Abstract: The invention relates to an improved process for isolating pulverulent chlorinated aliphatic polymers from their aliphatic chlorohydrocarbon solutions by introducing a mixture of steam and special solvent into said solutions, removing the aliphatic chlorohydrocarbon by steam distillation, and isolating the chlorinated polymer in the customary manner as a solid.The process produces a product which is practically free (.ltoreq.20 ppm) of toxic aliphatic chlorohydrocarbons and can be safely used in paints, adhesives or printing inks.

Abstract: A process for the production of 2-aryl-4-acyl-1.3.4-oxdiazolones-(5), in which an aromatic carboxylic acid hydrazide is reacted at a pH value of from 1.8 to 3.0 with phosgene in a mixture consisting of water and acetone at a temperature of from 0.degree. C. to 50.degree. C., subsequently the pH is increased to from 9.5 to 11.0, then about 100 mol % of a carboxylic acid chloride or about 50 mol % of a dicarboxylic acid chloride (based on mols of carboxylic acid hydrazide) is added and optionally from 10.sup.-4 to 1.0 mol % (based on mols of carboxylic acid hydrazide) of a tertiary amine or phosphine is added as a catalyst and the reaction is completed at a temperature from 0.degree. C. to 50.degree. C.

Abstract: This invention relates to a process for the production of compounds containing at least one (thio)-hydantoin ring in the molecule by reacting a carbodiimide with hydroxy- or mercapto-succinic acid diesters corresponding to the following general formula: ##STR1## wherein R.sup.4 and X are as defined in the description.

Abstract: The invention relates to a process for the production of compounds containing at least one hydantoin ring by reacting a carbodiimide with derivatives of succinic acid anhydride corresponding to the following general formula: ##STR1## wherein R.sup.4 represents a halogen atom, an alkyl-carboxy or aryl-carboxy group; or with maleic acid anhydride in the presence of aromatic OH-functional compounds at temperatures of from about 20.degree. to about 250.degree. C., optionally in a solvent and optionally in the presence of a catalyst, and also to the use of the polyhydantoins obtained, where they have high molecular weights, as high temperature-resistant coating compositions, films, powders, adhesives, lacquers or mouldings.

Abstract: The invention relates to a process for the production of a chlorinated polymer having a chlorine content of from 30 to 70% by weight, which comprises chlorinating a polymer in a chlorinated hydrocarbon solvent, removing the solvent using steam and/or hot water in the presence of at least 1% by weight, based on the chlorinated polymer, of an alkoxylation product of 1 mole of a primary aliphatic alcohol containing at least 8 carbon atoms and at least 1.5 moles of propylene oxide and drying the precipitated chlorinated polymer.

Abstract: A process for the preparation of bisphenols, which comprises condensing an aliphatic or cycloaliphatic ketone with a phenol having a free p-position in the presence, as a condensing agent, of from 0.3 to 3 mols, per mol of ketone, of an aromatic sulphonic acid of the formula (III) or (IV): ##STR1## wherein R.sup.3 is an inert organic radical,o represents an integer from 1 to 4, andp represents 0 or an integer from 1 to 4, and in the presence of an organic solvent, in which the aromatic sulphonic acid is effectively soluble and the bisphenol or the phenol adduct which is produced is as slightly soluble as possible, the reaction being carried out at a temperature at which the produced diphenol crystallises as extensively as possible as such or as a phenol adduct during or at the end of the reaction; isolating the crystalline separated bisphenol or its adduct; and removing the adhering phenol or solvent.

Abstract: In non-phenolic solvents soluble Polyamid-hydantoins optionally containing ester and/or imide and/or isocyanurate groups are obtained by reacting polyisocyanates with polyfunctional amino carboxylic acid derivatives and a compound containing at least a carboxylic group preferably in the presence of a non-phenolic solvent.

Abstract: Polymers comprising terephthalyl-or oxal arylamide groups represent excellent light stabilizers for synthetic, semi-synthetic and/or naturally occurring organic materials.

Abstract: Moulding compositions for the production of mouldings with fire-retarding properties and with a polytriazine structure, comprising mixtures of(A) 10 to 90% by weight of at least one polyfunctional, aromatic halogen-free cyanic acid ester or a prepolymer thereof which is still fusible or soluble in solvents, and(B) 10 to 90% by weight of at least one polyfunctional, aromatic halogen-containing cyanic acid ester or a prepolymer thereof which is still fusible or soluble in solvents.

Abstract: Aromatic cyanic acid esters are obtained by an improved process. Optionally substituted mononuclear phenols or polynuclear phenols optionally interrupted through bridge members such as ##EQU1## and/or divalent hydrocarbon bridges are condensated in form of an aqueous phenolate solution with cyanogen halide dissolved in organic solvents in the presence of catalytic quantities of a tertiary amine in a highly disperse system (two phase boundary reaction).The cyanic acid esters obtained are highly pure and stable.

Abstract: A process for the production of very pure 2,2-bis-(4-hydroxy-3,5-dichlorophenyl)-propane (TCB), wherein a solution of TCB in an aromatic hydrocarbon is treated with hot water, followed by crystallization of TCB from the aqueous solution by addition of a halogenated aliphatic hydrocarbon.