JPH11309856A - Ink jet recording head and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent various troubles due to a bubble in the ink channel of an ink jet recorder while simplifying the assembling process by sustaining hydrophilicity permanently in the ink channel. SOLUTION: In the ink jet recording head being employed in an ink jet recorder, the driving part and a nozzle member are made of resin at the part to be pasted. A highly cationic resin is caused to react on the surface, a hydrophilic organic matter is then caused to react on the surface. A highly cationic resin layer and a hydrophilic organic matter layer on the surface are utilized for bonding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin ink jet recording head used in an ink jet recording apparatus and a method for manufacturing the same.

[0002]

2. Description of the Related Art In an ink jet recording head, it is advantageous to use a resin in almost all parts including an ink flow path, as compared with glass and metal, because processing and assembly are easy and the production cost can be reduced.

However, when an aqueous ink is used for an ink jet recording head using a resin, the surface of the resin is usually highly water-repellent, so that the resin portion is poorly wetted at the portion where the ink contacts the aqueous ink. It is difficult to discharge bubbles even if the bubbles are left in the path or the discharge operation is performed on the bubbles generated in the flow path.

Therefore, in order to improve the wetting of the aqueous ink on the resin surface in the ink flow path, Japanese Patent Application Laid-Open No. 60-24957 discloses a method in which a polar group is formed on the resin surface by an acid treatment, a plasma treatment, or the like to make it hydrophilic. It has been proposed to be. Further, Japanese Patent Publication No. 2-54784 proposes a method in which an aqueous solution of a dye is humidified in contact with an ink flow path surface, and the dye is previously absorbed or penetrated into the flow path surface to improve the wetting. There has also been proposed a method of improving wettability by grafting a hydrophilic polymer to the surface of an ink flow path which is a resin surface in contact with ink.

[0005]

However, in these methods, the treatment for hydrophilizing the two resin surfaces in the first half described above is both temporary and poor in persistence, so that the ink jet recording head is filled with ink. If left unattended, the effect of the hydrophilic treatment in the ink flow path is lost.

In the latter half, the polar groups on the surface are enlarged to prevent burial, so that the effect of the hydrophilization treatment can be expected to have long-lasting effect. It is very difficult to do so, and it may affect the wettability of the nozzle surface and affect the emission characteristics. Further, even if a grafting process is performed before assembling, if an adhesive or the like is used at the time of assembling, it is affected by the water repellency of the adhesive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by maintaining the hydrophilicity in an ink flow path of an ink jet recording head permanently, troubles due to various bubbles in the ink flow path can be prevented. It is an object of the present invention to provide an ink jet recording head which can prevent the ink jet recording and simplify the assembling process, and a method for manufacturing the same.

[0008]

The object of the present invention is achieved by adopting the following constitution.

[1] In an ink jet recording head used in an ink jet recording apparatus, an ink jet recording head in which a driving unit and a nozzle member are bonded together is made of a resin, and a resin having a high cationic property is coated on the surface. An ink jet recording head characterized by reacting and attaching, further reacting a hydrophilic organic substance thereon, and bonding using a highly cationic resin layer and a hydrophilic organic substance layer on the surface of the bonded portion.

[2] The ink jet recording head according to [1], wherein the hydrophilic organic substance is a resin containing an acid anhydride in its structure.

[3] The ink jet recording head according to [1], wherein the hydrophilic organic substance is a resin containing a plurality of carboxyl groups in the structure.

[4] The ink jet recording head according to [1], wherein the hydrophilic organic substance is an acrylic monomer.

[5] In a method of manufacturing an ink jet recording head used in an ink jet recording apparatus, in the ink jet recording head in which a driving portion and a nozzle member are bonded, a portion in contact with the bonded portion and ink is made of resin. A method for producing an ink jet recording head, characterized by reacting and attaching a highly cationic resin, and further reacting a hydrophilic organic substance thereon.

[6] The method for manufacturing an ink jet recording head according to [5], wherein after reacting the hydrophilic organic substance, the substrate is immersed in a liquid containing an alkali metal and washed with pure water.

[7] In an ink jet recording head used for an ink jet recording apparatus, an ink jet recording head in which a driving unit and a nozzle member are bonded together, the bonded portion is made of resin, and graft polymerization is performed on the resin surface. An ink jet recording head which is adhered by utilizing the surface graft polymerized layer.

[8] In a method of manufacturing an ink jet recording head used in an ink jet recording apparatus, an ink jet recording head in which a driving section and a nozzle member are bonded together, the bonded section is made of resin, and graft polymerization is performed on the resin surface; A method for manufacturing an ink jet recording head, characterized in that the bonding is performed by utilizing a surface graft polymer layer of the bonded portion.

The surface treatment of the resin may be performed before assembling the main components of the ink jet recording head, or may be performed after assembling as far as it can be processed.

As shown in the schematic diagram of FIG. 1, the ink ejection principle of the ink jet recording head according to the present invention is as follows. As shown in FIG. Is formed. Incidentally, the ink jet head of the present invention has an ink flow path,
It has an ink introduction path for supplying ink to the ink flow path, a nozzle plate having a nozzle at a position corresponding to the ink flow path, and a driving part in which an electrode film and a resin film are provided in this order on a piezoelectric ceramic substrate. It is.

Hereinafter, the present invention will be further described.

In the present invention, as the material of the ink jet recording head, for example, polyethylene, polypropylene, polystyrene, ABS resin, polyethylene terephthalate, polysulfone, polyamide, polyacetal,
Polycarbonate, polymethyl methacrylate, polyimide, polyarylate, fluoropolymer, urea resin, melamine resin, phenolic resin, polyurethane, vinyl chloride, vinylidene chloride, polyvinyl acetate, epoxy resin, phenolic resin, melamine resin, ABS resin, poly Paraxylylene, chloroprene rubber, SBR, BR,
Examples include NBR, urethane rubber, silicone rubber, and the like.

In the present invention, when the material of the head itself is the above-mentioned resin, the resin may be a material obtained by coating the above-mentioned resin on a material of another material, or a resin made of a constituent member containing the resin. That is, the hydrophobic resin as described above is used for a part of the constituent member, and any part of the constituent member that is in contact with the ink is included.

It is desirable that at least a part of the surface of these resins, which is in contact with the ink of the head, be activated by plasma, ozone, corona discharge or the like before reacting the highly cationic resin.

As a typical example, the following processing can be cited as a specific example by the plasma processing.

(Treatment conditions) Apparatus: Parallel plate reactor Raw material gas: Oxygen gas flow rate: 50 sccm Pressure: 10 Pa Discharge method: High frequency (13.56 MHz, output 200 W) Processing time: 2 minutes Other effective plasma processing Examples include a method using a microwave, and the gas to be used is not limited to oxygen.
Examples thereof include argon, carbon dioxide, ammonia and other gases, or a mixed gas of oxygen and an inert gas.

The highly cationic resin in the present invention is a resin which is positively charged when dissolved in water, and is not particularly limited thereto.
Examples include polyallylamine and polyvinylamine.
The molecular weight is preferably 100 or more in Mn, more preferably 1000 to 100,000 in Mn.

The resin having a high cationicity is a functional group (-COO) present on the surface of the resin portion of the ink jet recording head which has been subjected to plasma treatment, ozone treatment, corona discharge treatment and the like.
H, -OH, -OOH, etc.) and is fixed on the resin surface.

In order to react a highly cationic resin,
Typically, an aqueous solution of polyethyleneimine or polyallylamine is applied, dried, and heat-treated at 40 ° C. or higher. Alternatively, it can be carried out by immersing in the above-mentioned aqueous solution heated to 40 ° C. or higher and then washing with pure water. In this case, an aqueous solution having a concentration of about 0.01 to 5% is often used.

The hydrophilic organic substance is a resin containing an acid anhydride, a resin containing a carboxyl group, or a resin synthesized from an acrylic monomer containing a carboxyl group.
Examples of the resin containing an acid anhydride include methyl vinyl ether /
Copolymers containing maleic anhydride, such as maleic anhydride alternating copolymers, and resins containing carboxyl groups include polyacrylic acid, polymethacrylic acid, etc., and monomers containing carboxyl groups such as acrylic acid, methacrylic acid, and other acrylic resins. Examples of the copolymer of the acid monomer and the acrylic monomer include acrylic acid and methacrylic acid, but are not limited thereto. As for the copolymer, the copolymerization ratio is such that (the structural unit containing an acid anhydride): (the other structural unit) or (the structural unit containing a carboxyl group): (the other structural unit) is 1:99 to 100: 0 is preferred, and more preferably 10:90 to 100: 0.

The molecular weight of the hydrophilic organic substance is 10 in Mn.
00 to 10,000,000, more preferably 1
It is between 000 and 1,000,000.

When an acrylic acid-based monomer polymer is used as the hydrophilic organic substance, a resin having a high cationic property is used as Mn1
It is preferably set to not less than 000. Hydrophilic organic substances react with acid anhydrides and carboxyl groups contained in them, or active double bonds of acrylic monomers, and the highly cationic resin present on the surface of the resin part of the inkjet recording head to fix them on the resin surface. Is done.

In order to react the hydrophilic organic substance, an aqueous solution of, for example, an alternating copolymer of methyl vinyl ether-maleic anhydride, a carboxyvinyl polymer, and methacrylic acid is applied and dried, and is heated to 40 ° C. or more. Or 40 ° C
After immersion in the above-mentioned aqueous solution, washing can be carried out with pure water.

After the reaction of the resin with the hydrophilic organic substance, washing with a liquid containing an alkali metal followed by drying is preferred because the hydrophilic treatment becomes more reliable and its effect is prolonged. At this time, the liquid containing an alkali metal is more preferably alkaline.

In the ink jet recording head, when bonding the drive section and the nozzle member together, it is preferable that the bonded section be sufficiently washed, then given sufficient water, and then pressure-bonded.

On the other hand, in a case where hydrophilicity is obtained by graft polymerization on the surface of a resin according to another embodiment of the present invention, acrylic acid is typically placed on the resin as described above for forming the recording head. , Methacrylic acid, acrylamide, 2-hydroxyethyl methacrylate (HEM
A), 2-hydroxypropyl methacrylate (HPM
A monomer such as A) is grafted.

Whether or not the resin surface is grafted and becomes hydrophilic can be confirmed by measuring the water contact angle by a suitable solution method or the like.

The ink applicable to the ink jet recording head of the present invention is preferably a pigment dye, a disperse dye or a disperse pigment as a colorant in an amount of 3 to 20% by weight; an anionic, nonionic or cationic surfactant in many cases. 0.05 to 5% by weight (in the case of a dispersion system, the dispersing aid is 20 to 120% by weight based on the colorant); urea or an amine is 0.01 to 5% by weight as a humectant; It is an aqueous type containing 5 to 70% by weight of an alcohol or an ether derivative thereof. Among these, it is advantageous to use an anionic or nonionic surfactant as a surfactant and to use a polyhydric alcohol or an ether derivative thereof as a solvent to complement the ejection performance of the ink jet recording head of the present invention.

As the colorant, any known colorant can be used without any particular limitation.

[0038]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto.

Example 1 The polymer modification treatment of the ink flow path and the bonding surface was performed as follows.

A plasma treatment (200 W, 5 min) is applied to the drive unit and the nozzle plate having the nozzle holes, which are protected by applying a masking tape to portions where the polymer modification treatment is not desired.
And polyethyleneimine (trade name: Epomin P-1)
000 Nippon Shokubai Co., Ltd., same hereafter)
dry. After baking at 60 ° C. for 5 hours, it was baked at 100 ° C.
It was washed with a 1N aqueous hydrochloric acid solution, rinsed thoroughly with pure water, and dried.

Subsequently, a methyl vinyl ether-maleic anhydride copolymer (trade name: GANTREZ AN-169)
International Specialty
Products Inc. , Manufactured, same hereafter) 0.5
% Aqueous solution was applied and dried. After baking at 60 ° C. for 8 hours, it was washed with 100 ° C. pure water and dried. The water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity.

Thereafter, the member-attached surface was wetted with pure water to dry the polymer-modified surface while applying pressure while the surface was wet.

Example 2 A plasma treatment (200 W, 5 min) was applied to a driving portion protected by applying a masking tape to portions where polymer modification treatment was not desired and a nozzle plate having nozzle holes, and polyallylamine (trade name: PAA-H) 1% aqueous solution was applied and dried. After baking at 60 ° C for 5 hours, it is washed with 0.1N hydrochloric acid aqueous solution at 100 ° C,
After rinsing well with pure water, it was dried.

Subsequently, a 0.5% aqueous solution of a methyl vinyl ether-maleic anhydride copolymer was applied and dried. 60 ° C
For 8 hours, washed with pure water at 100 ° C., and dried. The water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity.

After that, the member-attached surface was wetted with pure water to dry the polymer-modified surface while applying pressure while the surface was wetted.

Example 3 A plasma treatment (200 W, 5 min) was applied to a drive unit protected by applying a masking tape to a portion where polymer modification treatment was not desired and a nozzle plate having a nozzle hole, and the temperature was 80 ° C.
In a 1% aqueous solution of polyethyleneimine for 30 minutes.

After taking out and rinsing thoroughly with pure water,
It was immersed in a 0.5% aqueous solution of methyl vinyl ether-maleic anhydride copolymer at 60 ° C. for 30 minutes.

After taking out and rinsing thoroughly with pure water and drying, the water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity. Thereafter, the members were joined together in a state where the surface to which the members had been adhered was wetted with pure water and the surface modified with the polymer was moistened, and dried while applying pressure.

Example 4 A plasma treatment (200 W, 5 min) was applied to a drive unit protected by applying a masking tape to a portion where polymer modification treatment was not desired and a nozzle plate having a nozzle hole.
Was immersed in a 1% aqueous solution of polyallylamine for 30 minutes.

After taking out and rinsing, it was immersed in a 0.5% aqueous solution of methyl vinyl ether-maleic anhydride copolymer at 60 ° C. for 30 minutes. After taking out and rinsing thoroughly with pure water and drying, the water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity.

Thereafter, the members were put together and dried while applying pressure while the surface to which the members were attached was moistened with pure water and the surface modified with the polymer was moistened.

Example 5 A plasma treatment (200 W, 5 min) was applied to a drive section protected by applying a masking tape to a portion where polymer modification treatment was not desired and a nozzle plate having a nozzle hole.
In a 1% aqueous solution of polyethyleneimine for 30 minutes.

After taking out and rinsing thoroughly with pure water,
It was immersed in a 0.5% aqueous solution of carboxyvinyl polymer (manufactured by Wako Pure Chemical Industries, Ltd., same hereafter) at 60 ° C. for 30 minutes. After taking out and rinsing thoroughly with pure water and drying, the water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity.

Thereafter, the member-attached surface was wetted with pure water to dry the polymer-modified surface while applying pressure while the surface was wetted.

Example 6 A plasma treatment (200 W, 5 min) was applied to a drive section protected by applying a masking tape to a portion where polymer modification treatment was not desired and a nozzle plate having a nozzle hole, and the temperature was 80 ° C.
In a 1% aqueous solution of polyethyleneimine for 30 minutes.

After taking out and rinsing thoroughly with pure water,
It was immersed in a 10% aqueous solution of methacrylic acid at 60 ° C. for 30 minutes. After taking out and rinsing thoroughly with pure water and drying, the water contact angle was measured by a liquid method, and it was confirmed that the polymer was modified on the surface of the member to impart hydrophilicity. Thereafter, the members were joined together in a state where the surface to which the members had been adhered was wetted with pure water and the surface modified with the polymer was moistened, and dried while applying pressure.

Examples 7 to 12 The members were combined with each of Examples 1 to 6, dried, immersed in a 0.1N NaOH aqueous solution for 2 minutes, sufficiently washed with pure water, and dried.

Examples 13 and 14 Each of Examples 3 and 4 was reacted with a hydrophilic organic substance and washed, then, immersed in a 0.1N NaOH aqueous solution for 2 minutes, washed sufficiently with pure water, and dried. The member-attached surface was wetted with pure water to wet the polymer-modified surface, and the members were combined and dried while applying pressure.

COMPARATIVE EXAMPLE 1 A plasma treatment (200 W, 5 min) was applied to a drive section protected by applying a masking tape to portions where polymer modification treatment was not desired and a nozzle plate having nozzle holes, and a 1% aqueous solution of polyethyleneimine was applied. Dried. After baking at 60 ° C. for 5 hours, it was washed with a 0.1 N hydrochloric acid aqueous solution at 100 ° C., rinsed thoroughly with pure water and dried.

The members to be bonded were dried while applying pressure while the attached surface of the member was wetted with pure water and the surface modified with polymer was moistened.

COMPARATIVE EXAMPLE 2 A plasma treatment (200 W, 5 min) was applied to a driving portion protected by applying a masking tape to portions where polymer modification treatment was not desired and a nozzle plate having nozzle holes, and a 1% aqueous solution of polyallylamine was applied. Dried. Then 60
After baking at 5 ° C. for 5 hours, the substrate was washed with a 0.1N hydrochloric acid aqueous solution at 100 ° C., rinsed thoroughly with pure water and dried.

The member to be bonded was dried while applying pressure while the surface to which the member was attached was wetted with pure water and the surface modified with polymer was moistened.

COMPARATIVE EXAMPLE 3 A plasma treatment (200 W, 5 min) was applied to a drive unit protected by applying a masking tape to a portion where the polymer modification treatment was not desired and a nozzle plate having a nozzle hole, and the plasma treatment was performed.
Immersion in a 0.5% aqueous solution of methyl vinyl ether-maleic anhydride copolymer at 30 ° C. for 30 minutes. The member was sufficiently washed with pure water and dried.

The member to which the member was attached was wetted with pure water and the surface was moistened. The members were combined and dried while applying pressure.

COMPARATIVE EXAMPLE 4 A plasma treatment (200 W, 5 min) was applied to a drive section protected by applying a masking tape to a portion where polymer modification treatment was not desired and a nozzle plate having a nozzle hole.
It was immersed in a 1% aqueous solution of polyethyleneimine at 30 ° C. for 30 minutes.

After taking out and rinsing thoroughly with pure water,
It was immersed in a 10% aqueous solution of acrylamide at 60 ° C. for 30 minutes. Next, the member was sufficiently washed with pure water and dried.

The member to be bonded was dried while applying pressure while the surface to which the member was attached was wetted with pure water and the surface modified with polymer was moistened.

COMPARATIVE EXAMPLE 5 A plasma treatment (200 W, 5 min) was performed on a drive unit protected by applying a masking tape to portions where plasma treatment was not desired and a nozzle plate having a nozzle hole.

The members were put together and dried while applying pressure while the surfaces to which the members were attached were wetted with pure water and the surfaces were moistened.

Both the embodiment and the comparative example were mounted and evaluated based on the amount of ink consumed until ink was put into the recording head from the ink tank and ejected. Further, the force (nozzle plate adhesion) required to peel off the nozzle plate stuck to check the adhesion of the nozzle was evaluated.

The evaluation of the nozzle plate was performed by the following method.

A pull tester TYPE PTR-01 manufactured by RHESCA Company Controller MODEL TB-01 The head to which the nozzle plate is attached is fixed on a stand on the pull tester. Peel off one end of the nozzle plate and insert it with the scissors directly connected to the lifting load sensor. Lift the load sensor unit, peel off the nozzle plate, and measure the load applied at that time. The value at that time was divided by the width of the nozzle plate and converted into a value per unit width (1 mm) to obtain an evaluation value.

[0073]

[Table 1]

As is apparent from Table 1, the ink consumption of Examples 1 to 14 according to the present invention is smaller than that of Comparative Examples 1 to 5 until normal ejection is possible. Often there are few. What should be particularly noted is the characteristics after storage for one month. In this case, there are no exceptions. The characteristics within the present invention are almost the same as those before storage, while those outside the present invention are before storage. It can be seen that those with good characteristics have greatly deteriorated characteristics.

The adhesion within the present invention is 50 without exception.
g / mm or more, which is within the range that can be put into practical use, but many of those outside the present invention have a gage of 50 g / mm or less, which also has a problem. It can be seen that Comparative Examples 1 to 5 other than the present invention did not have good characteristics in terms of the consumed ink amount and the adhesive force.

In particular, it can be seen that the ink consumption characteristics of Examples 13 and 14 which were immersed in a 0.1N NaOH aqueous solution after the treatment and washed with pure water were excellent.

Examples 15 to 21 The graft treatment of the ink flow path and the bonding surface was performed as follows.

A container or a monomer solution is filled in a container and sufficiently degassed to remove dissolved oxygen. A plasma treatment (200 W, 5 min) is performed on the drive unit and the nozzle plate having the nozzle holes, which are protected by applying a masking tape to a portion where the grafting treatment is not desired, and then placed in a vacuum-resistant container and vacuum degassed. The monomer or monomer solution from which dissolved oxygen has been removed by vacuum degassing is placed in this container until the members are immersed. The vessel was sealed in a vacuum and the graft polymerization reaction was allowed to proceed at a suitable temperature for a suitable time depending on the monomer used and the reaction method.

After the driving part and the nozzle plate were sufficiently washed, the water contact angle was measured by a liquid method, and the surface of the driving part and the sticking surface and the surface and the sticking surface of the nozzle plate were graft-polymerized to impart hydrophilicity. It was confirmed. After that, the drive unit and the nozzle plate are combined and dried while applying pressure in a state where the sticking surface is wetted with pure water and the grafted surface is moistened. The amount of ink consumed after mounting and ink can be ejected from the ink tank to the head, and until the ink can be ejected from the ink tank into the head that has been stored in air at normal temperature and pressure for one month. The amount of ink consumed was evaluated. The force required to peel off the attached nozzle plate (adhesive force of the nozzle plate) was evaluated by the same method as described above.

[0080]

[Table 2]

As is clear from Table 2, it can be seen that both of the ink consumption and the adhesive force have sufficiently practical characteristics.

For comparison, the following three types of recording heads were prepared and evaluated.

Comparative Example 6 The drive unit and the nozzle plate used in Example 1 were bonded with an epoxy adhesive (trade name: Epotek 353ND, the same applies hereinafter).

COMPARATIVE EXAMPLE 7 A plasma treatment (200 W, 5 min) was performed on a drive unit protected by applying a masking tape to portions where plasma treatment was not desired and a nozzle plate having nozzle holes. An epoxy-based adhesive is applied to the drive unit, the nozzle plate is aligned, and pressure is applied to adhere and adhere.

Comparative Example 8 After the driving section and the nozzle plate were bonded with an epoxy-based adhesive, a masking tape was applied to a portion where plasma treatment was not desired, and a hydrophilic treatment was performed with plasma.

[0086]

[Table 3]

According to the results shown in Table 3, the ink using the adhesive had a problem in the amount of ink consumed even though the adhesive force was sufficient, and the ink without the graft polymer layer had a problem in the amount of ink consumed and the adhesive force after storage for one month. Since problems arise, it can be seen that none of them is practical.

[0088]

According to the present invention, by maintaining the hydrophilicity in the ink flow path of the ink jet recording head permanently, troubles due to various bubbles in the ink flow path can be prevented beforehand and the assembly process can be simplified. And a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a schematic view of the principle of ink ejection of an ink jet head according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving part 2 Ink 3 Nozzle plate 4 Nozzle 5 Ink drop

Claims (8)

[Claims] 1. An ink jet recording head used in an ink jet recording apparatus, wherein a bonding portion is made of resin in an ink jet recording head in which a driving portion and a nozzle member are bonded, and a highly cationic resin is reacted on the surface. An ink jet recording head, wherein a hydrophilic organic substance is allowed to react thereon and adhered using a highly cationic resin layer and a hydrophilic organic substance layer on the surface of the bonded portion. 2. The ink jet recording head according to claim 1, wherein the hydrophilic organic substance is a resin containing an acid anhydride in a structure. 3. The method according to claim 1, wherein the hydrophilic organic substance is a resin containing a plurality of carboxyl groups in the structure.
The inkjet recording head according to the above. 4. The ink jet recording head according to claim 1, wherein said hydrophilic organic substance is an acrylic monomer. 5. A method of manufacturing an ink jet recording head for use in an ink jet recording apparatus, wherein a portion of the ink jet recording head in which a driving unit and a nozzle member are bonded to each other is in contact with ink, and a surface of the driving unit and the nozzle member are made of a resin. A method for producing an ink jet recording head, characterized in that it is made by reacting a highly reactive resin and then reacting it with a hydrophilic organic substance. 6. The method for manufacturing an ink jet recording head according to claim 5, wherein after the reaction of the hydrophilic organic substance, the substrate is immersed in a liquid containing an alkali metal and washed with pure water. 7. An ink jet recording head used in an ink jet recording apparatus, which is an ink jet recording head in which a driving unit and a nozzle member are bonded together, the bonding unit is made of resin, and graft polymerization is performed on the resin surface. An ink jet recording head which is adhered using a surface graft polymerization layer. 8. A method for manufacturing an ink jet recording head for use in an ink jet recording apparatus, wherein the driving portion and the nozzle member are bonded to each other, the bonded portion is made of a resin, and graft polymerization is performed on the resin surface. A method for manufacturing an ink jet recording head, characterized in that adhesion is performed by using a surface graft polymer layer of a bonding portion.