JP2003330296A - Liquid addition-curable silicone rubber composition for toner fixing belt - Google Patents

Abstract

(57) [Problem] To be applied to the surface of a metal or resin belt material of a toner fixing belt of a copying machine, a laser beam printer, a facsimile or the like, and then cured by heating to form a silicone rubber layer. The present invention provides a silicone rubber composition which is capable of obtaining a fixing belt which does not cause peeling at an adhesive interface even when used for a long time due to strong adhesion, a fixing belt using the same, and a method for producing the same. thing. SOLUTION: (a) an alkenyl group-containing organopolysiloxane (b) an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom in one molecule, (c) a platinum-based catalyst, (d) an inorganic filler, And (e) a liquid addition-curable silicone rubber composition for a fixing belt containing an adhesiveness-imparting component.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a liquid addition-curable silicone rubber composition for a toner fixing belt, which is applied on the surface of a belt-shaped substrate made of heat-resistant resin or metal,
A liquid addition curing type used to form a toner fixing belt for copiers, laser beam printers, fax machines, etc. by further laminating a surface layer (outermost layer) made of a fluorine-based coating agent or a fluorine resin on it. TECHNICAL FIELD The present invention relates to a silicone rubber composition, a toner fixing belt using the same, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, as a toner fixing part used in a copying machine, a laser beam printer, a fax machine, etc., it is superior to other rubber materials in releasability from toner, heat resistance and compression set. Therefore, a silicone rubber roll is used. Recently, with the increase in speed of copying machines and the like, it is necessary to secure a sufficient time required for toner fixing, so that a toner fixing belt having a wide fixing width (nip width) is adopted instead of the fixing roll. Has become.
Further, along with the demand for reduction of power consumption, the practical use of the toner fixing belt is progressing.

As a toner fixing belt, a silicone rubber is laminated as a coating layer on the surface of a belt-shaped base material made of a heat-resistant resin or metal, and further on it in order to improve releasability from the toner. A flexible coating made of a fluorine coating agent or a fluororesin, which is laminated as a surface layer, has been put into practical use. However, there has been a problem that the adhesive interface between the belt-shaped substrate and the silicone rubber layer cannot withstand the stress generated by high temperature and deformation for a long period of time with the further increase in the speed of the device, and peeling occurs. As a countermeasure, it has been attempted to maintain adhesion durability by forming a silicone rubber layer after applying a primer on the surface of the belt-shaped substrate, but the material of the belt-shaped substrate and the silicone rubber is Since they were different, they were peeled off at the initial stage, and the durability could not be effectively improved.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to enable strong adhesion between a belt-shaped substrate and a silicone rubber layer, and to prevent peeling at the adhesive interface even after long-term use. To get a toner fixing belt that does not.

[0005]

[Means for Solving the Problems] That is, in order to solve the above-mentioned problems, the present invention has (a) an alkenyl group-containing organopolysiloxane (b) having two or more hydrogen atoms bonded to silicon atoms in one molecule. Liquid addition-curable silicone rubber composition for toner fixing belt containing organohydrogenpolysiloxane (c) platinum catalyst (d) inorganic filler, and (e) adhesion-imparting component, and toner fixing belt using the same And a method for manufacturing the same. The composition of the present invention is used for forming an intermediate elastic layer between a belt-shaped substrate of a toner fixing belt and a surface layer made of a fluorine coating agent or a fluororesin.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

[Component (a)] The alkenyl group-containing organopolysiloxane of component (a) is used as a base polymer of the addition-curable silicone rubber composition of the present invention and has an average compositional formula: R _a SiO _{( 4-a) / 2} (wherein R is
It represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms bonded to a silicon atom, and a is a positive number in the range of 1.9 to 2.4, preferably 1.95 to 2.05. ),
100-1,000,000 mPa ・ s at room temperature (25 ℃), preferably 500
It has a viscosity of up to 100,000 mPa · s.

Examples of R include an alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a hexyl group and a cyclohexyl group; a vinyl group, a propenyl group and an isoalkyl group. Alkenyl groups such as propenyl group, butenyl group; phenyl group,
An aryl group such as a tolyl group and a xylyl group; and a group in which the hydrogen atom of the above alkyl group or aryl group such as a 3,3,3-trifluoropropyl group is substituted with a halogen atom, a cyano group or the like. Of these, the alkenyl group is preferably a vinyl group, and the other substituents are preferably a methyl group or a phenyl group.

Each R in the organopolysiloxane represented by the above average composition formula may be the same or different, but it is necessary that at least one alkenyl group is contained in one molecule, It is preferable to contain two or more, especially three or more alkenyl groups, and 0.001 to 10 mol% of all R groups in the above average composition formula, especially
It is preferable that 0.01 to 5 mol% is an alkenyl group.
This organopolysiloxane has a trifunctional structural unit: (RSi
O _3/2 ) or a tetrafunctional structural unit: (SiO _4/2 ) may be branched, but usually the main chain basically consists of repeating diorganosiloxane units, It is preferably a linear diorganopolysiloxane having both ends blocked with triorganosiloxy groups.

This organopolysiloxane can be obtained by a known method in which an organocyclopolysiloxane and a hexaorganodisiloxane are subjected to an equilibration reaction in the presence of an alkali catalyst or an acid catalyst. Examples of the component (a) include the following.

[0011]

[Chemical 1] (In the formula, n is an integer of 0 or 1 or more so as to satisfy the above-mentioned viscosity range, and R is a group other than the alkenyl group as described above (hereinafter the same)).

[0012]

[Chemical 2] (In the formula, n is an integer of 0 or 1 or more, m is an integer of 1 or more, and n + m is a number that satisfies the above viscosity range)

[0013]

[Chemical 3] (In the formula, n is an integer of 0 or 1 or more, m is an integer of 1 or more, and n + m is a number that satisfies the above viscosity range)

[0014]

[Chemical 4] (In the formula, n is 0 or an integer of 1 or more, m is an integer of 1 or more, and n + m is a number that satisfies the above viscosity range.) These may be used alone or in combination of two or more. it can.

[Component (b)] The organohydrogenpolysiloxane of component (b) reacts with component (a) and acts as a crosslinking agent, and its molecular structure is not particularly limited and is conventionally produced. For example, various ones such as linear, cyclic, branched, three-dimensional network structure (resinous) can be used, but hydrogen bonded to two or more, preferably three or more silicon atoms in one molecule. It is necessary to have atoms (hydrosilyl group represented by SiH), and it is usually desirable to have 3 to 500, preferably 3 to 200, and more preferably 3 to 100 SiH groups. As the organohydrogenpolysiloxane, the one represented by the following average composition formula (I) is used.

R ¹ _b H _c SiO _{(4-ab) / 2} (I) In the above formula (I), R ¹ is a silicon atom excluding an aliphatic unsaturated bond, preferably having 1 to 10 carbon atoms. The unsubstituted or substituted monovalent hydrocarbon group bonded together, and examples of the unsubstituted or substituted monovalent hydrocarbon group for R ¹ include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and an isobutyl group. , Tert-butyl group, pentyl group,
Alkyl groups such as neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group, decyl group, aryl groups such as phenyl group, tolyl group, xylyl group, naphthyl group, benzyl group, phenylethyl group, phenylpropyl group, etc. Aralkyl groups and those in which some or all of the hydrogen atoms of these groups have been replaced with halogen atoms such as fluorine, bromine and chlorine, such as chloromethyl groups, chloropropyl groups,
Examples thereof include a bromoethyl group and a 3,3,3-trifluoropropyl group. The unsubstituted or substituted monovalent hydrocarbon group for R ¹ is preferably an alkyl group or an aryl group, more preferably a methyl group or a phenyl group. Also, b is
0.7 to 2.1, c is 0.001 to 1.0, and b + c is 0.8 to 3.0
Is a positive number, preferably b is 1.0 to 2.0,
c is 0.01 to 1.0 and b + c is 1.5 to 2.5.

The SiH group contained in two or more, preferably three or more in one molecule may be located at the terminal of the molecular chain, in the middle of the molecular chain, or at both of them. Good. The molecular structure of this organohydrogenpolysiloxane may be linear, cyclic, branched, or three-dimensional rope-like structure, but the physical properties of the resulting silicone rubber and the handling of the crude product From the viewpoint of the property, the number of silicon atoms (or the degree of polymerization) in one molecule is usually 2 to 1,00.
0, preferably 3 to 300, more preferably 4 to 150 are desirable, and the viscosity at 25 ° C. is usually 0.
A liquid at 1 to 5,000 mPa · s, preferably 0.5 to 1,000 mPa · s, more preferably about 5 to 500 mPa · s at room temperature (25 ° C.) is used.

The component (b) can be obtained by a known production method. Typical production methods include, for example, 1,3,5,7-tetramethyl-1,3,5,7-tetrahydrocyclotetrasiloxane (in some cases, the cyclotetrasiloxane and octamethylcyclotetrasiloxane And a siloxane compound serving as a terminal group source such as hexamethyldisiloxane and 1,3-dihydro-1,1,3,3-tetramethyldisiloxane, or octamethylcyclotetrasiloxane and 1 2,3-dihydro-1,1,3,3-tetramethyldisiloxane in the presence of a catalyst such as sulfuric acid, trifluoromethanesulfonic acid or methanesulfonic acid
It can be easily obtained by equilibrating at a temperature of about 10 to + 40 ° C.

Specific examples of the organohydrogenpolysiloxane of the formula (I) include 1,1,3,3-tetramethyldisiloxane, methylhydrogencyclopolysiloxane, methylhydrogensiloxane / dimethylsiloxane cyclic copolymers. Polymer, trimethylsiloxy group-blocked methylhydrogenpolysiloxane at both ends, trimethylsiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer at both ends, dimethylhydrogensiloxy group-blocked dimethylpolysiloxane at both ends, dimethylhydrogensiloxy at both ends Group-blocked dimethyl siloxane / methyl hydrogen siloxane copolymer, both ends trimethylsiloxy group-blocked methyl hydrogen siloxane / diphenyl siloxane copolymer, both ends trimethylsiloxy group-blocked Methylhydrogensiloxane-diphenylsiloxane-dimethylsiloxane copolymer,
Both ends dimethyl hydrogen siloxy group-blocked methyl hydrogen siloxane / dimethyl siloxane / diphenyl siloxane copolymer, (CH ₃ ) ₂ HSiO _1/2 units and (C
H _{3) 3} copolymers comprising SiO _1/2 units and SiO _4/2 units, copolymers comprising (CH _{3) 2} HSiO _1/2 units and SiO _4/2 units, (CH _{3) 2} Examples thereof include copolymers composed of HSiO _1/2 units, SiO _4/2 units, and (C ₆ H ₅ ) ₃ SiO _1/2 units. These can be used alone or in combination of two or more.

The amount of component (b) added is such that the number of hydrogen atoms (SiH groups) bonded to silicon atoms contained in the component is
Generally, 0.4 to 5.0, preferably 1 to 1 alkenyl group contained in the organopolysiloxane in the component (a),
The amount is 0.8 to 3.0. If the amount added is too small, the crosslink density becomes too low and the heat resistance of the cured silicone rubber is adversely affected. On the other hand, if the amount is too large, a problem of foaming due to the dehydrogenation reaction may occur, or the heat resistance may be adversely affected.

[Component (c)] The platinum-based catalyst of component (c) used in the present invention comprises an alkenyl group bonded to a silicon atom in component (a) and a SiH group in component (b). It is used for accelerating the hydrosilylation addition reaction, and those normally used for such addition reaction can be used without limitation, for example, platinum black, chloroplatinic acid, alcohol modified products of chloroplatinic acid, chloride Examples thereof include complexes of platinum acid with olefins, aldehyde compounds, vinyl siloxanes, acetylene alcohols and the like. (c)
The addition amount of the component may be an effective amount (so-called catalyst amount), and may be appropriately increased or decreased according to the desired curing rate. Normal,
The platinum metal content may be 0.1 to 1000 ppm, preferably 1 to 200 ppm, relative to the weight of the component (a).

[Component (d)] The inorganic filler as the component (d) used in the present invention imparts predetermined physical strength such as hardness and tensile strength to the composition. As the present filler, those normally used as a reinforcing filler in a silicone rubber composition can be used without limitation, and examples thereof include fumed silica, crystalline silica (quartz powder), precipitating silica, and hydrophobizing agent. Examples thereof include silica-based fillers such as treated silica, and these may be used alone or in combination of two or more. As an example of such a material, hydrophilic silica is Aerosil 130,200,300.
(Product name, Nippon Aerosil Co., Ltd., Degussa), Cabosil
MS-5, MS-7 (trade name, manufactured by Cabot), Rheorosil QS-102,10
3 (trade name, manufactured by Tokuyama Corp.), Nipsil LP (trade name, manufactured by Nippon Silica Co., Ltd.) and the like. Further, as the hydrophobic silica, Aerosil R-812, R-812S, R-972, R-974 (trade name, D
egussa), Rheorosil MT-10 (trade name, Tokuyama Soda Co., Ltd.)
, Nipsil SS series (trade name, manufactured by Nippon Silica Co., Ltd.), and crystalline silica includes crystallite (trade name, Tatsumori)
Minu-si1 (trade name, manufactured by US SILICA) and Imsil (trade name, manufactured by ILLINOIS MINERAL CO.).

In preparing the composition of the present invention, the hydrophilic silica may be hydrophobized at the same time by incorporating a hydrophobizing agent such as hexamethyldisilazane together with the hydrophilic silica. The amount of the filler as the component (d) is (a).
The amount is usually 5 to 300 parts by weight, preferably 20 to 200 parts by weight, based on 100 parts by weight of the component.

[(E) Adhesion-imparting component] Used in the present invention
The adhesion-imparting component of the component (e) is used to further increase the adhesive strength between the belt-shaped substrate and the silicone rubber layer, and is usually used in conventionally known liquid addition-curable silicone rubber compositions. Good. Examples of this adhesion-imparting component include aliphatic unsaturated functional groups such as vinyl group, allyl group, (meth) acryloxypropyl group, or glycidoxypropyl group, 3,4-epoxycyclohexylethyl group, etc. in the molecule. In addition to a trialkoxysilane having an epoxy functional group, it has at least one, preferably two or more silicon atom-bonded hydrogen atoms (that is, SiH groups) in one molecule, and at the same time, has a monovalent bond with a silicon atom. As the group, epoxy functional groups such as glycidoxypropyl group and 3,4-epoxycyclohexylethyl group; trimethylsilylethyl group,
Trialkoxysilyl functional groups such as triethylsilylethyl group; Trial-enoxysilyl functional groups such as tri (isopropenoxy) silylethyl group and tri (isopropenoxy) silylpropyl group; Ester functional groups such as acetoxypropyl group and acetoxyethyl group ;-( CH _{2) 3} -OCON
_{H- (CH 2) 3 -Si (} OCH 3) 3, - (CH 2) 2 -COO- (CH 2) 3 -Si (OC
_{H 3) 3, - (CH} 2) 3 -OCO- (CH 2) 3 -COO- (CH 2) 3 -Si (OCH 3)
A compound functional group having two or more structures such as an ester functional group such as ₃ ; a urethane functional group; a trialkoxysilyl functional group; and an acid anhydride functional group such as a carboxylic acid anhydride group. Having at least one functional group,
Examples thereof include functional group-containing organohydrogensiloxane oligomers. In this case, the number of silicon atoms constituting the siloxane structure in the siloxane oligomer is usually 2
.About.30, preferably about 3 to 20, is used, and the molecular structure of siloxane may be linear or cyclic, but tetracyclosiloxane (siloxane cyclic tetramer) is particularly preferably used.

As the adhesiveness-imparting component, the functional group-containing trialkoxysilane and the functional group-containing organohydrogensiloxane oligomer are usually used in a weight ratio of alkoxysilane: siloxane oligomer of 1:10.
~ 10: 1, preferably about 3: 7 to 7: 3,
It is preferable to combine them in the composition from the viewpoint of improving the adhesiveness.

Examples of such an organosilane or organosiloxane compound include the following compounds.

[0027]

[Chemical 5]

[0028]

[Chemical 6]

[0029]

[Chemical 7]

[0030]

[Chemical 8]

[0031]

[Chemical 9]

[0032]

[Chemical 10]

[0033]

[Chemical 11]

[0034]

[Chemical 12]

[0035]

[Chemical 13]

[0036]

[Chemical 14]

[0037]

[Chemical 15] These compounds may be used either individually or in combination of two or more.

The compounding amount of the component (e) is usually 0.5 to 50 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the component (a). If the blending amount of the component (e) is too small, it is not possible to achieve strong adhesion between the belt-shaped substrate and the silicone rubber layer, and conversely if it is too large, the physical properties of the rubber layer change in the durability test, There is a problem that the silicone rubber layer peels off from the belt-shaped substrate.

[Other compounding ingredients] In addition to the above-mentioned components (a) to (e), it is optional to add and compound other ingredients to the silicone rubber composition of the present invention.

When it is necessary to secure the pot life and adjust the curing time in order to put the present composition into practical use for molding or the like, a control agent such as vinylcyclotetrasiloxane can be used. Vinyl group-containing organopolysiloxanes, etc., triallyl isocyanurate, alkyl maleates, 1-ethynyl-1-cyclohexanol and other acetylene alcohols (and their silane and siloxane modifications), hydroperoxides and other organic peroxides And amines such as tetramethylenediamine and benzotriazole can be used. The control agents may be used alone or in combination of two or more.
Other non-reinforcing fillers such as diatomaceous earth and calcium carbonate;
Inorganic pigments such as cobalt blue, colorants such as organic dyes;
Addition of heat resistance or flame retardancy improvers such as cerium oxide, zinc carbonate, manganese carbonate, red iron oxide, titanium oxide, carbon black and the like is optional.

[Toner Fixing Belt] (1) As a belt-shaped substrate to which the silicone rubber composition of the present invention is applied, a material whose material is a heat resistant resin or a metal is used. For example, as a heat resistant resin,
Polyimide resin, polyamide resin, etc. are used. In the case of metal, aluminum, SUS (stainless steel), nickel electroformed products, etc. are used. In any case, it is formed into a thin film belt shape.

Further, as the fluorine-based coating agent containing the fluorine resin and / or the fluorine rubber used for forming the surface layer of the toner fixing belt, commercially available fluorine-based rubber latex or fluorine-based rubber solution is used. . Similarly, as the fluororesin for the surface layer, for example, poly (tetrafluoroethylene-perfluoroalkyl vinyl ether) (PFA) is used. The use of PFA is preferable because it makes it possible to adhere to the cured silicone rubber layer by heat fusion.

On the surface of the silicone rubber layer formed by curing the composition, for example, a fluororesin primer for silicone rubber: GLP-103 SR (trade name, manufactured by Daikin Industries, Ltd.) is used. Alternatively, the fluorine-based surface layer may be formed by adhesion after the primer treatment.

(2) The toner fixing belt is manufactured by the following steps. For example, a belt-shaped substrate made of heat-resistant resin or metal is fixed to a coating device, and the surface of the belt-shaped substrate is coated with an unvulcanized liquid silicone rubber composition,
It is cured by heating. A primer treatment is applied to the cured silicone rubber layer, and a fluorine-based coating agent is further applied onto the cured silicone rubber layer and cured by heating to obtain a toner fixing belt.

Further, the unvulcanized liquid silicone rubber composition is dissolved in a non-polar organic solvent such as low-viscosity dimethyl silicone oil or toluene or xylene, and applied on the surface of the belt-shaped substrate by air spraying to volatilize the solvent. By heating
You may harden and use it. A method of applying a heat-melted fluorine resin to the cured silicone rubber layer to form a toner fixing belt may be used.

[0046]

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

<Preparation Example 1> (Liquid Composition 1) 100 parts by weight of dimethylpolysiloxane (viscosity (25 ° C.): 10,000 mPa · s) with both ends blocked by dimethylvinylsilyl groups, fumed silica (specific surface area) : 300 cm ² / g) 40 parts by weight,
After charging 8 parts by weight of hexamethyldisilazane and 1 part by weight of water into a kneader and stirring and mixing at room temperature for 1 hour, 1
The temperature was raised to 50 ° C., and the mixture was kept at the temperature for 2 hours and mixed.

Thereafter, the mixture was cooled to room temperature, 20 parts by weight of the above dimethylpolysiloxane was further added, and 3 parts by weight of hydrogenmethylpolysiloxane represented by the following formula (viscosity (25 ° C.): 10 mPa · s) was added. Part (H / Vi (molar ratio of SiH group in component (b) to alkenyl group in component (a) (hereinafter the same)): 1.8 mol / mol), silicon in the main chain diorganosiloxane unit Vinyl group attached to an atom
[-Si (CH = CH ₂ ) (CH ₃ ) O-] 5 mol% and dimethylsiloxane unit 95 mol% dimethylsiloxane / methylvinylsiloxane copolymers capped at both ends with trimethylsiloxy groups (Viscosity (25 ° C): 700 mPa · s) 4 parts by weight, 1-ethynyl-1-cyclohexanol 0.1 part by weight, and platinum vinylsiloxane complex as platinum atom 50 pp
Liquid composition 1 was obtained by adding m and mixing well until uniform.

[0049]

[Chemical 16]

<Preparation Example 2> (Liquid composition 2) A vinyl group [-Si (CH = CH ₂ ) bonded to a silicon atom is contained in the main chain diorganosiloxane unit, both ends of which are blocked with trimethylsiloxy groups. (CH ₃ ) O-] 0.7 mol% and dimethylsiloxane unit 99.3 mol% dimethylsiloxane-methylvinylsiloxane copolymer (viscosity (25 ° C): 10,
000 mPa · s) 100 parts by weight, crystalline silica (average particle size: 5μ
m) 35 parts by weight, hydrogen methyl polysiloxane used in Preparation Example 1 above 3.1 parts by weight (H / Vi: 1.6 mol / mol), platinum catalyst (Pt concentration: 1% by weight) 0.2 parts by weight, and 1-ethynyl. -1-Cyclohexanol 0.1 part by weight was mixed to obtain Liquid Composition 2.

<Preparation Example 3> (Liquid Composition 3) 100 parts by weight of dimethylpolysiloxane (viscosity (25 ° C.): 10,000 mPa · s) having both ends blocked with dimethylvinylsilyl groups, crystalline silica (average particle size) Diameter: 5 μm) 35 parts by weight, hydrogenmethylpolysiloxane used in Preparation Example 1 above
3.1 parts by weight (H / Vi: 2.8 mol / mol), platinum catalyst (Pt
Concentration: 1% by weight) 0.2 parts by weight and 0.1 parts by weight of 1-ethynyl-1-cyclohexanol were mixed to obtain a liquid composition 3.

Example 1 To the liquid composition 1 obtained in Preparation Example 1, 1 part by weight of each of the adhesion-imparting components represented by the following formulas (1) and (2) was added. This mixture is 100 μm thick × 25 mm wide × 10 mm long.
It was applied on a 0 mm polyimide resin belt to a thickness of 100 μm, heat-cured at 150 ° C. for 30 minutes, and post-cured at 200 ° C. for 4 hours.

On the obtained silicone rubber coating layer, fluororubber latex (trade name: Daier latex GLS-
213 (manufactured by Daikin Industries, Ltd.) is applied to a thickness of 100 μm,
It was heat-cured at 300 ° C for 30 minutes to prepare an adhesion evaluation test piece. This adhesion evaluation test piece was left to stand in a dryer at 230 ° C for 1,
As a result of the adhesion evaluation after 000 hours, it was found that the polyimide resin belt and the silicone rubber were firmly bonded.

[0054]

[Chemical 17]

[0055]

[Chemical 18]

Example 2 To the liquid composition 2 obtained in Preparation Example 2, 1 part by weight of each of the adhesion-imparting components represented by the above formulas (1) and (2) was added. This mixture is 100 μm thick × 25 mm wide × 10 mm long.
Apply 100μm thickness on 0 mm SUS belt and 150 ℃
It was cured by heating for 30 minutes and post-cured at 200 ° C. for 4 hours. After that, an adhesion evaluation test piece was prepared and adhesion was evaluated in the same manner as in Example 1 above. As a result, the SUS belt and the silicone rubber were firmly bonded.

Example 3 In place of the liquid composition 2, the liquid composition 3 obtained in Preparation Example 3 was used to obtain a silicone rubber cured on a SUS belt in the same manner as in Example 2 above. PFA resin was melted at 320 ℃ on this cured silicone rubber, and the thickness was 100 μm.
Then, an adhesion evaluation test piece was prepared and adhesion was evaluated in the same manner as in Example 1 above. As a result, the SUS belt and the silicone rubber were firmly adhered.

Example 4 To the liquid composition 3 obtained in Preparation Example 3, 2 parts by weight of the adhesion-imparting components represented by the following formulas (3) and (4) were added. This mixture is 100 μm thick × 25 mm wide × 10 mm long.
It was applied on a 0 mm polyimide resin belt to a thickness of 100 μm, heat-cured at 150 ° C. for 30 minutes, and post-cured at 200 ° C. for 4 hours.

On the obtained silicone rubber coating layer, fluororubber latex (trade name: DAIEL LATEX GLS
-213 (manufactured by Daikin Industries, Ltd.) was applied to a thickness of 100 μm, heat-cured at 300 ° C. for 30 minutes to prepare an adhesion evaluation test piece, and adhesion was evaluated in the same manner as in Example 1. As a result, polyimide was obtained. The resin belt and the silicone rubber were firmly bonded.

[0060]

[Chemical 19]

[0061]

[Chemical 20]

Comparative Example 1 The liquid composition 1 obtained in Preparation Example 1 was coated with an addition reaction type liquid silicone rubber primer: X-33-174A / B (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.). Thickness 100 μm × width 25 mm ×
100 μm thick on 100 mm long polyimide resin belt
m, and thereafter, an adhesion evaluation test piece was prepared in the same manner as in Example 1. When this adhesion evaluation test piece was left to stand in a dryer at 230 ° C. and adhesion was evaluated after 24 hours, the silicone rubber layer was easily peeled off from the polyimide resin belt.

Comparative Example 2 The liquid composition 2 obtained in Preparation Example 2 was coated with an acrylic primer, and S having a thickness of 100 μm × a width of 25 mm × a length of 100 mm was used.
A 100 μm-thick coating was applied onto a US belt, and thereafter, an adhesion evaluation test piece was prepared in the same manner as in Example 1. When this adhesion evaluation test piece was left to stand in a dryer at 230 ° C. and adhesion was evaluated after 24 hours, the silicone rubber layer was easily peeled off from the SUS belt.

COMPARATIVE EXAMPLE 3 Liquid composition 3 obtained in Preparation Example 3 was coated with a titanium-based primer and had a thickness of 100 μm × width of 25 mm × length of 100 mm.
A 100 μm thick coating was applied onto the S belt, and thereafter, an adhesion evaluation test piece was prepared in the same manner as in Example 1. When this adhesion evaluation test piece was left to stand in a dryer at 230 ° C. and adhesion was evaluated after 168 hours, the silicone rubber layer was easily peeled off from the SUS belt.

[0065]

INDUSTRIAL APPLICABILITY The composition of the present invention is applied to the surface of a metal or resin belt-shaped substrate of a toner fixing belt, and is used for forming a silicone rubber layer by heating and curing. It enables strong adhesion that cannot be obtained by applying a primer to the substrate. Therefore, it is possible to obtain a toner fixing belt in which peeling does not occur at the adhesive interface even after long-term use. Therefore, the obtained toner fixing belt of the present invention can sufficiently withstand the harsh usage conditions associated with the speeding up of copying machines, laser beam printers, fax machines, etc., and can be used for a long time.

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Claims (3)

[Claims] 1. (a) alkenyl group-containing organopolysiloxane (b) organohydrogenpolysiloxane (c) platinum-based catalyst (d) inorganic filler having two or more hydrogen atoms bonded to silicon atoms in one molecule And (e) a liquid addition-curable silicone rubber composition for a toner fixing belt, which contains an adhesiveness-imparting component. 2. A silicone rubber coating layer obtained by curing the composition according to claim 1 on a belt-shaped substrate made of a heat resistant resin or a metal, and a fluorine resin on the silicone rubber coating layer. And / or a belt for fixing toner having a fluorine-based coating layer containing a fluorine-based rubber as a surface layer. 3. A silicone rubber coating layer is formed by applying the composition according to claim 1 on a belt-shaped substrate made of a heat resistant resin or a metal, and heating and curing the composition to form a silicone rubber coating layer. A method for producing a belt for fixing toner, comprising applying a coating agent and heating it to form a surface layer made of fluororesin and / or fluororubber.