POLYMERES UND SEINE HERSTELLUNG

摘要

1340298 Cross-linkable aromatic polymers E I DU PONT DE NEMOURS & CO 30 June 1972 [1 July 1971] 30839/72 Heading C3R A cross-linkable polymer has the empirical formula where Ar is a perchlorinated divalent aromatic group having at least two aromatic rings, Ar1 is a divalent aromatic group, A is -O- or -S- and x, y and z are such that (y+z)/(x) is from 1À01 to 1À6, the groups -Ar- and being in alternating sequence in the polymer chain, and the polymer having an inherent viscosity of at least 0À2. The polymers are obtained by reacting in solution, in the presence of a base and at 25‹ to 250‹ C., a perchloroaromatic compound Cl-Ar-Cl with a molar excess of 1 to 60 mole per cent of a compound H-A-Ar1-A-H, where Ar and Ar1 are as above. The polymers are cross-linked by heating. In examples polymers are obtained from perchlorobiphenyl and 2,2 - bis(p - hydroxy phenyl) propane and from perchlorobiphenyl and hydroquinone. Uses.-For coating aluminium cooking vessels, as electrical insulation material, sheets, films, tubes and as binders in shaped compositions.