Abstract: A compound of formula (1) or (11): X-A1-(N?N-A2)n-N?N-A3-Y??(1) X-A41-(N?N-A42)n-N?N-A43-Y??(11), -A1- and -A2- being independently a divalent group of an S-containing aromatic heterocyclic ring, with no adjacent non-carbons in the ring, a divalent group of a benzisothiazole ring, or a divalent group of an aromatic hydrocarbon ring, -A3- being a divalent group of an aromatic hydrocarbon ring, —X is a branched alkyl, alkoxy, or alkylsulfanyl group having 3 or more carbon atoms, —Y is a monovalent organic group, n is 1, 2, or 3, when n is 2 or 3, a plurality of -A2-s and/or -A42-s optionally differing, wherein -A1- and -A2- are not both a divalent group of an aromatic hydrocarbon ring, at least one -A42- is a divalent group of an S-containing aromatic heterocyclic ring, -A41- and -A43- are independently a divalent group of an aromatic hydrocarbon ring.

Abstract: In an ink jet recording apparatus having an ink jet recording head for discharging liquid and an ink container for containing the liquid therein, the ink jet recording head and the ink container are communicated with each other by an ink passage, and the ink passage has a separating and connecting portion having a communicating member formed of an elastic material and a fitting portion fitted to the communicating member.

Abstract: An ink tube connecting method in a liquid injection recording apparatus provided with an ink jet recording head unit and an ink tank for storing therein liquid to be supplied to the ink jet recording head unit, and having an ink tube communicating the ink jet recording head unit with the ink tank and an ink tube for discharging the gas and/or liquid in the ink jet recording head unit, is characterized in that a plane formed in the connecting portion of one of the ink tubes while containing the ink tubes and a plane formed in the connecting portion of the other of the ink tubes while containing the ink tubes are arranged without perpendicularly intersecting each other, and the ink tubes are integrally arranged in parallelism to each other in at least a portion thereof. The specification also discloses such liquid injection recording apparatus.