Ink jet recording method, recording unit and ink jet recording apparatus

A recording unit provided with an ink containing portion in which ink is contained and a recording head portion for discharging said ink as ink droplets, wherein:

• said ink is ink containing a coloring material including at least self-dispersing carbon blacks, which are formed of at least one hydrophilic group bonded to a surface of a carbon black directly or via another atom group, and an aqueous medium and further having potassium ions at 0.6% or more in a mass ratio with respect to said carbon black, and
• said recording head includes a discharge portion for discharging liquid droplets having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble.

An ink jet recording apparatus provided with a recording unit having an ink containing portion in which ink is contained and a recording head portion for discharging said ink as ink droplets by an action of energy, wherein:

• said ink is ink containing a coloring material including at least self-dispersing carbon blacks, which are formed of at least one hydrophilic group bonded to a surface of a carbon black directly or via another atom group, and an aqueous medium and further having potassium ions of 0.6% or more in a mass ratio with respect to said carbon black;
• and
• said recording head includes a discharge unit for discharging liquid droplets having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble, and said ink is supplied to said liquid flow path and discharged from said discharge port by thermal energy from said heating element.

An ink jet recording apparatus provided with an ink cartridge including an ink containing portion in which ink is contained and a recording head for discharging said ink as ink droplets by an action of energy, wherein:

• said ink is ink containing a coloring material including at least self-dispersing carbon blacks, which are formed of at least one hydrophilic group bonded to a surface of a carbon black directly or via another atom group, and an aqueous medium and further having potassium ions at 0.6% or more in a mass ratio with respect to said carbon black;
• and
• said recording head includes a discharge portion for discharging liquid droplets having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble, and said ink is supplied to said liquid flow path and discharged from said discharge port by thermal energy from said heating element.

An ink jet recording method having steps of giving energy to ink, discharging the ink from a recording head and depositing said ink on a recording medium, wherein:

• said ink is ink containing self-dispersing pigment having a hydrophilic group as a coloring material and containing counter ions with respect to said hydrophilic group and ions with hydration force lower than that of said hydrophilic group while being in a polarity opposite that of said hydrophilic group in addition to said counter ions;
• and
• said recording head comprises a configuration having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble, and said ink is supplied to said liquid flow path and discharged from said discharge port by thermal energy from said heating element.

A recording unit provided with an ink containing portion in which ink is contained and a recording head portion for discharging said ink as ink droplets, wherein:

• said ink is ink containing self-dispersing pigment having a hydrophilic group as a coloring material and containing counter ions with respect to said hydrophilic group and also ions with hydration force lower than that of said hydrophilic group while being in a polarity opposite that of said hydrophilic group in addition to said counter ions, and
• said recording head comprises an ink jet head having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble.

An ink jet recording apparatus provided with a recording unit having an ink containing portion in which ink is contained and a recording head portion for discharging said ink as ink droplets by an action of energy, wherein:

• said ink is ink containing self-dispersing pigment having a hydrophilic group as a coloring material and containing counter ions with respect to said hydrophilic group and also ions with hydration force lower than that of said hydrophilic group while being in a polarity opposite that of said hydrophilic group in addition to said counter ions;
• and
• said recording head comprises an ink jet head having a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble.

An ink jet recording apparatus provided with an ink cartridge including an ink containing portion in which ink is contained and a recording head for discharging said ink as ink droplets by an action of energy, wherein:

• said ink is ink containing self-dispersing pigment having a hydrophilic group as a coloring material and containing counter tons with respect to said hydrophilic group and ions with hydration force lower than that of said hydrophilic group while being in a polarity opposite that of said hydrophilic group in addition to said counter ions;
• and
• said recording head has a heating element for generating thermal energy for generating a bubble in liquid;
• a discharge port that is a portion for discharging said liquid;
• a liquid flow path communicating to said discharge port and having a bubble generation area for generating a bubble in liquid;
• and a movable member that is provided facing said bubble generation area and is displaced following growth of said bubble.