| 摘要 |
PURPOSE:To obtain a desensitizer which has an extremely large desensitizing effect, can be printed with an offset press, and is excellent in hydrophobic property, by a method wherein the title desensitizer composition for pressure sensitive copying paper is an alkylene oxide adduct of a specific amine compound, having a compound of which the molecular weight is within a specific range. CONSTITUTION:A desensitizer composition is an alkylene oxide adduct of an amine compound as given by the general formula (1), having a compound of which the molecular weight is 500 to 3,000. In the formula, R1, R2, R4, and R5 are hydrogen or alkylene radical, and at least two radicals among them are hydrogen. R3 is an alkylene radical having a side chain of 3 or more in carbon number. Further, the alkylene oxide herein means propylene oxide, butylene oxide, styrene oxide, etc., which is a mixture of one or two or more kinds of alkylene oxide. The additional order of two or more kinds of alkylene oxide is not specifically limited, and either a block type or a random type may be preferable. The desensitizer composition is high in desensitizing effect and excellent in heat resistance and light fastness. That of which the molecular weight is under 500 is inferior in heat resistnace and light fastness, and the desensitizing effect is decreased for that of over 3,000 in molecular weight. |
