Abstract: A process for the production of olefin polymers which comprises contacting at least one olefin monomer with an olefin polymerization catalyst comprising:(1) a solid compound of titanium, vanadium or zirconium wherein the metal has a valency below its maximum,(2) a Grignard reagent which is substantially ether free,Mg[Al(C.sub.2 H.sub.5).sub.4 ].sub.2, Mg(C.sub.6 H.sub.5).sub.2,a lithium aluminium tetraalkyl, an aluminium hydrocarbyl halide, an aluminium hydrocarbyl sulphate, an aluminium hydrocarbyl oxyhydrocarbyl, an aluminium trihydrocarbyl or a dihydrocarbyl aluminium hydride, the improvement of adding to the polymerization system up to C.sub.a /f molecular proportions of a trivalent phosphorus compound of the formulaPR'.sub.3-n (X--A--Y).sub.nwhereinR' is halogen, a hydrocarbyl group, the group --NR.sub.2 or the group --OR;x is --O--, --S-- or --NR--;A is a bivalent hydrocarbyl radical such that X and Y are separated by not more than 3 carbon atoms;Y is --OR, --SR, --NR.sub.2, --PR.sub.

Abstract: A method for reducing lace breakage in a process in which a continuous roving is impregnated with a polymer powder before melting and consolidating the impregnated roving, wherein the consolidated lace tension is continuously recorded and the supply of polymer to the roving correspondingly adjusted.

Abstract: A process for the manufacture of a porous diaphragm of a synthetic material, especially polytetrafluoroethylene, which comprises forming a sheet of the synthetic material in admixture with a solid particulate additive (eg starch) to be removed therefrom, introducing said sheet into an electrolytic cell, filling the cell with the working electrolyte and removing the solid particulate in situ in the cell by electrolysing the said electrolyte. The porous diaphragms are especially suitable for use in diaphragm cells for the production of chlorine wherein the working electrolyte is sodium chloride brine.

Abstract: A mattress for civil engineering use, including use in subaqueous structures, comprising two plies of synthetic fabric, one of which is non-woven, the other being woven, said plies being joined through sewn threads along one length of the mattress in parallel lines 10-100 cm apart with at 10-100 cm intervals, 2-8 cm lengths of unsewn threads forming loops for tying on fascines, said mattress being provided with fascines attached by means of said loops.

Abstract: Aromatic hydrocarbons are alkylated in the presence of zeolite nu-1 as catalyst. The invention particularly relates to the production of xylene by the methylation of toluene at temperatures in the range 300.degree. to 600.degree. C, preferably in the range from about 450.degree. to 550.degree. C.

Abstract: Butadiene is converted directly to dicyanobutene by reacting with hydrogen cyanide and oxygen or an oxygen-containing gas in the presence of a catalyst comprising copper ions, chloride and/or bromide ions, and iodide ions, and of a solvent for the catalyst.

Abstract: Solvent mixtures which are eminently useful for the removal of toner from items used in copying and duplicating processes consist of 1,1,2-trichloro-1,2,2-trifluoroethane, acetone and methylal.

Abstract: The disclosure relates to novel 15-(3-aryl- or 3-aralkyl-cyclobutyl, -cyclopentyl and -cyclohexyl)-.omega.-pentanor prostaglandin analogues, for example 9.alpha.,11.alpha.,15.alpha.-trihydroxy-15-(trans-3-phenylcyclobutyl)-16,1 7,18,19,20-pentanor-5-cis,13-trans-prostadienoic acid, to pharmaceutical or veterinary compositions containing such a compound, and to a method of inducing luteolysis in animals by orally administering such a compound.

Abstract: Apparatus for monitoring parameters within an environment which is not readily accessible, for example for monitoring corrosion or deposition within industrial plant, comprises a vibratory element which is resiliently mounted in said environment and vibrated from outside said environment. The apparatus may be used by monitoring the resonant frequency of the vibratory element.

Abstract: A composition obtained by mixing together an aqueous solution or suspension of an ammonium or alkali metal borate and an organic polyisocyanate, and allowing the mixture to set.

Abstract: Phosphorus-containing compounds of the formula ##STR1## WHEREIN R is phenyl or alkyl of 1 to 4 carbon atoms, m and p are each integers from 2 to 6, n and q are each integers from 1 to 10, y is an integer of at least 2, and flame retardant polymers containing such phosphorus-containing compounds.

Abstract: A liquid composition comprising a solution of a water-soluble metal compound convertible to metal oxide and a smaller amount of a hydrolytically stable water-soluble organic silicone which may be used to prepare binders, coatings and shaped bodies, especially fibres, of intimate mixtures of metal oxide and silica. Preferred silicones are polysiloxane, polyoxyalkylene copolymers and preferred metal compounds are salts of aluminium and zirconium. Phase-stabilised alumina, especially in the form of fibres, is a particularly important embodiment; transitional alumina can be stabilised up to 1400.degree. C without the appearance of separate phases of mullite and crystalline silica.

Abstract: Isomerization of alkylbenzene hydrocarbons, for example xylenes, using a silica/alumina catalyst whose alumina content has been reduced by at least 1% of the original alumina content, from an original alumina content in the range 2 to 40% by weight to a content of at least 1% by weight.

Abstract: A process for manufacture of 1-aryl-3-carboxypyrazolid-5-one compounds of the formula: ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each represents H or an alkyl, cycloalkyl, aralkyl or monocyclic aryl group or R.sup.1 and R.sup.2 together form a tetramethylene group; and R represents an aryl group which may be substituted which comprises reacting a hydrazine of the formula R.NH.NH.sub.2 with an ester of the formula: ##STR2## wherein R.sup.3 is an alkyl, cycloalkyl, aralkyl or aryl group, which may be substituted.The novel process provides better yields and simpler operating conditions than other processes described in the literature for manufacture of these pyrazolidones.

Abstract: A polyaryl sulphone made from a reagent of the formulae H--Ar--SO.sub.2.X and/or an equimolar mixture of reagents of the formulae X.SO.sub.2 --Ar--SO.sub.2.X and H--Ar--H, where X is a halogen atom and Ar is a bivalent aromatic radical, tends to suffer from an increase in the viscosity of the melt due to decomposition of terminal sulphonyl halide groups. A polymeric material containing no sulphonyl halide groups is obtained therefrom by reacting the polymer in solution with an organic compound such as aniline or diphenyl ether which will react with sulphonyl halide groups in the polymer to produce groups which are stable at temperatures at which the polymer is molten.

Abstract: The selectivity of unstable alkali metal promoted silver containing olefin oxide production catalysts is restored by wetting them.

Abstract: A process for the cross-linking or chain-extension of hydrocarbon polymers which contain ethylenically unsaturated groups which comprises forming an intimate mixture of the polymer with a mono-sulphonyloxycarbamate of the formula:A -- O -- CO -- NH -- O -- SO.sub.2 R (1)wherein A is an alkyl group, a cycloalkyl group, an alkenyl group, a substituted alkyl group, a substituted aryl group or a heterocyclic group, and R is an optionally substituted alkyl or aryl group.The process is useful for natural and synthetic rubbers. The rate and extent of cross linking may be modified by the additives such as tertiary amines or conventional rubber additives e.g. tetramethyl and zinc diethyl dithiocarbamates, which contain tertiary amino groups.

Abstract: A packaging container comprising a stiff outer casing and a plastics-film liner, the liner comprising a plastics-film bag having one wall formed by overlapping panels, with a filling valve formed in specified manner between the panels in the overlap.

Abstract: Polymeric subbing compositions for polyester photobase, especially polyethylene terephthalate films, comprising, a mixture of a polyurethane resin with a homopolymer or copolymer or a mixture of a homopolymer and a copolymer of an unsaturated cyclic carboxylic acid anhydride, preferably maleic anhydride or itaconic anhydride, in which the mixture contains up to 75% by weight of the anhydride polymer.

Abstract: a process for the manufacture of a foamed thermoplastic aromatic polyethersulphone comprising heating a solid thermoplastic composition comprising an aromatic polyethersulphone which is not in admixture with another type of thermoplastic polymer, said composition containing 0.25 to 20% by weight of an absorbed volatile liquid selected from water, acetone, ethyl acetate, methyl ethyl ketone, methylene chloride and chloroform, to a temperature above (Tg-50).degree. C where Tg is the glass/rubber transition temperature of the thermoplastic polyethersulphone.Preferably the thermoplastic composition contains 0.5 to 20% and particularly 1 to 20% by weight, of the absorbed volatile liquid.The solid thermoplastic composition may be in the form of a powder or granules so as to produce a foamed puff-ball type of structure or it may be in the form of a shaped article such as a sheet, film, coating, moulding or extrusion so as to produce a foamed shaped article.