JPH11315276A - Surface treating agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a surface treating agent which has excellent water drop slipping property and water repellency as well as a high hardness and can impart excellent stain resistance, solvent resistance and durability to a substrate surface, by making the agent contain, as indispensable components, a one- terminal functional polysiloxane and an alkoxy group containing organosilicon compd. respectively having a specific chemical structure. SOLUTION: Component A is represented by formula I (wherein R<1> -R<3> are each a 1-20C alkyl, cycloalkyl, or aryl; X is carboxyl group, hydroxylgroup, an epoxy group, amino group or the like; n is 0 or 1; m and p are each 0-10; and I is 0-1,000). An example is Silaplane (R) FM-0611 (commercial product). Component B is represented by formula II (wherein R<4> is 1-20C alkyl, cycloalkyl or aryl, either unsubstd. or replaced with a halogen, epoxy or the like; q is 0-5; r is 0 or 1; and s is 0-20). An example is ρ-chloropropyltrimethoxysilane. The blending ratio is 1-5,000 pts.wt. of the component B based on 100 pts.wt. of the component A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface of an inorganic substrate such as a metal or glass, a surface of an organic substrate such as an epoxy or urethane,
Nylon, polycarbonate and other plastics base material surface with excellent water-drop sliding property and water repellency, and with high hardness,
The present invention relates to a surface treatment agent capable of imparting excellent stain resistance, solvent resistance, and durability.

[0002]

2. Description of the Related Art Organic materials such as glass, metal, ceramics, and plastics as inorganic materials are used in a wide range of fields.
It is an indispensable material. Naturally, these materials have various properties, but various studies have been made to further modify and improve the properties of the materials. One method is surface modification and improvement. By surface modification of material, surface hardness is increased, weather resistance, antistatic, gloss, hydrophilicity, water repellency, oil repellency, water resistance, solvent resistance,
Various studies have been made to impart antifouling properties, slip properties, and the like.

Among them, various surface treatment agents have been developed and studied for the purpose of imparting water repellency to the surface of a substrate, for example, for imparting antifouling properties, hardly attaching ice and snow, and improving the visibility of glass and the like. Have been.

[0004] However, surface treatment agents that impart water repellency to the substrate surface, which have been studied and developed in the past, imparted excellent water repellency to the substrate surface, but did not always provide sufficient antifouling properties. This is a lens-shaped polka dot when water adheres to the substrate surface that has been water-repellent with a conventional surface treatment agent,
This is because water droplets are inferior in slipperiness, leaving polka dots on the surface as they are, absorbing dust and dust in the air, and causing contamination of the substrate surface.

To solve this problem, Japanese Patent Laid-Open Publication No.
No. 209118 discloses a water repellent effect and a dropping property of water droplets (inclined) in which a co-hydrolysate of a perfluoroalkyl group-containing organosilicon compound and a hydrolyzable group-containing methylpolysiloxane compound, an organopolysiloxane and an acid are blended. The water repellent treatment agent is described as having an excellent effect of improving the performance of the treatment agent that makes it easy for water droplets attached to the treated surface to fall on the treated surface to be expressed by an inclination angle, which is the same as the water droplet slip property.

[0006] However, although the water repellent treatment agent has improved the dropping property of water drops to some extent, it still has the properties of dropping water drops and maintaining its performance (including stain resistance, solvent resistance, and durability). (Hereinafter referred to as maintainability) is insufficient.

JP-A-9-268281 discloses an organosilane and a diorganopolysiloxane capped at both ends with silanol groups having a viscosity of 0.65 to 500 centistokes and having a water-soluble acid dissociation constant of 5.0. The following is a description of a water repellent composition for a vehicle glass, which does not contain an acid.

[0008] However, the above water repellent composition has a relatively good ability to drop water droplets, but is unsatisfactory in maintaining dropping water droplets. Therefore, development of a processing agent having higher performance is desired.

[0009]

Under the circumstances described above, the problem to be solved by the present invention is to have excellent water drop sliding properties and water repellency, high hardness, excellent stain resistance, and excellent stain resistance. An object of the present invention is to provide a surface treatment agent capable of imparting solvent properties and durability to the surface of a substrate.

[0010]

Means for Solving the Problems According to the present invention, as a result of intensive studies to achieve the above object, the following general formula (A)

Embedded image (Wherein, R ¹ , R ² and R ³ are each independently an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group or an aryl group, and X is a carboxyl group, a hydroxyl group, an epoxy group, an isocyanate group, a mercapto group, Group, halogen atom,
A hydroxyphenyl group or an amino group, m and p
Is an integer of 0 to 10, n is an integer of 0 or 1, and 1 is an integer of 0 to 1000. )) And 100 parts by weight of the one-terminal-functional polysiloxane represented by the following general formula (B):

Embedded image (Wherein, R ⁴ represents 1-20 carbon atoms which may be unsubstituted or substituted by one or more halogen, epoxy group, isocyanate group, mercapto group, amino group, acryloxy group, methacryloxy group, vinyl group. Is an alkyl group, a cycloalkyl group or an aryl group of
An integer of 5, r is 0 or 1, and s is an integer of 0 to 20. The organosilicon compound 1 containing an alkoxy group represented by the formula 1)
By using a surface treatment agent comprising 5,000 to 500 parts by weight, it has excellent water drop sliding property and water repellency, and has high hardness and excellent stain resistance, solvent resistance, and durability. Has been found to be able to be granted.

Hereinafter, the surface treating agent of the present invention will be described in detail.

The one-terminal functional polysiloxane having a functional group at one terminal used in the present invention is represented by the general formula (A)

[0013]

Embedded image Wherein R ¹ , R ² and R ³ in the formula are each independently an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group or an aryl group, such as a methyl group, an ethyl group, a propyl group and a butyl group. , A pentyl group, a phenyl group and a cyclohexyl group, and a methyl group and a phenyl group are preferred. In the formula, X is a carboxyl group, a hydroxyl group, an epoxy group, an isocyanate group, a mercapto group, a halogen atom, a hydroxyphenyl group, or an amino group, and is preferably a carboxyl group, a hydroxyl group, an amino group, or an epoxy group. Further, in the formula, m and p are each an integer of 0 to 10, n is 0 or 1, preferably m is 3, p
Is an integer of 1 to 10.

As a commercially available product of such a one-terminal functional polysiloxane, one terminal carboxypolysiloxane, Silaprene FM-0611 (number average molecular weight 1000,
Chisso Corporation), Silaplane FM-0621
(Number-average molecular weight 5000, manufactured by Chisso Corporation), Silaplane FM-0625 (number-average molecular weight 10,000, manufactured by Chisso Corporation) and the like, and one-terminal hydroxypolysiloxane Silaplane FM-0411 (number-average molecular weight 1000). , Silaplane FM-0421 (number average molecular weight 5000, manufactured by Chisso Corporation), Silaplane FM-0425 (number average molecular weight 10,000, manufactured by Chisso Corporation), X-22-170
DX (number average molecular weight 5100, manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-176DX (number average molecular weight 2000,
Shin-Etsu Chemical Co., Ltd.), X-22-170A (number average molecular weight 1800, Shin-Etsu Chemical Co., Ltd.), X-2
2-170B (number average molecular weight 2300, manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-170D (number average molecular weight 470
0, manufactured by Shin-Etsu Chemical Co., Ltd.).
5 (number average molecular weight 500, manufactured by Chisso Corporation), Silaplane FM-0511 (number average molecular weight 1000, manufactured by Chisso Corporation), Silaplane FM-0513 (number average molecular weight 2000, manufactured by Chisso Corporation), Silaplane FM -0521 (number average molecular weight 5000, manufactured by Chisso Corporation), Silaplane FM-0525 (number average molecular weight 10,000, manufactured by Chisso Corporation), X-22-173
A (number average molecular weight 2000, manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-173B (number average molecular weight 2500, manufactured by Shin-Etsu Chemical Co., Ltd.), X-22-173D (number average molecular weight 5100, Shin-Etsu Chemical Co., Ltd.) X-22)
-173DX (number average molecular weight 4500, manufactured by Shin-Etsu Chemical Co., Ltd.) and the like.

These resins may be used alone or in combination of two or more.

Next, as specific examples of the alkoxy group-containing organosilicon compound, non-substituted types include methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, isobutyltrimethoxysilane, and isobutyltriethoxysilane. , N-
Hexyltrimethoxysilane, n-octyltriethoxysilane, n-decyltrimethoxysilane, n-hexadecyltrimethoxysilane, n-octadecyltrimethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane , N-
Propyltriethoxysilane, methyldimethoxysilane, methyldiethoxysilane, phenyltrimethoxysilane, diphenyldimethoxysilane, phenyltriethoxysilane, diphenyldiethoxysilane, cyclohexenylethyltrimethoxysilane, cyclohexylmethyldimethoxysilane, diphenyldimethoxysilane, etc. And halogen-substituted types such as γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldimethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane, 3,3,4,4,5,5 6,6
7,7,8,8,8-undecafluorooctyltrimethoxysilane, 3,3,4,4,5,5,6,6,7,
7,8,8,9,9,10,10,10-heptadecylfluorodecyltrimethoxysilane, 3,3,4,4
5,5,6,6,7,7,8,8,9,9,10,1
0,10-heptadecylfluorodecylmethyldimethoxysilane and the like. Epoxy-substituted types such as γ-glycidoxypropyltrimethoxysilane and β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, and the like.
-Isocyanatopropyltriethoxysilane, γ-isocyanatopropyltrimethoxysilane, etc., and as mercapto group-substituted types, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropylmethyldimethoxy Silane and the like, and the amino-substituted type is γ-
Aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- (β-aminoethyl) -γ
-Aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-phenylaminopropyltrimethoxysilane,
N-methyl-γ-aminopropyltrimethoxysilane,
γ-aminopropylmethyldiethoxysilane, γ-dibutylaminopropyltrimethoxysilane, γ-diallylaminopropyltrimethoxysilane, γ-4,5-dihydroimidazol-1-ylpropyltriethoxysilane and the like, and methacrylic acid The group substitution type is γ-
Methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, and the like,
Examples of the vinyl-substituted type include vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane and the like, and γ-ureidopropyltriethoxysilane and the like. Of the above-mentioned alkoxy group-containing organosilicon compounds, those having a halogen or amino group are particularly preferred.

These compounds may be used alone or in combination of two or more. Moreover, you may use these hydrolysates.

The surface treating agent of the present invention contains these components at a ratio of 1 to 5000 parts by weight of an alkoxy group-containing organosilicon compound with respect to 100 parts by weight of a one-terminal functional polysiloxane having a functional group at one terminal. Is preferred. If the amount of the alkoxy group-containing organosilicon compound is less than 1 part by weight, the maintainability of water drop slippage is poor, and if it is more than 5000 parts by weight, the initial water drop slippage is poor.

The surface treating agent of the present invention is usually applied by applying it to various substrates and treating it at room temperature or under heating, but the application method is not particularly limited to this method. When the treatment is performed at room temperature after being applied to various substrates, the catalyst may be used to such an extent that the stability of the surface treating agent is not impaired. Examples of the catalyst include organic acids, inorganic acids, alkaline earth metals, titanium chelates, zirconium chelates, aluminum chelates, organotin compounds, and amines.

The surface treating agent of the present invention may be used as it is by mixing the above components, but may be used after being diluted with various organic solvents as needed. Examples of the organic solvent include alcohols such as methanol, ethanol, and butanol. Examples of the aromatic solvents include toluene, benzene, and xylene. Examples of the esters include ethyl acetate and butyl acetate. Among these organic solvents, it is preferable to use alcohols that contribute to the stability of the surface treatment agent of the present invention.

The surface treating agent of the present invention may further contain various additives as required, for example, a surfactant, a bulking agent,
Color pigments, extenders, rust preventive pigments, silicone powders, fluororesin powders, rust preventives, waxes and the like may be added.

[0022]

EFFECTS OF THE INVENTION The surface treating agent of the present invention has excellent water-drop sliding properties and water repellency, and is characterized by having high hardness and excellent stain resistance, solvent resistance and durability. It can be applied to surface treatment of a substrate. Specifically, automobiles, railway cars, other vehicles, window glasses and outer panels of buildings, etc., and toilets, washbasins, bathtubs, plumbing equipment such as kitchen sinks, and houses, exterior walls of buildings, etc., and air conditioners, It is applied to heat exchangers such as refrigerators, road signs, curve mirrors, etc., and is effective in improving antifouling properties, visibility, and hardly ice and snow.

[0023]

EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to the materials and quantitative ranges shown here.

The materials used in the following Examples and Comparative Examples are shown below. (1) Polysiloxane component Polysiloxane having an epoxy group at one end Sylaprene FM-0505 (number average molecular weight 500,
Thyraplane FM-0511 (number average molecular weight 100)
0, manufactured by Chisso Corporation) Thyraplane FM-0521 (number average molecular weight 500
0, manufactured by Chisso Corporation) Polysiloxane KF-105 having epoxy groups at both ends (number average molecular weight 1000, manufactured by Shin-Etsu Chemical Co., Ltd.) Polysiloxane KF-101 having epoxy groups on side chains (functional group equivalent 350, Shin-Etsu Chemical Co., Ltd.) Polysiloxane having an alcoholic hydroxyl group at one end X-22-170DX (number-average molecular weight 5000, manufactured by Shin-Etsu Chemical Co., Ltd.) Polysiloxane having an alcoholic hydroxyl group at both ends SF8427 (number-average molecular weight) 2400, manufactured by Toray Dow Corning Co., Ltd.) Polysiloxane SH28PA having an alcoholic hydroxyl group in the side chain (functional group equivalent: 500, manufactured by Toray Dow Corning Co., Ltd.) (2) Organosilicon compound containing alkoxy group γ-phenylaminopropyltrimethoxysilane SZ6083 (Toray Dow Γ-aminopropyltrimethoxysilane A-1110 (manufactured by Nippon Unicar Co., Ltd.) γ-aminopropyltriethoxysilane A-1100 (manufactured by Nippon Unicar Co., Ltd.) γ-chloropropyltrimethoxysilane SAILAACE S620 (Chisso) (Made by Toshiba Silicone Co., Ltd.)

Test methods in the following Examples and Comparative Examples are shown below. Pencil hardness was measured according to JIS K5400 (1990). Initial Water Drop Slip Angle A 20 μl deionized water drop was placed on a surface-treated glass plate kept horizontal, and gradually tilted by jacking up. The angle at which the water drop began to slide was measured in units of 10 degrees. 7 days after immersion in water The glass plate with a water drop sliding angle was immersed in deionized water for 7 days so that the entire surface was immersed. After the water on the glass plate was wiped off with a cloth, the angle at which the water droplet began to slide was measured in the same manner as above. Slipping angle of water droplet 7 days after immersion in toluene The angle at which the water droplet began to slide was measured in the same manner as above except that deionized water was changed to toluene. Slipping angle of water droplet 7 days after immersion in surfactant In the above, deionized water was added to 5% by weight of Ripon LS-2.
The angle at which the water droplet began to slide was measured in the same manner except that the aqueous solution was changed to a 50 (manufactured by Lion Corporation) aqueous solution.

[Example 1] In a 100 ml sample bottle,
FM-0505 10.0 g, SZ6083 10.0
g and 20.0 g of isobutyl alcohol were stirred and mixed at room temperature to obtain a surface treating agent solution. One drop of this solution was previously degreased with a mixed solvent of toluene / isopropyl alcohol = 2/1, placed on a dried slide glass (S-1214 manufactured by Matsunami Glass Industry Co., Ltd.), and spread with Kimwipe (Crecia Co., Ltd.). Was. After heat-treating this glass plate at 200 ° C. for 30 minutes, an excess surface treatment agent was wiped off with a cloth to obtain a surface-treated glass plate. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results.
Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

Example 2 In a 200 ml sample bottle,
FM-0505 10.0 g, SZ6083 50.0
g, 60.0 g of isobutyl alcohol, and stirred and mixed to obtain a surface treatment agent solution. A surface-treated glass plate was obtained in the same manner as in Example 1. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Embodiment 3] FM-05 in Embodiment 2
A surface-treated glass plate was obtained in the same manner except that 10.0 g of FM-0511 was used instead of 05. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results
Shown in Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Embodiment 4] FM-05 in Embodiment 2
A surface-treated glass plate was obtained in the same manner except that 10.0 g of FM-0521 was used instead of 05. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results
Shown in Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Embodiment 5] In Embodiment 2, FM-05 is used.
A surface-treated glass plate was obtained in the same manner except that 10.0 g of X-22-170-DX was used instead of 05. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Sixth Embodiment] In the second embodiment, SZ608 is used.
A surface-treated glass plate was obtained in the same manner except that 50.0 g of A-1100 was used instead of 3. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Embodiment 7] In the embodiment 2, SZ608 is used.
A surface-treated glass plate was obtained in the same manner except that 50.0 g of A-1110 was used instead of 3. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

[Embodiment 8] In Embodiment 2, SZ608 is used.
A surface-treated glass plate was obtained in the same manner except that 50.0 g of Silaace S620 was used instead of 3. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

Embodiment 9 SZ608 in Embodiment 2
A surface-treated glass plate was obtained in the same manner except that 50.0 g of TSL8113 was used instead of 3. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Even at the initial stage, even after immersion in various chemical solutions, good water droplet sliding properties were exhibited.

Comparative Example 1 In a 200 ml sample bottle,
KF-105 10.0 g, SZ6083 50.0
g and isobutyl alcohol (60.0 g) were added and stirred and mixed at room temperature to obtain a surface treating agent solution. A surface-treated glass plate was obtained in the same manner as in Example 1. This surface-treated glass plate
The test pieces were prepared and tested as described above. Table 1 shows the results. Initially, after immersion in water, the water droplet became spherical, but as the glass plate was tilted, the water droplet was deformed and slipped while leaving a small water droplet on the glass plate. Further, after immersion in toluene and a surfactant, water droplets did not slide down even if the glass plate was tilted vertically.

[Comparative Example 2] KF-10 in Comparative Example 1
A surface-treated glass plate was obtained in the same manner except that 10.0 g of KF-101 was used instead of 5. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Initially, the water droplets became spherical, but as the glass plate was tilted, the water droplets deformed and slipped leaving small water droplets on the glass plate. After immersion in water, toluene, and a surfactant, the water droplet did not slide down even if the glass plate was tilted vertically.

Comparative Example 3 KF-10 in Comparative Example 1
A surface-treated glass plate was obtained in the same manner except that 10.0 g of SF8427 was used instead of 5. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Initially, after immersion in water, the water droplet became spherical, but as the glass plate was tilted, the water droplet was deformed and slipped while leaving a small water droplet on the glass plate. Further, after immersion in toluene and a surfactant, water droplets did not slide down even if the glass plate was tilted vertically.

[Comparative Example 4] KF-10 in Comparative Example 1
A surface-treated glass plate was obtained in the same manner except that 10.0 g of SH28PA was used instead of 5. Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Initially, after immersion in water, the water droplet became spherical, but as the glass plate was tilted, the water droplet was deformed and slipped while leaving a small water droplet on the glass plate. Further, after immersion in toluene and a surfactant, water droplets did not slide down even if the glass plate was tilted vertically.

[Comparative Example 5] In a 100 ml sample bottle,
FM-0505 10.0 g, isobutyl alcohol 1
0.0 g was added thereto and stirred and mixed at room temperature to obtain a surface treating agent solution. A surface-treated glass plate was obtained in the same manner as in Example 1.
Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. Initially, the water droplet slipperiness after immersion in water was good, but the waterdrop slipperiness after toluene and surfactant immersion was remarkably deteriorated.

[Comparative Example 6] In a 100 ml sample bottle,
SZ6083 10.0 g, isobutyl alcohol 1
0.0 g was added thereto and stirred and mixed at room temperature to obtain a surface treating agent solution. A surface-treated glass plate was obtained in the same manner as in Example 1.
Four such surface-treated glass plates were prepared and subjected to the above test. Table 1 shows the results. The water droplets on the surface-treated glass plate did not slide down even when the glass plate was set upright from the initial stage.

Comparative Example 7 A 20 μl water drop was placed on a glass plate on which no treatment was performed, and the slip angle of the water drop was examined. However, the water drop was not spherical but spread, and the measurement was not possible.

[0042]

[Table 1]

From the above, it is apparent that the surface treating agent of the present invention imparts excellent water repellency and water droplet sliding property to the surface of the object to be treated, and has high durability.

Claims (2)

[Claims] (1) The following general formula (A): (Wherein, R ¹ , R ² , and R ³ are each independently an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group or an aryl group, and X is a carboxyl group, a hydroxyl group, an epoxy group, an isocyanate group, A mercapto group, a halogen atom, a hydroxyphenyl group, or an amino group, n is an integer of 0 or 1, m and p are each an integer of 0 to 10, and 1 is an integer of 0 to 1000.) And a one-terminal-functional polysiloxane represented by the following general formula (B): (Wherein R ⁴ is 1 to ⁴ carbon atoms which may be unsubstituted or substituted by one or more halogen, epoxy group, isocyanate group, mercapto group, amino group, acryloxy group, methacryloxy group, vinyl group) 20 is an alkyl group, a cycloalkyl group or an aryl group, q is an integer of 0 to 5, r is an integer of 0 or 1, s
Is an integer of 0 to 20. A surface treating agent containing the alkoxy group-containing organosilicon compound represented by the formula (1) as an essential component. 2. The surface-treating agent according to claim 1, wherein the content is 1 to 5000 parts by weight of the alkoxy group-containing organosilicon compound per 100 parts by weight of the one-terminal functional polysiloxane having a functional group at one end. .