24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No.1310/DEL/1998 A (22) Date of filing of Application:15/05/1998
(54) Title of the invention: “A PROCESS FOR THE PREPARATION OF NOVEL ALKYL-
CYCLOALKYL THIOPHENE COPOLYMERS USEFUL FOR
LIGHT EMITTING DIODE APPLICATIONS.”
(51) International Classification 7 :
H01L 21/00
C07D 333/00
(30) Priority Data:
(31) Document No.:
(32) Date :
(33) Name of convention country :
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application
No. : NA
(62) Filed on : NA
(63) Divisional to Application No.
:NIL
(64) Filed on : NA
(57) Abstract:
(71) Name of the applicant:
COUNCIL OF SCEINTIFIC AND INDUSTRIAL
RESEARCH AND TATA INSTITUTE OF
FUNDAMENTAL RESEARCH,
Address of the Applicant:
Rafi Marg, New Delhi- 110 001 and Homi Bhabha Road,
Mumbai - 400 005 .
(72) Name of the Inventor:
NARAYANASASTRI SOMANATHAN
KALATHUR SABDHAM VENGEPURAM
SRINIVASAN
THIRUMALACHARI RAMASAMI
VIBHA RANI
RAJIV PRAKASH
KALATHUR SABDHAM VENGEPURAM
SANTHANAM.
The present invention provides a process for the preparation of novel alkyl- cyhcloalkl thiophene
copolymers useful for light emitting diode applications which comprises synthesizing cyclolalkyl
thiophene and alkyl thiophene by known methods, copolymerising alkyl thiophene and cycloalkyl
thiophene in a ratio ranging from 1:0.1 to 1:10 in an organic solvent in inert atmosphere in the
presence of an oxidizing agent in the range of 1-5 moles per mole of monomer mixture at a
temperature in the range of 0-30 0 C for a period ranging 3-48 hrs; precipitation the copolymer
formed with non solvent as herein described; extracting the copolymer by known method. The
copolymer is useful for light emitting diode applications.
18104