.sup.2 stands for an integer of 1-10. Also described are photosensitive resist resin compositions containing the dyes as well as color filters fabricated by curing the photosensitive resist resin compositions.

Abstract: A solid titanium catalyst component ?Ia! containing magnesium, halogen, titanium and a compound having at least two ether linkags with a plurality of intermediately existing bonding atoms; a catalyst and a prepolymerized olefin-containing catalyst prepared by using the solid titanium catalyst component ?Ia!; a method for preparing a polyolefin wherein said catalyst or prepolymerized olefin containing catayst is used. A catalyst and a prepolymerized olefin containing catalyst prepared by using a solid titanium catalyst component ?Ib! containing magnesium, halogen, titanium and a specific electron donor (al), and a compound having at least two ether linkags with a plurality of intermediately existing bonding atoms; a method for preparing a polyolefin wherein said catalyst or prepolymerized olefin containing catayst is used.

Abstract: A porous film is here disclosed which is obtainable by stretching a film in at least uniaxial direction, said film being formed from a resin composition containing 25 to 70 parts by weight of a polyolefin resin and 75 to 30 parts by weight of an inorganic filler; said resin composition further containing 0.5 to 10 parts by weight of dehydrated castor oil (a) and 0.01 to 5 parts by weight of hardened castor oil (b) based on the total 100 parts by weight of the polyolefin resin and the inorganic filler; and the amount of the component (a) being 20 to 95% by weight based on the total amount of the components (a) and (b). In this porous film, softness and feeling like cloth, moisture vapor transmission, uniformity of the film thickness and the like are equal to their conventional levels. Furthermore, the adhesive strength of a securing tape does not deteriorate because the third components (a) and (b) do not float on the surface of the porous film.

Abstract: A zinc oxide fine particle-adhered composite material consists essentially of a substrate and zinc oxide fine particles adhered thereto. The composite material is characterized in that the zinc oxide fine particles deposited, from an aqueous medium, on the surface of the substrate are firmly adhered to the surface without using any binder and the zinc oxide fine particles are substantially exposed on the surface. The composite material is prepared by, for instance, a method which comprises the step of coming an aqueous suspension of zinc oxide fine particle in contact with a substrate to thus deposit the zinc oxide fine particles on the surface of the substrate. The composite material allows for the zinc oxide particles to sufficiently show their antibacterial, deodorizing, UV absorbing, photocatalytic, stain-proofing and purifying activities without any delay.

Abstract: A method for producing aryl alkyl hydroperoxides which comprises selectively oxidizing an aryl alkyl hydrocarbon having the formula: ##STR1## wherein P and Q are hydrogen or an alkyl and may be the same or different from each other; x is an integer of 1-3; and Ar is an aromatic hydrocarbon group having a valence of x, with an oxygen-containing gas in the presence of a transition metal complex which contains, as a ligand, a cyclic polyfunctional amine compound having at least three nitrogen atoms in the ring forming molecular chain or an open chain polyfunctional amine compound having at least three nitrogen atoms in the main chain of the molecule.

Abstract: A polymaleimide resin composition is herein disclosed which comprises an aromatic amino resin, a polymaleimide resin and a bifunctional crosslinking agent as components, and the bifunctional crosslinking agent is selected from the group consisting of an aliphatic diamine compound, a 2,4-diamino-S-triazine compound, a diisocyanate compound, an aliphatic diamine compound and a bismaleimide compound; and a laminate plate for a semiconductor substrate in which the polymaleimide resin composition is used is also disclosed. The thermosetting resin composition permits the preparation of prepregs and green sheets having excellent flexibility, so that the workability and the productivity of the laminate plates can remarkably be improved.

Abstract: An object of the invention is to provide a laser light generating apparatus capable of minimizing loss in a resonator to give a high efficiency of wavelength conversion. A resonator comprises two reflecting mirrors 1 and 2 arranged in linear relationship and a non-linear optical crystal 3 disposed in the resonator. The non-linear optical crystal 3 is formed in a trapezoid shape so that a pair of input and output sides opposite to each other are tilted with respect to the optical propagation axis. The fundamental laser light is introduced along the optical propagation axis into the optical resonator, converted to a second harmonic by the non-linear crystal 3, and released outside from the reflecting mirror 2. It is made possible to adjust the beam diameter and convergence angle of the laser light on the light incidence plane(Y-Z plane) when the laser light passes the input and output sides of the non-linear optical crystal 3.

Abstract: Provided by this invention are an acrylamide polymer which has a weight-average molecular weight (a) of from 1,500,000 to 10,000,000 and a weight-average inertial radius (b) of from 30 to 150 nm, the ratio (b)/(a) of the weight-average inertial radius (b) to the weight-average molecular weight (a) being 0.00004 or smaller; and an aqueous solution of an acrylamide polymer which solution has a polymer concentration ranging from 22 to 60%, a Brookfield viscosity at 25.degree. C. of 50,000 cps or smaller and a weight-average molecular weight of from 500,000 to 10,000,000. They are useful as paper strength agents.

Abstract: A method and apparatus is disclosed for ultrasonically welding at their edges a strip of their copper foil to a second strip of supporting metal, preferably aluminum or stainless steel having a thickness greater than the copper foil. The welded strips are subsequently sheared into panels for use in making printed circuit boards.

Abstract: A cathodic active material comprises a mixture of graphite particles and electrolytic manganese dioxide particles which are composed of needle-like crystals having an aspect ratio ranging from about 2 to about 20 and an alkaline manganese dioxide cell is provided with a cathode prepared from the cathodic active material. The cathodic active material for dry cells can be prepared by mixing, in advance, carbon powder with manganese dioxide powder in a weight ratio ranging from about 1:100 to about 15:100 and then pulverizing the resulting mixture. The novel cathodic active material for dry cells permits substantial improvement of the resulting dry cell in the high load-discharge quality.

Abstract: A powered closing device for a vehicle door comprises a latch engageable with a striker, a ratchet for maintaining the engagement between the latch and the striker, an output member rotated by a motor when the latch comes into a half-latched position, an intermediate lever connected to the latch for displacing the latch from the half-latched position to a full-latched position, a connecting member provided between the output member and the intermediate lever, a cancelling lever having a first arm connected to an opening handle of the door and a second arm in which a cancelling cam surface is formed. The cancelling cam surface is brought into contact with the connecting member to disconnect the output member and the intermediate lever when the opening handle is operated. The cancelling cam surface is overlapped with the output member when the opening handle is not operated and moved in a direction apart from the first shaft when the opening handle is operated.

Abstract: The present invention relates to a process for producing a polyolefin having a functional group at its terminal and the object thereof is to provide a process in which the above polyolefin can be obtained with industrial advantages. This object can be attained by the process comprising step (A) producing a terminal-modified polyolefin of the formula P-AlR.sup.1 R.sup.2, wherein P is a polymer chain and each of R.sup.1 and R.sup.2 is, for example, a hydrocarbon group having 1 to 10 carbon atoms, in the presence of an olefin polymerization catalyst composed of a solid titanium catalyst component (a) and an organoaluminum compound catalyst component (b) optionally together with an organosilicon compound (c) and step (B) producing a polyoiefin of the formula P-X, wherein P is as defined above and X is a functional group, by conducting a substitution reaction between -AlR.sup.1 R.sup.

Abstract: A high-performance prepolymerized solid catalyst is prepared by polymerizing an olefin onto an olefin polymerization catalyst in a heterogeneous system under irradiation with an elastic wave, wherein the olefin is prepolymerized in an amount of not less than 0.1 g based on 1 mmol of a transition metal contained in the olefin polymerization catalyst. The elastic wave is preferably an ultrasonic wave.

Abstract: Cerium oxide ultrafine particles consist essentially of cerium oxide single crystal grains having a grain size ranging from 10 to 80 nm and the cerium oxide ultrafine particles can be prepared by a method which comprises the steps of mixing, with stirring, an aqueous solution of cerous nitrate with a base in such a mixing ratio that the pH value of the mixture ranges from 5 to 10, then rapidly heating the resulting mixture up to a temperature of 70 to 100.degree. C. and maturing the mixture at that temperature. The cerium oxide ultrafine particles not only have an average particle size ranging from 10 to 80 nm, but also are uniform in the particle size and in the shape.

Abstract: Disclosed is a process for preparing a solid titanium catalyst component, comprising contacting (a) a liquid magnesium compound, (b) a liquid titanium compound, (c) an electron donor and (d) a solid divalent metallic halide. In this process, the solid divalent metallic halide is one having a crystalline structure of the cadmium chloride type. The contact of the component (a) with the component (b) is preferably carried out in the presence of the solid divalent metallic halide (d). According to this process, there can be obtained a solid titanium catalyst component capable of polymerizing olefins with an extremely high activity and capable of producing polyolefins of high stereoregularity when .alpha.-olefins of 3 or more carbon atoms are polymerized.

Abstract: The present invention provides lubricant oil compositions comprising a polyalkylene glycol carbonate. The lubricant oil compositions are useful for industrial gear oil, automotive gear oil, and lubricant oil for refrigerators, rolling installations and fibers, which are excellent in lubricating properties and detergency. The present invention also relates to lubricant oil compositions which comprise a polyalkylene glycol polycarbonate having mutual solubility with an ozone layer-nondestructive Freon such as Freon R-134a, and which are accordingly especially suited for refrigerators using hydrogenated fluorocarbon as a refrigerant. A polyalkylene glycol carbonate according to the invention comprises a polyoxypropylene group in the molecular chain and an alkyl group and an alkyloxyalkylene group at the molecular terminals.