VOLUME 3, TOPIC 15
A. K. Mukerji1
THE PROCESSING AND
APPLICATION OF ALMACIGA
(Agathis philippinensis Warb.)
RESIN FOR PAINTS
Elvira C. Fernandez1
Almaciga resin was purified and modified by the thermal process to convert it to a form
suitable as a component for paint manufacture. In the purification process, the highest yield obtained
for resin was 88.98% and the lowest was 79.9%. The average solvent recovery for the three grades
of resin was 72.1%. A large decrease in percentage yield of modified resin was observed at
higher temperature and longer heating time.
Modified almaciga resin is soluble in drying oils in an acid number of 18. The conditions
for modified almaciga resin soluble in linseed oil were 330°C for four hours; 340°C for two hours
and 350°C for 0.75 hour.
Using Friedman's two-way analysis of variance by ranks, the formulation with 70%
modified almaciga resin and 30% alkyd resin was found comparable in properties to that of the
commercial paint.
Keywords: Agathis, resin, Manila copal, paint
1 Professor, Department of Wood Science and Technology, College of Forestry, University of the Philippines, Philippines.
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