Polymeric dispersion of thiophene copolymers and a process for preparation thereof

Patent metadata

Field	Value
Publication number	US-9428603-B2
Application number	US-201514661581-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 18, 2014
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

The present invention provides a process for preparing copolymers, by oxidatively polymerizing thiophene or substituted thiophene such as 3,4-ethylenedioxythiophene or 3-hexyl thiophene in presence of a reactive surfactant, as aqueous dispersions using catalyst such as FeCl 3 and peroxide as the oxidizing agent.

First claim

We claim:

1. A process for preparing a copolymer of at least one type of repeating units of thiophene or substituted thiophene in the presence of a reactive surfactant, wherein the process steps comprise:
(a) dissolving the reactive surfactant in deionized water with stirring to make a homogeneous aqueous mixture;
(b) bubbling N 2 in the homogeneous aqueous mixture obtained in step (a) for a period ranging between 5 minutes to 30 minutes followed addition of a thiophene or substituted thiophene monomer, or a mixture thereof to obtain a mixture;
(c) initiating polymerization in the mixture obtained in step (b) by adding FeCl 3 and H 2 O 2 with stirring for a period in the range of 12 hrs to 24 hrs to obtain a dispersion; and
(d) filtering the dispersion obtained in step (c) and then freeze drying the copolymer to obtain a powder form or optionally in cast film form, wherein the reactive surfactant is incorporated in the backbone of the copolymer with the thiophene or substituted thiophone.

2. The process as claimed in claim 1 , wherein the thiophene or substituted thiophene is selected from the group consisting of thiophene, 3,4-ethylenedioxythiophene, and 3-hexylthiophene.

3. The process as claimed in claim 1 , wherein the yield of the copolymer is in the range of (54-76)%.

4. The process as claimed in claim 1 , wherein the reactive surfactant is sulfonated-3-pentadecyl phenyl acrylate.

Assignees

• Council Scient Ind Res

Inventors

• Kattimuttathu Ittara Suresh
• Reddy Mandapati Venkateswara

Classifications

• C08F228/06 Primary

  by a heterocyclic ring containing sulfur · CPC title

• H01L51/0036

  Electricity · mapped topic

• H01L51/0037

  Electricity · mapped topic

• H01L51/0043

  Electricity · mapped topic

• H10K85/113

  Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene · CPC title