Abstract: According to the present invention, molded articles can be provided in which a melting point attributed to a syndiotactic polypropylene and measured at a temperature rise rate of 10.degree. C./minute by differential scanning thermal analysis is indicated by a substantially single peak, the aforesaid molded articles being obtained by heating, melting and molding a substantially syndiotactic homopolymer of propylene, a substantially syndiotactic copolymer of propylene and a small amount of another olefin, or a mixture of these polymers and a small amount of a substantially isotactic polypropylene, and then subjecting the molded products to a heat treatment. Furthermore, a method for preparing the above-mentioned molded articles is also provided. The molded articles have high stiffness and impact resistance.

Abstract: Catechol derivatives which produce nerve growth factor in particular tissues of the brain are disclosed. These derivatives provide preventive and therapeutic effects for regressive disorders of the central nervous system including senile dementia of the Alzheimer type.

Abstract: Disclosed herein is an electrophotographic toner composition produced by using a low-melt-viscosity and high-strength resin. The present invention provides a toner which fixes at low heat and has high strength and therefore, is suitable for high-speed copying machines and lower-heat copying machines. The resultant benefits of the present invention are that the lowest limit of the fixing temperature is low, non-offset range is wide and picture properties are good. The electrophotographic toner composition can, therefore, provide stable pictures even when fixed at low heat.

Abstract: A thermoplastic polymer which is the reaction product of(A) at least one copolymer selected from the group consisting of ethylene/unsaturated carboxylic acid copolymers and ionically crosslinked products thereof wherein the ion is a zinc, cobalt, nickel, copper, lead or magnesium ion,(B) a polyamine compound having at least two primary and/or secondary amino groups, and(C) a polyepoxy resin in a proportion corresponding to not more than one epoxy group for one amino group of the polyamine compound; and a process for its production.

Abstract: Heat-sensitive recording paper which employs as a chromogenic compound a novel fluoran compound represented by the formula: ##STR1## and prepared reacting a benzoic acid derivative of the formula: ##STR2## with a diphenylamine derivative of the formula: ##STR3## wherein R is a lower alkyl group have excellent stability.

Abstract: A novel aromatic diamine; a polyimide comprising 1,3-bis(3-aminobenzoyl)benzene or 4,4'-bis(3-aminobenzoyl)biphenyl as a diamine component and having recurring structural units represented by the formula (III): ##STR1## wherein R is a tetravalent radical selected from the group consisting of an aliphatic radical having from 2 to 27 carbon atoms, alicyclic radical, monoaromatic radical, condensed polyaromatic radical, and noncondensed aromatic radical connected each other with a direct bond or a bridge member, and X is a divalent radical of ##STR2## and a polyimide having a terminal aromatic group which is essentially unsubstituted or substituted with a radical having no reactivity with amines or dicarboxylic acid anhydrides or a composition comprising said polyimide.

Abstract: A two-component, or two-part epoxy resin composition which adheres well to wet mortar and concrete is provided. One part comprising a non-cycloaliphatic epoxy resin, a reactive diluent in the form of an epoxy compound, a modifying resin selected from the group consisting of a coumarone-indene polymer resin, a dicyclopentadiene polymer resin, an acrylonitrile modified polyvinyl chloride resin, an amino terminated acrylonitrile-butadiene copolymer resin, and an epoxy terminated polybutadiene resin, a silane coupling agent having an epoxy or amino group, and a synthetic zeolite is combined, on use, with the other part comprising an amine curing agent selected from the group consisting of a cycloaliphatic polyamine, an aliphatic/aromatic polyamide, and an amine adduct.

Abstract: The present invention relates to a process for preparing trehalulose and isomaltulose wherein at least the trehalulose-forming enzyme system of a trehalulose-forming microorganism is contacted with a sucrose solution to convert it into trehalulose and isomaltulose in the weight ratio of at least 4:1.

Abstract: A thermal adhesive vibration damping sheet comprising a sheet substrate having crystalline polyolefin particles attached to a surface thereof, said polyolefin particles having a mean particle size of 1 to 20 .mu.m and exhibiting an endothermic curve having a high temperature side endothermic peak in the range of from 50.degree. to 230.degree. C. as measured by a differential scanning calorimeter. The sheet has improved blocking resistance, adhesion to sheet steel through heat fusion, and impact resistance at low temperatures.

Abstract: Propylene can be prepared in high yield and selectivity by dehydrating isopropanol in the presence of a .gamma.-alumina catalyst having a mean pore diameter of from 30 to 150 .ANG. with a standard deviation (.sigma..sub.n) of from 10 to 40 .ANG. based on statistic calculation from pore diameter and pore volume.

Abstract: A road void search radar system includes a rotary encoder, a radar controller, an analyzer, and a recording unit. The rotary encoder generates a pulse signal having a period corresponding to a predetermined distance interval traveled by a vehicle. The radar controller outputs a wave every time the pulse signal is supplied from the rotary encoder. The analyzer analyzes an underground state by processing the output signal received from the radar controller. The recording unit records digital data signals and analyzes results.

Abstract: There is disclosed a homoplymer of an alkenylsilane having a syndiotactic structure and a copolymer of the alkenylsilane and an .alpha.-olefin. The polymer and the copolymer can be prepared by subjecting the alkenylsilane or the alkenylsilane and the .alpha.-olefin to addition polymerization in the presence of a transition metal compound having asymmetirically interconnected ligands or preferably in the presence of the transition metal compound and aluminoxane. The polymer and the copolymer can be used as a nucleating agent for a crystalline polypropylene.

Abstract: An adhesive resin composition comprising an ethylene/vinyl acetate copolymer, a styrene polymer resin, graft-modified polyethylene, a polystyrene elastomer and an ethylene/.alpha.-olefin copolymer in combination is disclosed. This adhesive resin composition shows an excellent adhesiveness between a metal and a thermoplastic resin. When this adhesive resin composition is used for bonding a polyester resin and a gas-barrier resin, a good bonding which is not degraded even by high-temperature heating can be attained.

Abstract: The present invention is intended for the preparation of a cycloolefin random copolymer, which is a copolymer of ethylene, cycloolefin and if necessary .alpha.-olefin, in a high yield. The process for preparing a cycloolefin random copolymer according to the invention is a process for preparing a cycloolefin random copolymer comprising repeating units derived from (i) ethylene in an amount of 40 to 97% by mol, repeating units derived from (ii) cycloolefin in an amount of 3 to 60% by mol and repeating units derived from (iii) .alpha.-olefin of 3-20 carbon atoms in an amount of 0 to 20% by mol, wherein (i) ethylene, (ii) cycloolefin and if necessary (iii) .alpha.-olefin of 3-20 carbon atoms are copolymerized in a liquid phase in the presence of a catalyst formed from (A) a soluble vanadium compound having a tertiary alkoxy group or .beta.-diketone as a ligand and (B) an organoaluminum compound represented by the formula (i-Bu) .sub.n AlCl.sub.3-n wherein n is 1.0 to 2.5.

Abstract: Combinations of (A) N,N-di-substituted urea of formula (I) and a compound selected from (B) 3,6-dichloro-2-methoxybenzoic acid, [(3,5,6-trichloro-2-pyridyl)-oxy]acetic acid triethylamine salt, 2-(4-chloro-2-methylphenoxy)propionic acid, 4-amino-3,5-dichloro-6-fluoro-2-pyridineoxy acetic acid, 3-isopropyl-1H-2,1,3-benzothiazin-4(3H)-one-2,2-dioxide and 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)1,2,4-triazin-5(4H)-one. These combinations exhibit herbicidal activity against a wide range of weeds even in a comparatively small dosage, and are safe and show no phytotoxicity to useful crops.

Abstract: Resin compositions having excellent mechanical strength, especially at high temperatures are disclosed. The resin compositions comprise 95-60 wt. % of an aromatic polyetherketone having recurring units represented by the following formula: ##STR1## 5-40 wt. % of a polyetherimide having recurring units represented by the following formula: ##STR2## Also disclosed are fiber-reinforced resins, which comprise 75-55 wt. % of one of the above compositions and 25-45 wt. % of carbon fibers obtained by coating starting carbon fibers with an aromatic polysulfone resin and then heating the thus-coated carbon fibers at 300.degree.-400.degree. C., and mechanical components made of desired one of the fiber-reinforced resins which are suitable for use in internal combustion engines or auxiliary equipment.

Abstract: An improved method for underwater reclamation is disclosed. Dredged mud sent under pressure by an earth and sand conveying device is treated with solidifying material, and before it is solidified, it is directly fed to an underwater reclaiming apparatus. The treated mud is fed through a discharge port of the underwater reclaiming apparatus, while the discharge port is always maintained embedded at a constant depth in a previously deposited underwater reclamation mud layer at the bottom of the water. An apparatus for underwater reclamation that is suitable for practicing the improved method is also disclosed.

Abstract: A degradable polymer network obtained by adding from 0.2 to 10 parts by weight of a foaming agent to 100 parts by weight of a polylactic acid-base resin composition comprising from 80 to 100% by weight of polylactic acid or a lactic acid-hydroxycarboxylic acid copolymer and from 0 to 20% by weight of a plasticizer, conducting melt-foaming extrusion of resulting mixture, and opening the foam cells in the extrudate. The high polymer network is characterized in suitable flexibility and hydrolyzability and thus useful as a material for absorbing oils and body fluids, screens for sunlight, heat-insulating materials, filter media and packaging materials; and does not accumulate as industrial wastes because of hydrolyzability in the natural environment, even though abandoned after use.

Abstract: p-Aminophenyl acetate is isomerized to p-acetylaminophenol in the presence of an acid such as acetic acid or phosphoric acid.

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.