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MY102458A - A process for preparing a urea-formaldehyde resin having a very low mole ratio of formaldehyde to urea. - Google Patents

A process for preparing a urea-formaldehyde resin having a very low mole ratio of formaldehyde to urea.

Info

Publication number
MY102458A
MY102458A MYPI87001083A MYPI19871083A MY102458A MY 102458 A MY102458 A MY 102458A MY PI87001083 A MYPI87001083 A MY PI87001083A MY PI19871083 A MYPI19871083 A MY PI19871083A MY 102458 A MY102458 A MY 102458A
Authority
MY
Malaysia
Prior art keywords
urea
formaldehyde
mole ratio
preparing
temperature
Prior art date
Application number
MYPI87001083A
Inventor
Kong Ho Chee
Original Assignee
Enigma Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB08332962A external-priority patent/GB2150939B/en
Application filed by Enigma Nv filed Critical Enigma Nv
Publication of MY102458A publication Critical patent/MY102458A/en

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  • Phenolic Resins Or Amino Resins (AREA)

Abstract

UREA AND FORMALDEHYDE ARE MIXED IN A MOLE RATIO OF ABOUT 1: 2. THE MIXTURE IS CONDENSED FOR 30 MINUTES AT A PH OF 7.0 TO 7.4 AND A TEMPERATURE BETWEEN 80 AND 85?C. THE CONDENSATION IS CONTINUED AT A PH OF 5.8 AT THE SAME TEMPERATURE UNTIL THE VISCOSITY REACHES VALUES BETWEEN 15 AND 50 MPA.S. THE MOLE RATIO OF UREA TO FORMALDEHYDE IS ADJUSTED TO A VALUE OF 1:1.80 TO 1:1.90 BY ADDING UREA.THE CONDENSATION IS CONTINUED UNDER ACIDIC CONDITIONS AT THE SAME TEMPERATURE, UNTIL THE VISCOSITY REACHES VALUES OF 35 TO 80 MPA.S. AT A PH OF 5.8 TO 6.5, THE MOLE RATIO OF UREA TO FORMALDEHYDE IS ADJUSTED TO A VALUE BETWEEN 1.0:1.0 AND 1.0:1.30 BY ADDING UREA. THE TEMPERATURE IS ALLOWED TO DROP FREELY. WHEN THE TEMPERATURE HAS DROPPED TO BELOW 50?C THE PH IS ADJUSTED TO A VALUE OF 7.0 TO 8.0.
MYPI87001083A 1983-12-09 1987-07-23 A process for preparing a urea-formaldehyde resin having a very low mole ratio of formaldehyde to urea. MY102458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08332962A GB2150939B (en) 1983-12-09 1983-12-09 A process for preparing urea-formaldehyde resins

Publications (1)

Publication Number Publication Date
MY102458A true MY102458A (en) 1992-06-30

Family

ID=79646367

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI87001083A MY102458A (en) 1983-12-09 1987-07-23 A process for preparing a urea-formaldehyde resin having a very low mole ratio of formaldehyde to urea.

Country Status (1)

Country Link
MY (1) MY102458A (en)

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