Abstract: A substantially syndiotactic propylene copolymer which comprises propylene and at least one cyclic diolefin having 6 to 25 carbon atoms or an alkadiene having 6 to 25 carbon atoms and at least one terminal double bond, in the .sup.13 C-NMR spectrum of the copolymer measured in a 1,2,4-trichlorobenzene solution, a peak intensity observed at about 20.2 ppm as the reference of tetramethylsilane at 0.0 ppm being 0.5 or more of the total peak intensity attributed to methyl groups of propylene; the content of the cyclic diolefin or the alkadiene being from 0.01 to 20 mol %; the intrinsic viscosity [.eta.] of the copolymer measured in a tetralin solution at 135.degree. C. being from 0.1 to 10 dl/g.This copolymer can contain an .alpha.-olefin other than propylene, particularly ethylene.

Abstract: A process for the dimerization of n-butene wherein a Ziegler catalyst system composed of a nickel compound and an organoalkylaluminum is added, as a third component, with an amine and/or a quaternary ammonium chloride. The amine can be a primary, secondary or tertiary amine. This process makes it possible to selectively prepare isooctene having a low degree of branching while maintaining high catalytic activity.

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.

Abstract: A method for preparing an unsaturated compound mainly comprising monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins comprises coming a mixed gas which comprises paraffins and oxygen, or paraffins, oxygen and ammonia in contact with a catalyst which comprises (1) an oxide of phosphorus and (2) at least one oxide selected from the group consisting of indium oxide and tin oxide or comprises, in addition to the foregoing catalytic components, (3) at least one oxide selected from the group consisting of vanadium oxide, tungsten oxide and molybdenum oxide. The method makes it possible to prepare monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins in high yield and high selectivity from cheap starting materials, parafins.

Abstract: Disclosed are novel fluoran compounds represented by the formula (I): ##STR1## wherein R.sub.1 and R.sub.2 are different groups selected from cyclohexyl, n-butyl and isobutyl, e.g., in the form of crystals characterized by a specific X-ray diffraction diagram; crystalline toluene adducts thereof; and recording materials containing these fluoran compounds.

Abstract: The present invention provides a method capable of lining a multibranch piping with a coating material within the pot life of the coating material without leaving an area uncoated or having to apply excessive repeated coatings. Lining of a main pipe is performed by pouring the coating material into the main pipe from an end portion of the pipe, and the lining of branch pipes is effected by the feed of the coating material and air for each of the branch pipes. A completed time point of lining in each branch pipe is detected by any one of the following methods:(A) A method wherein the time required for lining a branch pipe is estimated in advance and upon lapse of the estimated time it is determined that the lining of the branch pipe was completed.

Abstract: By screening an animal cell transformant, which has been obtained by introducing into wild-type animal cells a wild-type DHFR gene and a structural gene which codes a desired useful substance, with a medium containing methotrexate (MTX) at a concentration of 50 .mu.M or lower, both genes can be amplified effectively within an MTX resistant strain and a stable amplified transformant can also be obtained. The screening may be repeated using an increasing concentration of MTX. It is also possible to obtain stably the desired foreign gene product in a high yield by using the thus-obtained amplified transformant.

Abstract: Herein disclosed are novel imidazolidine derivatives of the formula (I) and intermediates of the formula (II) ##STR1## wherein each R represents a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms, a halogen atom, an alkoxy group having from 1 to 6 carbon atoms, a methylenedioxy group, an alkylthio group having from 1 to 4 carbon atoms, a haloalkyl group having from 1 to 2 carbon atoms, a haloalkoxy group having from 1 to 4 carbon atoms, an alkylcarbonyl group having from 1 to 6 carbon atoms, an alkoxycarbonyl.group having from 1 to 6 carbon atoms, a hydroxy group, a cyano group, a nitro group, an alkylamino group having from 1 to 8 carbon atoms, a phenyl group, a phenoxy group, a benzyl group or a halopyridylmethyloxy group, and n is an integer of from 1 to 3, ##STR2## wherein R and n have, respectively, the same meanings as defined above. Processes for preparing the compounds of the formulas (I) and (II) are also described.

Abstract: A method for preparing an unsaturated compound mainly comprising monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins comprises coming a mixed gas which comprises paraffins and oxygen, or paraffins, oxygen and ammonia in contact with a catalyst which comprises (1) an oxide of phosphorus and (2) at least one oxide selected from the group consisting of indium oxide and tin oxide or comprises, in addition to the foregoing catalytic components, (3) at least one oxide selected from the group consisting of vanadium oxide, tungsten oxide and molybdenum oxide. The method makes it possible to prepare monoolefins, or a mixture of .alpha., .beta.-unsaturated nitriles and monoolefins in high yield and high selectivity from cheap starting materials, parafins.

Abstract: There is here disclosed a method for preparing an alkoxyphthalocyanine represented by the formula (1): ##STR1##

Abstract: In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from .alpha.-olefin of 3.about.20 carbon atoms, said ethylene copolymers having[A] a density of 0.85.about.0.92 g/cm.sup.3,[B] an intrinsic viscosity [.eta.] as measured in decalin at 135.degree. C. of 0.1.about.10 dl/g,[C] a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) as measured by GPC of 1.2.about.4, and[D] a ratio (MFR.sub.10 /MFR.sub.2) of MFR.sub.10 under a load of 10 kg to MFR.sub.2 under a load of 2.16 kg at 190.degree. C. of 8.about.50, and being narrow in molecular weight distribution and excellent in flowability.

Abstract: A sheet or a film composed of at least one cyclo-olefin polymer selected from the group consisting of ring-opened polymers derived from at least one cyclo-olefin of formula (I) ##STR1## wherein R.sup.1 to R.sup.12, independently from each other, represent a member selected from the class consisting of a hydrogen atom, halogen atoms and hydrocarbon groups; two of R.sup.9 to R.sup.12 may be linked to each other together with the carbon atoms to which they are bonded to form a monocyclic or polycyclic group which may contain a double bond; R.sup.9 and R.sup.10, or R.sup.11 and R.sup.12 may each form an alkylidene group together with the carbon atoms to which they are bonded; and n is 0 or a positive integer,ring-opened copolymers derived from the cyclo-olefins of formula (I), hydrogenation products of said polymer or copolymers and addition polymers of the cyclo-olefins of formula (I) with ethylene, said cyclo-olefin polymer having an intrinsic viscosity [.eta.], measured in decalin at 135.degree. C., of 0.

Abstract: Disclosed is a process for producing carbon materials which comprises the steps of preparing a raw material composition by mixing a methylene type linkage-containing condensation product of an aromatic sulfonic acid or a salt thereof with a solvent, the condensation product having been formed by means of a linkage of the formula--(CH.sub.2).sub.n --T.sub.x --(CHR).sub.m -- (1)where T is a benzene or naphthalene ring, R is a hydrogen atom, an alkyl group of 1 to 4 carbon atoms, or a benzene ring, and each of n, m and x is 0 or 1, but n and m should not be zero at the same time; spinning or molding the raw material composition; and carbonizing the spun fiber or molded article. Preferably, the aforesaid linkage is --CH.sub.2 --.

Abstract: A steam generator for a steam bath for generating steam from hot water supplied thereto. The steam generator for a steam bath has a closed main part equipped with a hot-water supply port, an air inlet, a discharge port and a steam outlet. Hot water received from the hot-water supply port is distributed in the main part so as to contact with air coming through the air inlet,and the thus generated steam is discharged through the steam outlet. Warm water formed as a result of steam generation is discharged from the discharge port.

Abstract: The present invention is directed to a method for recovering 2-chloropropionic acid so that this compound can be separated in a high-purity form. According to the method, crude 2-chloropropionic acid is heat-treated in the presence of a metal compound at a temperature in the range of 130.degree.-180.degree. C. where dichloro derivatives are contained as impurities or at a temperature not exceeding 160.degree. C. where no dichloro derivatives are contained. The metal compound is then removed at 160.degree. C. or lower. Final purification is thereafter conducted to obtain 2-chloropropionic acid as a high-purity product.

Abstract: A phenolic resin can be obtained by a condensation reaction between a specific trifunctional aromatic compound and a phenolic compound. This resin can be reacted with a curing agent such as a hexamine to give cured articles having excellent heat resistance, electrical properties, wear resistance and chemical resistance, and the phenolic resin is also much more excellent in curing reactivity as compared with conventional techniques.

Abstract: A synthetic resin emulsion whose polymer particles are solid core-shell particles in which form pores spontaneously upon drying is produced by the steps of preparing as core particles from 2 to 60 parts by weight of polymer (A) by emulsion polymerization of from 10 to 80 parts by weight of acrylate ester (a.sub.1) having an alkyl group of from 1 to 3 carbon atoms and from 90 to 20 parts by weight another of vinyl-type monomer (a.sub.2) copolymerizable therewith, forming a shell of a polymer (B) on the surface of the core particles of polymer (A) by emulsion polymerization in the presence thereof of from 98 to 40 parts by weight of vinyl-type monomer (b), different from polymer (a.sub.1) and successively hydrolyzing the core portion of the particles with an alkaline material. Organic pigments prepared from the synthetic resin emulsion can improve the hiding power, brightness, gloss and other properties of articles coated therewith.

Abstract: A pile driving and pile removing method comprises the step of causing a water-in-oil type water swellable polymer particle emulsion to be present on the pile surface or in the vicinity thereof during driving or extraction. The presence of the emulsion reduces the frictional resistance between the pile and the ground, enabling smooth and easy driving and removing of the pile.

Abstract: Angles of inclination of the two wavelength selection elements arranged on an optical path of a laser beam source are varied to make a laser output variable. Light transmitting ranges of the two wavelength selection elements are coincided with each other so as to adjust the light wavelength bands, thereby the laser beam is narrowed without increasing its fineness.

Abstract: Catechol derivatives which relate to the production of nerve growth factor in particular tissues of brain are disclosed.Methods for the synthesis, data on the physiological activity, and data on the toxicity of these derivatives as well as examples of preparation for their administration are also disclosed.The disclosed derivatives provide preventive and remedial effect for regressive disorders in the central nervous system including senile dementia of Alzheimer type.