Hoechst Aktiengesellschaft

Michael Feldhues

Gunther Kampf

Peter Wegener

Thomas Mecklenburg

Heinz Litterer

Takamasa Harada

Dieter Ohlendorf

Claus Escher

Hans-Rolf Dubal

Gerhard Illian

Juergen Lingnau

Mikio Murakami

Ude Scheunemann

Steffen Dapperheld

Frank P Sistig

Guenther Kaempf

Karl Pampus

A coating composition comprising a soluble oligomer of substituted thiophenes and, where appropriate, a soluble polymer gives, applied from the solution in a dipolar aprotic solvent, highly adherent electroconductive coatings on nonconductive or semiconductive materials. In this way, films and fibers having an antistatic finish and moldings for electronics and electrics can be produced.

Electroconductive coating composition, a process for the production

The invention relates to electrically conducting polymers which are obtainable as self-supporting films or composite bodies and which contain structural units which are derived from at least one monomer of the formula (I) ##STR1## wherein R.sup.1 represents a C.sub.1 -C.sub.12 -alkoxy group and R.sup.2 represents a C.sub.1 -C.sub.12 -alkyl group. The invention furthermore relates to a process for preparing said polymers by oxidative polymerization of at least one monomer of said formula (I). The polymers according to the invention may be used, in particular, for applications for which high chemical, mechanical or thermal stability simultaneously accompanied by high electrical conductivity is necessary and of advantage.

Electrically conducting polymers and their preparation

A coating composition comprising a soluble electroconductive polymer of substituted thiophenes and, if appropriate, a soluble non-conductive polymer produces, when applied from the solution in an aprotic solvent, highly adherent, electroconductive coatings on non-conductive or semiconducting materials. In this way, antistatic films and fibers and mouldings for the purposes of electronics and electrics can be produced.

Electroconductive coating composition, a process for the preparation

An electrically conductive resist material is disclosed, comprising at least one polymer which is sensitive to ionizing radiation and a soluble electrically conductive oligomer or polymer. A process for producing the resist material is also described, comprising admixing an electrically conductive oligomer or polymer dissolved in a solvent to at least one polymer which is sensitive to ionizing radiation. The resist material is useful in preparing electron beam resists which prevent electrostatic charging and resultant electrostatic fields.

Electrically conductive resist material, a process for its preparation

Switching and display elements based on ferroelectric liquid-crystals often exhibit a pronounced optical hysteresis which results in the appearance of so-called ghost images. This phenomenon can be markedly reduced or even suppressed if at least one of the two orienting layers are in direct contact with the electrodes and is composed of an electrically conductive polymer of the formula (I): ##STR1## in which R.sup.1, R.sup.2 =independently of each other, H, or straight-chain or branched alkyl or alkoxy containing 1-16 carbon atoms, or halogen,

Electrically conductive polymers and their use as orienting layer in

Selectively dehalogenated thiophene derivatives are obtained from compounds of the formula II ##STR1## by an electrochemical reaction in a divided electrolysis cell in the presence of a suitable solvent, an onium compound or a compound which is converted into an onium compound in the electrolyte, and a conducting salt. Thiophene derivatives are important intermediates in the production of pharmaceuticals and plant protection agents.

Process for the preparation of thiophene derivatives

Electrochemical process for the production of electrically conducting poly(alkoxythiophenes) with carboxylic acids added. Poly(alkoxythiophenes) are of great interest as electrically conducting polymers as a result of their high stability towards air and water and as a result of their good temperature resistance. Suitable for the production of such polymers on an industrial scale is an electrochemical process for the production of electrically conducting poly(alkoxythiophenes) in which the protons needed for the cathode process are made available by adding carboxylic acids to conducting salt and electrolyte solvent. The counterions in the doped polymer originate from the conducting salt, with the result that the properties of the polymer are substantially independent of the proton source.

Electrochemical process for the production of electrically conducting

The invention relates to intrinsically electrically conductive polymers, preferably oligomers, which, in the oxidized form, are completely soluble in dipolar aprotic solvents at room temperature and which contain structural units which are derived from at least one monomer of the formula (I) ##STR1## in which R.sup.1 is a C.sub.1 -C.sub.2 -alkoxy group or --O(CH.sub.2 CH.sub.2 O).sub.n CH.sub.3 with n=1 to 4 and R.sup.2 is a hydrogen atom, a C.sub.1 -C.sub.12 -alkyl group, a C.sub.1 -C.sub.12 -alkoxy group or --O(CH.sub.2 CH.sub.2 O).sub.n CH.sub.3 with n=1 to 4, or R.sup.1 and R.sup.2 together are --O(CH.sub.2).sub.m --CH.sub.2 or --O(CH.sub.2).sub.m --O-- with m=1 to 12. The invention also relates to a process for the preparation of these polymers by electrochemical polymerization of at least one monomer of this formula (I) in the presence of a conductive salt, the anode having a specific surface area of at least 0.01 m.sup.2 /g and preferably a gauze, sponge, fabric or felt structure, the electrolyte solvent being dipolar and aprotic and the electrolyte system being moved only slightly or not at all relative to the anode. The polymers according to the invention can readily be used especially for coating purposes.

Soluble, electrically conductive polymers, process for preparing them,

In electrically conducting polymers in their oxidized (doped) form, which are known per se, the anions can be exchanged in any desired manner, if the polymer in solution is brought into contact with a salt containing the anion to be exchanged and the solution equilibrium is established, taking account of the solubility product of the salts present. In this manner, the properties of the electrically conducting polymers can be adapted to different purposes.

Process for modifying electroconductive polymers using ion exchange

Thiophene ethers having relatively large side chains can be easily obtained by reacting 2-, 3-, 2,3-, 2,4- or 3,4-C.sub.1 -C.sub.3 -alkoxythiophenes in the presence of an acid catalyst with a compound containing an OH group. The novel thiophene ethers are suitable as monomers for electrically conducting polymers.

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Bad Soden am Taunus, Germany

Michael Feldhues