Abstract: Disclosed is a process for preparing a brominated polystyrene, which comprises reacting a polystyrene dissolved or dispersed in a halogenated hydrocarbon type solvent, with a brominating agent in the presence of an antimony oxide catalyst.

Abstract: A method for continuously producing a composite laminate comprising a thermoplastic synthetic resin sheet and an aluminum sheet laminated on each side of the resin sheet, wherein(1) as the thermoplastic resin sheet, a solid sheet is used,(2) as the aluminum sheet, an aluminum sheet having a thermoplastic adhesive layer provided on its surface is used,(3) two such aluminum sheets with the respective adhesive layers facing to each other, with the thermoplastic synthetic resin sheet interposed therebetween, are fed to hot press bonding rollers, and(4) when they are fed to the hot press bonding rollers, (a) a tension of at least 2 kg/mm.sup.2 is exerted to each aluminum sheet, and (b) the thermoplastic adhesive layer provided on the surface of each aluminum sheet is maintained to be in a molten state.

Abstract: A tetraalkylthiuram disulfide is prepared in a higher yield without formation of by-products by subjecting the corresponding alkali metal dialkyldithiocarbamate to electrolytic oxidation, which is carried out in a two-layer electrolytic solution consisting essentially of either (1) water and carbon disulfide or (2) water and a mixture of carbon disulfide and a halogenated alkane of higher density than water, the carbon disulfide being predominant in the mixture, by means of electrodes placed in the aqueous layer containing the dialkyldithiocarbamate. The resulting disulfide is extracted to the lower layer of the electrolytic solution and is recovered from the layer. The dialkyldithiodicarbamate can be continuously produced in situ by adding carbon disulfide and dialkylamine gradually to the aqueous layer of the electrolytic solution, which contains an alkalimetal hydroxide produced during the electrolytic oxidation of the dialkyldithiocarbamate.

Abstract: A process for producing a tetraalkylthiuram disulfide which comprises electrolytically oxidizing a dialkylammonium dialkyldithiocarbamate having the formula ##STR1## wherein each R represents an alkyl group having from 1 to 4 carbon atoms, in the presence or absence of a supporting electrolyte to produce a tetraalkylthiuram disulfide, the electrolytic oxidation being carried out in one or more solvents which dissolve at least one of the starting dialkylammonium dialkyldithiocarbamate and the resulting tetraalkylthiuram disulfide.