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Paramétrages

Paramétrages

1. WO2005061584 - PROCEDE DE PREPARATION D'UN COMPOSE DE MOULAGE D'UN POLYMERE CONDUCTEUR AVEC UNE APTITUDE AU TRAITEMENT AMELIOREE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS:

1. A process for preparation of conducting polymer moulding compound with improved processability which comprises dissolving a doping agent and a monomer in pure solvent, cooling the same to temperature ranging from 2°C to 5°C, adding drop wise an oxidizing agent under agitation, allowing the reaction mixture to remain at temperature ranging from 2°C to 35°C for a period ranging from 4 hours to 10 hrs., precipitating the polymer by dumping the reaction mixture in distilled water and separating the polymer by conventional methods, drying the polymer powder to obtain conducting polyaniline (I), adding (I) to another polymer with low melting point and a dispersing agent, melt extruding the mixture at temperature in the range of 100 to 150°C quenching the extrudate and cutting it to suitable size in the range of 3 to 5 mm to give melt processable conducting polymer compound which can be moulded into different shapes by conventional techniques.

2. A process as claimed in claim 1 wherein, the oxidizing agent contains electron withdrawing groups and may be selected from compounds with dichromate, persulfate and perchlorate ions, benzoyl peroxide and ferric chloride.

3. A process as claimed in claim 1 wherein, the oxidizing agent used is in concentration range of 0.1 molar to 2 molar ratio, preferably 1.1 molar of the reactant concentration.

4. A process as claimed in claim 1 wherein, the doping agent is chosen from substituted sulfonic, phosphoric and carboxylic acids containing alkyl chain with more than 6 carbon atoms.

5. A process as claimed in claim 1 wherein, the solvent used contains polar groups and has high dielectric constant more than 40 and is chosen from solvents such as water, n-methyl pyrrolidone, di-methyl sulfoxide, di-methyl formamide, acetonitrile and methanol or mixtures thereof.

6. A process as claimed in claim 1 wherein, the monomer used may be aromatic compounds containing nitrogen such as aniline or substituted aniline, anisidine, toluidine and their substituted derivatives in the concentration range of 0.01 to 0.5 mol. preferably 0.1 to 0.2 mol.

7. A process as claimed in claim 1 wherein, the second polymer having low melting point has more than two branch points per 1000 units and is chosen from polymers like low density polyethylene, linear low density polyethylene, atactic polypropylene and their co-polymers with butadiene, acrylate, styrene elastomers and rubbers.

8. A process as claimed in claim 1 wherein, the dispersing agent contains ether, acetate or hydroxyl groups and weight average molecular weight in the range of 4000 to 1 ,30000 preferably between 32000 to

64000.

9. A process as claimed in claim 1 wherein, the melt flow of the conducting polymer compound is in the range of 0.4 to 15 g/ 10 min which is suitable for moulding by melt processing techniques.