JPH1134809A - Vehicular wiper blade, and water droplet wiping method for vehicle windshield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To wipe water droplets off a vehicle windshield made of water- repellent glass with wipers while causing no squeals or chattering. SOLUTION: A wiper is provided at its blade lip to be slid on water-repellent glass with a coating for improving the sliding capability. The glass is surface- treated with a repellent including a silicone base resin or fluorocarbon base resin as the base. The blade is molded from natural rubber, synthetic rubber or blend rubber thereof, and the lip is coated with the coating composition. The composition includes a powder component, such as silicone, and a binder component, such as a urethane base resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper blade for removing water droplets attached to a vehicle window glass. The present invention also relates to a method for wiping water drops on a vehicle window glass using such a wiper blade.

[0002]

2. Description of the Related Art A wiper mounted on a vehicle slides a rubber blade (hereinafter, simply referred to as "blade") on the surface of a vehicle window glass (hereinafter, simply referred to as "glass") so that it can be used in rainy weather or the like. Used for physically wiping water films, water droplets, dirt, etc. attached to the glass surface, and when the function of such a wiper is fully exhibited, the driver can see clearly through the glass. And secure and comfortable driving is possible.

[0003] The wiper blade is structurally composed of a lip portion which directly contacts the glass surface and slides,
It comprises a neck portion, which is the narrowest and narrowest portion, a wing portion protruding laterally from the neck portion, and a head portion provided continuously above the neck portion. With such a blade, the edge of the lip of the blade rubs against the glass as the wiper reciprocates.

In such a wiper blade,
Blades made by simply molding a rubber material into a predetermined shape have the property of being too soft and inferior in lubricity on the glass surface, and even if a wiper using such a blade is operated, the glass surface The blade is difficult to slide smoothly. Therefore, the surface treatment of the blade is performed to improve its properties.

[0005] A commonly used method for surface treatment of a blade is a halogenation treatment mainly using a chlorination treatment. In a blade subjected to a halogenation treatment, only the surface of the blade is resinified and hardened. The lubricity and wear resistance have been improved. For this reason, if the glass is normal glass whose surface is not subjected to a water-repellent treatment, the fact that the blade has improved lubricity has penetrated between the edge of the lip and the glass surface. Coupled with the fact that water serves as a lubricant, the blade slides smoothly against the glass, and the blade rarely causes so-called "squealing" or "chatter".

[0006] Further, by adding a powder exhibiting lubricity to the rubber of the blade, the lubricity with the glass surface is improved, and the phenomenon of "squealing" and "chatter" is prevented. (Japanese Patent Laid-Open No. 8-48)
No. 800).

[0007] In recent years, the surface of glass is often coated with a water repellent. If the surface of the glass is water-repellent in this way, the water adhering to the glass during rainy weather is subjected to a water-repelling action and becomes a polka dot, and the polka dot flows off under the influence of the wind received by the glass when the car is running In addition, the transparency of the glass is easily ensured. Therefore, it is not necessary to operate the wiper as long as the transparency of the glass is sufficiently ensured by the water repellent action and wind accompanying the water repellent treatment. Therefore, if the transparency of the glass can be ensured by performing the water repellent treatment on the surface of the glass, for the driver,
This is extremely useful for safe driving because the field of view can be secured for a long time without operating the wiper.

[0008] However, it is difficult for the polka dots to flow off the surface of the glass when the vehicle is not easily affected by the wind, such as when the vehicle is running at a low speed or when the vehicle is stopped. Also,
Dirt such as mud and soil may adhere to the surface of the glass. In these cases, it is necessary to operate the wiper to secure a safe view.

However, in the case of glass whose surface has been subjected to a water-repellent treatment (hereinafter referred to as "water-repellent glass"), the attached water becomes small polka dots due to its surface tension and it is difficult to form a water film. It is no longer possible to expect the effect that water enters between the edge of the lip of the blade and exhibits lubricity. For this reason, in a situation where water adhering to the water-repellent glass is polka dots, the blade does not slide smoothly on the surface of the glass even when the wiper is operated, and the blade "squeals" or " A phenomenon called "chatter" is observed, and if such a phenomenon occurs remarkably, the "chatter" will increase and the blade wiping performance will be extremely poor, so it is necessary to secure the driver's view. Becomes difficult. A similar situation occurs if the blade is halogenated as described above or a solid lubricant is added. Therefore, in order to wipe off the polka dots attached to the water-repellent glass, it is not preferable to apply the wiper using the conventional blade with improved lubricity as it is, and even if such a wiper is applied, it is not sufficient. It is impossible to secure visibility.

[0010]

Therefore, the blade "squeals" when the wiper is operated on the water-repellent glass.
As a countermeasure to reduce or "chatter", the halogenation treatment applied to the blade is made stronger than usual,
It is conceivable to add more powder (solid lubricant) that exhibits lubricity to the rubber of the blade.

[0011] However, when a stronger halogenation treatment is performed, a satisfactory improvement in the sliding performance of the blade is not obtained although the sliding performance of the blade is slightly improved, and the surface of the blade becomes too hard. As a result, the wiping performance is significantly reduced. Further, since the halogenation treatment requires an unsaturated bond in the molecular structure of the rubber, it is required to use a rubber having an unsaturated bond such as natural rubber or SBR as a raw material for the blade. However, rubbers having these unsaturated bonds are inferior in weather resistance, and are susceptible to deterioration especially by the influence of atmospheric ozone, ultraviolet rays and infrared rays. Cracks may occur or the parts may be cut off. With such a blade, it is no longer possible to ensure the driver's view safely regardless of whether it is water-repellent glass or normal glass.

When a solid lubricant such as a powder is added in a larger amount, the hardness of the blade becomes too large and the rubber elasticity is extremely reduced with an increase in the added amount of the solid lubricant. There is a problem that the wiping performance is reduced.

[0013] On the other hand, there is also a method of forming a uniform thin water film containing a surfactant on the surface of a water-repellent glass, thereby securing a uniform field of view. However, since this method mainly uses a surfactant, the water film hardly adheres to the surface of the glass, and the water film is easily washed away by falling rain. There was a problem of disappearance and a problem of a thick and distorted water film during heavy rain, and it was difficult to ensure safe driving in both cases.

As described above, when the polka dots adhering to the water-repellent glass are difficult to flow away, the transparency is impaired, and it is difficult to secure a view, a prima facie to secure the view in the past. Countermeasures were taken, but none of the conventional countermeasures were satisfactory.

In view of the above, the present invention focuses on the combination of water-repellent glass and blade rubber, and secures a safe view by operating the wiper in spite of the fact that the water-repellent glass is used for the vehicle window glass. When it is necessary to wipe off the polka dots adhering to the water-repellent glass with a wiper without squealing or chattering, the driver's visibility is It is an object of the present invention to provide a wiper blade for a vehicle that can secure safety and comfort.

It is another object of the present invention to provide a method for wiping water from a vehicle window glass using such a vehicle wiper blade.

[0017]

A wiper blade for a vehicle according to the present invention is used in combination with a vehicle window glass surface-treated with a water repellent, and has a lip portion which slides on the vehicle window glass. And a coating for improving the slidability.

More specifically, a wiper blade for a vehicle used in combination with a vehicle window glass surface-treated with a silicone-based or fluorine-based water repellent, comprising natural rubber, synthetic rubber or a blend thereof. A rubber material having rubber as a base material is formed and a lip portion sliding with the vehicle window glass is coated with a coating composition, and the coating composition is formed of silicone rubber, molybdenum disulfide, Graphite, boron nitride, nylon, water-absorbent resin, powder component selected from polytetrafluoroethylene resin,
And a binder component selected from a urethane resin, an acrylic resin, and a fluoroolefin-alkyl vinyl ether copolymer.

Further, the method for wiping water drops from a vehicle window glass according to the present invention is intended to improve the slidability on the surface of the vehicle window glass surface-treated with a water repellent when the vehicle is running in rainy weather. The lip portion of the coated blade is slid.

More specifically, the water repellent is a silicone-based or fluorine-based, and the blade is formed of a rubber material whose base material is a natural rubber, a synthetic rubber, or a rubber blended with them. The coating is silicone rubber, molybdenum disulfide, graphite, boron nitride,
Nylon, a water-absorbing resin, a powder component selected from a polytetrafluoroethylene resin, and a urethane resin, an acrylic resin, formed using a coating composition containing a binder component selected from a fluoroolefin-alkyl vinyl ether copolymer. It is.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a wiper blade for a vehicle and a method for wiping water drops on a vehicle window glass according to the present invention will be described below.

The wiper blade for a vehicle according to the present invention comprises:
The lip which is used in combination with the water-repellent glass and slides on the water-repellent glass is provided with a coating for improving the slidability with the water-repellent glass. In the method for wiping water from a vehicle window glass according to the present invention, the lip portion of a blade coated with a coating for improving slidability is slid on the surface of the water-repellent glass during running of the vehicle in rainy weather. You.

In order to properly select a treating agent for water-repellent treatment of the surface of the vehicle window glass, that is, a water-repelling agent, the water-repelling action is maintained for a long period of time and a safe view is secured. Various methods were discussed. As a result, it was found that a water repellent containing a specific component satisfies the requirement.

Specific examples of the water repellent include those whose base is selected from the group consisting of amino-modified polysiloxane, dimethylpolysiloxane, and fluoroalkylsilane.

The fluoroalkylsilane has a general formula CF
₃ (CF ₂ ) nCH ₂ CH ₂ Si (OMe) ₃ or CF
₃ (CF ₂ ) nCH ₂ CH ₂ SiCH ₃ (OMe) ₂
Wherein n is from 5 to 8, and Me is a CH ₃ group or a C ₂ H ₅ group.
What is necessary is just to contain 0.001-5 weight%. Solvents include
The solvent is not particularly limited as long as it is a solvent of an alcohol that dissolves the fluoroalkylsilane.

Further, in order to increase the bonding force with normal glass as compared with the case where fluoroalkylsilane is used,
Hydrolyze the alkoxy group of the fluoroalkylsilane,
A strong acid or strong alkali is an effective catalyst for the purpose of firmly bonding to the OH group on the glass surface. These catalysts may be used to further improve the bonding force with normal glass.

Examples of the fluoroalkylsilane include TSL8257 (trade name, manufactured by Toshiba Silicone Co., Ltd., chemical formula: CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₃ )).
₃ ], trade name TSL8233 [chemical formula CF ₃ (CF ₂ )
₇ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ], trade name TSL8
31 [Chemical formula CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ SiCH
₃ (OCH ₃ ) ₂ ], trade name AY43-158E manufactured by Dow Corning Toray Co., Ltd. [chemical formula CF ₃ (CF ₂ ) ₇
CH ₂ CH ₂ Si (OC ₂ H ₅ ) ₃ ], a brand name KBM7803 manufactured by Shin-Etsu Chemical Co., Ltd. [chemical formula CF ₃ (CF
₂ ) ₇ CH ₂ CH ₂ Si (OCH ₃ ) ₃ ] and the like are commercially available.

Those which act as catalysts for strong acids or strong alkalis are selected from the group consisting of hydrochloric acid, nitric acid, sulfuric acid, aromatic sulfonic acids, aliphatic sulfonic acids, fluorinated sulfonic acids, sodium hydroxide and potassium hydroxide. One or more are selected. Preferred are hydrochloric acid, nitric acid and sulfuric acid.

Examples of the solvent component include alcohols such as methanol, ethanol, n-propanol and isopropyl alcohol. In addition, glycol solvents containing OH groups, aromatic solvents such as toluene and xylene, ester solvents such as ethyl acetate and butyl acetate, and ketone solvents such as acetone and methyl ethyl ketone can also be used.

Alcohols are preferred in terms of preventing a hydrolysis reaction due to a change with time of the alkoxy group in the solution of the fluoroalkylsilane.

Dimethylpolysiloxane has a viscosity of 2-
10,000 cs (having a molecular weight in the range of about 400 to 60,000), particularly preferably about 20 cs (having a molecular weight of about 1100), is used in 0.1 ml.
It is contained in an amount of 1 to 20% by weight, and may have a constant viscosity range or a combination of two or more kinds. Any solvent may be used as long as it dissolves the above dimethylpolysiloxane,
Although not particularly limited, alcoholic solvents are preferred. Part of dimethylpolysiloxane may be replaced by cyclic dimethylpolysiloxane.

Examples of the dimethylpolysiloxane include KF-96 series manufactured by Shin-Etsu Chemical Co., Ltd., SH200 series manufactured by Dow Corning Toray Co., Ltd., and TSF451 series manufactured by Toshiba Silicone Co., Ltd. No. Further, as cyclic dimethylpolysiloxane, trade names KF994 and KF9 manufactured by Shin-Etsu Chemical Co., Ltd.
95, KF9937, trade names SH244, SH344, SH245, DC34 manufactured by Dow Corning Toray Co., Ltd.
5 can be used.

Further, an acid catalyst may be used to improve the bonding strength with glass. As the acid catalyst, sulfuric acid, nitric acid, phosphoric acid, aromatic sulfonic acid, aliphatic sulfonic acid, fluorinated sulfonic acid and hydrochloric acid are suitable.

Examples of the solvent component include benzene, butyl acetate, carbon tetrachloride, ethyl ether, gasoline, hexane, isopropyl alcohol, ethanol, methanol, methyl ethyl ketone, toluene, xylene and the like. A system solvent is preferred.

For the amino-modified polysiloxane, 2
It is sufficient that the viscosity at 5 ° C. is 10 to 10,000 cs, the amine equivalent is in the range of 300 to 10,000, and the addition amount is 0.01 to 10.00% by weight. Any solvent may be used as long as it can dissolve the amino-modified polysiloxane. Generally, water or an alcohol solvent is preferable, and a mixed solvent of these two may be used.

The following can be used as the amino-modified polysiloxane. <Made by Wacker Chemicals East Asia Co., Ltd.> Brand name viscosity (cft / 25 ° C.) Amine equivalent L 655 40 700 WR1100 7000 7000 WR1300 1000 3300 WR1600 1000 1700 <Made by Shin-Etsu Chemical Co., Ltd.> Brand name viscosity (csf / 25) C) Amine equivalent KF-393 60 360 KF-861 3500 2000 KF-857 70 830 KF-852 750 1900 KF-8001 250 1900

Further, an acid can be used to react with the amino-modified polysiloxane to increase the solubility in water. As the acid, an acid such as sulfuric acid or sulfonic acid can be used, but a carboxylic acid such as formic acid is sufficient for safety. Since the acid only acts as a catalyst, it may be present in a small amount.

As the solvent, methanol, ethanol,
Alcohol solvents such as isopropyl alcohol are good, but water is also possible. Of course, a mixture of these alcohol-based solvents and water at an arbitrary ratio may be used.

Next, in order to drastically reduce the frictional resistance of the blade used for the wiper, and to provide a blade having excellent slidability and wiping properties even on a water-repellent glass surface and having excellent durability, the coating composition is used. Various studies were conducted on a specific binder and a specific powder that can be used for the present invention, and the following evaluation was obtained.

The base material of the rubber material for forming the blade may be a natural rubber, a synthetic rubber, or a blend thereof as long as the rubber material has been conventionally used. The rubber material is appropriately selected and added to carbon black, process oil, zinc oxide, stearic acid, an antioxidant, a paraffin wax, a crosslinking agent, a vulcanization accelerator, etc., which are generally used as additives, and molded after kneading. Is done.

Examples of the binder component contained in the coating composition include urethane resins such as oil-modified polyurethane resin, moisture-curable urethane resin, lacquer urethane resin, two-pack urethane resin and block urethane resin, and lacquer acrylic resin. Acrylic resin, such as
Copolymers of fluoroolefins and alkyl vinyl ethers (fluoroolefin-alkyl vinyl ether copolymers) are mentioned. Among them, abrasion resistance, weather resistance, water resistance, flexibility and toughness, heat resistance, adhesion required for blades Considering the properties and the resistance to window washer liquid,
Urethane resins are particularly preferred.

The oil-modified polyurethane resin is a one-part, room temperature drying type, and is dried by oxidative polymerization of a (semi) drying oil with a resin obtained by replacing phthalic anhydride of an alkyd resin with diisocyanate. The molecular weight is between 20,000 and 70,000.

The moisture-curable urethane resin is a one-part, room-temperature curing type, contains NCO in the molecule, and after coating, moisture in the air (moisture) reacts with the isocyanate group to cure to form a coating film. . The molecular weight is between 20,000 and 70,000.

The lacquer type acrylic resin is a one-pack, room-temperature-dry type resin containing acrylic acid and a methacrylic acid derivative, styrene, etc. as main components, and having a molecular weight of 10,000 to 1,000.
00.

The two-pack type urethane resin is a two-pack type resin which is used by blending a polyol and a polyisocyanate.
Polyurethane polyol, chloroprene rubber, acrylic resin and the like can be used. These two-pack resins are solvent-based,
Both solventless types can be used.

The block type urethane resin is a curing agent for a two-part adhesive. A block isocyanate that is inactive at room temperature by blocking the -NCO group of the polyisocyanate with a blocking agent. When heated to a high temperature, it is released and becomes an active NCO group again. Can be used like a resin.

The fluoroolefin-alkyl vinyl ether copolymer is a one-part, room-temperature, dry type, in which the main basic skeleton is an alternating polymer of a fluoroolefin and an alkyl vinyl ether. Molecular weight is 100
00 to 40000. Generally, a fluoroolefin-alkyl vinyl ether copolymer generally contains a hydroxyl group, but the present invention does not matter whether or not a hydroxyl group is present.

The content of these binder components is suitably 0.01 to 30% by weight, particularly preferably 0.1 to 15% by weight, irrespective of the kind of the binder when used as a coating material for a coating agent. It is. If the amount of the binder component is 0.01% by weight or less, the adhesion to the blade is reduced, and the sliding durability is reduced. Also, 3
If the content exceeds 0% by weight, a thick resin layer is formed, the rubber elasticity of the blade is reduced, and the wiping performance is reduced.

As a solvent for the coating composition in which the binder component is dissolved, any solvent can be used as long as the binder component can be dissolved. Examples thereof include alcohols such as methanol, ethanol, and isopropyl alcohol, aromatic solvents such as toluene and xylene, ester solvents such as ethyl acetate and butyl acetate, and ketone solvents such as acetone and methyl ethyl ketone. Considering the solvent evaporation rate as a coating composition, a combination of two or more solvents is also possible.

As the powder component contained in the coating composition, silicone rubber, molybdenum disulfide, graphite, boron nitride, nylon, water-absorbing resin, and polytetrafluoroethylene resin are suitable.
They are used alone or in combination of two or more.

The silicone rubber powder is an organopolysiloxane polymer having a siloxane bond.
It is a fine powder having rubber elasticity in a wide range of 70C to 250C. The average particle size of the silicone rubber powder is preferably 20 μm or less, particularly preferably 1 to 5 μm.

When the silicone rubber powder is used alone, when used alone, 100 parts by weight of the binder component
It is preferably from 10 to 200 parts by weight. If the amount is less than 10 parts by weight, the effect of the slidability of the blade may not be obtained. If the amount exceeds 200 parts by weight, the adhesion between the coating composition and the blade may be reduced or the sliding durability may be reduced. May be done.

When used in combination with another solid lubricant, the amount is preferably 5 to 150 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of slidability may not be obtained. If the amount exceeds 150 parts by weight, adhesion between the coating composition and the blade may be reduced or sliding durability may be reduced. .

It is considered that molybdenum disulfide powder has a hexagonal crystal structure, and interlayer friction occurs due to a weak bonding force between layers of the layered structure, thereby exhibiting low friction characteristics.

The average particle size of the molybdenum disulfide powder is 1
0 μm or less is preferable, and 0.3 μm to 8 μm is particularly preferable.

When used alone, the molybdenum disulfide powder is preferably used in an amount of 10 to 300 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 10 parts by weight, the effect of the slidability may not be obtained.
If the amount exceeds 0 parts by weight, the adhesion to the blade may be reduced, or the sliding durability may be reduced.

When used in combination with another solid lubricant, the amount is preferably 5 to 200 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 200 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

It is considered that graphite powder has a hexagonal crystal structure, and interlayer friction occurs due to a weak bonding force between the layers of the layer structure, thereby exhibiting low friction characteristics.

The average particle size of the graphite powder is 40 μm.
m or less, and particularly preferably 2 to 15 μm.

When the graphite powder is used alone, the mixing ratio is 1 to 100 parts by weight of the binder component.
It is preferably from 0 to 300 parts by weight. If the amount is less than 10 parts by weight, the effect of slidability may not be obtained, and 300
If the amount exceeds the weight part, the adhesion to the blade may be reduced, and the sliding durability may be reduced.

When used in combination with another solid lubricant, the amount is preferably 5 to 200 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 200 parts by weight, the adhesion to the blade may be reduced, or the sliding durability may be reduced.

Boron nitride powder has a hexagonal crystal structure, and it is considered that interlayer shear occurs due to weak bonding force between the layers of the layered structure and exhibits low friction characteristics.

The average particle size of the boron nitride powder is 15 μm
The following is preferable, and 1 to 8 μm is particularly preferable.

The mixing ratio of boron nitride powder is 10 to 10 parts by weight of the binder component when used alone.
Preferably it is 100 parts by weight. If the amount is less than 10 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 100 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

When used in combination with another solid lubricant, the amount is preferably 5 to 50 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 50 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

Nylon powder has properties unique to polyamide, such as heat resistance and chemical resistance, and has specific properties such as compression resistance and non-thermal fluidity due to a crosslinked structure.

As the type of nylon powder, nylon 6 and nylon 12 powders are suitable.

The average particle size of the nylon powder is preferably 30 μm or less, particularly preferably 1 to 15 μm.

When used alone, the mixing ratio of the nylon powder is 10 to 100 parts by weight of the binder component.
Preferably it is 300 parts by weight. If the amount is less than 10 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 300 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

When used in combination with another solid lubricant, the amount is preferably 5 to 200 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 200 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

The polytetrafluoroethylene powder is
It is well known that it can be easily produced by polymerization by a conventionally known method and has a very low coefficient of friction.

The average particle size of the polytetrafluoroethylene powder is preferably 20 μm or less, and 0.5 μm to 5 μm.
Is particularly preferred.

When used alone, the mixing ratio of polytetrafluoroethylene powder is preferably 10 to 200 parts by weight with respect to 100 parts by weight of the binder component. 1
If the amount is less than 0 parts by weight, the effect of slidability may not be obtained. If the amount is more than 200 parts by weight, adhesion to a blade may be reduced or sliding durability may be reduced.

When used in combination with another solid lubricant, the amount is preferably 5 to 100 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 5 parts by weight, the effect of the slidability may not be obtained. If the amount exceeds 100 parts by weight, the adhesion to the blade may be reduced or the sliding durability may be reduced.

The water-absorbent resin powder means that when there is no water, long chains of the resin are entangled and at the same time, the chains are bonded to each other in some places, and the whole is solidified into honey, but each chain has many hydrophilic groups. Because of the presence of water, the chain expands and spreads in the presence of water, creating a net-like state confining water.

The average particle size of the water-absorbing resin powder is 100 μm.
m or less, and particularly preferably 50 μm to 5 μm.

The mixing ratio of the water-absorbing resin powder cannot be used when used alone, since the water-absorbing resin powder itself has almost no self-lubricating performance.

When used as an auxiliary in combination with another solid lubricant, the amount is preferably 2 to 20 parts by weight based on 100 parts by weight of the binder component. If the amount is less than 2 parts by weight, the water retention property which is a characteristic of the water-absorbing resin powder is lost, and the meaning as an auxiliary agent is lost. If the amount exceeds 20 parts by weight, not only the adhesion to the blade is reduced, but also the water-absorbing resin powder itself has almost no self-lubricating performance, so that the sliding property and sliding durability are reduced.

When applying the coating agent of the present invention, the coating composition is spray-coated and dipped,
Various application methods such as brushing can be adopted.

The solvent-containing coating composition may be obtained by volatilizing the solvent and drying or curing. At the time of drying or curing, heating may be used to accelerate the drying or the curing speed.

The coating film thickness on the blade after drying or after curing is preferably 3 to 30 μm, more preferably 5 to 20 μm.
m is particularly preferred.

As the thickness of the coating increases, the ability of the coating to follow the blade, which is the base material, deteriorates, causing cracks in the coating itself, which may lower the wiping performance.
Conversely, the thinner the coating film, the lower the sliding performance may be, so a constant coating film thickness is required.

Hereinafter, preferred embodiments of the present invention will be described.

(1) The coating composition contains 0.01 to 30% by weight of the binder component. (2) The coating composition contains 0.1 to 15% by weight of the binder component. (3) Silicone rubber having an average particle size of 20 μm or less is selected as the powder component of the coating composition. (4) Silicone rubber having an average particle size of 1 to 5 μm is selected as the powder component of the coating composition. (5) As the powder component of the coating composition, silicone rubber is independently selected, and the silicone rubber is used in an amount of 10 to 100 parts by weight of the binder component.
200 parts by weight. (6) The powder component of the coating composition,
Molybdenum disulfide, graphite, boron nitride, nylon, water-absorbing resin, including one or more of polytetrafluoroethylene resin, the total content of those powder components, 100 parts by weight of the binder component 5 to 150 parts by weight. (7) Molybdenum disulfide having an average particle size of 10 μm or less is selected as the powder component of the coating composition. (8) As the powder component of the coating composition, molybdenum disulfide having an average particle diameter of 0.3 μm to 8 μm or less is selected. (9) Molybdenum disulfide alone is selected as the powder component of the coating composition, and the molybdenum disulfide is added in an amount of 1 to 100 parts by weight of the binder component.
0 to 300 parts by weight. (10) As the powder component of the coating composition, graphite having an average particle size of 40 μm or less is selected. (11) As the powder component of the coating composition, graphite having an average particle size of 2 to 15 μm is selected. (12) As the powder component of the coating composition, graphite alone is selected, and the graphite is used in an amount of 10 to 3 with respect to 100 parts by weight of the binder component.
00 parts by weight. (13) As the powder component of the coating composition, boron nitride having an average particle size of 15 μm or less is selected. (14) As the powder component of the coating composition, boron nitride having an average particle size of 1 to 8 μm is selected. (15) As the powder component of the coating composition, boron nitride alone is selected, and the boron nitride is
10 to 100 parts by weight based on 100 parts by weight of the binder component
Parts by weight are included. (16) As the powder component of the coating composition, nylon having an average particle size of 30 μm or less is selected. (17) Nylon having an average particle size of 1 to 15 μm is selected as the powder component of the coating composition. (18) Nylon is independently selected as the powder component of the coating composition, and the nylon is contained in an amount of 10 to 300 parts by weight based on 100 parts by weight of the binder component. (19) As the powder component of the coating composition, a polytetrafluoroethylene resin having an average particle size of 20 μm or less is selected. (20) A polytetrafluoroethylene resin having an average particle size of 0.5 to 5 μm is selected as the powder component of the coating composition. (21) As the powder component of the coating composition, a polytetrafluoroethylene resin is independently selected, and the polytetrafluoroethylene resin is contained in an amount of 10 to 200 parts by weight based on 100 parts by weight of the binder component. . (22) As the powder component of the coating composition, a water-absorbent resin having an average particle size of 100 μm or less is selected. (23) As the powder component of the coating composition, a water-absorbent resin having an average particle size of 50 to 5 μm is selected. (24) When a water-absorbing resin is used as an auxiliary agent in combination with another solid lubricant as the powder component of the coating composition, the water-absorbing resin is used in an amount of 2 parts by weight based on 100 parts by weight of the binder component. -20 parts by weight. (25) The coating composition is coated on at least the lip by an application method selected from spray application, dipping, and brush application. (26) The thickness of the coating is 3 to 30 μm. (27) The coating has a thickness of 5 to 20 μm.

[0085]

【Example】

<Manufacture of blade>
Vulcanized for 15 minutes and uncoated (untreated blade was formed. Blade A Blade B (no coating) (no coating) Natural rubber 100 60 Styrene butadiene rubber -40 Stearic acid 1.0 1.0 Zinc white 3 No. 5.0 5.0 Process oil 10.0 10.0 Carbon black 50.0 50.0 Powdered paraffin 1.5 1.5 Antioxidant 2.0 2.0 Vulcanization accelerator 1.8 1.8 Sulfur 2.0 2.0

Next, in order to chlorinate the surface of the blade, 5 g of powder exposed to 10 g of water and 5 g of 12N hydrochloric acid were added.
ml, and the blade was immersed in this solution for 3 minutes to perform a surface treatment.

Similarly, using EPDM, the mixture was kneaded according to the following formulation, and heated at 160 ° C. for 30 minutes to form a blade. Blade C (no coating) EPDM 100.0 Stearic acid 1.0 Zinc flower No.3 5.0 Process oil 10.0 Carbon black 50.0 Peroxide 2.0

The blades A, B, and C thus obtained were manufactured as blade invention products and blade comparison products described below.

[Production of Blade Inventive Product 1] 100 parts by weight of a polyurethane resin (trade name: D6-439, Dainippon Ink and Chemicals, Inc.) was diluted with 350 parts by weight of methyl ethyl ketone, and silicone rubber powder 10 was added to the solution.
Parts by weight (trade name KMP594 Shin-Etsu Chemical Co., Ltd.)
Polytetrafluoroethylene (trade name Lubron L-2
20 parts by weight of Daikin Industries, Ltd., 10 parts by weight of graphite (ACP Nippon Graphite Industry Co., Ltd.), 15 parts by weight of molybdenum disulfide (Mori Powder A, Nippon Graphite Industry Co., Ltd.), nylon powder (product) A coating composition was produced by mixing and dispersing 20 parts by weight of Orgasol 2001UD Nippon Rilsan Co., Ltd. A curing agent (trade name D)
N980 Dainippon Ink and Chemicals Co., Ltd. (60 parts by weight) is added, and the lip portions of the blades A, B, and C are coated (applied) using a spray so that the film thickness after drying and curing becomes 15 μm. ) And after application, cured at 80 ° C. for 30 minutes. After 30 minutes, a blade coated with a lip was obtained (Blade Invention Product 1).

[Production of Inventive Blade 2] 100 parts by weight of a lacquer type urethane resin (trade name: Vernock 16-416, Dainippon Ink & Chemicals, Inc.) was diluted with 300 parts by weight of toluene and 100 parts by weight of xylene, and the solution was diluted. Polytetrafluoroethylene inside (trade name KTL-500F)
(Kitamura Co., Ltd.) 5 parts by weight, graphite (trade name CP)
5 parts by weight of Nippon Graphite Industry Co., Ltd., 5 parts by weight of molybdenum disulfide (trade name: A Japan Molybdenum Co., Ltd.), 30 parts by weight of nylon powder (trade name: Orgasol 200 / UD, Nippon Rilsan Co., Ltd.), water absorption A coating composition was produced by mixing and dispersing 10 parts by weight of a resin powder (trade name: Sumikagel SP-510, Sumitomo Chemical Co., Ltd.). This coating composition is coated on each lip portion of the above blades A, B, and C using a spray so that the film thickness after drying and curing is 20 μm, and the coating is dried to obtain a blade with the lip portion coated. Was obtained (Inventive Blade 2).

[Production of Blade Invention Product 3] 100 parts by weight of an oil-modified polyurethane resin (trade name: Vernock TD-125, Dainippon Ink and Chemicals, Inc.) was diluted with 500 parts by weight of xylene, and polytetrafluoroethylene was added to the solution. Ethylene (brand name Lubron L-5 Daikin Industries, Ltd.) 10
0 parts by weight, graphite (trade name CP Nippon Graphite Industry Co., Ltd.) 200 parts by weight, and boron nitride (trade name SHOBN UHP S-1 Showa Denko KK) 50 parts by weight are mixed and dispersed to be coated. A composition was prepared. This coating composition was applied to the above blade A,
Each of the lip portions B and C was coated with a spray so that the film thickness after drying and curing became 5 μm, and was dried to obtain a blade coated with the lip portion (blade invention product 3).

[Production of Inventive Blade 4] 100 parts by weight of a lacquer type acrylic resin (trade name: FL-121, Dainippon Ink and Chemicals, Inc.) was diluted with 1500 parts by weight of xylene and 1500 parts by weight of toluene. 8 parts by weight of polytetrafluoroethylene (trade name Lubron L-2 Daikin Industries, Ltd.) and graphite (trade name ACP
Nippon Graphite Industry Co., Ltd. 10 parts by weight, silicone rubber powder (KMP594 Shin-Etsu Chemical Co., Ltd.) 7 parts by weight, molybdenum disulfide (trade name A Nippon Molybdenum Co.) 6 parts by weight, nylon powder (product) Name SP-5
00 Toray Industries, Inc. 12 parts by weight, boron nitride (trade name)
SHOBY N UHP S-1 Showa Denko KK 15
5 parts by weight of a water-absorbent resin powder (trade name: SP-510, Sumitomo Chemical Co., Ltd.) was mixed and dispersed to prepare a coating composition. This coating composition is applied to each lip of blades A, B and C described above.
Using a spray, coating was performed so that the film thickness after drying and curing became 18 μm, and the coating was air-dried to obtain a blade coated with a lip (Blade Invention Product 4).

[Production of Inventive Blade 5] 100 parts by weight of a block type urethane resin (trade name: D-500, Dainippon Ink and Chemicals, Inc.) was diluted with 700 parts by weight of ethyl acetate, and graphite (commercially available) was added to the solution. A coating composition was manufactured by mixing and dispersing 300 parts by weight of Mei CP Nippon Graphite Industry Co., Ltd. This coating composition was coated on each lip of the blades A, B, and C using a spray so that the film thickness after drying and curing was 30 μm, and after application, the coating was cured at 80 ° C. for 30 minutes. . After 30 minutes, a blade coated on the lip was obtained (Inventive Blade 5).

[Production of Blade Invention Product 6] 100 parts by weight of a moisture-curable urethane resin (trade name: DM-652, Dainippon Ink and Chemicals, Inc.) was diluted with 400 parts by weight of xylene and 400 parts by weight of cellosolve acetate. Molybdenum disulfide in the solution (trade name A Nihon Molybdenum Co., Ltd.)
10 parts by weight were mixed and dispersed to prepare a coating composition. This coating composition is coated on each lip of the blades A, B, and C using a spray so that the film thickness after drying and curing becomes 3 μm, and after application, the coating is dried to form a lip. The resulting blade was obtained (blade invention product 6).

[Production of Inventive Blade 7] 100 parts by weight of a fluoroolefin-alkyl vinyl ether copolymer resin (trade name: Lumiflon LF-400 Asahi Glass Co., Ltd.) is 1,000 parts by weight of xylene, 500 parts by weight of toluene, and 500 parts by weight of methyl ethyl ketone. And 15 parts by weight of silicone rubber powder (trade name KMP59)
4 Shin-Etsu Chemical Co., Ltd.), polytetrafluoroethylene (trade name: Lubron L-2 Daikin Industries, Ltd.) 15
Parts by weight, 15 parts by weight of molybdenum disulfide (trade name: Moly Powder A Nippon Graphite Industry Co., Ltd.), 15 parts by weight of nylon powder (trade name: SP-500 Toray Industries, Inc.), boron nitride (trade name: SHOBN UHP S) -1 Showa Denko Co., Ltd. 15 parts by weight, graphite (trade name CP Nippon Graphite Industry Co., Ltd.) 15 parts by weight, water-absorbing resin powder (trade name Sumikagel SP-510 Sumitomo Chemical Co., Ltd.) 1
A coating composition was prepared by mixing and dispersing 0 parts by weight. This coating composition is applied only to the lip portions of the blades A, B, and C by a brush so that the film thickness after drying and curing becomes 20 μm, and the coating is dried at 50 ° C. for 20 minutes and then dried. A blade coated with a part was obtained (Blade Invention Product 7).

[Production of Blade Comparative Product 1] A lacquer type acrylic resin (trade name: FL-121, Dainippon Ink and Chemicals, Inc.) alone was used as a coating composition. The coating composition was applied to each lip of the blades A, B, and C by spraying, and the film thickness after drying and curing was 18 μm.
The coating was dried so as to obtain a blade coated with a lip (blade comparative product 1).

[Production of Blade Comparative Product 2] 100 parts by weight of an oil-modified polyurethane resin (trade name: Vernock TD-125, Dainippon Ink and Chemicals, Inc.) was diluted with 500 parts by weight of xylene, and polytetrafluoroethylene was added to the solution. Ethylene (trade name: Lubron L-5 Daikin Industries, Ltd.) 50
0 parts by weight were mixed and dispersed to prepare a coating composition. The coating composition is applied to each lip of the blades A, B, and C by using a spray.
Coating was performed so that the film thickness after drying and curing became 15 μm, and the coating was air-dried to obtain a blade coated with a lip (Blade Comparative Product 2).

[Production of Blade Comparative Product 3] Toluene 30
0 parts by weight, 300 parts by weight of xylene, 10 parts by weight of polytetrafluoroethylene (trade name: KTL-500F, Kitamura Co., Ltd.), 15 parts by weight of graphite (trade name: CP Nippon Graphite Industry Co., Ltd.), molybdenum disulfide (Product name A
10 parts by weight of Nippon Molybdenum Co., Ltd., 15 parts by weight of nylon powder (trade name: Orgasol 200 / UD Nippon Rilsan Co., Ltd.), 3 parts by weight of water-absorbent resin powder (trade name: Sumikagel SP-510 Sumitomo Chemical Co., Ltd.) The coating composition was prepared by mixing and dispersing the parts. This coating composition was applied to the above blade A,
Each of the lip portions B and C was coated by using a spray so that the film thickness after drying and curing became 20 μm, and was dried to obtain a blade having a lip portion coated (Blade Comparative Product 3).

[Production of blade comparative product 4] 100 parts by weight of a moisture-curable urethane resin (trade name: MD-652, Dainippon Ink and Chemicals, Inc.) was diluted with 400 parts by weight of xylene and 400 parts by weight of cellosolve acetate. Molybdenum disulfide in the solution (trade name A Nihon Molybdenum Co., Ltd.)
0.5 parts by weight, 1 part by weight of polytetrafluoroethylene (trade name: Lubron L-2 Daikin Industries, Ltd.), 2 parts by weight of silicone rubber powder (trade name: KMP594 Shin-Etsu Chemical Co., Ltd.), boron nitride (trade name) By mixing and dispersing 0.5 parts by weight of SHOBN UHP S-1 Showa Denko KK and 0.1 parts by weight of a water-absorbing resin powder (trade name: Sumikagel SP-510 Sumitomo Chemical Co., Ltd.). A coating composition was prepared. This coating composition is coated on each lip of the blades A, B, and C using a spray so that the film thickness after drying and curing becomes 10 μm, and after application, the coating is dried to form a lip. The obtained blade was obtained (blade comparative product 4).

[Production of Blade Comparative Product 5] 100 parts by weight of a lacquer type acrylic resin (trade name: FL-121, Dainippon Ink and Chemicals, Inc.) was diluted with 1000 parts by weight of xylene and 1,000 parts by weight of toluene. 10 parts by weight of polytetrafluoroethylene (trade name Lubron L-5 Daikin Industries, Ltd.) and graphite (trade name ACP
Nippon Graphite Industry Co., Ltd.) 10 parts by weight, silicone rubber powder (brand name KMP594 Shin-Etsu Chemical Co., Ltd.) 8
A coating composition was prepared by dispersing 15 parts by weight of a nylon powder (trade name: SP-500, Toray Industries, Inc.). This coating composition is coated on each lip portion of the above blades A, B, and C by using a spray so that the film thickness after drying and curing becomes 55 μm, and the coating composition is allowed to dry. (Blade comparative product 5).

[Production of blade comparative product 6] 100 parts by weight of a lacquer type acrylic resin (trade name: FL-121, Dainippon Ink and Chemicals, Inc.) was diluted with 1000 parts by weight of xylene and 1,000 parts by weight of toluene. Was mixed with 100 parts by weight of graphite (trade name: ACP Nippon Graphite Industry Co., Ltd.) and dispersed to produce a coating composition. This coating composition is coated on each lip of the blades A, B, and C using a spray so that the film thickness after drying and curing becomes 1 μm, and after application, the coating is dried to form a lip. The obtained blade was obtained (blade comparative product 6).

<Preparation of Water Repellent or Surfactant> The following water repellent invention products, comparative water repellent products and comparative surfactant products were prepared. [Preparation of Water Repellent Invention Product A] Amino-modified polysiloxane (trade name: L-655) 2.0% by weight 88% Formic acid 0.5% by weight Isopropyl alcohol 92.5% by weight Deionized water 5.0% by weight A water repellent (glass water repellent coating agent) using an amino-modified polysiloxane was prepared by mixing (water repellent invention product A).

[Preparation of Water Repellent Invention Product B] C ₈ F ₁₇ C ₂ H ₄ Si (OC ₂ H ₅ ) ₃ 2.0 wt% 98% sulfuric acid 0.1 wt% isopropyl alcohol 97.9 wt% A water repellent using a fluoroalkylsilane was prepared by blending (water repellent invention product B).

[Preparation of Water Repellent Invention Product C] Polydimethylsilicone oil (trade name KF96: 20 cs) 2.0% by weight Polydimethylsilicone oil (trade name KF96: 10cs) 1.0% by weight Cyclic silicone (trade name) KF994) 0.5% by weight 98% Sulfuric acid 0.2% by weight Ethanol 50.0% by weight Isopropyl alcohol 46.3% by weight A water repellent using polydimethylsilicone oil was prepared by blending the above (water repellent invention product). C).

[Preparation of Water Repellent Comparative Product A] Amino-modified polysiloxane (trade name: L-655) 11.0% by weight 88% Formic acid 2.8% by weight Isopropyl alcohol 81.2% by weight Deionized water 5.0 % By weight A water repellent using the amino-modified polysiloxane was prepared according to the above formulation (water repellent comparative product A).

[Preparation of Water Repellent Comparative Product B] Polydimethyl silicone oil (trade name: KF96: 20cs) 0.05% by weight 98% Sulfuric acid 0.005% by weight Ethanol 60.0% by weight Isopropyl alcohol 39.945% by weight A water repellent using polydimethyl silicone oil was prepared according to the above formulation (Comparative product of water repellent B).

[Preparation of Surfactant Comparative Product C] Ethanol 49.0% by weight Isopropyl alcohol 49.0% by weight Surfactant (trade name Nonipol 60) 2.0% by weight A water-repellent component is contained by mixing at least 2.0% by weight. No surfactant comparative solution was prepared (surfactant comparative C).

[Test Method] JIS D-5710-4.
The test was performed using the items of the wiping performance of No. 2 and the wiping performance test of 7.2. Tests were performed using the apparatus of FIG. 3 at 7.2. The water repellent invention product, the water repellent comparative product or the surfactant comparative product was coated on the surface of the glass of the apparatus.

The evaluation items were as follows: smooth operation, presence or absence of remarkable chatter and abnormal sound, and wiping performance (number of remaining unwiped lines of water droplets): initial, 100,000, 200,000, and 300,000 times after sliding, respectively. , 400,000 times, and 500,000 times.

As to whether or not the smooth operation is possible, “Yes” is indicated by “Yes”, and “No” is indicated by “X”.
The absence was indicated by ○, the presence or absence of abnormal sound was indicated by ×, and the absence was indicated by ○.

Regarding the wiping performance, JIS D-571 was used.
0 The investigation was performed according to the item of “4.2 Wiping performance”. JI
The item of SD-5710 "4.2 Wiping performance" specifies the wiping performance of the blade and the arm, operates smoothly, has no remarkable chatter and abnormal noise, and the number of unwiped lines of water droplets is as shown below. The following are accepted.

<M zone book> Hair line heavy line wide line Initial wiping performance 3 10 Wiping performance after durability test 5 20 <S zone book> Hair line heavy line wide line Initial wiping performance 5 20 Wiping after durability test Performance 7 32 According to remarks 1 to 3 of JIS D-5710 4.2, “M zone” is defined as one of the area formed by the reciprocation of the wiper blade from the center point of the blade to both ends.
The wiping area "S zone" of the / 4 portion is a wiping area other than the M zone "hairline" is a very fine streak wipe having a width of 0.5 mm or less.
What is the "wide line" that leaves a thin strip of less than
It refers to a band-shaped wiping residue having a width of about 1 to 20 mm. It also includes a collection of several hairlines and heavy lines, and a thin film-like wiping residue. , Respectively.
The term “after the endurance test” in the “wiping performance after the endurance test” indicates a time of 500,000 reciprocating operations (sliding).

As a method for testing a water repellent, JIS D
A water repellent was applied to the glass of the apparatus shown in FIG. 3 at 7.2 of -5710, dried, and wiped off with a towel moistened with water to obtain a water-repellent glass (water-repellent coated glass).

The evaluation items are as follows: wiper blade sliding area M zone and S zone, initial wiper blade sliding, 100,000, 200,000, 300,000, and 40,000 times after sliding.
Water repellency was observed after 500,000 times.

On the water-repellent glass, circles indicate polka dots, circles indicate distorted polka dots, and non-polka dots indicate crosses.

For comparison with a conventional blade, a test was also performed on an NR wiper blade (genuine Toyota product).

In the evaluation of the wiping performance based on JIS D-5710, the number X of the M zone and the number Y of the S zone were arranged side by side and expressed as XY. For example, if the number X of M zones is 0
In this case, when the number Y of S zones is 0, it is represented as “00”, when the number X of M zones is 0 and the number Y of S zones is 1, it is represented as “01”.

The wiper slides smoothly as a whole,
A glass having a clean water repellency and sufficient safety was indicated by ◎, and a glass having no water repellency was indicated by ×.

[Measurement results]

[Table 1-1]

[0120]

[Table 1-2]

[0121]

[Table 1-3]

[0122]

[Table 2-1]

[0123]

[Table 2-2]

[0124]

[Table 2-3]

[0125]

[Table 3-1]

[0126]

[Table 3-2]

[0127]

[Table 3-3]

[0128]

[Table 4-1]

[0129]

[Table 4-2]

[0130]

[Table 4-3]

[0131]

[Table 5-1]

[0132]

[Table 5-2]

[0133]

[Table 5-3]

[0134]

[Table 6-1]

[0135]

[Table 6-2]

[0136]

[Table 6-3]

[0137]

[Table 7-1]

[0138]

[Table 7-2]

[0139]

[Table 7-3]

[0140]

[Table 8-1]

[0141]

[Table 8-2]

[0142]

[Table 8-3]

[0143]

[Table 9-1]

[0144]

[Table 9-2]

[0145]

[Table 9-3]

[0146]

[Table 10-1]

[0147]

[Table 10-2]

[0148]

[Table 10-3]

[0149]

[Table 11-1]

[0150]

[Table 11-2]

[0151]

[Table 11-3]

[0152]

[Table 12-1]

[0153]

[Table 12-2]

[0154]

[Table 12-3]

[0155]

[Table 13-1]

[0156]

[Table 13-2]

[0157]

[Table 13-3]

[0158]

[Table 14-1]

[0159]

[Table 14-2]

[0160]

[Table 14-3]

[0161]

[Table 15-1]

[0162]

[Table 15-2]

[0163]

[Table 15-3]

[0164]

[Table 16-1]

[0165]

[Table 16-2]

[0166]

[Table 16-3]

[0167]

[Table 17-1]

[0168]

[Table 17-2]

[0169]

[Table 17-3]

[0170]

[Table 18-1]

[0171]

[Table 18-2]

[0172]

[Table 18-3]

[0173]

According to the vehicle wiper blade and the method for wiping water from a vehicle window glass according to the present invention, the frictional resistance of the blade against the water-repellent glass is reduced as compared with a natural rubber wiper (NR wiper), and the sliding property is improved. And the service life of the water repellent applied to the glass is improved. for that reason,
When water-repellent glass is used for the vehicle window glass, it is necessary to operate the wiper to secure a safe view. It is possible to secure the driver's view sufficiently by wiping with a wiper without causing the phenomenon of "" and "chatter", thereby providing safety and comfort.

Claims (7)

[Claims] 1. A vehicle wiper blade used in combination with a vehicle window glass surface-treated with a water repellent, wherein a lip portion sliding on the vehicle window glass has improved slidability. A wiper blade for a vehicle, characterized in that the wiper blade has a coating for the vehicle. 2. A vehicle wiper blade used in combination with a vehicle window glass surface-treated using a silicone-based or fluorine-based water repellent, comprising a natural rubber, a synthetic rubber or a rubber blended with them. And a lip portion sliding with the vehicle window glass is coated with a coating composition, and the coating composition is formed of silicone rubber, molybdenum disulfide, graphite, boron nitride. Containing a powder component selected from nylon, a water-absorbent resin, and a polytetrafluoroethylene resin, and a binder component selected from a urethane resin, an acrylic resin, and a fluoroolefin-alkyl vinyl ether copolymer. Wiper blade for vehicles. 3. The wiper blade for a vehicle according to claim 1, wherein the base of the water repellent is selected from the group consisting of amino-modified polysiloxane, dimethylpolysiloxane, and fluoroalkylsilane. 4. The binder component of the coating composition contains a urethane resin, and the urethane resin comprises an oil-modified polyurethane resin, a moisture-curable urethane resin, a two-pack urethane resin, and a block urethane resin. The vehicle wiper blade according to claim 2 or 3, wherein the wiper blade is selected from a group. 5. The coating composition according to claim 2, wherein the powder component is selected from the group consisting of silicone rubber, molybdenum disulfide, graphite, boron nitride, nylon, water-absorbing resin, and polytetrafluoroethylene resin. A vehicle wiper blade according to any one of claims 3 and 4. 6. A lip portion of a rubber blade coated with a coating for improving slidability on a surface of a vehicle window glass surface-treated with a water repellent when the vehicle travels in rainy weather. A method for wiping water from a vehicle window glass. 7. The water repellent is silicone-based or fluorine-based, the rubber blade is formed of a rubber material whose base material is natural rubber, synthetic rubber or a rubber blended with them, and the coating is Silicone rubber, molybdenum disulfide, graphite, boron nitride, nylon,
It is formed using a coating composition containing a water-absorbing resin, a powder component selected from polytetrafluoroethylene resin, and a binder component selected from urethane-based resin, acrylic resin, and fluoroolefin-alkylvinylether copolymer. A method for wiping water from a vehicle window glass according to claim 6.