Abstract: A method for producing an aromatic polycarbonate which comprises subjecting to a transesterification polymerization reaction at least one polymerizable material for an aromatic polycarbonate, the transesterification reaction being performed in one or more polymerizers which is or are connected through a pipeline system toward an outlet for a final aromatic polycarbonate product, wherein the pipeline system comprises one or more pipes, through which a molten aromatic polycarbonate having a number average molecular weight increased by the transesterification polymerization reaction is passed while contacting an inner wall of the pipe or pipes, the pipeline system having at least one viscous polycarbonate passage region in which a molten aromatic polycarbonate having a number average molecular weight of 6,000 or more is passed through the pipe, wherein the pipe in the at least one viscous polycarbonate passage region is heated to provide a temperature difference in the range of from -3.degree. C. to 50.degree.

Abstract: Disclosed is a thermally stable aromatic polycarbonate composition comprising an aromatic polycarbonate, which is substantially free of a chlorine-containing compound, and a thermal stabilizer, the aromatic polycarbonate comprising a plurality of aromatic polycarbonate chains, each comprising recurring aromatic carbonate units and having a terminal aryl carbonate group and a terminal hydroxyl group, wherein each recurring unit has a divalent aromatic or pyridylene group comprising one or more divalent constituent aromatic or pyridylene groups, and wherein the plurality of aromatic polycarbonate chains collectively contain at least one constituent aromatic or pyridylene group substituted with at least one methyl group in an amount of 0.0001 or less in terms of the molar ratio of the methyl group substituted constituent group or groups relative to all constituent groups in the aromatic polycarbonate chains.

Abstract: A process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation, which comprises reacting propane or isobutane with ammonia and molecular oxygen in the gaseous phase in a fluidized-bed reactor containing a catalyst comprising a compound oxide and a silica carrier having supported thereon the compound oxide, wherein the compound oxide contains molybdenum (Mo), tellurium (Te), vanadium (V) and niobium (Nb), and wherein the reaction is performed with an addition of a catalyst activator comprising at least one tellurium compound and optionally at least one molybdenum compound into the reactor.

Abstract: The present invention relates to Mucoriopsis ellipsoidus fungus. The invention also provides methods of extracting chitin from Mucoriopsis ellipsoidus and the chitin produced by this process.

Abstract: Disclosed is an injection molding method for producing a shaped, hollow resin article by introducing a pressurized fluid into a molten resin mass injected into a mold cavity, wherein, during the introduction of the pressurized fluid, the temperature of at least one preselected portion of a back surface of the molten resin mass is maintained at a level which is at least 5.degree. C. higher than the temperature of a front surface of the molten resin mass, causing the fluid to flow into the molten resin mass along a line substantially corresponding to a line along which the preselected portion of the back surface extends, so that a shaped, hollow resin article produced has a hollow in a position corresponding to the preselected portion of the back surface. By the method of the present invention, the flow of the pressurized fluid introduced can be surely led to an intended portion in the molten resin mass, so that the location of a hollow in the molten resin mass can be surely controlled.

Abstract: The present invention provide a method for producing 2-cyclohexene-1-ol which comprises using a catalyst containing an inetermetallic compound of palladium and lead and/or bismuth when cyclohexenyl hydroperoxide is subjected to hydrogenolysis to produce 2-cyclohexene-1-ol.If the catalyst of the present invention is employed, it is possible to obtain the desired 2-cyclohexene-1-ol at a high selectivity with a much simpler reaction system than the prior art and, in addition, to inhibit the hydrogenation of coexisting cyclohexene sufficiently.

Abstract: Disclosed is an aromatic polycarbonate-styrene polymer resin composition comprising (A) an aromatic polycarbonate, (B) a specific rubber-modified styrene polymer and (C) a compatibility agent which is a copolymer containing an aromatic vinyl monomer and which has a non-uniform distribution with respect to the proportions of component monomers constituting the copolymer, so that the copolymer comprises copolymer molecules having different solubility parameter (SP) values, wherein the difference in SP value between the copolymer molecule having a maximum SP value and the copolymer molecule having a minimum SP value is from 0.3 to 1.0 ?(cal/cm.sup.3).sup.1/2 !, and wherein the copolymer has an average SP value of from 10.6 to 11.0 ?(cal/cm.sup.3 ).sup.1/2 !.

Abstract: A homogeneous electrorheological fluid is disclosed, which mainly comprises a liquid crystal compound in which a plurality of liquid crystal groups are bonded to a molecular chain either directly or via a spacer, or comprises a lyotropic liquid crystal comprising a solute and a solvent. The electrorheological fluid exhibits higher electrorheological effects as well as high response rate and low power driving properties while being free from sedimentation or flocculation.

Abstract: An improved wet-laid nonwoven fabric for a battery separator wherein 20 to 95% by weight of thermoplastic staple fibers having a single fiber diameter of 20 .mu.rm, or less are three-dimensionally entangled with hot-melt fibers having a melting point lower by 20.degree. C. than that of the thermoplastic staple fibers so that a mean fiber entangling point interval is 300 .mu.m or less, wherein at least part of the hot-melt fibers are fused to bond the fibers with each other to fix the nonwoven structure. The nonwoven fabric has a basis weight in a range from 10 to 350 g/m.sup.2, a thickness in a range from 30 to 1000 .mu.m and an apparent density in a range from 0.26 to 0.7 g/cm.sup.3, and is excellent in uniformity and mechanical strength. The wet-laid nonwoven fabric is particularly excellent in air permeability, liquid holding capability, liquid retention capability and liquid absorption rate and satisfies the requirement for a battery separator.

Abstract: A process for hydrogenating a conjugated diene polymer, which process comprises the steps of: deactivating a conjugated diene polymer which is prepared by using an organic alkali metal compound as a polymerization initiator by adding a deactivator; and contacting the deactivated diene polymer with hydrogen in an inert hydrocarbon solvent to hydrogenate the double bond of the deactivated diene polymer, wherein the hydrogenation is carried out (i) in the presence of a catalyst selected from organometallic compounds represented by the following formula: ##STR1## wherein the symbols are defined in the specification and (ii) under a condition satisfying the following relationship:-6<(M-Z+Al-Ti)/Ti<2wherein M represents the molar amount of the organic alkali metal compound; Z represents the molar amount of the deactivator; Al represents the molar amount of an organoaluminum compound; and Ti represents the molar amount of an organotitanium compound.

Abstract: An improved joining structure for a waterproof fabric composed of a base fabric with a soft (elastomeric) resin film adhered thereon is provided. The joining structure is formed in a welt seam in which a hot-melt resin adhesive layer is interposed as a part of intermediate layers of the structure. The joining structure has properties of (1) bond strength .gtoreq.25 kg/25 cm width, (2) bending stiffness .ltoreq.20 gf.multidot.cm.sup.2 /cm and (3) water resistance after rubbing 1,000 times according to Scott shape method .gtoreq.800 mm H.sub.2 O.The joining structure can be formed by a method including joining the waterproof fabrics to form a welt seam with a hot melt resin layer put between and following that applying a high-frequency welding to the welt seam portion at a condition with an insulating elastic sheet interposed between the welt seam portion and electrode means to cause the hot-melt resin to be melted.

Abstract: Disclosed is a resin composition comprising (.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer having a number average molecular weight of from 10,000 to 5,000,000, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, and (.beta.) at least one polymer other than the polymer (.alpha.), and wherein the polymer (.alpha.) is present in an amount of at least 1% by weight, based on the total weight of the polymers (.alpha.) and (.beta.). The molecular structure of the polymer (.alpha.) which is contained in the novel resin composition of the present invention and which is selected from a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, can be controlled with large freedom. Therefore by combining the polymer (.alpha.) with a polymer (.beta.

Abstract: The present invention offers a method for recovering the paints suitable to an object that, in a booth for a spray coating used for coating a material, the oversprayed paints can be easily recovered and recycled as they are or after a simple adjustment as reusable paints and it also offers a receiver used for said recovery. A method for recovering paints, characterized in that, a receiver using an ultrafiltration membrane or a microfiltration membrane is placed in a spray coating booth and water or organic solvent is contacted the one side of said membrane so that the oversprayed paint are received on the other side of said membrane and recovered therefrom; and a receiver for recovering paints, characterized in that, said receiver has two or more hollow fiber membranes arranged on a plate where at least one end of the membranes is open, with a fixing material which fixes and holds the hollow fiber membranes on the plate and distributing pipes connecting to the open end of each of the hollow fiber membrane.

Abstract: A light conducting plate for back lighting which comprises a methacrylic copolymer resin comprising 90 to 99.5% by weight of a methyl methacrylate unit and 0.5 to 10% by weight of an alkyl acrylate unit containing 1 to 8 carbon atoms in the alkyl moiety thereof and having a reduced viscosity of 35 to 60 ml/g in chloroform, the chromaticity of said light conducting plate having x and y color coordinates both ranging from 0.01 to 0.001 as obtained according to JIS-Z-8701.

Abstract: A polyurethane elastic fiber made from a polyurethane obtained from a copolymerized polyalkyleneether diol composed of different alkyleneethers containing 2-10 carbon atoms; the polyurethane comprises a urethane portion having a number average molecular weight of 6000-9500 and a urea portion having a number average molecular weight of 650-950. The polyurethane elastic fiber has improved elastic functions such as high elongation at break (elongation at break is 500%, or more), low modulus (300% modulus is 0.20 g/d, or less), excellent low temperature characteristics, and heat resistance; and, therefore, creation of highly excellent converted goods is made possible.

Abstract: Disclosed is a semicarbazide derivative represented by formula (1) or a terminal-blocked form thereof: ##STR1## wherein R.sup.1 represents a terminal isocyanate group-free polyisocyanate residue or a terminal isocyanate group-free triisocyanate residue; R.sup.2 represents an alkylene group, a cycloalkylene group, or an arylene group; each R.sup.3 independently represents a hydrogen atom or an alkyl group; n is zero or 1; and each of l and m is independently zero or a positive integer, provided that l and m satisfy the relationship 3.ltoreq.(l+m).ltoreq.20. Also disclosed is (.delta.) a composition comprising (.alpha.) at least one member selected from the group consisting of the semicarbazide derivative and a terminal-blocked form thereof and (.beta.) at least one member selected from the group consisting of a hydrophilic group-containing compound and a terminal-blocked form thereof. Also disclosed is a coating composition comprising (.gamma.) a polycarbonyl compound, and component (.alpha.) or composition (.

Abstract: There are disclosed a para-aramid shaped article having a density of 1.390-1.470/cm.sup.3. The para-aramid has an inherent viscosity .eta.inh of at least 3.5 and contains metal ions of 500 ppm or less, the metal ions being combined with acid end groups linked with the para-aramid molecules. The invention also relates to a process for preparing the same. Due to a reduced rate of moisture sorption, a reduced hygroscopic expansion coefficient and excellent mechanical properties, the para-aramid of the present shaped article is suitable for use for reinforcing fiber materials for a composite material and for a magnetic recording medium.

Abstract: Disclosed is a process for producing an aromatic carbonate which comprises transesterifying, in the presence of a metal-containing catalyst, a starting material selected from the group consisting of a dialkyl carbonate, an alkyl aryl carbonate and a mixture thereof with a reactant selected from the group consisting of an aromatic monohydroxy compound, an alkyl aryl carbonate and a mixture thereof, wherein the transesterification is conducted while maintaining a weight ratio (WR) of at least one aromatic group-containing substance selected from the group consisting of a specific aromatic polyhydroxy compound and a residue thereof to the metal of the metal-containing catalyst at 2.0 or less, wherein the weight ratio (WR) is measured with respect to a catalyst-containing liquid-phase mixture in a system for the transesterification, and wherein the aromatic group-containing substance originates from the starting material, the reactant and/or a by-product of the transesterification.

Abstract: An uncoated hollow weave air bag composed of a hollow weave fabric in which the circumferential periphery of the hollow part shaping the bag body is joined by a band of one layer bind weave, the hollow weave air bag satisfying the condition ?1! -?3! below: ?1! the weave constituting cloth A forming the hollow part of the bag body is a plain weave and the cover factor of cloth A being 2000.ltoreq.K.ltoreq.2300, ?2! the weave constituting cloth B which is the other cloth forming said hollow part, and the ratio of gas permeability at a pressure of 19.6 kpa for cloth B (qB) to that of cloth A (qA), qB/qA satisfies a relation 1.ltoreq.qB/qA.ltoreq.2.2, ?5! an opening (6) for attachment of the gas generator is provided in part of cloth B. The air bag of the present invention can be produced in a simplified manufacturing process and is light weight, less bulky and excellent in its safe inflation characteristics.

Abstract: A process for producing an .alpha.,.beta.-unsaturated nitrile, the process comprising the step of: reacting (1) a hydrocarbon selected from an olefin selected from propylene and isobutylene, a paraffin selected from propane and butane, and tertiary butyl alcohol, (2) ammonia, and (3) an oxygen-containing gas, in a reactor at a high temperature in a gas phase over a fluidized bed, so as to prepare an .alpha.,.beta.-unsaturated nitrile having the same number of carbon atoms as the hydrocarbon as a starting material, the reactor comprising a reactor vessel having therein, from a bottom of the reactor vessel, an oxygen-containing gas dispersing plate or pipe and a mixed gas dispersing pipe for dispersing a mixed gas of the hydrocarbon and the ammonia, a pressure loss in the oxygen-containing gas dispersing plate or pipe is controlled to the range of from 0.6 to 3.0 times a pressure loss in the fluidized bed.