Abstract: The polycarbonates of the present invention include those of sucrose series having a specific cyclic structure, those of oligosaccharide and monosaccharide series other than the sucrose series, those derived from specific saccharides having no cyclic structure, those having a skeletal structure of pentaerythritol, neopentyl glycol or trimethylolmethane, and specific dicarbonates.The lubricating oil and electrical insulating oil of the invention contain the above-mentioned polycarbonates.The polycarbonates of the invention are excellent in compatibility with Freon R-134a (HFC) as well as in lubricating properties, detergency and electrical insulating properties, and are capable of providing lubricating oil for refrigerator, automotive engine oil, automotive gear oil, lubricating oil for rolling and lubricating oil for fiber, especially lubricating oil for which electrical insulating properties are required, and electrical insulating oil.

Abstract: In accordance with the present invention, there are provided carboxylate compounds and liquid compositions thereof represented by the following formula (A) ##STR1## wherein R.sup.1 represents one group selected from the group consisting of alkyl group having 6 to 18 carbon atoms, alkoxy group having 6 to 18 carbon atoms and halogenated alkyl group of 6 to 18 carbon atoms, C* represents an asymmetric carbon atom, and R.sup.2 represents a group represented by the following formula (A)--(CH.sub.2).sub.m --CH.sub.3 or (B)--(CH.sub.2).sub.n --COOR.sub.3 wherein m represents an integer of 2 to 6, n represents an integer of 0 to 5, and R.sup.3 represents alkyl group having 1 to 10 carbon atoms.

Abstract: The ethylene/.alpha.-olefin/7-methyl-1,6-octadiene copolymer rubber of the invention is a random copolymer rubber prepared using a Group IVB transition metal type catalyst containing a specific zirconium catalyst component, and in this copolymer rubber, a molar ratio of ethylene to .alpha.-olefin, a diene content, an intrinsic viscosity [.eta.], an intensity ratio D of T.alpha..beta. to T.alpha..alpha. in a .sup.13 C-NMR spectrum of said copolymer rubber, a B value which is a measure of distribution of each monomer and a glass transition temperature are all within specific ranges. The rubber composition of the invention comprises the above-mentioned random copolymer rubber and a conjugated diene rubber. The random copolymer rubber has high stereoregularity, narrow composition distribution and excellent low-temperature flexibility, and shows extremely high covulcanizability with the conjugated diene rubber.

Abstract: A process for preparing a composite foamed molded article according to the invention includes the steps of setting a skin material in the vicinity of an upper mold for stamping-mold kept at a temperature of 10 to 50.degree. C.; feeding a molten polypropylene resin composition for a substrate containing a foaming agent kept at a temperature of not lower than a decomposition temperature of the foaming agent and within the range of 180 to 240.degree. C. onto a surface of a lower mold for stamping-mold kept at a temperature of 30 to 80.degree. C.; closing the mold within 10 seconds after feeding of the composition to clamp the molds at a pressure of 20 to 70 kg/cm.sup.2 ; lifting the upper mold before a thickness of each of hardened layers formed on both surfaces of the composition layer reaches 1.0 mm to open the mold at a distance between the upper mold and lower mold of 1.

Abstract: A laser irradiation nozzle free from clogging, adhesion of metal oxides, directional gas blowing, and oxidation occurring on the weld; yet capable of providing sound bead morphology and a stable weld depth on a workpiece. Accordingly, the laser irradiation nozzle comprises a conical outside nozzle and a conical inside nozzle being arranged as such to give a concentric ring-shaped top, having an assist gas outlet being established between the inside and the outside nozzles, wherein, the distance h between the laser beam focal position on the workpiece and said irradiation nozzle is controlled to a predetermined value, and the ratio of the cross sectional area of the assist gas outlet being as defined between the outside and the inside nozzles to the cross sectional area of the inside concentrical ring defined by the outer diameter of said ring on the nozzle top is also controlled to a predetermined value.

Abstract: The method includes the steps of feeding a polymer to an extruder where the polymer is melted, metering the molten polymer from the extruder to a tubular pyrolysis reactor through metering means connected to the extruder, and pyrolytically decomposing the polymer in the tubular pyrolysis reactor in the presence of a higher fatty acid, and/or a hydrochloric acid acceptor.

Abstract: Proposed herein is a process for preparing thermoplastic elastomers, which comprises dynamically heat treating polymer particles together with a crosslinking agent, each of the polymer particles being composed of a portion comprising a crystalline olefin polymer and portions comprising an amorphous olefin polymer, the polymer particles having an average particle diameter of at least 10 .mu.m and an apparent bulk density of at least 0.2 g/ml.

Abstract: The present invention relates to a novel ethylene/pentene-1 copolymer whose molded film has a good balance between impact resistance and tear properties and high transparency, also is prominently reduced in a variation of the transparency even after subjected to a heat treatment, and further shows high blocking resistance, provided that the copolymer fulfills specific requisites. The invention also relates to a process for the preparation of the above-mentioned ethylene/pentene-1 copolymer and a formulation of the ethylene/pentene-1 copolymer composition using a stabilizer. According to the invention, there can be obtained an ethylene/pentene-1 copolymer composition which is excellent in heat stability in the molding stage, long-term heat stability and weatherability.

Abstract: A method of manufacture of an ultra-high molecular weight polyethylene thin-wall pipe which is uniform in thickness and free from a folded mark. The ultra-high molecular weight polyethylene thin-wall pipe is manufactured by supplying ultra-high molecular weight polyethylene into and melting and kneading, continuously extruding the molten substance of the ultra-high molecular weight polyethylene from a die connected to a screw of the screw extruder to form a cylindrical roughly shaped article, and diametrically expanding the cylindrical roughly extruded article by means of a tapered core and taking up.

Abstract: An information recording medium formed by adhering, with an adhesive composition, two disk substrates to each other, at least one of the two disk substrates having a recording layer on at least one surface of a transparent resin substrate thereof and the adhesive composition comprising(1) the following components:(A) an .alpha.-olefin polymer,(B) an ethylene/(meth)acrylate copolymer,(C) a styrene-type polymer, and(D) a tackifierprovided that at least one of the components (A) to (D) is modified with an unsaturated carboxylic acid or a derivative thereof, or(2) the following components:(A) an .alpha.-olefin polymer,(C) a styrene-type polymer,(D) a tackifier, and(E) fine filler particles.

Abstract: An oligomerization catalyst for .alpha.-olefins, comprising[A] at least one nickel compound selected from the group consisting of a nickel salt of organic acid, a nickel salt of inorganic acid and a complex compound of nickel;[B] an organoaluminum oxy-compound having at least 3 aluminum atoms in the molecule; and[C] a trivalent phosphorous compound represented by the general formula PR.sup.1 R.sup.2 R.sup.3 wherein R.sup.1 to R.sup.3 are each independently a hydrocarbon group or substituted hydrocarbon group of 1 to 10 carbon atoms.A process for oligomerizing .alpha.-olefin, wherein .alpha.-olefin is oligomerized in the presence of the catalyst mentioned above.

Abstract: A dental or surgical adhesive filler containing (a) a polymerizable acrylic acid or methacrylic acid derivative, (b) a vinyl polymer powder, (c) an organic boron compound as a curing agent, and optionally, a polar organic compound and an inert diluent. The advantage of the above dental or surgical adhesive filler is that it is easy to handle due to stability in curing time and freedom of ignition.

Abstract: A heat seal material having a plurality of resin surfaces which are positioned face to face and can be heat-fused together, at least one of the resin surfaces being formed of a resin composition comprising(A) 30 to 85% by weight of low-density polyethylene having a density of 0.91 to 0.94 g/cm.sup.3 and a crystallinity of more than 40%,(B) 5 to 40% by weight of polypropylene, and(C) 10 to 40% by weight of a low-crystalline or substantially amorphous ethylene/alpha-olefin copolymer.

Abstract: The present invention discloses a polyolefin resin composition comprising a specific cycloolefin-based polymer (a), a graft-modified elastomer (b) and a compound (c) having one amino group in the molecule, and containing, based on the total amount of the components (a), (b) and (c), 50 to 95% by weight of the component (a), 1 to 50% by weight of the component (b) and 0.01 to 45% by weight of the component (c). This polyolefin resin composition is improved particularly in mechanical properties such as impact strength, etc., while retaining excellent properties of the cycloolefin-based polymer (a).

Abstract: Disclosed is a heat-resistant rubber composition comprising (A) 100 parts by weight of an ethylene/.alpha.-olefin copolymer or a modified ethylene/.alpha.-olefin copolymer formed by graft-copolymerization with at least one compound selected from the group consisting of unsaturated carboxylic acids and anhydrides and esters thereof, and (B) (i) 10 to 100 parts by weight of a silica type filler which has been treated with a silane compound represented by the following formula: ##STR1## wherein R.sup.1 stands for an alkenyl group, a chloroalkenyl group or a chloroalkyl group, and R.sup.2 stands for a lower alkyl group, or (ii) a combination of 10 to 100 parts by weight of said silane-treated silica type filler or an untreated silica type filler and 0.5 to 30 parts by weight of a polyorganosiloxane having an average composition represented by the following formula:(R.sup.3).sub.a (R.sup.4).sub.b SiO.sub.(4-a-b)/2 (II)wherein R.sup.3 stands for a monovalent saturated or unsaturated hydrocarbon group, R.sup.

Abstract: A process for preparing a laminate by coating the surfaces of a metal substrate that has been treated with an anchor coating agent, with a modified olefin type resin and heat-adhering the olefin resin onto the surfaces of the metal substrate. The process of this invention is characterized by applying heat-treatment to the laminate at the time of adhesion or after the adhesion in the presence of a treating agent which consists of a compound prescribed in the general formulae (1) and (2). ##STR1## The laminate prepared by this process withstands deterioration of adhesion caused by aging, particularly in an atmosphere where water is present.

Abstract: A rubber composition containing (A) 100 parts by weight of an amorphous or low-crystalline ethylene-.alpha.-olefin copolymer rubber having an ethylene content of 70 to 90 mole %, a molecular weight distribution (Mw/Mn) of 3.0 or more and a Mooney viscosity ML.sub.1+4 (100.degree. C.) of 5 to 80; and (B) 1 to 120 parts by weight of a liquid ethylene-.alpha.-olefin random copolymer having an ethylene content of 40 to 90 mole % and an intrinsic viscosity [.eta.] of 0.01 to 0.4 dl/g as measured in decalin at 135.degree. C.

Abstract: Bulky split fibers having bond strength are produced by preparing a composite synthetic resin film of three layer structure having a polypropylene layer formed of a polypropylene/polyethylene blend and a polyethylene layer on either surface of the polypropylene layer, slitting and stretching the composite film to thereby form stretched tapes, and causing splitting of the stretched tapes for fibrillation. An integral article is prepared from the resultant split fibers by mixing them alone or with plant fibers and then heating at a temperature between the melting points of polyethylene and polypropylene, thereby integrating together the split fibers with each other or with the plant fibers.

Abstract: In accordance with the present invention, there are provided cycloolefin random copolymers composed of ethylene and cycloolefin and containing substantially no polyethylene, and processes for preparing the same. Optical disc substrates prepared from the above-mentioned copolymers are excellent in transparency and also capable of minimizing the occurence of errors in reading of the discs due to quality of the substrates used therefor.

Abstract: According to the present invention, a process which comprises bringing polyethylene terephthalate having an intrinsic viscosity of at least 0.50 dl/g and a density of 1.38 g/cm.sup.3 or more into contact with water is provided.In the water-treated polyethylene terephthalate obtained in the present invention, amounts of oligomers and acetaldehyde formed at the time of molding said polyethylene terephthalate into molded articles are small, and the contamination of the mold therewith is difficult to occur and further the contents of said molded articles does not change in flavor and fragrance.