JP2005300773A - Meandering prevention guide tape of endless belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a meandering prevention guide tape of an endless belt which eliminates the possibility that the endless belt causes a thermal deformation, can maintain the shape of the guide, reduces the possibility of the occurrence of a difference in level in the juncture of the meandering prevention guides and can suppress the image unevenness and image slippage by accompanying the misalignment in an exposure position and transfer position. <P>SOLUTION: The flexible endless belt 1 used for an electrophotographic copying etc., and the guide tapes 2 for meandering prevention which are disposed on both side parts on the inner peripheral surface of the endless belt 1 and extend in a circumferential direction are provided. The respective guide tapes 2 are formed of silicone adhesives which are molded to a prescribed shape before curing and adhere and integrate to the inner peripheral surface of the endless belt 1 after curing. The silicone adhesives are provided with polymerization layers 3. The polymerization layers 3 are composed of metallic foil, films or fiber fabrics. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an endless belt meandering prevention guide tape used in an intermediate transfer device such as an electrophotographic copying machine and a laser printer, a transfer separation device, a transport device, a charging device, a developing device and the like.

  Conventionally, endless belts are used for photosensitive devices such as electrophotographic copying machines, intermediate transfer devices, transfer separation devices, transport devices, charging devices, developing devices, and the like (see Patent Documents 1 and 2). This type of endless belt is formed using a thermoplastic resin or the like, and is supported by a plurality of rollers in contact with the inner peripheral surface thereof, and is used for transferring a toner image and conveying recording paper. At least one of the plurality of rollers is a driving roller connected to a driving source such as a motor, and the other is a driven roller that rotates as the endless belt circulates.

Incidentally, in order to drive the endless belt with high accuracy, it is necessary that the axes of the rollers are parallel to each other and that the rollers have high roundness and straightness. When these are not satisfied, the endless belt meanders, and the exposure position and the transfer position are shifted, causing image unevenness and image shift. In order to prevent the endless belt from meandering, a method has been proposed in which a flange is provided on the drive roll (see Patent Document 3), the amount of meandering is detected, and the parallelism of each roll is controlled.
JP 59-230950 A JP 62-50873 A JP 58-100145 A

  However, when the flange is provided, if the meandering is large, the endless belt may ride on the flange and break, and when controlling the parallelism of the roll, the structure is complicated and expensive, and the size is increased. There is a problem of end.

On the other hand, in order to improve the endless belt 1 and prevent meandering, a meandering prevention guide 4 in which a pressure-sensitive adhesive is provided on one of a hot melt adhesive and an elastic sheet-like plastic is provided via an adhesive layer 5. A technique for bonding has been proposed (see FIG. 3).
However, when the guide is formed with a hot melt adhesive, since the hot melt adhesive melted at 180 to 200 ° C. is directly applied to the endless belt 1, the endless belt 1 made of a thermoplastic resin such as polyethylene may be thermally deformed. There are many. Further, since the hot melt adhesive has a low viscosity, there is a problem that it is difficult to maintain the shape of the guide until it is cooled and solidified.

  Further, when the meandering prevention guide 4 provided with the pressure sensitive adhesive is bonded to one of the elastic sheet-like plastics, the tape-like meandering prevention guide 4 provided with the pressure sensitive adhesive is used in actual work. A connecting portion is generated when the endless belt 1 is stuck, but the connecting portion of the meandering prevention guide 4 often becomes a step. When such a stepped portion occurs, the endless belt 1 meanders, and the exposure position and the transfer position are shifted, resulting in image unevenness and image shift.

  The present invention has been made in view of the above, the endless belt is less likely to be thermally deformed, the shape of the guide can be maintained, there is less possibility of a step in the meandering prevention guide connecting portion, and the exposure position and It is an object of the present invention to provide an endless belt meandering prevention guide tape capable of suppressing and preventing image unevenness and image displacement due to a transfer position shift.

In the present invention, in order to solve the above problems, a guide tape for meandering prevention is provided in the circumferential direction on at least one side portion of the inner peripheral surface of the endless belt,
The guide tape is formed into a predetermined shape before curing, and after curing, it is a silicone adhesive that is bonded to and integrated with the inner peripheral surface of the endless belt.

In addition, it is preferable to set the plasticity before hardening of a silicone adhesive in the range of 30-500 when it measures with a Williams plasticity meter.
Moreover, a polymerization layer can be provided in a silicone adhesive, and this polymerization layer can be used as a metal foil, a film, and / or a fiber cloth.

  Here, the endless belt in the claims can be used for at least a photosensitive device such as an electrophotographic copying machine, an intermediate transfer device, a transfer separation device, a transport device, a charging device, and a developing device. The guide tape may be provided on one side of the inner peripheral surface of the endless belt, or may be provided on both sides of the inner peripheral surface of the endless belt. This guide tape is formed into a fixed shape such as a line, a band, or a string.

  The silicone adhesive may be any of a type that cures by hydrosilylation reaction, a type that cures by radical reaction, a type that cures by condensation reaction, a type that cures by ultraviolet reaction, or a type that cures by radiation reaction. The shape is a trapezoid or the like. The polymerized layer can be provided on the inside, the outside, or the surface of the silicone adhesive.

  According to the present invention, there is little possibility that the endless belt is thermally deformed, the shape of the guide can be maintained, and there is an effect that a possibility that a step is generated in the connecting portion of the meandering prevention guide can be eliminated. Further, it is possible to suppress image unevenness and image shift due to shift of the exposure position and transfer position.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. The endless belt meandering prevention guide tape in this embodiment is used in an electrophotographic copying machine or the like as shown in FIGS. A flexible endless belt 1 and guide tapes 2 for preventing meandering disposed on both sides of the inner peripheral surface of the endless belt 1 and extending in the circumferential direction. A silicone adhesive that is formed into a predetermined shape and is cured (seamless) after adhering to the inner peripheral surface of the endless belt 1, and a polymer layer 3 is laminated and coated on the surface of the silicone adhesive. The polymer layer 3 is a metal foil, a film, or a fiber cloth.

  The material of the endless belt 1 is not particularly limited. For example, the endless belt 1 is formed endlessly using a thermoplastic resin such as polyethylene, polycarbonate, polyethylene terephthalate, ethylene / tetrafluoroethylene copolymer, and a pair of unillustrated It is circulated between rollers so that it can circulate. The endless belt 1 is appropriately subjected to corona treatment and primer treatment in order to improve adhesion with a silicone adhesive.

  Each guide tape 2 is made of a band-shaped silicone adhesive having a rectangular cross-section from the viewpoint of preventing meandering, both ends are butted, and the plasticity before curing measured with a Williams plasticity meter is 30 to 500, preferably 100. It is set in the range of ~ 500. This is because, when the plasticity is less than 30, when the silicone adhesive is made into an uncured, fixed shape or shape retention after molding is lowered, it becomes difficult to maintain an arbitrary shape.

  Further, when the plasticity exceeds 500, it is extremely difficult to remove bubbles remaining at the interface when the silicone adhesive is bonded to the endless belt 1, and the bubbles are in contact with the silicone adhesive and the endless belt 1. This is because the area is reduced and the adhesive strength is reduced. The width of the guide tape 2 is not particularly limited and is appropriately selected from the viewpoints of preventing meandering and durability.

As for the silicone adhesive, a silicone rubber adhesive by any crosslinking method such as radical reaction, hydrosilylation reaction with a platinum catalyst, condensation reaction, ultraviolet ray, electron beam curing, etc. can be used. However, in practice, from the economical and physical viewpoints, a cured product by an addition reaction or a cured adhesion by a condensation reaction is preferable.
As the silicone adhesive, a condensation curable type, a hydrosilylation reaction curable type, and an organic oxide curable type, which will be described below, are selected.

I Condensation-curable silicone adhesive This condensation-curable silicone adhesive generally has the following basic composition.
(1) Polyorganosiloxane A main component of a condensation-curable silicone adhesive, which is a diorganopolysiloxane represented by the following general formula (1) or (2).

(In the formula, R is a substituted or unsubstituted monovalent hydrocarbon group, X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, and n is a viscosity of the diorganopolysiloxane at 25 ° C. of 100,000 mPa · s or more, preferably 1,000,000 mPa · s or more.)

（式中、Ｙは加水分解性基、ａは２又は３、Ｒ、Ｘ、ｎは上記と同様である。）

(In the formula, Y is a hydrolyzable group, a is 2 or 3, and R, X, and n are the same as above.)

  Here, R is an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a 2-ethylbutyl group or an octyl group, a cycloalkyl group such as a cyclohexyl group or a cyclopentyl group, a vinyl group, a propenyl group, a butenyl group, or a heptenyl. Group, hexenyl group, alkenyl group such as allyl group, phenyl group, tolyl group, xylyl group, naphthyl group, aryl group such as diphenyl group, aralkyl group such as benzyl group, phenylethyl group, or the carbon atom of these groups Identical or different non-selective groups selected from a chloromethyl group, a trifluoropropyl group, a 2-cyanoethyl group, a 3-cyanopropyl group, etc. in which some or all of the bonded hydrogen atoms are substituted with halogen atoms, cyano groups, etc. Substitution or substitution is preferably a monovalent hydrocarbon group having 1 to 12 carbon atoms, particularly 1 to 10 carbon atoms.

X is an oxygen atom or a divalent hydrocarbon group having 1 to 8 carbon atoms, the divalent hydrocarbon group _{- (CH 2) m - (} m is 1-8) is represented by. Among these, an oxygen atom and —CH ₂ CH ₂ — are preferable.

  n is a number that makes the viscosity of the diorganopolysiloxane at 25 ° C. 100,000 mPa · s or more, preferably 1,000,000 mPa · s or more. Y is a hydrolyzable group, specifically, an alkoxy group such as a methoxy group, an ethoxy group, a propoxy group or a butoxy group, a ketoxime group such as a dimethyl ketoxime group or a methylethyl ketoxime group, an acyloxy group such as an acetoxy group, Examples thereof include alkenyloxy groups such as isopropenyloxy group and isobutenyloxy group.

  Such a diorganopolysiloxane can be produced by a known method such as obtaining a cyclic siloxane or linear oligomer, which is a monomer of various organopolysiloxanes, by an equilibrium reaction with an acid or base catalyst.

When a branched structure is introduced into the diorganopolysiloxane, a silane or siloxane containing SiO _3/2 units and / or SiO _4/2 units is added at such a level that the diorganopolysiloxane does not gel during the equilibration polymerization. It is a common method. Furthermore, it is preferable that the low molecular weight siloxane is removed from the diorganopolysiloxane by stripping or washing. When such an organosiloxane is used, the initial contamination can be reduced.

(2) Crosslinking agent As the crosslinking agent, a silane having 2 or more, preferably 3 or more hydrolyzable groups in one molecule, or a partially hydrolyzed condensate thereof is used. In this case, the hydrolyzable group includes an alkoxy group such as a methoxy group, an ethoxy group, and a butoxy group, a ketoxime group such as a dimethyl ketoxime group and a methylethyl ketoxime group, an acyloxy group such as an acetoxy group, an isopropenyloxy group, Examples thereof include alkenyloxy groups such as isobutenyloxy group, amino groups such as N-butylamino group and N, N-diethylamino group, and amide groups such as N-methylacetamide group. Among these, an alkoxy group, a ketoxime group, an acyloxy group, and an alkenyloxy group are preferable.

  The amount of the crosslinking agent is 1 to 50 parts, preferably 2 to 30 parts, and more preferably 5 to 20 parts with respect to 100 parts (parts by mass) of the diorganopolysiloxane.

(3) Curing catalyst The composition of the silicone rubber adhesive according to the present invention is accelerated by the use of a curing catalyst. Examples of the curing catalyst include alkyltin ester compounds such as dibutyltin diacetate, dibutyltin dilaurate, and dibutyltin dioctoate, tetraisopropoxy titanium, tetra n-butoxy titanium, tetrakis (2-ethylhexoxy) titanium, dipropoxy bis (acetylacetate). Na) Titanic acid esters or titanium chelate compounds such as titanium and titanium isopropoxyoctylene glycol, zinc naphthenate, zinc stearate, zinc-2-ethyl octoate, iron-2-ethylhexoate, cobalt-2-ethyl Organometallic compounds such as hexoate, manganese-2-ethylhexoate, cobalt naphthenate, alkoxyaluminum compounds, 3-aminopropyltriethoxysilane, N-β (aminoethyl) γ-aminopropyltrimeth Aminoalkyl group-substituted alkoxysilanes such as xysilane, amine compounds such as hexylamine and dodecylamine phosphate and salts thereof, quaternary ammonium salts such as benzyltriethylammonium acetate, alkali metals such as potassium acetate, sodium acetate and lithium oxalate. Lower fatty acid salt, dialkylhydroxylamine such as dimethylhydroxylamine, diethylhydroxylamine, tetramethylguanidylpropyltrimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris (trimethylsiloxy) silane, etc. Examples thereof include silane or siloxane containing guanidyl group.

  These are not limited to one type and can be used as a mixture of two or more types. The blending amount of the curing catalyst is 0 to 20 parts, preferably 0.001 to 10 parts, and more preferably 0.01 to 5 parts with respect to 100 parts of the diorganopolysiloxane.

(4) Filler In addition to the above components, one or more fillers are appropriately added to the silicone rubber adhesive composition according to the present invention for the purpose of reinforcement. Examples of such fillers include fumed silica, precipitated silica, silica whose surface is hydrophobized with an organosilicon compound, quartz powder, carbon black, talc, zeolite, bentonite and other reinforcing agents, asbestos, Examples thereof include fiber fillers such as glass fiber, carbon fiber, and organic fiber, and basic fillers such as calcium carbonate, zinc carbonate, zinc oxide, magnesium oxide, and celite. Among these fillers, silica, calcium carbonate, zeolite and the like are preferable, and particularly, fumed silica and calcium carbonate whose surfaces have been subjected to a hydrophobic treatment are preferable.

  The blending amount of the filler may be selected according to the purpose and the kind of the filler, but is preferably 1 to 500 parts, particularly 5 to 100 parts, with respect to 100 parts of the diorganopolysiloxane (1) ′ component of the base polymer. .

(5) Adhesive imparting component As an adhesion promoter, amino group-containing organoalkoxysilanes such as γ-aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, and γ-glycidoxypropyltri Examples include epoxy group-containing organoalkoxysilanes such as methoxysilane, mercapto-containing organoalkoxysilanes such as γ-mercaptopropyltrimethoxysilane, and reaction mixtures of amino group-containing organoalkoxysilanes and epoxy group-containing organoalkoxysilanes. The compounding quantity of this component is 0.1-5 mass parts normally with respect to 100 mass parts of (1) 'component.

II Hydrosilylation Reaction-Curable Silicone Adhesive This hydrosilylation reaction-curable silicone adhesive generally has the following basic composition.
(1) ′ Polyorganosiloxane A main component of a hydrosilylation reaction-curable silicone adhesive composition, characterized by having an average of two or more alkenyl groups in one molecule. Examples of the alkenyl group include a vinyl group, an aryl group, a butenyl group, a pentenyl group, a hexenyl group, and a heptenyl group, and a vinyl group is most suitable.

  Examples of organic groups bonded to silicon atoms other than alkenyl groups in this component include methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups and other alkyl groups; phenyl groups, tolyl groups, xylyl groups, etc. Aryl group; halogenated alkyl groups such as 3-chloropropyl group, 3,3,3-trifluoropropyl group and the like are exemplified, and methyl group is most suitable. Examples of the molecular structure of this component include a straight chain, a partially branched straight chain, a branched chain, a net, and a dendritic. The viscosity of this component at 25 ° C. is 100,000 mPa · s or more, preferably 1,000,000 mPa · s or more.

As the polyorganosiloxane of this component, molecular chain both ends dimethylvinylsiloxy group-blocked polydimethylsiloxane, molecular chain both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer, molecular chain both ends trimethylsiloxy group-blocked dimethyl Siloxane / methylvinylsiloxane copolymer, siloxane unit represented by the formula: (CH ₃ ) ₃ SiO _1/2 and siloxane unit represented by the formula: (CH ₃ ) ₂ (CH ₂ ═CH) SiO _1/2 : _{Polyorganosiloxanes} composed of siloxane units represented by SiO _4/2 , some or all of the methyl groups of these polyorganosiloxanes are alkyl groups such as ethyl groups and propyl groups; aryl groups such as phenyl groups and tolyl groups; Polyorgano substituted with halogenated alkyl group such as 3,3,3-trifluoropropyl group Rokisan, aryl some or all of the vinyl groups of these polyorganosiloxanes, polyorganosiloxanes substituted with alkenyl groups such as propenyl group, and mixtures of two or more of these polyorganosiloxanes are exemplified.

(2) 'Hydrogenated polyorganosiloxane This polyorganosiloxane acts as a curing agent for the present composition and is characterized by having an average of two or more silicon-bonded hydrogen atoms in one molecule. Examples of the organic group bonded to the silicon atom in this component include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group; an aryl group such as a phenyl group, a tolyl group, and a xylyl group; -Halogenated alkyl groups such as chloropropyl group and 3,3,3-trifluoropropyl group are exemplified, and methyl group is preferable.

  Examples of the molecular structure of this component include linear, partially branched, branched, network, and dendritic. The viscosity of this component at 25 ° C. is not limited, but is preferably in the range of 1 to 1,000,000 mPa · s, particularly preferably in the range of 1 to 10,000 mPa · s.

The polyorganosiloxane of this component includes molecular chain both ends dimethylhydrogensiloxy-blocked polydimethylsiloxane, molecular chain both ends trimethylsiloxy group-blocked polymethylhydrogensiloxane, molecular chain both ends trimethylsiloxy-blocked dimethylsiloxane and methylhydrogen. Siloxane copolymer, cyclic polymethylhydrogensiloxane, polyorganosiloxane comprising a siloxane unit represented by the formula: (CH ₃ ) ₂ HSiO _1/2 and a siloxane unit represented by the formula: SiO _4/2 , and these polyorganos Polysiloxanes in which some or all of the methyl groups of siloxane are substituted with alkyl groups such as ethyl groups and propyl groups; aryl groups such as phenyl groups and tolyl groups; and halogenated alkyl groups such as 3,3,3-trifluoropropyl groups. Organosiloxane and this A mixture of two or more types of polyorganosiloxanes is exemplified, and the resulting cured product has improved mechanical properties, particularly elongation, so that polyorganosiloxane and molecules having silicon-bonded hydrogen atoms only at both ends of the molecular chain. A mixture of polyorganosiloxane having a silicon atom bond in the chain side chain is preferred.

  In this composition, the content of this component is such that the molar ratio of silicon atom-bonded hydrogen atoms in this component to alkenyl groups in (1) component is in the range of 0.01 to 20, preferably 0.0. The amount is in the range of 1 to 10, particularly preferably the amount in the range of 0.1 to 5. This is because when the content of this component is less than the lower limit of the above range, the resulting adhesive tends not to be sufficiently cured.

  Conversely, when the upper limit of the above range is exceeded, the mechanical properties of the resulting cured adhesive product tend to be reduced. When a mixture of a polyorganosiloxane having silicon atom-bonded hydrogen atoms only at both ends of the molecular chain and a polyorganosiloxane having silicon atom bonds in the molecular chain side chain is used as this component, The content is such that the molar ratio of silicon-bonded hydrogen atoms in this component to alkenyl groups in component (1) is in the range of 0.01 to 10, preferably in the range of 0.1 to 10. The amount, particularly the amount within the range of 0.1 to 5, is good.

  The content of the latter polyorganosiloxane is such that the molar ratio of silicon-bonded hydrogen atoms in this component to alkenyl groups in component (1) is in the range of 0.5 to 20, preferably 0.5. An amount that falls within the range of 10 is preferable, particularly an amount that falls within the range of 0.5 to 5.

(3) Curing catalyst The platinum catalyst for hydrosilylation reaction includes platinum fine powder, platinum black, chloroplatinic acid, alcohol-modified chloroplatinic acid, platinum-diketone complex, chloroplatinic acid-olefin complex, platinum chloride Examples include acids and alkenylsiloxane complexes, and those obtained by supporting them on a carrier such as alumina, silica, or carbon black. Among these, a complex of chloroplatinic acid and alkenylsiloxane is preferable because of its high catalytic activity as a hydrosilylation reaction catalyst, and in particular, the chloroplatinic acid and divinyltetramethyldisiloxane complex disclosed in JP-B-42-22924 is preferred. good.
The addition amount of this component is 1-1000 mass parts as a platinum metal atom with respect to 1 million mass parts of (1) component, Preferably it is 1-100 mass parts.

(4) ′ Filler The filler is added to improve the mechanical strength of the composition, and a compound for blending silicone rubber is usually used. Examples of this component include fumed silica, precipitated silica, calcined silica, pulverized quartz, and powder obtained by surface-treating these silica powders with an organosilicon compound such as organoalkoxysilane, organohalosilane, or organosilazane. In particular, in order to sufficiently improve the mechanical strength of the obtained adhesive cured product, it is preferable to use silica powder having a BET specific surface area of 50 m ² / g or more as this component.

  In this composition, the content of this component is arbitrary, but in order to improve the mechanical strength of the resulting silicone rubber cured product, (1) in the range of 1 to 1000 parts by mass with respect to 100 parts by mass of component. It is preferable that it is in the range of 1 to 400 parts by mass. Further, in the present composition, as other optional components, for example, fumed titanium oxide, carbon black, carbon nanotube, diatomaceous earth, iron oxide, aluminum oxide, aluminosilicate, calcium carbonate, zinc oxide, aluminum hydroxide, Inorganic fillers such as silver, gold and nickel, gold and silver plated inorganic and organic fillers; a filler obtained by treating the surface of these fillers with the above organosilicon compound may be contained.

(5) 'Adhesiveness imparting component In order to make this hydrosilylation reaction curable silicone adhesive function as an adhesive, the adhesiveness is imparted and improved. This includes methyltrimethoxysilane, vinyltrimethoxysilane, allyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N- (2 -Aminoethyl) -3-aminopropyltrimethoxysilane, bis (trimethoxysilyl) propane, silane coupling agents such as bis (trimethoxysilyl) hexane, and partial hydrolysates thereof; epoxy group, acid anhydride group, Organic compounds having an α-cyanoacryl group and siloxane compounds containing these groups, or organic compounds or siloxane compounds having both of these groups and alkoxysilyl groups; tetraethyl titanate, tetrapropyl titanate, tetrabutyl titanate, tetra (2- D (Ruhexyl) titanate, titanium ethyl acetonate, titanium acetyl acetonate, etc. titanium compounds; ethyl acetoacetate aluminum diisopropylate, aluminum tris (ethyl acetoacetate), alkyl acetoacetate aluminum diisopropylate, aluminum tris (acetylacetonate), Aluminum compounds such as aluminum monoacetylacetonate bis (ethyl acetoacetate); zirconium compounds such as zirconium acetylacetonate, zirconium butoxyacetylacetonate, zirconium bisacetylacetonate, and zirconium ethylacetoacetate may be contained.

  Although content of these adhesion imparting agents is not limited, Preferably it exists in the range of 0.01-10 mass parts with respect to 100 mass parts of (1) component.

  Furthermore, this composition contains 3-methyl-1-butyn-3-ol, 3,5-dimethyl-1-hexyn-3-ol, 3-phenyl-1-butyne-3 in order to adjust its curability. -Acetylene compounds such as ol; Enyne compounds such as 3-methyl-3-penten-1-yne, 3,5-dimethyl-3-hexen-1-in; 1,3,5,7-tetramethyl-1 , 3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, silanol group-blocked methylvinylsiloxane, molecular chain Silanol group-blocked methyl vinyl siloxane / dimethyl siloxane copolymer, etc., organosiloxane compounds having a vinyl group of 5% by weight or more in one molecule; triazoles such as benzotriazole, Osufin acids, mercaptans, preferably contains a curing inhibitor such as hydrazines. Although content of these hardening inhibitors is not limited, It is preferable to exist in the range of 0.001-5 mass parts with respect to 100 mass parts of (1) component.

  The present composition is not particularly limited, and can be prepared by mixing other optional components as necessary. However, the base compound is prepared by heating and mixing (1) component and (3) component in advance. It is preferred to prepare and add the remaining ingredients to the base compound. Moreover, when it is necessary to add other arbitrary components, it may be added when preparing the base compound, and when this is altered by heat mixing, the addition of the components (2) to (4) It is preferable to add at the time.

  Moreover, when preparing this base compound, the said organosilicon compound may be added and the surface of (3) component may be processed in-situ. For the preparation of the adhesive, a known kneading apparatus such as a two-roll, a kneader mixer, or a loss mixer can be used.

III Organized Oxide Curing Silicone Adhesive When the organopolysiloxane composition is a curable silicone rubber composition with an organic peroxide, the organopolysiloxane used as the base polymer is preferably gum-like. And those having a viscosity at 25 ° C. of 100,000 mPa · s or more, preferably 1,000,000 mPa · s or more and having at least two alkenyl groups such as vinyl groups in the molecular chain terminal and / or molecular chain.

  An organic peroxide is used as the curing catalyst. Examples of organic peroxides include alkyl-based organic peroxides such as dicumyl peroxide and di-t-butyl peroxide, acyl-based organic peroxides such as benzoyl peroxide and 2,4-dichlorobenzoyl peroxide. The product is used as a suitable compound. The blending amount is preferably 0.1 to 10 parts by mass, particularly preferably 0.2 to 5 parts by mass with respect to 100 parts by mass of the base polymer organopolysiloxane.

IV. Radiation curable silicone adhesive When the organopolysiloxane composition is a radiation curable silicone rubber composition, the organopolysiloxane used as the base polymer includes vinyl groups in the molecular chain terminals and / or molecular chains, Those having two or more aliphatic unsaturated groups such as aryl group, alkenyloxy group, acrylic group and methacryl group, mercapto group, epoxy group, hydrosilyl group and the like are used. The viscosity at 25 ° C. is 100,000 mPa · s or more, preferably 1,000,000 mPa · s or more.

  As the reaction initiator, known acetophenone, propiophenone, benzophenone, xanthol, fluorin, benzaldehyde, anthraquinone, triphenylamine, carbazole, 3-methylacetophenone, 4-methylacetophenone, 3-pentylacetophenone, 4 -Methoxyacetophenone, 3-bromoacetophenone, 4-allylacetophenone, p-diacetylbenzene, 3-methoxybenzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, 4,4'-dimethoxybenzophenone, 4-chloro-4'-benzyl Benzophenone, 3-chloroxanthol, 3,9-dichloroxanthol, 3-chloro-8-nonylxanthol, benzoin, benzoin methyl ether, benzoin butyl ether Le, bis (4-dimethylaminophenyl) ketone, benzyl methoxy ketal, 2-chlorothioxanthone Torr, and the like. The blending amount is preferably 0.1 to 20 parts by mass, particularly preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the base polymer organopolysiloxane.

  Further, by applying a primer to the endless belt 1, the adhesiveness of the silicone adhesive can be enhanced. Most of the primers are obtained by dispersing a surface treatment agent containing various substances in a solvent. In the primer, the surface treatment agent is preferably a silane coupling agent. The silane coupling agent is more preferably blended in an amount of 1 to 50 parts by mass with respect to 100 parts by mass of the solvent.

  Here, the preferable blending amount of the silane coupling agent is in the range of 1 to 50 parts by mass with respect to 100 parts by mass of the dispersion medium. Because it occurs. Conversely, if this range is exceeded, there is a negative effect that processability is reduced.

  As silane coupling agents, epoxy group-containing silanes or partial hydrolysis condensates thereof, (meth) acrylic group-containing silanes or partial hydrolysis condensates thereof, vinyl group-containing silanes or partial hydrolysis condensates thereof, cyclic It is preferable to use one or two or more substances selected from the group consisting of siloxane, chain siloxane, and cyanuric ring-containing organosilicon compound.

  Examples of epoxy group-containing silanes include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyl (methyl) dimethoxysilane, 2- (3,4-epoxycyclohexyl) ) Ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyl (methyl) triethoxysilane, and the like. Examples of (meth) acrylic group-containing silanes include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropyl (methyl) dimethoxysilane, and the like.

  Examples of the vinyl group-containing silane include vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltris (2-methoxyethoxy) silane. Examples of cyclic siloxanes include 3-glycidoxypropyl group-containing methylhydrogen cyclic tetrasiloxane, 3-methacryloxypropyl group-containing methylhydrogen cyclic tetrasiloxane, and 3-glycidoxypropyl group-containing methylmethoxy cyclic siloxane. Methylhydrogen cyclic siloxane having 3-glycidoxypropyl group and 2- (trimethoxysilyl) ethyl group, methylhydrogen cyclic siloxane having 3-methacryloxypropyl group and 2- (trimethoxysilyl) ethyl group, Examples include 2-[(3-trimethoxysilyl) propyloxycarbonyl] propyl group-containing methylhydrogen cyclic siloxane.

  Examples of chain siloxanes include 3-glycidoxypropyl group-containing methylmethoxysiloxane, 3-glycidoxy group and methylhydrogensiloxane having vinyl group, 3-glycidoxy group and 2- (trimethoxysilyl) ethyl group And methyl siloxane.

  Examples of the cyanuric ring-containing organosilicon compound include tris (3-trimethoxysilylpropyl) isocyanurate. Since these primers are applied to the endless belt 1 using a brush or the like, the primer is applied by a coating machine such as a spray coater or a roll coater, or the endless belt 1 is dipped and applied in the primer solution. Is possible.

  The polymerization layer 3 is made of a metal foil, a film, or a fiber cloth, and functions to improve durability and the like. Examples of the metal foil include gold, silver, copper, nickel, iron, tin, and aluminum foil, and the type of metal is not limited. The thickness of metal foil should just be 5-500 micrometers. When the thickness is 5 μm or less, workability deteriorates, and when it exceeds 500 μm, flexibility is impaired.

  Examples of the film include various organic polymer films made of polyethylene terephthalate or vinyl chloride, and the material is not particularly limited. The thickness of the film may be 5 to 500 μm. This is based on the reason that the work is difficult when the thickness is 5 μm or less, and the flexibility is impaired when the thickness exceeds 500 μm.

  The material of the fiber cloth is not particularly limited, but may be a thickness in the range of 5 to 500 μm. This is based on the reason that the work becomes difficult when the thickness is 5 μm or less, and the flexibility is impaired when the thickness exceeds 500 μm.

  In the above, when manufacturing the meander-preventing guide tape for the endless belt 1, first, the formed strip-shaped guide tape 2 is adhered to both side portions of the inner peripheral surface of the endless belt 1, and each guide tape is attached. Both ends of 2 are butted and the connecting portion is smoothed with a spatula or the like (not shown). At this time, since the guide tape 2 is a regular silicone adhesive, handling and work are really easy. If the connecting portion of the guide tape 2 is smoothed in this way, the endless belt 1 and the guide tape 2 can be integrated by curing under a predetermined curing condition.

  According to the above configuration, the hot melt adhesive melted at 180 to 200 ° C. is not applied to the endless belt 1, but a fixed silicone adhesive that exhibits both the guide function and the adhesive function is bonded and cured to guide tape. Therefore, the endless belt 1 made of a thermoplastic resin is not likely to be thermally deformed. Further, the shape of the silicone adhesive can be held very easily. Moreover, since the both ends which the guide tape 2 faces can be made smooth easily, generation | occurrence | production of a level | step difference can be suppressed and prevented. Therefore, the endless belt 1 meanders and the exposure position and the transfer position do not shift, thereby preventing image unevenness and image displacement.

Examples of the endless belt meandering prevention guide tape according to the present invention will be described below together with comparative examples.
Example 1
(Hydrosilylation reaction silicone adhesive)

  First, a colorless transparent flowable solid-terminated vinyldimethylsiloxy group having a ratio of a substituent having 2 or more carbon atoms (vinyl group) to all substituents bonded to silicon atoms in a kneader (kneader) is 0.44 mol%. 100 parts by mass of blocked dimethylsiloxane and vinylmethylsiloxane copolymer (viscosity 20 million mPa · s, Williams plasticity 90) and dry silica whose surface is treated with dimethyldichlorosilane (manufactured by Nippon Aerosil Co., Ltd., Erosil R972) 30 masses And 2 parts by mass of dimethylpolysiloxane having a degree of polymerization of dimethylhydroxysilyl group blocking at both ends of about 10 were uniformly mixed, mixed and cooled while heating at 150 ° C./1 hour in a nitrogen aeration atmosphere.

  Subsequently, using a mixing roll, in a cooled state, 100 parts by mass of the kneaded product, and a dimethylsiloxane / methylhydrogensiloxane copolymer (the amount of methylhydrogensiloxane is 0.7 mol / 100 g) 1.72. Parts by mass, 0.27 parts by mass of chloroplatinic acid solution (5 parts by mass of chloroplatinic acid diluted in 2-ethylhexanol), 1 part by mass of vinyltriethoxysilane, 3-methyl-1-butyn-3-ol 0 0.05 parts by mass were uniformly kneaded to prepare a composition.

(Measurement of plasticity)
Using a parallel plate plasticity meter (Williams Plastometer) with a Williams plasticity immediately after kneading of the above composition at 25 ° C., according to the measurement method prescribed in JIS K 6249 “Testing method for uncured and cured silicone rubber” It was 183 when measured.

  Specifically, 2 g of polyorganopolysiloxane was used as a cylindrical test piece, and the test piece was sandwiched between cellophane papers and set in a parallel plate plasticity meter with a dial gauge (manufactured by Ueshima Seisakusho; Williams Plastometer). A 5 kg load was applied and left for 3 minutes. The dial gauge scale was read to millimeters, and then the thickness of the test piece was recorded, and this value was multiplied by 100 to obtain the Williams plasticity.

(Shaping)
The above composition was shaped on a OPP (biaxially stretched polyethylene) film (40 μm) in a 5 mm width and 1 mm thickness using a single screw extruder in an environment of 23 ° C. and 50% RH.
(Installation on endless belt)
Guide tapes were adhesively cured on both sides of the inner peripheral surface of a polycarbonate endless belt having a thickness of 150 μm, a diameter of 200 mmφ, and a width of 200 μm. The obtained endless belt was used to evaluate image shift and durability, and the results are summarized in Table 1.

(Image shift)
A 200 mm wide endless belt with a guide tape on both ends was tested with an intermediate transfer device in a roll diameter of 25 mmφ, a roll speed of 100 mm / min, an endless belt tension of 80 N / 200 mm, 23 ° C., and 50% RH atmosphere. A transfer image on a recording paper having a transfer deviation of 0.2 mm or less was marked with ◯, and a transfer image exceeding 0.2 mm was marked with x.
(durability)
Similar to the evaluation conditions for image displacement, the case where the endless belt was driven continuously for 72 hours and no crack was generated was marked with ◯, and the case where the crack occurred within 72 hours was marked with x.

Example 2
(Condensation reaction silicone adhesive)
In a closed kneader, 100 parts by mass of polydimethylsiloxane having hydroxyl groups at both ends and 30 parts by mass of dry silica (Erosyl R972, manufactured by Nippon Aerosil Co., Ltd.), the surface of which was treated with dimethyldichlorosilane, were uniformly mixed. A composition was prepared by mixing 4 parts by mass of methyl ethyl ketoxime silane and 0.05 parts by mass of dibutyltin dioctoate under reduced pressure until uniform.

(Measurement of plasticity)
The plasticity immediately after kneading of the composition was measured in accordance with JIS K 6249 using a parallel plate plasticity meter, and was 173 when a load was applied for 3 minutes.
(Shaping)
The above composition was shaped on a OPP (biaxially stretched polyethylene) film (40 μm) in a 5 mm width and 1 mm thickness using a single screw extruder in an environment of 23 ° C. and 50% RH.
(Installation on endless belt)

  The guide tape was cured and bonded to both sides of the inner peripheral surface of a polycarbonate endless belt having a thickness of 150 μm, a diameter of 200 mmφ, and a width of 200 μm. The obtained endless belt was used to evaluate image shift and durability, and the results are summarized in Table 1.

(Comparative example)
A polyurethane sheet having a thickness of 1 mm and a width of 5 mm as a meandering prevention guide was adhered to both side portions of the inner peripheral surface of the endless belt similar to those of Examples 1 and 2 using a rubber adhesive. Image endurance and durability were evaluated using an endless belt provided with this meandering prevention guide, and the results are summarized in Table 1.

It is a perspective explanatory view showing an embodiment of the meandering prevention guide tape of the endless belt according to the present invention. It is a section explanatory view showing an embodiment of a meandering prevention guide tape of an endless belt concerning the present invention. It is sectional explanatory drawing which shows the conventional endless belt and its meandering prevention guide.

Explanation of symbols

1 Endless belt 2 Guide tape 3 Polymerized layer 5 Adhesive layer

Claims (3)

An endless belt meandering prevention guide tape provided with a meandering prevention guide tape in the circumferential direction on at least one side of the inner peripheral surface of the endless belt,
A guide tape for preventing meandering of an endless belt, characterized in that the guide tape is formed into a predetermined shape before curing and is a silicone adhesive that is bonded to and integrated with the inner peripheral surface of the endless belt after curing.   The meandering prevention guide tape for an endless belt according to claim 1, wherein the plasticity before curing of the silicone adhesive when measured with a Williams plasticity meter is set in the range of 30 to 500. 3. A meandering-preventing guide tape for an endless belt according to claim 1, wherein a polymer layer is provided on the silicone adhesive, and the polymer layer is a metal foil, a film, and / or a fiber cloth.

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