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

(21) Application No.1152/DEL/1999 A (22) Date of filing of Application: 26/08/1999
(54) Title of the invention: “ AN IMPROVED PROCESS FOR THE PREPARATION OF
AQUEOUS EMULSION FROM CASHEWNUT SHELL
LIQUID/CARDANOL BASED RESINS”.
(51) International Classification 7 :
C09J 18502
C09F 7/00
(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 SCIENTIFIC AND INDUSTRIAL
RESEARCH,
Address of the Applicant:
Rafi Marg, New Delhi- 110 001,India.
(72) Name of the Inventor:
CHENNAKKATTU KRISHNA SADASIVAN
PILLAI
JANARDANAN NAIR DEVAKIAMMA SUDHA
VADAKKETHONIPPURATHU SIVANKUTTY NAIR
–PRASAD
PADMANABHAN ANAN DAN.
The present invention relates to a process for the preparation of aqueous emulsion from cashew nut
shell liquid/cardanol based resins. As the aqueous emulsion of cashew nut shell liquid/cardanol
resins particularly of their applications as adhesives are in the plywood and lamination sectors.
The emulsion can substituted phenol-formaldehyde, urea formaldehyde resins used in such
industries. The process of the present invention has essentially the following steps: reacting
CNSL/cardanol with phosphorous pentoxide at ambient temperature for 4 hrs. under stirring and
cooling (the temperature rises due to heat of reaction) it down to 90 0 C when cold water is added
under stirring followed by the addition of emulsifying agent at room temperature and stirring till
emulsification is complete.
18103