To obtain an ink holder which is excellent in compression recovery and does not stain ink by forming the holder from a polyurethane foam obtd. by reacting a polyol contg. a thermosetting resin with a polyisocyanate in the presence of a blowing agent, a foam stabilizer, a catalyst, and other auxiliaries.
The ink holder is formed out of a polyurethane foam which has a three-dimensional network structure substantially free of cell membranes, has a 25% compression hardness of 20-70 kgf and a cell count of 30-70/25 mm, and is obtd. by reacting a polyisocyanate with a polyol contg. a thermosetting resin pref. contg. at least either a polyurea resin or a polymelamine resin (e.g. a polyurea-dispersed polyol obtd. by reacting a polyether polyol, an arom. diisocyanate, and a polyamine), pref. a polyol contg. at least one such a polyol in an amt. of at least 30 wt.% based on the total polyol component.
KURITA AKIRA
ACHILLES CORP