Linear, thermoplastic polyesters and process for their manufacture

Claim 1

A linear, thermoplastic polyester with a high glass transition temperature and a relative viscosity of 1.1 to 4.0 dl/g, measured at 30° C in a 1% solution of equal parts phenol and trichloroethane consisting essentially in the total condensed acid component of (A) 0 to 90 mol % of an acid selected from the group consisting of terephthalic acid and isophthalic acid or a mixture thereof; and of (B) 10 to 100 mol % of a dicarboxylic acid selected from the group consisting of an amidodicarboxylic acid of the formula ##EQU11## wherein x is 0 or 1, E is the --CONH--group the NH group of which is bonded to R 2 or R 3 or optionally to R 1 or R 2 , and each of R 1 , R 2 and R 3 independently is alkylene of 1 to 12 carbon atoms, an aromatic radical phenylene, diphenylene, naphthylene, 4,4'-sulphonediphenyl or ##SPC4## a cycloaliphatic radical ##SPC5## ##SPC6## or ##SPC7## an aromatic-aliphatic radical ##SPC8## or ##SPC9## wherein the methylene groups can be bonded in the meta or para- position or a cycloaliphatic-aliphatic radical ##SPC10## with the proviso that, if x is 1, R 2 cannot be the methylene group when the NH groups of the --CONH groups are bonded to R 2 and that one of R 1 , R 2 and R 3 is an aromatic radical; an imidodicarboxylic acid of the structure N-carboxyalkyl-, N-carboxyphenylalkyl, N-carboxyalkylphenyl- or N-carboxyphenyltrimellitic acid imide or N,N'-carboxyalkyl-, N,N'-carboxyphenylalkyl-, N, N'-carboxyalkylphenyl-, or N, N'-carboxyphenylpyromellitic acid imide; a naphthalene dicarboxylic acid; a carboxyphenylindane carboxylic acid; and a dicarboxylic acid of the general formula ##EQU12## wherein n is 0 or 1, X represents the sulphur or oxygen atom, or the sulphone, methylene, ethylidene or propylidene radical and each of R 4 and R 5 independently represents a carboxylic ring with 4 to 6 members; and in the total condensed diol component of (C) 5 to 100 mol % of a diol selected from the group consisting of a diol of the formula ##EQU13## where X is 0 or 1, R 6 is hydrogen, methyl, ethyl or phenyl, R 7 is hydrogen or together with R 6 is tetramethylene, A represents a radical of the formula ##EQU14## ##SPC11## U 1 represents a radical of the formula ##SPC12## or ##EQU15## wherein each of B 1 and B 2 independently represents hydrogen or alkyl with 1 to 4 carbon atoms; or when X is 0, U 1 can be ##SPC13## and U 2 has the same meaning as U 1 or represents the formula ##EQU16## wherein each of D 1 and D 2 independently represents hydrogen, alkyl with 1 to 4 carbon atoms or phenyl or together D 1 and D 2 are pentamethylene; and of (D) 0 to 95 mol % of a diol selected from the group consisting of an aliphatic diol with 2 to 10 carbon atosm, 1,4-cyclohexanedimethanol and 1,4-cyclohexanediol or a mixture thereof.