Abstract: A method of making a steering hand wheel insert including the steps of: (a) in a gas assisted injection molding apparatus, forming a mold cavity having a ring-shaped outer channel, an inner channel, and a plurality of spoke channels; (b) forming a stationary mold insert in the outer channel dividing the latter into a pair of symmetric outer channel segments having downstream ends connected by a plurality of choke passages around the stationary mold insert; (c) injecting a short shot of a flowable plastic melt into each of the outer channel segments through a gate diametrically opposite the stationary insert and into the inner channel through a second gate; (d) injecting inert gas under pressure into the flowable plastic melt diametrically opposite the stationary insert; (e) maintaining the gas pressure until all of the flowable plastic melt cures in the mold cavity, (f) relieving the pressure of the inert gas, and (g) opening the mold cavity and removing the molded plastic steering hand wheel insert having a

Abstract: An insufflator for inflating body cavities, comprising a body to which a cannula and a needle are mounted, said needle being disposed in the cannula. The needle discharges gas from a regulator into the cavity gas from its distal end. A flow channel between the needle and cannula leads from the distal end of the cannula to the regulator. The regulator governs both the supply of gas to the cavity and the relief of excess pressure from the cavity.

Abstract: Beta carbolines are naturally occurring fluorescent analogues of several classes of neurotransmitters, namely indoles, indoleamines and catecholamines. The fluorescent properties of the beta carboline, harmaline, has been used to assess serotonin uptake systems by direct visualization. This method may provide a tool to examine the mode of action of new or existing serotonergic active compounds or the efficacy of a serotonergic active compound for individual patients in need thereof.

Abstract: Hydrogen Sulphide is a toxic gas present in many environments. It is necessary for a detector to be highly sensitive and not to respond to other common gases. The sensor is made up of electrodes (5) coated with a thin layer (6) of material comprising the oxides of molybdenum and tungsten and in the presence of hydrogen sulphide gas, changes its resistance. The layer is formed in such a way that a bronze-like ordered lattice is formed, containing molybdenum, tungsten and oxygen ions.

Abstract: A transition metal composition has the composition M.sub.m,X.sub.p,TYn'Z where M is a metal of Groups Ib, IIa, IIIb, VIIa or VIII of the Periodic Table, X is an anion, T is a transition metal of Groups IVA--VIA of the Periodic Table, Y is an anion, Z is a melt-producing compound, m' is greater than zero and less than 100, n' is greater than zero and less than 8 (m'+1), and p' is m' x(valency of M)/(valency of X). The compositions of this type may be transformed into a liquid by heating and the hot liquid sprayed and the spray cooled. The sprayed material has a useful particle form and may be used as a component of a polymerization catalyst to polymerize an unsaturated monomer such as ethylene.

Abstract: A transition metal composition is obtained by treating at least one particulate support material with at least one organomagnesium compound, at least one cleavage agent and at least one transition metal compound of Groups IVA, VA or VIA of the Periodic Table. The support material is typically a metal oxide, such as alumina or silica. The orgaomagnesium compound is typically a dialkyl magnesium compound such as dibutyl magnesium. The cleavage agent may be an amine, a thioalcohol, an ester, a carboxylic acid or particularly an alcohol such as n-butanol. The transition metal compound is added after the organomagnesium compound and the cleavage agent and is typically titanium tetrachloride. The product may be used as a catalyst component to polymerise an olefine monomer such as ethylene.

Abstract: A component for an olefin polymerization catalyst which is the product of treating a particulate support material with (a) an organo-magnesium compound, (b) an aluminium compound e.g. ethyl aluminium dichloride, (c) an organometallic compound of general formula R.sub.m MX.sub.p wherein M is a metal of Groups IA, IIA, IIB, IIIB, VA or VIA of the Periodic Table, R is a hydrocarbyl or substituted hydrocarbyl group, X is a singly charged anionic ligand or a monodentate neutral ligand, m is an integer up to the highest valency of the metal M and p is 0 or an integer up to 2 less than the valency of the metal M, e.g. zirconium tetrabenzyl, and (d) at least one transition metal compound of Groups IVA, VA or VIA, e.g. titanium tetrachloride. The catalyst component can be used to effect copolymerization of ethylene with an alpha-olefin monomer such as butene-1 in a fluidized bed reactor.

Abstract: A component for an olefin polymerisation catalyst which component is the product of treating a particulate support material with (a) an organomagnesium compound, (b) a transition metal compound of Groups IVA, VA or VIA, e.g. bis-butoxy titanium dichloride, (c) a pacifying agent, e.g. HCl and (d) optionally an aluminium compound, e.g. ethyl aluminium dichloride, an organometallic compound, e.g. zirconium tetrabenzyl, a halogenating agent e.g. silicon tetrachloride, or a Lewis Base compound, e.g. ethyl benzoate.

Abstract: The invention relates to combustible gas detectors of the kink in which a heatable wire filament exhibits a change in resistance due to a change in its temperature caused by the oxidation of a combustible gas passing over it. In order to avoid poisoning the heatable wire filament is embedded in a pellet consisting of a homogeneous mixture of an oxidation catalyst material and zeolite material the latter preferbly of type X, Y, L or mordenite of large pore size. Additionally layers of catalytically active material and/or inactive non-catalytic porous material may be provided around the outside of the pellet.

Abstract: The invention provides a combustible gas detector in which a heatable wire filament embedded in a pellet comprising oxidation catalyst material exhibits a change in resistance occasioned by the change in its temperature which occurs due to the oxidation of a combustible gas passing over it.The pellet is provided with an outer layer of inert non-catalytic material which tends to prevent non-volatile residues from reaching catalytically active regions of the detector.

Abstract: Tetraalkyltin compounds substantially free from tin, tin alkyl and di alkyl contaminants are prepared by reacting an alkyl halide of 1 - 4 carbon atoms with tin in the presence of an 'onium salt e.g. a quaternary ammonium halide and at least 0.5 g atom of zinc per g atom of tin, and collecting a vapor phase effluent comprising the tetraalkyltin. The tetraalkyltin can be disproportionated with stannic chloride to give alkyltin chlorides, intermediates for making stabilizers for polymers and biocides.

Abstract: A gas detector consists of a heatable wire filament which exhibits a change in resistance when its temperature rises due to the oxidization of a combustible gas pouring over it. The filament is embedded in a pellet consisting of a homogeneous mixture of an oxidization catalyst material and a substantially non-catalytic carrier material. A layer of the oxidization catalyst material is produced on the outside of the pellet.

Abstract: Polymerization of ethylene using a transition metal hydrocarbyl complex, especially zirconium tetrabenzyl, supported on alumina consisting of substantially spherical particles having diameters in the range 20-150 .mu.m. The particulate polymer produced by the process contains substantially no "fines" (i.e. particles <100 .mu.m diameter) and has improved pourability.

Abstract: Process for the dispersion polymerization or copolymerization of olefins, especially ethylene alone or with an .alpha.-olefin, which is conducted in the presence of a surface-active compound containing one or more perfluorocarbon groups and, optionally, one or more hydrophilic groups, to reduce fouling of the reactor with adherent polymer particles. Particularly effective when olefins are polymerized with supported transition metal hydrocarbyl catalysts in non-polar hydrocarbon diluents.

Abstract: Ethylene is copolymerized with one or more mono .alpha.-olefins, especially butene and/or hexene, using as catayst a Group IVA metal hydrocarbyl compound supported on particulate alumina, the purity ratio (i.e. the molar ratio of Group IVA metal to Group I to III metal) of the said compound being at least 100/1 and, preferably, 500/1. By using these very pure compounds, especially in the case of zirconium tetrabenzyl, the incorporation of co-monomer in the copolymer product may be enhanced.

Abstract: a copolymer of ethylene with at least one other mono-.alpha.-olefine is prepared and is characterized as having a density in the range 918 to 940 Kg/m.sup.3, an apparent viscosity (A) at 200.degree. C and a shear rate of 100 sec.sup.1 of 0.5 .times. 10.sup.3 to 3.0 .times. 10.sup.3 Nsm.sup.2 and a viscosity at 200.degree. C and a stress of 10.sup.3 N/m.sup.2 of 2 Ae.sup.(1.6A 10 ) to 10,000 A.The copolymer from which the film is formed is preferably one in which the comonomer contains at least 5 carbon atoms; the comonomer may contain up to 12 carbon atoms. Hexene-1 is the preferred comonomer and can be present in the copolymer in an amount of 6.5 to 16.5%, by weight.The copolymers are readily processed and can be formed into films which combine good stiffness and good impact properties.The copolymers are conveniently prepared using supported transition metal benzyl compounds followed by a total work-up of the polymerization mixture.

Abstract: a process for the separation of diluent from an ethylene polymerization reaction mixture wherein ethylene is copolymerized using as a catalyst an organo-metallic compound supported on an inorganic material. Subsequent to reaction, there is added to the reaction mixture a wetting agent and the diluent is then removed from the reaction mixture by steam distillation to give a product having significant solubility in the diluent.A wide variety of wetting agents may be used, which may be either water-soluble or water-insoluble. However, water soluble wetting agents are much preferred, so that most or at least some of the wetting agent remains in the aqueous phase at the end of the steam distillation step. The wetting agent may also possess hydrocarbon solubility; but this does not appear to be of paramount importance. It should also be stable at the steam distillation temperature and should have low steam volatility.

Abstract: a film formed from a copolyme of ethylene and at least one mono-.alpha.-olefine has a combination of impact strength and stiffness which is such that the function ##EQU1## IS AT LEAST 750. The function is preferably at least 1000 and may be several thousands. The film may also have a high tear strength and good tensile strength.The copolymer from which the film is formed is preferably one in which the comonomer contains at least 5 carbon atoms; the comonomer conveniently contains not more than 12 carbon atoms. The comonomer content of the polymer is typically in the range from 6.5 up to 30%, by weight.The film can be produced by a tubular film technique using a temperature of 170.degree.-300.degree. C, a circumferential expansion of 1.2 to 10.0 times and a draw down of 2.5 to 50 times. The production of the polymeric film can include extruding the ethylene copolymer through an annular dye, maintaining the dye temperature in the range from 170.degree.-300.degree.