[0123]  For example, static mixers or other dynamic mixers  leading to homogenic mixing in, such as, for example, extrud› ers, are suitable for effectively mixing in the inhibitor.  [0124]  One or more aliphatic hydroxydicarboxylic acid(s)  and/or hydroxypolycarboxylic acid(s) or derivative( s) thereof  are added to the reaction mixture (reaction mixture melt) in or  after the last reaction stage of the process according to the  invention. The addition is accordingly preferably effected in  the so-called finish reactor or after the finish reactor, particu› larly preferably after the finish reactor.  [0125]  According to the invention, aliphatic hydroxypoly› carboxylic acid(s) are to be understood as meaning those  having more than two carboxyl groups. In the context of the  invention, aliphatic hydroxypolycarboxylic acid(s) are pref› erably those having three, four or five carboxyl groups. Par› ticularly preferred aliphatic hydroxypolycarboxylic acids are  aliphatic hydroxytricarboxylic acids.  [0126]  In preferred embodiments, one or more aliphatic  hydroxydicarboxylic acid(s) and/or hydroxytricarboxylic  acid(s) or derivative(s) thereof are added to the reaction mix› ture.  [0127]  Derivatives of aliphatic hydroxydicarboxylic acid  (s) and/or hydroxypolycarboxylic acid(s) are to be under› stood as meaning, for example, salts, esters, amides, halides  or anhydrides of the corresponding acids, preferably esters of  the corresponding acids, or carboxylic acids derivatized at the  hydroxyl group, such as, for example, alkoxycarboxylic  acids.  [0128]  Preferred aliphatic hydroxydicarboxylic acids and/  or hydroxypolycarboxylic acids or derivatives thereof are, for  example, those of the general formulae (VI) and (VII),  respectively,  or branched C$_{1 }$-Ccalkyl radical, or an alkali metal cation,  preferably Li+, Na+ or K+, particularly preferably a linear  or branched C$_{1 }$-Ccalkyl.  [0136]  Particularly preferred aliphatic hydroxydicarboxy› lic acids and/or hydroxypolycarboxylic acids or derivatives  thereof are, for example, malic acid, malic acid esters, malic  acidmonoesters, tartaric acid, tartaric acid esters, tartaric acid  monoesters, hydroxymalonic acid or esters thereof, citric acid  or esters thereof. All stereoisomers, mixtures of the stereoi› somers or racemic mixtures and also mixtures of the above› mentioned acids or esters are suitable and are within the scope  of the invention. Tartaric acid or malic acid or derivatives  thereof or mixtures of these are particularly preferred.  [0137]  The aliphatic hydroxydicarboxylic acids and/or  hydroxypolycarboxytic acids or derivatives thereof are used,  for example, in amounts of 5 to 500 ppm, preferably 10 to 300  ppm, particularly preferably 20 to 200 ppm, based on the  polycarbonate, in or after the last reaction stage of the process  according to the invention.  [0138]  By this combination of the addition of at least one  inhibitor in a reaction stage before the last reaction stage and  the addition of at least one aliphatic hydroxydicarboxylic acid  and/or hydroxypolycarboxylic acid or a derivative thereof in  the last reaction stage, it is possible to obtain by means of melt  transesterification processes polycarbonates which lead to  shaped articles having low buildup of electrostatic charge on  the surface during further processing, for example by means  of injection moulding. Such a combination of inhibitors and  additional  aliphatic  hydroxydicarboxylic  acids  and/or  hydroxypolycarboxylic acids or derivatives thereof in this  specific time sequence within the process has not been  described to date in the literature. The effect of the low  buildup of electrostatic charge with little local variation on the  surface of the resulting mouldings or extrudates is all the  more surprising since, for example, the addition of inhibitors  of the abovementioned type before the finish reactor without  the additional addition of at least one aliphatic hydroxydicar› boxylic acid and/or hydroxypolycarboxylic acid or a deriva› tive thereof in the last reaction stage is already known ( cf. for  example EP-A 1 612 231 and DE-A 103 57 161) but has no  positive effect at all on the electrostatic properties of the  resulting mouldings or extrudates.  [0139]  The process according to the invention can be car› ried out batchwise or continuously.  [0140]  After the dihydroxyaryl compounds and diary! car› bonates, optionally with further compounds, such as, for  example, a higher-boiling monohydroxyaryl compound, are  present as a melt, the reaction is started in the presence of at  least one suitable catalyst. The conversion or the molecular  weight is  increased with increasing temperatures and  decreasing pressures in suitable apparatuses and devices by  removing the monohydroxyaryl compound which is being  eliminated until the desired end state, i.e. the desired conver› sion or the desired molecular weight, is reached. Through the  choice of the ratio of dihydroxyaryl compound to diary! car› bonate, of the loss rate of the diary! carbonate on the vapours,  resulting from the choice of the procedure or plant for the  preparation of the polycarbonate, and optionally of further  compounds added, such as, for example, a higher-boiling  monohydroxyaryl compound, the terminal groups are char› acterized in type and concentration.  [0141]  In the context of the invention, C$_{1}$-C$_{4}$ -alkyl, repre› sents, for example, methyl, ethyl, n-propyl, isopropyl, n-bu› tyl, sec-butyl, or tert-butyl; C$_{1 }$-Ccalkyl additionally repre- in which  May 7, 2009  US 2009/0117314 Al  8  [0129]  R 1 ,  R 2 ,  R 3 , independently of one another, represent  a linear or branched, preferably a linear, C$_{1 }$-C$_{10}$-alkylene  radical, particularly preferably a linear or branched, pref› erably linear, C$_{1 }$-Ccalkylene radical,  [0130]  X 1 , X 2 , X 3 , independently of one another, represent  Hor OH, at least one of the radicals X 1, X 2 , X $^{3 }$representing  OH,  [0131]  W represents H, COOH, a carboxylate or alkylcar› boxyl, preferably COOH,  [0132]  n represents an integer from 1 to 3, preferably 1,  [0133]  m represents O or an integer from 1 to 3, preferably  0 or 1,  [0134]  o represents O or an integer from 1 to 3, preferably 0  or 1,  [0135]  R 4 , R 5 , independently of one another, represent a  linear or branched C$_{1 }$-C$_{10}$-alkyl radical, preferably a linear  (VI)  (VII)  xi  x2  x3  I  I  I  HOOC---t R $^{1}$t:;-t  R $^{2}$t;:-t  R$^{3}$i;:-COOH  n  I  m  o  w  xi  x2  x3  I  I  I  R$^{4}$00C---t R $^{1}$t:;-t  R $^{2}$t;:-t  R$^{3}$i;:-COOR 5  n  I  m  o  w 