| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a developer compsn. which can be easily electrified into negative charges and which has excellent fixing property at a low temp., transparency and blocking resistance by incorporating a coloring agent and a binder resin which contains a specified acid-added polyether polyol resin as the main component. SOLUTION: This compsn. contains a coloring agent and a binder resin containing an acid-added polyether polyol resin as the main component. The acid-added polyether polyol resin has 2 to 50 acid value, preferably 5 to 30, and 90 to 140 deg.C softening point, preferably 100 to 130 deg.C, and 50 to 90 deg.C glass transition temp., preferably 58 to 80 deg.C. Its number average mol.wt. is about 1000 to 10000, and its weight average mol.wt. is about 2000 to 8000. The acid- added polyether polyol resin is prepared by addition reaction of a polyether polyol resin and acid anhydride.</p> |
