Abstract: A process for the preparation of a dibromopropyl ether compound having a high melting point, which comprises mixing a bis-dibromopropyl ether of tetrabromobisphenol-sulfone or tetrabromobisphenolpropane represented by the following general formula: ##STR1## in the melted state with a crystallized product of said compound at a temperature lower than the melting point of the crystallized product, and holding the mixture at a temperature of 50.degree. to 100.degree. C.According to this process, the dibromopropyl ether compound of a high melting point can be prepared without using an organic solvent.

Abstract: A method for flameproofing cellulosic fibrous materials, which comprises treating a cellulosic fibrous material with a treating liquid comprising 100 parts by weight of an N-hydroxymethyldialkylphosphonopropionamide represented by the following formula: ##STR1## wherein R stands for an alkyl gorup having 1 to 3 carbon atoms, and 10 to 200 parts by weight (as solids) of an antimony oxide sol.

Abstract: Bis-(4-hydroxy-3,5-dibromophenyl) sulfone is converted to an allyl ether in the presence of an alkali with allyl chloride in the presence of a bromide and/or an iodide, and/or a substance capable of forming a bromide and/or an iodide by reaction with the alkali.

Abstract: A flame retardant for polyolefins, which comprises as an effective ingredient a hardly water-soluble or water-insoluble, nitrogen-containing phosphorus compound obtained by mixing 100 parts by weight of a condensed phosphoric acid compound with 10 to 100 parts by weight of a triazine compound and heating the mixture at 100.degree. to 250.degree. C. in the presence or absence of water.

Abstract: An assembly of electrodes suitably for use in electrochemical processes, comprising a plurality of elongated conductive elements as electrodes arranged substantially in parallel in a vertical plane and spaced apart from each other. At least one elongated non-conductive element is interposed between every two adjacent conductive elements. Preferably, both the conductive and non-conductive elements are flexible and the assembly comprises a base fabric of non-conductive material and a plurality of conductive elements incorporated in said base fabric.

Abstract: An assembly of electrodes suitably for use in electrochemical processes, comprising a plurality of elongated conductive elements as electrodes arranged substantially in parallel in a vertical plane and spaced apart from each other. At least one elongated non-conductive element is interposed between every two adjacent conductive elements. Preferably, both the conductive and non-conductive elements are flexible and the assembly comprises a base fabric of non-conductive material and a plurality of conductive elements incorporated in said base fabric.

Abstract: Highly durable flame-retardant thermoplastic polymer compositions contain thermoplastic polymer consisting of an ethylenically unsaturated monomer and from 0.1 to 20%, based on the weight of the thermoplastic polymer, of specific brominated alkoxydiphenyl sulfone derivative of the formula: ##STR1## WHEREIN A is a member selected from the group consisting of a hydrogen atom and allyl, propyl and 2,3-dihalogenopropyl groups, and X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are members selected from the group consisting of chlorine and bromine atoms with at least two of them being bromine atoms.

Abstract: Highly durable flame-retardant polyurethanes can be produced by the process wherein 3 mols of dibromoneopentyl glycol is reacted with 0.5 to 4 mols of phosphoric anhydride, the ester thus obtained is reacted with at least one member selected from the group consisting of alkylene oxides and haloalkylene oxides and then, the phosphorus compound thus obtained, as a portion of a polyhydroxyl component, is incorporated with another polyhydroxyl compound and reacted with a polyisocyanate component in the presence of a catalyst.