| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a poly isocyanurate-modified isocyanate composition capable of measuring an acidity at once.SOLUTION: The method for producing a poly isocyanurate-modified isocyanate composition includes the steps of: reacting aliphatic and/or alicyclic diisocyanate with a hydroxyl group-containing compound; thereafter isocyanurating by an isocyanuration catalyst in the presence of an acid-base indicator; and detecting an acidity according to a color change extent by the acid-base indicator, whereby an acidity after reaction can be detected at once by the color change extent thereof, it is easy to adjust an isocyanuration catalyst amount to be added, the reaction is easily controlled, and further a reaction time is shortened.SELECTED DRAWING: None |
