Abstract: This invention relates to a novel polyimide or polyimide copolymer having excellent heat resistance and greatly improved processability, and has a novel aromatic diamino compound used for the polyimide, a preparation process thereof, a polyimide-based resin composition comprising the polyimide or polyimide copolymer and a fibrous reinforcement, a process for preparing the resin composition, an injection molded article of the resin composition.The polyimide comprise a requisite structural unit having one or more recurring structural units of the formula: ##STR1## wherein L is an oxygen atom, carbonyl, isopropylidene or hexafluoroisopropylidene, and X is ##STR2## and Ar is a tetravalent radical having 6 to 27 carbon atoms and being selected from the group consisting of a monoaromatic radical, condensed polyaromatic radical and noncondensed polyaromatic radical having aromatic radicals connected to each other with a direct bond or a bridge member.

Abstract: A process for continuously preparing rubber modified styrene resins from styrene monomers and acrylonitryle monomers in the presence of a rubbery polymer in accordance with a continuous mass and/or solution polymerization method by the use of serial polymerization device comprising two or more reactors; said process comprising(1) a first step of feeding a polymeric materials to the first reactor to carry out the polymerization of monomers in a condition where the rubbery polymer is not inverted to the dispersed phase, and a second step of adding a polymeric materials to second reactors to carry out the polymerization of the monomers and to thus invert the rubbery polymer to the dispersed phase,(2) a ratio of the added materials to the materials used in the first step being in the range of from 10 to 220% by weight,whereby impact resistance and surface gloss can be remarkably improved.

Abstract: In one aspect, the present invention relates to polyimides having excellent thermal resistance and process for preparing the same comprising carrying out condensation of 4,4'-bis(3-aminophenoxy)biphenyl with pyromellitic dianhydride in the presence of a different diamine compound and optionally with a different tetracarboxylic acid dianhydride.In a second aspect, the present invention relates to a heat resistant resin composition consisting essentially of an aromatic polyetherimide and a defined polyimide.In a third aspect, the present invention relates to a polyimide resin composition comprised on a defined polyimide and a separate high-temperature engineering polymer.In a fourth aspect, the present invention relates to a resin composition comprised of a defined polyimide and an aromatic polyamideimide.

Abstract: A fatigue-resistant polyimide resin composition comprising 100 parts by weight of polyimide having from 0.5 (exclusive) to 1.0 (inclusive) mole ratio of recurring structural units represented by the formula (1) and from 0 (inclusive) to 0.5 (exclusive) mole ratio of recurring structural units represented by the formula (2): ##STR1## wherein X is ##STR2## in the formulas (1) and (2), and having an inherent viscosity of 0.45 dl/g or more; and 5.about.65 parts by weight of a carbon fiber, glass fiber, aromatic polyamide fiber and/or potassium titanate fiber, and an injection molded article having a high fatigue resistance.

Abstract: The present invention discloses a parasiticide comprising, as the active ingredient, at least one natural or synthetic pyrethroid type compound.

Abstract: A process for preparing a metallic cadmium powder for use in a nickel-cadmium by heat melting metallic cadmium in an evaporator, introducing an inert gas into the evaporator to discharge cadmium vapor along with the inert gas into a cooler, and collecting the resulting metallic cadmium powder, wherein the process condition is regulated such that at least one of the following conditions (1) and (2) can be satisfied:(1) the amount of the inert gas flow introduced into the evaporator is at least 30 Nl/g of cadmium vapor while the direction of introducing the inert gas into the evaporator is set against the surface of the molten cadmium; and(2) the temperature of the molten cadmium in the evaporator and the amount of the inert gas flow introduced into the evaporator are set such that the following formulae can be satisfied:log y.gtoreq.8.8.times.10.sup.-3 x-5.3 (600.ltoreq.x.ltoreq.900), andlog y.gtoreq.1.8.times.10.sup.-3 x-0.96 (330.ltoreq.x.ltoreq.600),wherein x is the temperature (.degree.C.

Abstract: In accordance with the present invention, there are provided thermoplastic resin compositions comprising 80-40 parts by weight of specific aromatic polyamides (A) containing 30-100 mol % of terephthalic acid component units and 20-60 parts by weight of modified polyolefins (B) graft modified with .alpha.,.beta.-unsaturated carboxylic acid, anhydride or derivative thereof and having a crystallinity index of at least 35% or a glass transition temperature of at least 90.degree. C. and an intrinsic viscosity [.eta.] of 0.4-35 dl/g. With these compositions, there are prepared sliding parts such as gear and cam and electrical molding parts such as connector.

Abstract: A sample to be analyzed is taken from a flow line of a production process and transferred through a slender pipe to an analyzing device. The transfer is accomplished using a pressurized liquid with a segment gas being interposed between the sample and the pressurized liquid. The sample may be fed directly or after mixing with a diluting liquid in a mixing chamber. Samples may be taken at regular and constant time intervals and transferred to the analyzing device stably and over predetermined periods of time.

Abstract: The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 and R.sup.2 are each a hydrogen atom, a hydrocarbon group or the like; R.sup.3 is an alkyl group of 2 to 20 carbon atoms; R.sup.4 is an alkyl group of 2 to 20 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like.The transition metal compound is useful for an olefin polymerization catalyst with which a propylene (co)polymer having specific structure is prepared.

Abstract: Disclosed is a resin laminate comprising: an outer layer formed from a linear polyethylene having a specific density; an inner layer formed from a linear polyethylene having a specific density; and an intermediate layer(s) provided between the outer layer and the inner layer, wherein at least one intermediate layer comprises a linear polyethylene having a specific density different from those of the linear polyethylenes for forming the outer layer and the inner layer; and at least one layer of the outer, inner and intermediate layers is formed from a linear polyethylene composition containing a high-density polyethylene having a specific density. Also disclosed in a container formed from the resin laminate. The resin laminate is excellent in hygienic qualities, transparency, flexibility and heat resistance. The container is hardly distorted even when subjected to a sterilization process under severe conditions, and is excellent in heat resistance, sealing strength, drop strength, transparency and flexibility.

Abstract: A fluororesin powder liquid dispersion comprising heat-flowable fluororesin powder, liquid dispersion medium having a surface tension of not more than 45 dyne/cm, and organic liquid with a boiling point of 150.degree.-340.degree. C. provides thick film fluororesin treatment by a single application.

Abstract: A resin composition for an electrophotographic toner is here disclosed which comprises an ethylene series high polymer (Y) and an ethylene series polymer (X) prepared from 100 parts of a bifunctional ethylene series unsaturated monomer and 0.01-10 parts by weight of a substance having three or more peroxide groups in the molecule and/or a substance having one or more unsaturated functional groups and one or more peroxide groups in the molecule, Mw/Mb (Mw is weight-average molecular weight, and Mb is weight-average molecular weight between crosslinking points) of said polymer (X) being from 2 to 99, Mw of said polymer (X) being 50,000 or less. This resin composition is excellent in the balance of various physical properties required for the toner, and particularly, it is excellent in offset resistance and toner strength.

Abstract: A fibrous electrically-conductive filler herein provided comprises fibrous aluminum borate as a core material provided thereon with, in order, an optional titanium oxide intermediate layer and an antimony-free tin oxide layer. The fibrous electrically-conductive filler can be prepared by a method which comprises the steps of optionally forming an intermediate layer of titanium oxide by depositing titanium oxide hydrate on the surface of the core material and then calcining the titanium oxide hydrate layer; then forming a coating layer of tin oxide hydrate on the surface of the titanium oxide-coated fibrous aluminum borate or the fibrous aluminum borate as a core material and then calcining the coating layer at a temperature ranging from 150.degree. to 600.degree. C. in an inert gas atmosphere or a reducing atmosphere to form an antimony-free tin oxide layer.

Abstract: High-sensitivity transmission can be performed in a wide temperature range, and spread spectrum communication free from jitters and bit errors in high-speed digital signal transmission can be performed. There is provided a spread spectrum communication transmitter for performing FSK modulation for switching the frequency in correspondence with the level of each bit of the serial digital data, performing spread spectrum modulation of a resultant FSK-modulated signal, and transmitting the data, wherein an FSK modulation unit (1) for performing the FSK modulation has a direct digital synthesizer and a synchronization circuit (19) is arranged to synchronize an FSK signal having a frequency corresponding to at least one level of the each bit with a PN code for the spread spectrum modulation.

Abstract: A multi-shell emulsion particle of dry state structure having one or more of penetrating pore(s) connecting the surface layer of the particle with the interior of the particle and having a particle diameter of from 0.1 to 5.0.mu. preferably from 0.1 to 1.2.mu..

Abstract: A piezoelectric ceramic is provided which comprises a perovskite-based solid solution represented by the formula:Pb.sub.1-a M.sub.a {(Ni.sub.1-b Zn.sub.b).sub.1/3 Nb.sub.2/3 }.sub.x Ti.sub.y Zr.sub.z O.sub.3wherein M represents Ba or Sr and x+y+z=1,the perovskite-based solid solution having, added thereto, La.sub.2 O.sub.3 or Nd.sub.2 O.sub.3, as a metallic oxide of Group A and NiO, Fe.sub.2 O.sub.3, SnO.sub.2 or Ta.sub.2 O.sub.5 as a metallic oxide of Group B. The piezoelectric ceramic of the present invention exhibits large value of piezoelectric constant d and high Curie point, so that it is useful as a material of a piezoelectric actuator.

Abstract: Described are Drechslera monoceras var. microsporus strains, that is, new microorganism strains which show herbicidal effects against all varieties of barnyard grass, i.e., Echinochloa spp. as weed even at temperatures as low as 15.degree. C. but does not give any influence to cultivation crops such as rice; weed control compositions against barnyard grass, said compositions each containing one of the microorganism strains as an effective ingredient and having high safety and selectivity; and a barnyard grass control method employing at least one of the microorganism strains. Combined use of at least one of the microorganism strains with a chemical herbicide makes it possible to substantially reduce their dosages compared with those required when they are singly applied.

Abstract: Aminoketone derivative compounds containing a heterocyclic ring bonded to an aminoketone moiety and useful as effective ingredients of centrally acting muscle relaxants and pollakiurea curing agents.(+)3-phenyl-5-[2-(1-pyrrolidinylmethyl)butyryl]isoxazole, which has a more remarkable central muscle relaxant action as compared with its racemic modification, can be effectively separated from the racemic modification using optically active 10-camphorsulfonic acid as the agent for the optical resolution.

Abstract: Described are Drechslera monoceras var. microsporus strains, that is, new microorganism strains which show herbicidal effects against all varieties of barnyard grass, i.e., Echinochloa spp. as weed even at temperatures as low as 15.degree. C. but does not give any influence to cultivation crops such as rice; weed control compositions against barnyard grass, said compositions each containing one of the microorganism strains as an effective ingredient and having high safety and selectivity; and a barnyard grass control method employing at least one of the microorganism strains. Combined use of at least one of the microorganism strains with a chemical herbicide makes it possible to substantially reduce their dosages compared with those required when they are singly applied.

Abstract: A human growth hormone having a molecular weight of 20,000 daltons can be effectively secreted and produced in the periplasm of Escherichia coli by constructing a human growth hormone secretion plasmid comprising a vector DNA replicable in E. coli and a DNA fragment including a promoter, a ribosome binding site, a secretion signal coding region, which are all those of the neutral protease gene of B. amyloliquefaciens and a gene encoding 20 kD hGH placed just downstream from the secretion signal coding region; introducing the said plasmid into E. coli; and culturing the resultant transformed cells.