Abstract: A method of manufacturing polysuccinimides with molecular weights in the range 100,000 to about 200,000 by polycondensation of aspartic acid, with phosphoric acids as condensation agents, in at least two process stages, at temperatures of 100.degree.-250.degree. C. and under reduced pressure, where in the second stage the mixture containing aspartic acid and phosphoric acid undergoes subsequent condensation following comminution.

Abstract: What are disclosed are aromatic polyethers which are resistant to high temperature, having a reduced viscosity greater than 0.25 dl/g and a repeating structural unit[(A-O).sub.a (B-O).sub.b (C-O).sub.c ],wherein A is 5a,10b-diphenyl-coumarano[2',3',2,3]coumaran of the formula ##STR1## B has the formula ##STR2## wherein n is 0 or 1, and X is ##STR3## and/or ##STR4## and C is at least one further aromatic unit.

Abstract: A method for making aromatic bisphenols such as 9,9-bis-(4-hydroxyphenyl)fluorene by reacting an aromatic ketone, for example a diaryl ketone or diaryl diketone, with a phenol in the present of an insoluble strongly acidic cationic ion exchange resin as an acidic condensation catalyst, which latter may be used in the presence of a co-catalyst containing sulfur.

Abstract: High-temperature-resistant, thermoplastically processable polyarylene ethers with repeating structural units of the general formula ##STR1## wherein A represents 4,4'- or 4,4"-benzophenone units of the formula ##STR2## with z being 0 or 1, B represents 9,9-bis(4'-phenyl)fluorene units of the formula ##STR3## and C represents 2,2-bis(4-phenyl)propane units of the formula ##STR4## which are linked to one another in etherlike fashion through oxygen atoms, the composition of the polyarylene ethers being determined by m and n, the molar ratio of which ranges from 30:70 to 90:10, and wherein the sequence of the segments containing B or C may be random.

Abstract: Branched phosphorus-containing polyarylene ethers comprising repeating units of the structure ##STR1## wherein q and z are 0 or 1; andm has an average value from 1 to 10,statistically alternating with branching points units of the structures ##STR2## p being an integer from 1 to 4, and methods for making such ethers by polycondensing appropriate aromatic bifunctional compounds in the presence of further condensable compounds having more than two reactive groups.

Abstract: Methods for making tertiary phosphine oxides from the corresponding tertiary phosphine sulfides by reacting the latter with sulfuric acid and/or organic sulfonic acids at temperatures from 70.degree. C. to 200.degree. C.

Abstract: A method for making resinous phosphorus-containing polyarylene ethers of the structure ##STR1## wherein R taken alone is hydrogen or R R taken together are a covalent single bond, oxygen, sulfur, or a sulfonyl, carbonyl, methylene or isopropylidene bridge;R' is alkyl or aryl;R" is a single bond, oxygen, sulfur, or an organic group having from 5 to 15 carbon atoms whose free valences emanate from quaternary carbon atoms;E is an end group which is chlorine, hydrogen, alkyl, aryl, or acyl; andn has an average value of at least 10,by polycondensing appropriate bis(chlorophenyl)phosphine oxides with appropriate bisphenols at an elevated temperature in the presence of alkali in reaction times of at least 10 hours, and certain resinous ethers produced by this method.