Abstract: The invention relates to a stabilized peroxydicarbonate preparation and its use in the polymerization or copolymerization of ethylenically unsaturated compounds.

Abstract: A bipolar multi-purpose electrolytic cell for high current loads has a frame, two electrode edge plates with metal electrode sheet, and power supply and of bipolar plates. Each includes a plastic electrode base body with electrode rear spaces and/or with coolings spaces that are incorporated on one or both sides: incorporated supply and discharge lines for the electrolyte solutions and the cooling medium, metal electrode sheets which are applied to both sides of the base body and are solid and/or perforated in the electrochemically active area: electrolyte sealing frames, which rest on the solid metal electrode sheets and which are made of flexible plastic, and: ion exchanger membranes, which rest on the perforated metal electrode sheets and/or on the electrolyte sheets and/or on the electrolyte sealing frames and which are provided for separating the electrode spaces.

Abstract: Olefin polymerization may be catalysed by a wide range of catalytic materials. Described herein is a heterogeneous olefin polymerization catalyst comprising a porous paniculate support material having impregnated therein a metallocene catalyst the metal atom whereof is bound to an amide group which is not bound to an &eegr;-ligand of the metallocene, or the reaction product of a said metallocene catalyst and a co-catalyst.

Abstract: The invention relates to a method of bleaching and/or delignifying cellulose, in which (a) a sodium hydroxide solution and a peroxydisulphate solution are first of all produced by electrolysis of a sulphate, (b) the peroxydisulphate solution is converted by hydrolysis into a Caro's acid/caroate solution, (c) said Caro's acid/caroate solution is left to cool and (d) used immediately as a bleaching solution for bleaching and/or delignifying cellulose, the Caro's acid/caroate solution becoming neutralised upon introduction into the bleaching solution.

Abstract: The new compound t-butylperoxycyclododecyl oxalate is described, as well as a method of preparing it and use of the compound as a polymerization initiator.

Abstract: This invention relates to new metallocenes with mixed substituents and enhanced activity, methods of producing metallocene compounds, and the use of metallocenamide halides for generating an active catalyst system for (co)polymerization reactions.

Abstract: 2,5-dimethyl-2,5-di-t-butylperoxy-hexane is produced by reacting 2,5-dimethyl-1,5-hexadiene with t-butylhydroperoxide under acid catalysis in the presence of an electron pair acceptor Lewis acid in a substantially anhydrous solvent. If one uses technical water-containing t-butylhydroperoxide, the water can be separated, after mixing with the 2,5-dimethyl-1,5-hexadiene, by adding sulfuric acid or calcium chloride and subsequently the electron pair acceptor Lewis acid is added.

Abstract: Disclosed is a catalyst system for the production of ethylene co-polymers by co-polymerisation of ethylene with further polymerisable monomers in the presence of a peroxide catalyst. The catalyst system contains components (A) and (B), component (A) being at least one organo-aluminium compound of the general formula AlR.sub.3, in which R is an alkyl, alkenyl, aryl, aralkyl or cycloalkyl radical, and component (B) is at least one organic peroxide.

Abstract: Disclosed is a process for the preparation of 2,5-dimethyl-2,5-dihydroperoxyhexene by reaction of 2,5-dimethyl-1,5-hexadiene with hydrogen peroxide in an acidic medium. According to this process, the 2,5-dimethyl-2,5-dihydroperoxyhexane can be prepared with good yield and in a technically simple way.

Abstract: A process is disclosed for producing tertiary alcohols by radical addition of secondary alcohols to alkenes. The reaction is carried out as a continuous process in the presence of an organic peroxide as a radical initiator and during a mean contact time of the reaction mixture of up to a maximum of 1 hour.

Abstract: For the production of polyolefins by polymerization of .alpha.-olefins in the presence of a peroxide catalyst a catalyst system is used as the catalyst which is composed of the components (A) and (B) in which:(A) denotes at least one compound selected from the group of organoaluminium compounds of formula AlR3 in which R represents an alkyl, alkenyl, aryl or cycloalkyl group; and(B) denotes at least one organic peroxide.

Abstract: The present invention provides a master batch composition based on elastomeric carriers, comprising an organic peroxide, a plasticizer and a filling material and optionally further additives compatible with the organic peroxide, wherein, in addition to the elastomeric carrier, it contains a polyoctenamer.The present invention also provides a process for the production of a master batch composition, wherein (a) the elastomeric carrier, the polyoctenamer, the plasticizer and optionally a part of the filling material or filling material mixture are homogeneously mixed and thereafter (b) the filling material or the filling material mixture or possibly the remaining amounts thereof, together with the organic peroxide, are incorporated at a temperature below the decomposition temperature of the peroxide.

Abstract: Disclosed is a diacylperoxide vinyl ester of the general formula I ##STR1## in which R is an alkylene residue which can be straight-chained, branched or cyclic and which can contain 2 to 10 C atoms or R is an aryl residue, suitable for copolymerization with olefinic unsaturated monomers under conditions in which they do not yet radically decompose.

Abstract: A method is described for the preparation of solutions containing little or no water of tertiary alkyl hydroperoxides in inert solvents by dewatering with sulfuric acid, according to which one or more inert organic solvents are added to an aqueous solution as well as sulfuric acid in such amount and concentration that in the aqueous phase forming after the mixing followed by separation of the phases there is at least 49% of H.sub.2 SO.sub.4 and the water content in the organic phase amounts to no more than 2.5%.

Abstract: Stable, solid acetyl peroxyborate compounds which are active oxygen-containing compounds derived from acetic acid and boron-oxygen compounds. The compounds of the invention have a peracetic acid content which can be liberated instantly and directly in water with only minor formation of hydrogen peroxide The acetyl peroxyborates of the invention are useful in washing, bleaching and cleaning agent and disinfectant applications and as oxidizing agents in organic synthesis.

Abstract: A process is described for preparing peroxyborate agglomerates having an active oxygen content of at least 14% by weight in which amorphous primary particles composed of peroxyborate prepared by a spray drying process are subjected to compacting pressing-agglomeration. Briquettes, compressed strips and tablets can be obtained which can be comminuted, if desired, to peroxyborate granules of desired particle size and bulk density. Advantageous, optionally colored, peroxyborate agglomerates, particularly peroxyborate granules are prepared. Preferred agglomerates and granules are composed of sodium peroxyborates.

Abstract: A process for preparing microcrystalline perborate hydrate products and highly concentrated, storage stable aqueous solutions used for this purpose which have a stable active oxygen content and a boron content of 3 to 8% by wt. based on the total weight of the solution. The products of the invention are suitable for numerous uses in the field of bleaching agent, disinfectant and liquid detergent formulations, and other fields of use.

Abstract: For the preparation of polyethylenes using a diphenyl ethane derivative as C-C labile polymerization initiator, 1 to 40 mole 3,4-dimethyl-3,4-diphenyl hexane, based on 1 million mole ethylene used, are polymerized at 260.degree. to 400.degree. C. at a pressure of 60,000 to 350,000 kgfa.

Abstract: A process for producing an alkali metal carbonate peroxyhydrate having improved storage stability by mixing particles of an alkali metal carbonate peroxyhydrate with an effective storage stability improving amount of a powdered fatty acid metal salt.

Abstract: A method for further purifying previously distilled hydrogen peroxide for use in microelectronics in which a hydrogen peroxide starting solution purified initially by distillation is contacted, after the addition of a small amount of chelating agent, with a non-ion-exchanging polymeric adsorbent, such as a styrene-divinylbenzene copolymer, to obtain a highly purified hydrogen peroxide solution which satisfies the stringent purity requirements for use in producing 4-megabit and 16-megabit microprocessor chips.