Bayer Aktiengesellschaft

Walter Köhler

Wolfgang Ebert

Martin Döbler

Siegfried Neumann

Peter Bier

Rüdiger Gorny

Annett Konig

The present invention provides an antistatic agent of the formula (I)R&#x2014;SONR'R&#x2033;R&#x2032;&#x2033;R&#x2033;&#x2033; &#x2003;&#x2003;(I)wherein R represents a perfluorinated cyclic or linear, branched or unbranched carbon chain having 1 to 30 carbon atoms, R&#x2032; represents a cyclic or linear, branched or unbranched carbon chain having 1 to 30 carbon atoms, which is unsubstituted or substituted with halogen, hydroxy, cycloalkyl or alkyl, and R&#x2033;, R&#x2032;&#x2033;, R&#x2033;&#x2033; independently represent a cyclic or linear, branched or unbranched carbon chain having 1 to 30 carbon atoms, which is unsubstituted or substituted with halogen, hydroxy, cycloalkyl or alkyl, with the proviso that at least one of the radicals R&#x2032;, R&#x2033;, R&#x2032;&#x2033; and R&#x2033;&#x2033; must not represent ethyl. The antistatic agent of the present invention may be incorporated in plastic molding materials to provide antistatic properties thereto.

Antistatic agent

An agent suitable for imparting antistatic properties to plastics is disclosed. The incorporation of small amounts of perfluoroalkylsulfonic acid salt in plastic resins, notably thermoplastic resins was found to be effective for this purpose.

A process for the production of polysiloxane/polycarbonate block cocondensation products is disclosed. The process comprises reacting in the melt at temperatures of 250 to 320.degree. C. and pressures of 0.01 to 100 mbar (a) a hydroxyaryloxy-terminated dimethylsiloxane with (b) an oligocarbonate. The oligocarbonate is characterized in that its weight average molecular weight is 3000 to 24000 and the molar ratio of its OH end groups to aryl end groups is 10:90 to 70:30. The weight ratio of said (a) to said (b) in the inventive process is between 1:99 and 40:60. Also disclosed are the products prepared by the process.

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Duisburg, Germany

Walter Köhler