JP6105510B2 - Paper feed roller and manufacturing method thereof - Google Patents

Description

  The present invention relates to an elastic body of a paper feed roller, a manufacturing method thereof, and a paper feed roller, and more preferably to an elastic body of a paper feed roller for transporting paper after toner fixing, a manufacturing method thereof, and the paper feed roller thereof.

  A plurality of paper feed rollers having various uses are provided in an OA device such as an electrostatic copying machine, a laser printer or a facsimile, or an automatic deposit payment machine. These paper feed rollers are required to have various characteristics depending on the application, and various studies have been conducted to satisfy such requirements.

  For example, Patent Document 1 describes a paper sheet separation pad that has a high friction coefficient but does not have a paper sheet sticking and has a small variation in friction coefficient and hardness depending on the part. The paper sheet separation pad described in Patent Document 1 is incorporated in an apparatus for separating and supplying shaped paper or banknotes, and is a foam or solid formed by blending an additive having a reactive group with polyurethane. Consists of.

  Patent Documents 2 and 3 describe inventions related to a paper feed roller. Patent Document 2 discloses a silicone rubber composition for paper feed that has a sufficient coefficient of friction over time as a paper feed roller. The silicone rubber composition for paper feeding described in Patent Document 2 is composed of reinforcing filler 3 to 500 parts by weight, necessary amount of filler, and necessary amount of curing agent with respect to 100 parts by weight of vinyl group-containing organopolysiloxane raw rubber. It is formed by blending 2 to 30 parts by weight of dimethyl silicone oil with a blend composed of (vulcanizing agent and crosslinking agent). Patent Document 2 also describes that dimethyl silicone diol is preferably used as the dimethyl silicone oil.

  Patent Document 3 describes a silicone rubber composition for a paper feed roller that has a high coefficient of friction that is optimal for conveying copy paper, print paper, original paper, and the like and that is less worn. The silicone rubber composition for a paper feed roller described in Patent Document 3 contains 8 to 50 parts by weight of carbon black and 1 to 10 parts by weight of amino-modified silicone oil with respect to 100 parts by weight of silicone rubber.

  Patent Documents 4 and 5 describe a developing roller. Patent Document 4 aims to provide a developing roller that does not cause toner leakage even when used at a medium speed or higher. In order to achieve this object, Patent Document 4 discloses that a developing roller includes a core metal, a conductive layer provided on the peripheral surface of the core metal, and a polyurethane-silicone provided on the peripheral surface of the conductive layer. It is also described that the coating layer has a elongation at break of 100% or more.

  Patent Document 5 aims to provide a developing roller capable of obtaining an excellent image by suppressing toner adhesion. In order to achieve this object, Patent Document 5 discloses that the surface layer formed on the outer periphery of the elastic layer of the developing roller is (A) a polyether polyol having two or more functional groups, and has a number average molecular weight. It is described that it is formed by using a resin composition having (B) diisocyanate and (C) reactive silicone oil as essential components within the range of 400 to 3,000. It is also described that the blending amount is in the range of 0.5 to 30% by weight of the entire resin composition. Furthermore, in the Example of patent document 5, polyether polyol, isocyanate, and reactive silicone oil are mix | blended in a predetermined ratio, these are mix | blended and melt | dissolved in an organic solvent (MEK), and a coating of 20 weight% concentration is carried out. It is also described that the solution was prepared, and that this coating solution was applied along the outer peripheral surface of the intermediate layer, and then the surface layer was formed by performing oven heating vulcanization at 170 ° C. for 1 hour. .

  Patent Document 6 describes a paper feed roller after toner fixing, which is excellent in both hydrolysis resistance and wax swelling resistance. The elastic body layer of the paper feed roller described in Patent Document 6 is formed by crosslinking a rubber composition. The polymer component of the rubber composition includes an ester-based polyurethane and an ether-based polyurethane, and the ester-based polyurethane / ether-based polyurethane in the rubber composition has a mass ratio of 90/10 to 50/50. The rubber composition contains 10 to 40 parts by mass of a filler with respect to 100 parts by mass of the polymer component.

JP 2001-322733 A JP 2002-37473 A JP 2002-146191 A JP 2005-345619 A JP 2007-148100 A JP2012-141024

  Even in a paper feed roller (hereinafter simply referred to as “paper feed roller”) for transporting the paper after toner fixing, the toner may adhere to the surface of the elastic body. When the toner adheres to the surface of the elastic body, the paper transporting force of the paper feed roller is reduced, which may cause a paper jam.

  The present invention has been made in view of this point, and an object of the present invention is to provide an elastic body of a paper feed roller in which toner hardly adheres to the surface. Another object of the present invention is to provide a method for manufacturing the elastic body, and to provide a paper feed roller provided with the elastic body.

  The elastic body of the paper feed roller according to the present invention includes a polyol component, an isocyanate component, and a both-end-modified silicone oil component. The both-end-modified silicone oil is preferably blended in an amount of 0.3 to 20 parts by weight, more preferably 0.5 to 10 parts by weight, based on 100 parts by weight of the total amount of polyol and isocyanate. The following are blended. Both terminal-modified silicone oil components are preferably graft-polymerized, block-polymerized or random-polymerized on a urethane skeleton containing a polyol component and an isocyanate component.

  The method for producing an elastic body of a paper feed roller according to the present invention includes a preparation step of preparing a urethane prepolymer, a reaction step of reacting a urethane prepolymer, a curing agent having an active hydrogen group, and both-end-modified silicone oil, including. The reaction step is a step of blending both terminal-modified silicone oils, preferably 0.3 parts by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the total blending amount of the urethane prepolymer and the curing agent having an active hydrogen group. More preferably, the process of mix | blending 0.5 mass part or more and 10 mass parts or less is included.

  The paper feed roller according to the present invention includes a shaft body and the elastic body of the present invention provided on the outer peripheral surface of the shaft body. The roll hardness of the paper feed roller according to the present invention is preferably 60 to 90 degrees durometer A hardness.

  In the present invention, the toner can be prevented from adhering to the surface of the elastic body of the paper feed roller.

It is a side view which shows an example of the paper feed roller of this invention. (A)-(c) is a side view which shows the criteria of the wettability of the paraffin wax with respect to the elastic body of a paper feed roller in an Example and a comparative example.

  Hereinafter, a configuration of an elastic body of a paper feed roller of the present invention, a method for manufacturing the elastic body, and a paper feed roller including the elastic body will be described with reference to the drawings. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts. In addition, dimensional relationships such as length, width, thickness, and depth are changed as appropriate for clarity and simplification of the drawings, and do not represent actual dimensional relationships.

[Configuration of paper feed roller]
FIG. 1 is a side view showing an example of the paper feed roller of the present invention. The paper feed roller 10 of the present invention is provided in an OA device such as an electrostatic copying machine, a laser printer or a facsimile, or an automatic deposit payment machine, and is preferably used for transporting paper after toner fixing. As shown in FIG. 1, the paper feed roller 10 of the present invention includes a shaft body 11 and an elastic body 12 provided on the outer peripheral surface of the shaft body 11. The paper feed roller 10 has a function of conveying the paper 13 by rotating while applying a certain pressure to the paper 13.

<Shaft>
The shaft body 11 plays a role as the center of the rotation shaft when the paper feed roller 10 rotates. The shaft body 11 is preferably made of a metal material or a synthetic resin material. The metal material is preferably, for example, iron, stainless steel or aluminum. The synthetic resin material is preferably, for example, acrylonitrile butadiene styrene copolymer, polycarbonate, polyacetal, or urethane resin.

<Elastic body>
The elastic body 12 includes a polyol component, an isocyanate component, and a both-end-modified silicone oil component. Since the elastic body 12 containing the urethane composition as a main component further contains both terminal-modified silicone oil components, the toner can be prevented from adhering to the surface of the elastic body 12. Thereby, the paper conveyance force of the paper feed roller 10 can be maintained. Therefore, occurrence of paper jam can be prevented. In the present invention, “toner adheres to the surface of the elastic body 12” means that the toner wets and spreads on the surface of the elastic body 12. The lower the wettability of the toner on the surface of the elastic body 12, the more the paper conveyance force of the paper feed roller 10 is maintained, so that the occurrence of paper jam can be prevented.

<Polyol component, polyol>
“Polyol component” means a component derived from a polyol. "Polyol component" will not be specifically limited if it is used for a normal urethane composition.

  The polyol preferably has two or more hydroxyl groups in the molecule, and is preferably, for example, a polyether polyol, a polymer polyol, or a polyester polyol. As the polyol, polyether polyol, polymer polyol or polyester polyol may be used alone, or at least two of polyether polyol, polymer polyol and polyester polyol may be mixed and used. The polyol may be a curing agent having an active hydrogen group (described later), and specific examples of the curing agent having an active hydrogen group are as described below.

  The polyether polyol is a polyol having an ether bond in the molecule and is obtained, for example, by a dehydration condensation reaction of the polyol. As the polyether polyol, for example, polyoxyethylene glycol (PEG), polyoxypropylene glycol (PPG), polyoxytetramethylene glycol (PTMG), or polyvinyl ether polyol can be used. Moreover, as polyether polyol, you may use what was manufactured by ring-opening polymerization or copolymerization of cyclic ether. The cyclic ether is preferably, for example, ethylene oxide, propylene oxide, trimethylene oxide, butylene oxide, α-methyltrimethylene oxide, 3,3′-dimethyltrimethylene oxide, tetrahydrofuran, dioxane or dioxamine. As the polyol, one kind of polyether polyol may be used alone, or two or more kinds of polyether polyols may be mixed and used.

  The polymer polyol is a polyol having a polymer portion in the molecule, and can be obtained by, for example, copolymerizing acrylonitrile or styrene in a polyether polyol and dispersing the resulting polymer fine particles. As the polyether polyol used for the production of the polymer polyol, at least one of the materials listed above can be used without any particular limitation. As the polyol, one kind of polymer polyol may be used alone, or two or more kinds of polymer polyols may be mixed and used.

  The polyester polyol is a polyol having an ester bond in the molecule, and can be obtained, for example, by a dehydration condensation reaction between several carboxylic acids and an alcohol. Examples of the polyester polyol include a dicarboxylic acid such as adipic acid, isophthalic acid or terephthalic acid and an alcohol such as ethylene glycol, propylene glycol, diethylene glycol, butylene glycol, 1,6-hexanediol, trimethylolpropane or neopentyl glycol. A condensation reaction product can be used. Further, as the polyester polyol, polycaprolactone polyol or polycarbonate polyol can also be used. As the polyol, one type of polyester polyol may be used alone, or two or more types of polyester polyols may be mixed and used.

<Isocyanate component, isocyanate>
“Isocyanate component” means a component derived from isocyanate. The “isocyanate component” is not particularly limited as long as it is used in a normal urethane composition.

  The isocyanate preferably has two or more isocyanate groups. For example, 4,4′-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-toluene diisocyanate ( 2,6-TDI), 4,4′-diphenylmethane diisocyanate (MDI), paraphenylene diisocyanate (PPDI), 1,5-naphthalene diisocyanate (NDI), hexamethylene diisocyanate (HDI), 3,3-dimethyldiphenyl-4 , 4′-diisocyanate (TODI), 3,3′-dimethyldiphenylmethane-4,4′-diisocyanate, 2,4-tolylene diisocyanate uretidinedione (dimer of 2,4-TDI), metaphenylene diisocyanate, Isoho Down diisocyanate, 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI), carbodiimide-modified MDI, ortho-toluidine diisocyanate, it is preferable that in xylene diisocyanate or lysine diisocyanate methyl ester. As the isocyanate, one kind of isocyanate may be used alone, or two or more kinds of isocyanate may be mixed and used.

<Both ends modified silicone oil component, Both ends modified silicone oil>
The “both terminal-modified silicone oil component” means a component derived from both terminal-modified silicone oil, and is not particularly limited as long as it is a conventionally known both terminal-modified silicone oil.

  Both-end-modified silicone oil is a silicone oil having functional groups at both ends. The functional group is preferably, for example, an amino group, an epoxy group, a carboxyl group, a carbinol group, a methacryl group, a polyether group, a mercapto group, a phenol group, or a silanol group. In the both-end-modified silicone oil, the functional groups at both ends may be the same or different from each other. The functional group equivalent of the both-end modified silicone oil is not particularly limited, but is preferably 5700 g / mol or less from the viewpoint of preventing the occurrence of bleeding.

  Such a terminal-modified silicone oil is preferably blended in an amount of 0.3 to 20 parts by mass with respect to 100 parts by mass of the total amount of polyol and isocyanate. If the blended amount of the both-end modified silicone oil (hereinafter referred to as “blended amount of both-end-modified silicone oil”) with respect to 100 parts by mass of the total blended amount of polyol and isocyanate is 0.3 parts by mass or more, Compared with the case where the blending amount is less than 0.3 parts by mass, the toner is less likely to adhere to the surface of the elastic body 12. If the blending amount of the both terminal-modified silicone oil is 20 parts by mass or less, it is possible to prevent the moldability of the elastic body 12 from being lowered as compared with the case where the blending amount exceeds 20 parts by mass.

  More preferably, the blending amount of the both terminal-modified silicone oil is 0.5 parts by mass or more and 10 parts by mass or less. The more the both-end modified silicone oil is added, the more difficult the toner adheres to the surface of the elastic body 12. Therefore, if the blending amount of both terminal-modified silicone oils is 0.5 parts by mass or more, the toner becomes more difficult to adhere to the surface of the elastic body 12. When the blending amount of the both-end-modified silicone oil is 10 parts by mass or less, it is possible to provide the elastic body 12 in which the toner hardly adheres to the surface without causing deterioration of the moldability of the elastic body 12. The lower limit value of the blending amount of both terminal-modified silicone oils is more preferably 2 parts by mass, and the upper limit value of the blending amount of both terminal-modified silicone oils is more preferably 5 parts by mass.

  If the blending amount of the both-end modified silicone oil is 10 parts by mass or less, the following effects can also be obtained. When the blending amount of the both-end-modified silicone oil exceeds a certain amount, the effect that the toner hardly adheres to the surface of the elastic body 12 may be saturated. However, if the blending amount of the both terminal-modified silicone oil is 10 parts by mass or less, this effect can be prevented from becoming saturated. Moreover, since the manufacturing cost of the elastic body 12 can be kept low, the manufacturing cost of the paper feed roller 10 can be kept low. Furthermore, the occurrence of bleeding can be prevented. In addition, since the roll hardness can be maintained high and the wear resistance of the elastic body 12 can be maintained high, the paper feed roller 10 having excellent characteristics can be provided. Therefore, it is possible to prevent the use of the manufactured paper feed roller 10 from being limited to a specific use.

  The elastic component 12 of the present invention may be produced by reacting the polyol component, the isocyanate component, and the both-end-modified silicone oil component at once (this production method of the elastic material 12 is hereinafter referred to as “one-shot method”). ). However, after producing a urethane prepolymer with a polyol and an isocyanate, the elastic body 12 of the present invention can be produced using the urethane prepolymer, a curing agent having an active hydrogen group, and a both-end-modified silicone oil. preferable. (This manufacturing method of the elastic body 12 is hereinafter referred to as a “prepolymer method”). In the one-shot method, a large amount of heat is generated during the polymerization reaction such as the urethanization reaction because the reaction is performed at one time. Therefore, the one-shot method has a drawback that stable physical characteristics cannot be obtained. On the other hand, the prepolymer method has a drawback that when the viscosity of the prepolymer is high, defoaming is poor at the time of molding, thus making the molding operation difficult. However, the prepolymer method has an advantage that stable physical characteristics can be obtained as compared with the one-shot method, because the heat accompanying the urethanization reaction has already been released during the prepolymerization. The prepolymer method also has an advantage that high physical properties can be obtained compared to the one-shot method because the reaction proceeds uniformly.

  Below, the material used in order to obtain the elastic body of this invention by the prepolymer method is demonstrated. The elastic body obtained by the prepolymer method contains a urethane prepolymer, a curing agent having an active hydrogen group, and a both-end-modified silicone oil.

<Urethane prepolymer>
The “urethane prepolymer” is a polymer obtained by reacting a polyol with an excess of isocyanate, and contains an isocyanate group which may be substituted at both ends. The urethane prepolymer may be a linear polymer, or the component derived from the monomer may be branched from the linear polymer and bonded to the linear polymer, or derived from the monomer. The component to have may have an aromatic ring.

  As the polyol constituting the urethane prepolymer, the polyol described in the above <polyol component, polyol> can be used without any particular limitation, and one kind of polyol described in the above <polyol component, polyol> can be used alone. Or two or more polyols described in the above <Polyol component, polyol> may be used in combination.

  As the isocyanate constituting the urethane prepolymer, the isocyanate described in the above <isocyanate component, isocyanate> can be used without particular limitation, and one type of isocyanate described in the above <isocyanate component, isocyanate> is used alone. Or two or more isocyanates described in the above <Isocyanate component, isocyanate> may be used in combination.

  The method for producing the urethane prepolymer, particularly the reaction conditions between the polyol and excess isocyanate, is not particularly limited.

<Curing agent having active hydrogen group, curing agent>
The “curing agent having an active hydrogen group” means a molecule having two or more active hydrogen groups in the molecule. The “active hydrogen group” is a functional group that reacts with an isocyanate group to generate a urethane group, and is preferably a hydroxyl group or an NH ₂ group, for example. As the curing agent having an active hydrogen group, a curing agent having a hydroxyl group may be used, a curing agent having an NH ₂ group may be used, or a curing agent having both a hydroxyl group and an NH ₂ group may be used. Alternatively, a curing agent having a hydroxyl group and a curing agent having an NH ₂ group may be mixed and used.

  Examples of the curing agent having a hydroxyl group include ethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1 , 5-pentanediol, 1,6-hexanediol, neopentyl glycol, cyclohexanediol, cyclohexanedimethanol, 2-methyl-1,3-propanediol, 3-methyl-1,5-pentanediol, glycerin, trimethylol There are propane, pentaerythritol, erythritol, sorbitol, phenol, 2-phenoxyethanol and the like.

Examples of the curing agent having an NH ₂ group include ethylenediamine, 1,2-diaminoethane, 1,2-diaminopropane, 1,2-diaminobutane, 1,5-diaminopentane, 1,6-diaminohexane, and piperazine. A diamine such as N-ethyldiethylenetriamine or diethylenetriamine may be used. As a hardening | curing agent which has an active hydrogen group, these may be used independently and may be used in mixture of 2 or more types.

<Both-end modified silicone oil>
As the both-end-modified silicone oil, the both-end-modified silicone oil described in the above <Both-end-modified silicone oil component, both-end-modified silicone oil> can be used without any particular limitation. One end-modified silicone oil as described in Both-end-modified silicone oil component, Both-end-modified silicone oil> may be used alone, or both ends-modified silicone oil component, Both-end-modified silicone oil Two or more types of both-end-modified silicone oils described in "Type Silicone Oil>" may be used in combination.

  The blending amount of the both-end modified silicone oil is as described in the above <Both-end-modified silicone oil component, Both-end-modified silicone oil>. That is, the both-end-modified silicone oil is preferably blended in an amount of 0.3 to 20 parts by weight, more preferably 100 parts by weight, based on the total blending amount of the urethane prepolymer and the curing agent having an active hydrogen group. Is blended in an amount of 0.5 to 10 parts by mass. The lower limit of the blending amount of the both-end modified silicone oil with respect to 100 parts by weight of the total blending amount of the urethane prepolymer and the curing agent having an active hydrogen group is more preferably 2 parts by weight, and the upper limit of the blending amount is More preferably, it is 5 parts by mass.

<Roll hardness>
The paper feed roller 10 of the present invention preferably has a durometer A hardness of 60 degrees or more and 90 degrees or less, more preferably a durometer A hardness of 70 degrees or more and 80 degrees or less. When the durometer A hardness of the paper feed roller is less than 60 degrees, in a high-speed machine with a high printing speed, the deformation of the roller may become large, and a tendency to lower the conveyance accuracy is seen. In addition, the elastic body does not have wear resistance, and the conveyance accuracy may be reduced. On the other hand, if the durometer A hardness of the paper feed roller exceeds 90 degrees, the nip amount becomes small, the friction coefficient becomes too low, and there is a possibility that a necessary conveying force cannot be ensured. The durometer A hardness can be measured according to JIS K 6253.

[Paper feed roller manufacturing method]
If the elastic body 12 is fitted into the shaft body 11, the paper feed roller 10 shown in FIG. 1 can be manufactured. As described above, the elastic body 12 may be manufactured by the one-shot method, or the elastic body 12 may be manufactured by the prepolymer method. When the elastic body 12 is produced by the one-shot method, the both-end modified silicone oil is preferably blended in an amount of 0.3 to 20 parts by mass with respect to 100 parts by mass of the total amount of polyol and isocyanate. More preferably, 0.5 parts by mass or more and 10 parts by mass or less are blended. It is more preferable that the lower limit of the blending amount of both terminal-modified silicone oils with respect to 100 parts by weight of the total blending amount of polyol and isocyanate is 2 parts by weight, and the upper limit of the blending amount is 5 parts by weight. preferable. Below, it describes about the method of manufacturing the elastic body 12 using a prepolymer method.

<Preparation process>
Prepare urethane prepolymer. The urethane prepolymer to be prepared is preferably the urethane prepolymer described in the above <urethane prepolymer>, and the polyol described in the above <polyol component, polyol> and the isocyanate described in the above <isocyanate component, isocyanate>. It is preferable that it is a urethane prepolymer obtained by making it react.

<Reaction process>
Next, the urethane prepolymer, the curing agent having an active hydrogen group, and the both-end modified silicone oil are reacted. It is preferable to use the curing agent described in the above <curing agent having active hydrogen group, curing agent>, and the both-end modified silicone oil described in the above <both end-modified silicone oil component, both end-modified silicone oil>. Is preferably used. More preferably, both end-modified silicone oils are blended in an amount of 0.3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the total blending amount of the urethane prepolymer and the curing agent having active hydrogen groups. More preferably, both end-modified silicone oils are blended in an amount of 0.5 to 10 parts by mass with respect to 100 parts by mass of the total amount of urethane prepolymer and curing agent having an active hydrogen group. It is even more preferable that the lower limit of the blending amount of the both-end-modified silicone oil with respect to 100 parts by weight of the total blending amount of the urethane prepolymer and the curing agent having an active hydrogen group is 2 parts by weight, and the upper limit of the blending amount. Is more preferably 5 parts by mass.

  The blended mixture is poured into a cylindrical mold and heated at a predetermined temperature (100 ° C. to 120 ° C.) for a predetermined time (for example, 1 hour to 3 hours) to obtain a cured body. The obtained cured body is removed from the mold and secondarily cured at a predetermined temperature (for example, 100 ° C. to 120 ° C.) for a predetermined time (for example, 8 hours to 16 hours), thereby forming a cylindrical elastic body 12. The

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these.

<Comparative Examples 1-14, Examples 1-12>
First, the urethane prepolymer shown in Table 5 was defoamed and dehydrated at 60 ° C. for 2 hours under a nitrogen atmosphere. Next, the materials shown in each of Tables 1 to 4 were heated to 60 ° C. and stirred and mixed according to the blending amounts (parts by mass) shown in Tables 1 to 4. This was poured into a cylindrical mold heated to 110 ° C. and heated for 2 hours to obtain a cured body. The obtained cured body was removed from the mold and secondarily cured at 110 ° C. for 12 hours to obtain a cylindrical elastic body 12. Then, the obtained elastic body was fitted into a metal shaft, and the outer periphery of the elastic body was polished to a predetermined size with a cylindrical polishing disk, thereby obtaining the paper feed roller of this example.

(1) Urethane prepolymer A
The polyol and isocyanate constituting the urethane prepolymer A are as shown in Table 5, and the NCO content (%) of the urethane prepolymer A is also as shown in Table 5.
(2) Urethane prepolymer B
The polyol and isocyanate constituting the urethane prepolymer B are as shown in Table 5, and the NCO content (%) of the urethane prepolymer B is also as shown in Table 5.
(3) Curing agent A
1,4-butanediol (manufactured by Wako Pure Chemical Industries, Ltd.).
(4) Curing agent B
Polypropylene glycol (PPG) having a number average molecular weight of 430.
(5) Curing agent C
It is a mixture of 3,5-bis (methylthio) -2,6-toluenediamine and 3,5-bis (methylthio) -2,4-toluenediamine.
(6) Plasticizer A
It is an adipic acid ether ester plasticizer (manufactured by ADEKA Corporation).
(7) Silicone oil A
Dimethyl silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.).
(8) Side chain modified silicone oil A
Carbinol-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd.).
(9) Side chain modified silicone oil B
Amino-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd.).
(10) Both-end modified silicone oil A
Carbinol-modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.).
(11) Both-end modified silicone oil B
Amino-modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.).
(12) Both-end modified silicone oil C
It is a phenol-modified silicone oil (manufactured by Shin-Etsu Chemical Co., Ltd.).
(13) Silicone powder A
Polymethylsilsesquioxane (manufactured by Shin-Etsu Silicone Co., Ltd.).
(14) Silicone powder B
The surface of spherical silicone rubber powder is coated with a silicone resin (manufactured by Shin-Etsu Silicone Co., Ltd.).
(15) Fluorine powder A
PTFE (manufactured by Sumitomo 3M Limited).
(16) Foam stabilizer (surfactant) A
Made by Toray Dow Corning Co., Ltd.
(17) Conductive agent (ionic liquid) A
1-butyl-3-methylpyridinium bis (trifluoromethanesulfonic acid) imide (manufactured by Nippon Carlit Co., Ltd.).

<Durometer A hardness>
The durometer A hardness was measured based on JIS K 6253 for the obtained paper feed rollers of Comparative Examples 1 to 14 and Examples 1 to 12. The results are shown in Tables 1 to 4.

<Wettability>
The obtained paper feed rollers of Comparative Examples 1 to 14 and Examples 1 to 12 were heated to 100 ° C., and paraffin wax (155 manufactured by Nippon Seiwa Co., Ltd.) was dropped onto the heated elastic body. And the shape of the paraffin wax dripped on the elastic body of a paper feed roller was visually recognized. In Tables 1 to 4, the shape of the paraffin wax 21 on the elastic body 12 did not change as shown in FIG. 2A even after 3 minutes had passed since the paraffin wax 21 was dropped on the elastic body 12. In this case, “A1” is indicated. When 3 minutes or more have passed since the paraffin wax 21 was dropped on the elastic body 12, if the paraffin wax 21 spreads on the elastic body 12 as shown in FIG. did. If the paraffin wax 21 wets and spreads on the elastic body 12 as shown in FIG. 2C immediately after the paraffin wax 21 is dropped on the elastic body 12, “C1” is described. If it is A1 and B1 in Tables 1-4, it is considered that the toner hardly adheres to the surface of the elastic body.

  The wettability was lower in Examples 1 to 12 than in Comparative Examples 1 to 13. The following can be considered as this reason. Since the elastic bodies of Examples 1 to 12 contain the both-end modified silicone oil, paraffin wax hardly adheres to the surface of the elastic body. On the other hand, since the elastic bodies of Comparative Examples 1 to 13 do not contain both-end-modified silicone oil, it is difficult to prevent the paraffin wax from adhering to the surface of the elastic body.

  The wettability was lower in Examples 1 to 7 than in Comparative Example 14. Therefore, it turned out that it is preferable to mix | blend 0.3 mass part or more and 20 mass parts or less of both terminal modified | denatured silicone oil with respect to 100 mass parts of total compounding quantities of a urethane prepolymer and a hardening | curing agent.

  In the case where the paraffin wax is dropped on the elastic body of the paper feed roller of the first embodiment, the present inventors drop the paraffin wax on the elastic body of the paper feed roller of the second and third embodiments. It was confirmed that the timing at which the paraffin wax wets and spreads on the elastic body was earlier than that. That is, the wettability was lower in Examples 2 and 3 than in Example 1. Therefore, it turned out that it is more preferable to mix | blend 0.5 mass part or more of both terminal modified silicone oil with respect to 100 mass parts of total compounding quantities of a urethane prepolymer and a hardening | curing agent.

  The wettability was lower in Examples 4 to 7 than in Examples 1 to 3. Therefore, it turned out that it is still more preferable to mix | blend 2 mass parts or more of both terminal modified silicone oil with respect to 100 mass parts of total compounding quantities of a urethane prepolymer and a hardening | curing agent.

  As for the wettability, the same results were obtained in Example 4 and Examples 8 to 11. Therefore, it was found that the type of both-end-modified silicone oil does not affect wettability.

  As for the wettability, the same results were obtained in Example 4 and Example 12. Therefore, it was found that the presence or absence of the plasticizer does not affect the wettability.

  The durometer A hardness was 70 or more in Examples 1 to 6 and Comparative Example 14, whereas it was 63 in Example 7. Therefore, it turned out that it is more preferable to mix | blend 10 mass parts or less of both terminal modified silicone oil with respect to 100 mass parts of total compounding quantities of a urethane prepolymer and a hardening | curing agent.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 paper feed roller, 11 shaft body, 12 elastic body, 13 paper, 21 paraffin wax.

Claims (4)

A paper feed roller for conveying the paper after toner fixing,
A shaft,
A single-layer elastic body provided on the outer peripheral surface of the shaft body,
The elastic body includes a polyol component, an isocyanate component, and a both-end-modified silicone oil component,
The both-end-modified silicone oil is a paper feed roller in which 0.3 parts by mass or more and 20 parts by mass or less are blended with respect to 100 parts by mass of the total blending amount of the polyol and the isocyanate.   2. The paper feed roller according to claim 1, wherein the both-end-modified silicone oil is blended in an amount of 0.5 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the total blending amount of the polyol and the isocyanate. A method of manufacturing a paper feed roller for conveying paper after toner fixing,
Comprising a step of producing a single-layer elastic body provided on the outer peripheral surface of the shaft body,
The step of producing the elastic body includes a preparation step of preparing a urethane prepolymer, and a reaction step of reacting the urethane prepolymer, a curing agent having an active hydrogen group, and both terminal-modified silicone oils,
The reaction step includes a step of blending the both terminal-modified silicone oil with a proportion of 0.3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the total blending amount of the urethane prepolymer and the curing agent. Roller manufacturing method.   The said reaction process includes the process of mix | blending the said both terminal modified | denatured silicone oil 0.5 mass part or more and 10 mass parts or less with respect to 100 mass parts of total compounding quantities of the said urethane prepolymer and the said hardening | curing agent. 4. A method for manufacturing a paper feed roller according to 3.

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