JP4497139B2 - OA equipment roll manufacturing method and OA equipment roll obtained thereby - Google Patents

Description

  The present invention mainly relates to a method for producing rolls for OA equipment used for various members of OA (Office Automation) equipment such as electrophotographic copying machines, printers, facsimiles, etc., and rolls for OA equipment obtained thereby. It is about.

  Conventionally, as a material for forming a foam layer of a roll for OA equipment such as a toner supply roll and a charging roll, for example, a urethane sponge obtained by foaming and curing a polyol with polyisocyanate has been used. The urethane sponge is awarded for its low cost, excellent handleability, and high foaming ratio.

  However, the urethane sponge has a problem that the compressive stress and settling are large and the cell diameter is large. Therefore, in order to solve such problems, the present applicant has proposed a sponge formed by hydrosilyl crosslinking a polyol and curing by foaming as a material for forming the foam layer (Japanese Patent Application No. 2001-88964). However, although the above-mentioned sponge has a relatively fine cell structure, there is a limit to miniaturization of the cell. Therefore, when it is used for a roll for OA equipment as described above, there is a limit to the improvement of a copy image. Furthermore, the proposed sponge has tackiness (stickiness) as its hardness is reduced. For example, when used for a roll member exposed to a foam layer such as a toner supply roll or a cleaning roll, the roll surface However, there is a problem in that toner contamination is remarkably observed, and further improvements have been demanded in these respects.

  The present invention has been made in view of such circumstances, and has a tackiness reduced, a low hardness, a high foaming ratio, a small cell diameter, and a method for producing a roll for OA equipment having a low compressive stress, and thereby obtained. An object of the present invention is to provide a roll for OA equipment.

In order to achieve the above object, the present invention relates to a method for producing a roll for office automation equipment comprising a shaft and a foam layer formed on the outer periphery thereof. The foam layer is mainly composed of the following (A). A method for producing a roll for OA equipment in which the outer peripheral surface of the layer is modified by corona treatment, plasma treatment, or ultraviolet irradiation treatment after being formed from a foamable polymer composition containing the following (B) as a component: The gist of 1 and the roll for OA equipment obtained by the above production method are the second gist.
(A) A polymer having one or more vinyl groups and two or more hydroxyl groups in one molecule, or a polymer having one or more vinyl groups and one or more hydroxyl groups in one molecule and 1 A blend polymer with a polymer having two or more hydroxyl groups in the molecule and no vinyl group.
(B) A crosslinking agent that causes foaming in contact with the above (A) and at the same time causes a crosslinking reaction to the vinyl group.

  That is, the present inventors have intensively studied to solve the above problems. As a result, the organic polymer compound (component A) having one or more vinyl groups in one molecule and a polymer having two or more hydroxyl groups as a main component is brought into contact with the component A and foamed. At the same time, the present inventors have found that the vinyl group is used in combination with a crosslinking agent (component B) that causes a crosslinking reaction. That is, by performing a crosslinking reaction on the vinyl group in the polymer that is the main component of the component A, it is possible to achieve a reduction in tack without hindering the reduction in hardness, and with respect to the vinyl group. Since the crosslinking reaction is a flexible crosslinking, a fine cell structure can be obtained by foaming, and at the same time, a low compressive stress can be obtained. And in the manufacturing method of the roll for OA equipment provided with the axial body and the foam layer formed in the outer periphery, formation of a foam layer by the foaming polymer composition which has the said A component as a main component and contains the said B component When the outer peripheral surface of the layer is modified by corona treatment, plasma treatment or ultraviolet irradiation treatment, only the roll surface is selectively modified (crosslinked) by the above treatment, so that the low hardness is maintained. However, the present inventors have found that the tackiness can be satisfactorily reduced and have reached the present invention.

  As described above, in the method for producing a roll for OA equipment of the present invention, an organic polymer compound (A) having as a main component a polymer having one or more vinyl groups in one molecule and having two or more hydroxyl groups. The foam layer is formed by a foamable polymer composition containing a crosslinking agent (component B) that has a component) as a main component and causes foaming in contact with the component A and at the same time causes a crosslinking reaction to the vinyl group. Thereafter, the outer peripheral surface of the layer is modified by corona treatment, plasma treatment or ultraviolet irradiation treatment. Therefore, tack reduction can be achieved without hindering the reduction in hardness, and a fine cell structure can be obtained by foaming and at the same time a low compressive stress can be obtained. Therefore, it is excellent in toner transportability, and a good image can be obtained when used for an electrophotographic member or the like. Further, since toner is not attracted by tack, toner contamination or the like does not occur, and since the cell diameter is small, toner clogging can be reduced.

  In particular, the organic polymer compound of component A has a polymer having one or more vinyl groups in one molecule and having two or more hydroxyl groups, and two or more hydroxyl groups in one molecule and having a vinyl group. When the polymer is a blend polymer with a non-performing polymer, weather resistance, heat resistance and the like can be improved, and physical properties such as hardness and expansion ratio can be easily adjusted.

  In addition, when the crosslinking agent for the component B is a radical polymerizing agent together with an isocyanate compound, flexible crosslinking is achieved by radical polymerization without incurring an increase in hardness, and a fine cell with respect to the expansion ratio. Can be controlled.

  Moreover, when the crosslinking agent of the component B is a hydrosilyl compound, the generation of hydrogen gas due to the reaction and the reaction of the vinyl group and the hydrosilyl group occur in parallel, and high foamability can be obtained. In particular, when a radical polymerization agent is further contained, more flexible crosslinking is performed.

  Further, when the radical polymerization agent is a peroxide or an azo compound, more flexible crosslinking is performed. In particular, when the azo compound is a silicone group-containing azo compound, release properties due to silicone are imparted, and contamination due to toner adhesion is further prevented.

  And in the manufacturing method of the roll for OA equipment of this invention, since the roll surface is modified by corona treatment, plasma treatment or ultraviolet irradiation treatment, only the roll surface is selectively modified (crosslinked) by the above treatment. In addition, the tackiness is satisfactorily reduced while maintaining low hardness.

  The roll for OA equipment obtained by the production method of the present invention is excellent in flexibility and the like. Among them, the toner supply roll, the charging roll or the cleaning roll using the above composition is clogged with toner or due to toner. Since the problem of contamination does not occur and the hardness is low, it can have excellent characteristics in each field.

  Next, embodiments of the present invention will be described in detail.

  The foamable polymer composition used in the process for producing a roll for OA equipment of the present invention contains a specific organic polymer compound (A component) as a main component and a specific cross-linking agent (B component). And the roll for OA equipment of this invention forms the foaming layer using the said foamable polymer composition. Here, the “main component” means a substance that greatly affects the properties of the composition, and usually means 50% by weight or more of the whole.

  As mentioned above, the specific organic polymer compound (component A) is a polymer having one or more vinyl groups and two or more hydroxyl groups in one molecule, or one in one molecule. It is a blend polymer of a polymer having the above vinyl group and having two or more hydroxyl groups and a polymer having two or more hydroxyl groups in one molecule and no vinyl group.

  Here, a specific polymer (a polymer having one or more vinyl groups and two or more hydroxyl groups in one molecule) which is a main component of the component A has 1 to 1000 vinyl groups in one molecule. If it is a range, it is preferable, More preferably, it is the range of 1-100. That is, if it is within this range, tack can be reduced without inhibiting the reduction in hardness.

  The specific polymer which is the main component of the component A is not particularly limited as long as it is foamed and crosslinked by the specific crosslinking agent (component B), but the structural unit derived from a hydrocarbon polymer is mainly used. What is used as a chain is suitably used, and the hydrocarbon polymer may be either a saturated hydrocarbon polymer or an unsaturated hydrocarbon polymer. And if most of the said main chain is a hydrocarbon, you may have an oxygen atom, a nitrogen atom, a sulfur atom, a halogen atom, an aromatic ring, a heterocyclic ring, etc. in a part of the main chain.

  As the main chain structural units derived from the hydrocarbon polymer, for example, polyolefin polyol, polybutadiene polyol, hydrogenated polybutadiene polyol, polyisoprene polyol, hydrogenated polyisoprene polyol, polyester polyol, polyether polyol, Examples of these two or more copolymer polyols and the like having one or more vinyl groups in one molecule can be given. These may be used alone or in combination of two or more. Among these, vinyl group-containing polyolefin polyol, vinyl group-containing hydrogenated polybutadiene polyol, and vinyl group-containing hydrogenated polyisoprene polyol are preferable in terms of reactivity.

  Examples of the polyolefin polyol include vinyl group-containing polyisobutylene polyol and vinyl group-containing hydrogenated polyisobutylene polyol.

  Examples of the polyester polyol include vinyl group-containing polyethylene adipate, vinyl group-containing polybutylene adipate, vinyl group-containing polyhexylene adipate, vinyl group-containing poly (nonanediol adipate), and vinyl group-containing polycarbonate polyol.

  Examples of the polyether polyol include vinyl group-containing polyoxytetramethylene glycol and vinyl group-containing polypropylene glycol. The hydroxyl group may be either terminal or side chain. Further, carboxylic acid, amino group, urethane, and other modified substituents may be used.

  The specific organic polymer compound (component A) is, as described above, the specific polymer (a polymer having one or more vinyl groups and two or more hydroxyl groups in one molecule) and A blend polymer with a polymer having two or more hydroxyl groups in one molecule and no vinyl group may be used. Examples of the polymer having no vinyl group include polyolefin polyol, polybutadiene polyol, hydrogenated polybutadiene polyol, polyisoprene polyol, hydrogenated polyisoprene polyol, polyester polyol, polyether polyol, etc., and polymers having no vinyl group. Used. Thus, it is preferable to use a blend polymer with a polymer having no vinyl group because weather resistance, heat resistance and the like are improved. The blending ratio of the polymer having no vinyl group is preferably set in a range of 80% by weight or less of the total amount of the component A and blended.

  The number average molecular weight (Mn) of the specific organic polymer compound (component A) is preferably in the range of 100 to 100,000, particularly preferably 1000 to 10,000. That is, if the number average molecular weight (Mn) of the specific organic polymer compound (component A) is less than 100, the crosslink density increases and the hardness increases. Conversely, if it exceeds 100,000, the crosslink density decreases and the tackiness is increased. It is because the tendency which becomes strong, and reactivity becomes bad and a cell enlarges is seen.

  The specific organic polymer compound (component A) preferably has a hydroxyl group at both ends.

  The OH group equivalent of the specific organic polymer compound (component A) is preferably in the range of 100 to 50000, particularly preferably 200 to 2000, from the viewpoint of reactivity and expansion ratio.

  As described above, the specific cross-linking agent (B component) used together with the specific organic polymer compound (A component) is in contact with the A component to cause foaming, and at the same time, the vinyl group is cross-linked. A cross-linking agent that causes a reaction is used. As such a crosslinking agent, for example, a crosslinking agent that performs crosslinking by a hydrosilyl reaction or a urethane reaction is used.

  A hydrosilyl compound is used as a crosslinking agent that performs crosslinking by the hydrosilyl reaction. That is, by reacting with the hydrosilyl compound, hydrogen gas is generated, and at the same time, the vinyl group in the specific organic polymer compound (component A) and the hydrosilyl group of the crosslinking agent are crosslinked. High foaming is possible without letting off the foamed hydrogen gas. And by the crosslinking by the reaction with the vinyl group, the tack can be reduced without impairing the reduction in hardness. Further, it is preferable to further add a radical polymerization agent to it, since it allows more flexible crosslinking.

  The hydrosilyl compound is not particularly limited as long as it has a hydrosilyl group in the molecule. For example, the hydrosilyl compound preferably has a number of moles of hydrosilyl groups equal to or more than the number of moles of hydroxyl groups in the component A. Specifically, the molar ratio of the hydrosilyl group in the component B to the hydroxyl group in the component A is preferably in the range of hydrosilyl group / hydroxyl group = 1/1 to 10/1, particularly preferably 1/1 to 3/1. It is. That is, if the molar ratio of hydrosilyl groups is less than 1, sufficient foaming ratio may not be obtained. Conversely, if the molar ratio of hydrosilyl group exceeds 10, the strength of the foam is inferior and the amount of hydrosilyl compound increases, so the compatibility with a specific organic polymer compound (component A) decreases and the foamed state This is because the dispersion tends to increase and the storage stability of the compound tends to deteriorate.

  The hydrosilyl group refers to a group in which a hydrogen atom is bonded to at least one of four bonds of a silicon atom.

  Among the hydrosilyl compounds, a modified hydrosilyl compound is preferable from the viewpoint of compatibility with a specific organic polymer compound (component A). Examples of the modified hydrosilyl compound include a phenyl-modified hydrosilyl compound and a styryl-modified hydrosilyl compound.

  The molecular structure of the hydrosilyl compound is not particularly limited, and may be linear, branched, cyclic, or network.

  On the other hand, an isocyanate compound is used as the cross-linking agent that performs cross-linking by the urethane reaction, but in order to obtain cross-linking properties, a radical polymerization agent is used in combination. That is, when a radical polymerization agent is used together with an isocyanate compound, the radical polymerization with respect to the vinyl group in the organic polymer compound (component A) eliminates the increase in hardness seen only during urethane crosslinking, resulting in flexible crosslinking, In addition, tack reduction can be achieved, and the fine cell can be controlled with respect to the expansion ratio.

  The isocyanate compound used for crosslinking by the urethane reaction is not particularly limited as long as it is a polyisocyanate having two or more functions. For example, 4,4′-diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), 4, 4'-dicyclohexylmethane diisocyanate (water-added MDI), trimethylhexamethylene diisocyanate (TMHDI), tolylene diisocyanate (TDI), carbodiimide-modified MDI, polymethylene phenyl polyisocyanate (PAPI), orthotoluidine diisocyanate (TODI), naphthylene diisocyanate (NDI), xylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), paraphenylene diisocyanate (P I), lysine diisocyanate methyl ester (LDI), dimethyl diisocyanate (DDI) and the like. These may be used alone or in combination of two or more. Of these, MDI and TDI are preferably used.

  As the radical polymerization agent used together with the specific organic polymer compound (component A) and the specific cross-linking agent (component B), for example, peroxides (peroxides) and azo compounds are preferably used. Among them, when a silicone group-containing azo compound is used, nitrogen gas resulting from the azo group is foamed and radicals are generated in the remaining part, which reacts with the vinyl group in the polymer, and as a result, the silicone compound is pendant. Thus, the polymer is bonded so as to hang from the main chain of the polymer, so that it is more preferable because it is provided with a flexible crosslink and is provided with a releasing property by silicone and further prevents toner contamination and the like.

  In addition, when bridge | crosslinking by the hydrosilyl reaction mentioned above, in addition to said each component, a foaming agent, a catalyst, a foam stabilizer, a electrically conductive agent, a reinforcing agent, etc. can be mix | blended suitably as needed.

  In addition, in the case of crosslinking by the urethane reaction described above, in addition to the above components, a foaming agent, a catalyst, a foam stabilizer, a conductive agent, a reinforcing agent and the like can be appropriately blended as necessary.

  The foamable polymer composition used in the method for producing a roll for OA equipment of the present invention can be produced, for example, as follows. That is, first, a component such as a catalyst is appropriately added to a specific organic polymer compound (component A) to prepare a liquid main agent, and a specific organic polymer compound (component A) and a specific crosslinking agent (component B) Are mixed in an appropriate ratio, and other components are added as necessary to prepare a liquid crosslinking agent. And in use, it can prepare by mixing the said liquid main ingredient and a liquid crosslinking agent.

  Here, FIG. 1 shows an example of a toner supply roll using the foamable polymer composition. This toner supply roll has a single layer structure in which a foam layer 2 is formed along the outer peripheral surface of the shaft body 1. In the toner supply roll, the foam layer 2 is formed using a special composition (the foamable polymer composition of the present invention).

  The shaft body 1 is not particularly limited, and for example, a metal core made of a metal solid body, a metal cylinder body hollowed out inside, or the like is used. Examples of the material include stainless steel, aluminum, and iron plated.

  As described above, the foam layer 2 formed on the outer peripheral surface of the shaft body 1 is formed using a special composition (the foamable polymer composition of the present invention). That is, the main component is an organic polymer compound (component A) having one or more vinyl groups in one molecule and a polymer having two or more hydroxyl groups as a main component. It is a composition containing a predetermined amount of a crosslinking agent (component B) that causes foaming and at the same time causes a crosslinking reaction to the vinyl group.

  The toner supply roll shown in FIG. 1 can be manufactured by the following method, for example. That is, first, a composition (liquid main agent and liquid cross-linking agent) to be the foam layer 2 forming material is prepared by the same method as described above. Next, the liquid main agent and the liquid cross-linking agent are filled in an injection mold in which a core metal (an adhesive is applied if necessary) that serves as a shaft body, and this is heated to a predetermined temperature (100 ° C. And heating for a predetermined time (about 30 minutes) in an oven. Thereafter, it is removed from the mold, and the outer peripheral surface is polished if necessary to obtain a toner supply roll having a single layer structure in which the foam layer 2 is formed along the outer peripheral surface of the shaft body 1 as shown in FIG. be able to.

  The thickness of the foam layer 2 is usually 2 to 8 mm, preferably 3 to 6 mm.

  Then, by subjecting the surface of the foam layer 2 to corona treatment, plasma treatment or ultraviolet irradiation treatment, radicals can be generated in the added vinyl group, and only the roll surface is selectively modified and crosslinked. Therefore, the conditions for the above-mentioned foam hardening are loosened (approximately 50 ° C. × about 30 minutes), and while maintaining low hardness, the cell diameter near the roll surface is small and tackiness can be reduced.

  The foamable polymer composition used in the production method of the present invention is suitable for the foam layer of the toner supply roll as in the above-mentioned examples, but is not limited to this. The present invention can also be applied to various OA equipment rolls for OA equipment such as developing rolls. In particular, it is preferable to use it for a charging roll because the image improvement effect is remarkable. Further, it is preferable to use it for a toner supply roll or a cleaning roll because its fine cell diameter is excellent in toner transportability and toner cleaning property. The roll for OA equipment of the present invention is not limited to the single layer structure as shown in FIG. 1, and may have a multilayer structure of two or more layers. At that time, when the foamable polymer composition of the present invention is used as the material for the innermost layer, a low compressive stress can be obtained, and it can be processed in a low viscosity state and then polymerized and cured later. The property is also good.

  Next, examples will be described together with experimental examples, comparative experimental examples, and comparative examples.

[Experimental Examples 1-5, Comparative Experimental Example 1]
Each material shown below was prepared, it mix | blended in the ratio shown in Table 1 of the postscript, and these were mixed with the stirrer, and the foaming polymer composition was prepared. The molar ratio [Index (SiH / OH)] between the hydrosilyl group in the crosslinking agent and the hydroxyl group in the polymer is also shown in the same table.

[Vinyl group-containing polyol (i)]
Vinyl group-containing polypropylene glycol (Sanyo Kasei Co., Ltd., Excel Flow FM1001)

[Vinyl group-containing polyol (ii)]
Vinyl group-containing butadiene polyol (made by Idemitsu Oil Co., Polybd)

[Polyol (i)]
Polypropylene glycol (Daiichi Kogyo Seiyaku Co., Ltd., GL3000)

[Hydrosilyl crosslinking agent]
GE Toshiba Silicone, TSF484

[Foaming agent (i)]
Isopropyl alcohol

[Catalyst (i)]
Xylene solution containing 5% platinum catalyst

[Radical polymerization agent (i)]
Dibutyl peroxide

(Radical polymerization agent (ii))
2,2azobisisobutyronitrile

[Radical polymerization agent (iii)]
Silicone group-containing azo compound (WPS Pure Chemicals, VPS1001)

  The foamable polymer compositions of the experimental examples and comparative experimental examples thus obtained were used for foaming and curing under the heat treatment conditions shown in Table 2 below. And according to the following reference | standard, each characteristic was evaluated. These results are also shown in the same table.

[Cell diameter]
A cross-sectional photograph of the foam was taken using an optical microscope, and the average cell diameter was determined.

[1mm compressive stress]
The stress (N / cm ² ) when a 8 mm diameter cylinder was pressed into a foam cut to 30 mm square by 1 mm was measured.

[Foaming ratio]
The weight of the foam cut into 30 mm squares was measured, and volume (cm ³ ) / weight (g) was measured as the expansion ratio.

(Compression set)
The compression set of the foam was measured in accordance with JIS K 6262 under conditions of a temperature of 70 ° C., a test time of 22 hours, and a compression rate of 25%. If this measured value is 5% or less, the compression set is very good, but if it is 8% or less, there is no problem in use.

  That is, from Table 2 above, the foamable polymer composition of the experimental example is finer than the foamable polymer composition of the comparative experimental example, although the foaming ratio is relatively high and the 1 mm compression stress is low. It can be seen that the cell structure is simple. Moreover, it can also be seen that the foamable polymer composition of the experimental example is also excellent in compression set characteristics. That is, it can be seen that the foamable polymer composition of the experimental example has a reduced hardness even if the cell diameter is small.

  Also, using the foamable polymer compositions of the experimental examples and comparative experimental examples thus obtained, rolls for each OA device (toner supply roll, charging roll, cleaning roll) were prepared as shown below. According to each standard, the characteristics of each roll were evaluated. These results are shown in Table 3 below. In addition, the foaming / curing conditions for each composition are in accordance with the heat treatment conditions shown in Table 2 above.

[Toner supply durability]
Each foamable polymer composition is filled into an injection mold in which a core metal (diameter: 10 mm, made of SUS304) is set as a shaft body, and is foamed and cured under predetermined heat treatment conditions. A foam layer (thickness 3 mm) was formed along Next, the surface of this foam layer was polished to prepare a toner supply roll. This toner supply roll was incorporated in a printer (MICROLINE400, manufactured by OKI), and the state of the toner supply roll after printing 5000 sheets was observed. The evaluation was evaluated as ◯ when there was no toner clogging and no influence on the image, and x when there was toner clogging and the density of the solid black image was 1.1 or less in Macbeth density.

(Charging characteristics)
Each foamable polymer composition is filled in an injection mold having a shaft core (diameter 10 mm, made of SUS304), foamed and cured under predetermined heat treatment conditions, and then demolded. Then, a foam layer (thickness 3 mm) was formed along the outer peripheral surface of the shaft body. On the other hand, 100 parts of tetrafluoropropane-vinylidene fluoride copolymer (manufactured by Elf Atchem Japan, Kyner SL) is dissolved in 500 parts of methyl ethyl ketone (MEK), and acetylene black (manufactured by Denki Kagaku Co., Ltd., Denka Black) 5 Parts were dispersed to prepare a surface layer forming material (coating solution). Then, this surface layer forming material is applied to the surface of the foam layer to form a surface layer (thickness 10 μm), a foam layer is formed on the outer peripheral surface of the shaft body, and a surface layer is formed on the surface. Produced. Then, in accordance with the above development characteristics, a halftone image was visually evaluated, and an image having density unevenness due to insufficient charging caused by a dent of the charging roll was evaluated as x and an image having no density unevenness was evaluated as ◯.

[Cleaning characteristics]
Each foamable polymer composition is filled in an injection mold in which a core metal (diameter 10 mm, made of SUS304) as a shaft body is set, foamed and cured under predetermined heat treatment conditions, and then molded. Was polished to prepare a cleaning roll in which a foam layer (thickness 3 mm) was formed along the outer peripheral surface of the shaft body. This cleaning roll was assembled in a commercially available laser beam printer (manufactured by HP, laser jet 4), and the image quality of the image to be imaged after 6000 images were imaged under normal temperature and normal pressure was visually evaluated. Then, there was no problem in the image, and the evaluation was evaluated as “◯” when the Macbeth density was 0.1 or less, and “X” when the Macbeth density exceeded 0.1 (stained background).

[Toner adhesion resistance]
The case where the toner entered the inside of the cell on the roll surface and the toner adhered due to the tackiness of the roll could not be removed was rated as x.

  From the above results, all of the experimental products have a small cell diameter of the foam layer, a low compressive stress, and almost no tackiness, so that the toner supply durability, charging characteristics, cleaning characteristics, toner adhesion resistance It is understood that is superior.

  On the other hand, the comparative experimental example product has a large cell diameter of the foamed layer, so that it is liable to cause clogging of the toner and an adverse effect on the image. As a result, it can be seen that charging characteristics, toner supply durability, cleaning characteristics, and toner adhesion resistance are inferior.

[Example 1, Comparative Example 1]
Each material and water shown below were prepared, blended in the proportions shown in Table 4 below, and mixed with a stirrer to prepare a foamable polymer composition. In addition, the molar ratio [Index (NCO / OH)] of the NCO group in the crosslinking agent and the hydroxyl group in the polymer is also shown in the same table.

[Vinyl group-containing polyol (i)]
Vinyl group-containing polypropylene glycol (Sanyo Kasei Co., Ltd., Excel Flow FM1001)

[Polyol (i)]
Polypropylene glycol (Daiichi Kogyo Seiyaku Co., Ltd., GL3000)

[Polyol (ii)]
POP31-28 manufactured by Mitsui Toatsu Chemical Co., Ltd.

(Catalyst (ii))
Tertiary amine catalyst (manufactured by Kao Corporation, Kaorizer No. 1)

[Catalyst (iii)]
Tertiary amine catalyst (Tosoh Cat HX35, manufactured by Tosoh Corporation)

(Foam stabilizer (ii))
Nippon Unicar Co., Ltd., SZ1313

[Isocyanate (i)]
SUMIDULE 44V20, manufactured by Sumitomo Bayer Urethane Co., Ltd.

[Isocyanate (ii)]
Nippon Soda Co., Ltd., TDI80

[Radical polymerization agent (i)]
Dibutyl peroxide

  The foamable polymer compositions of Examples and Comparative Examples thus obtained were used for foaming and curing under the heat treatment conditions shown in Table 5 below. And evaluation of each characteristic was combined with the same table, and was shown. In addition, evaluation of said each characteristic shall follow the evaluation criteria in the said Experimental Examples 1-5 etc.

  That is, from Table 5 above, the foamable polymer composition of the example has a fine cell structure despite the low 1 mm compressive stress compared to the foamable polymer composition of the comparative example. I understand. That is, it can be seen that the foamable polymer compositions of the examples are reduced in hardness even if the cell diameter is small.

  Further, using the foamable polymer compositions of Examples and Comparative Examples thus obtained, each roll for OA equipment (toner supply roll, charging roll, cleaning roll) was prepared, and according to the respective standards, The characteristics of each roll were evaluated. These results are shown in Table 6 below. In addition, the production method and evaluation criteria of each roll shall be in accordance with the production methods and evaluation criteria in the experimental examples 1 to 5, etc., and the foaming / curing conditions of each composition at the time of production are as described above. It shall conform to the heat treatment conditions shown in Table 5.

  From the above results, the product of Example 1 has a small cell diameter of the foam layer, a low compressive stress, and almost no tackiness, so that it has toner supply durability, charging characteristics, cleaning characteristics, and toner adhesion resistance. It turns out that it is excellent. And in Example 1, although the conditions of the said heat processing are loosened with 50 degreeC x 30 minutes, only the roll surface is selectively modified by plasma processing, and the reduction of tack property is made favorable. Yes.

  On the other hand, the product of Comparative Example 1 has a large cell diameter of the foamed layer, so that clogging of toner and an adverse effect on the image are likely to occur. In addition, the polyol used in the foamed layer material is the same as that of Example 1. Since the polyol used in the invention does not contain a vinyl group, even if the plasma treatment is performed in the same manner as in Example 1, the tackiness is not eliminated, and as a result, charging characteristics, toner supply durability, cleaning It can be seen that the characteristics and toner adhesion resistance are poor.

It is sectional drawing which shows an example of the toner supply roll obtained by the manufacturing method of the roll for OA equipment of this invention.

Claims (10)

A method for producing a roll for OA equipment comprising a shaft body and a foam layer formed on the outer periphery thereof, wherein the foam layer is a foam containing the following (A) as a main component and the following (B). A method for producing a roll for OA equipment, wherein the outer peripheral surface of the layer is modified by corona treatment, plasma treatment, or ultraviolet irradiation treatment after being formed with a conductive polymer composition.
(A) A polymer having one or more vinyl groups and two or more hydroxyl groups in one molecule, or a polymer having one or more vinyl groups and one or more hydroxyl groups in one molecule and 1 A blend polymer with a polymer having two or more hydroxyl groups in the molecule and no vinyl group.
(B) A crosslinking agent that causes foaming in contact with the above (A) and at the same time causes a crosslinking reaction to the vinyl group.   The manufacturing method of the roll for OA equipment of Claim 1 which forms the said foam layer by metal mold | die shaping | molding of the said foamable polymer composition, and performs the said modification process on the outer peripheral surface of the layer.   The method for producing a roll for OA equipment according to claim 2, wherein the mold molding is injection molding.   The manufacturing method of the roll for OA equipment as described in any one of Claims 1-3 in which the crosslinking agent of said (B) uses a radical polymerization agent with an isocyanate compound.   The method for producing a roll for OA equipment according to any one of claims 1 to 3, wherein the crosslinking agent (B) is a hydrosilyl compound.   The manufacturing method of the roll for OA equipment as described in any one of Claims 1-3 in which the crosslinking agent of said (B) uses a radical polymerization agent with a hydrosilyl compound.   The method for producing a roll for OA equipment according to claim 4 or 6, wherein the radical polymerization agent is a peroxide or an azo compound.   The method for producing a roll for OA equipment according to claim 7, wherein the azo compound is a silicone group-containing azo compound.   The roll for OA equipment obtained by the manufacturing method as described in any one of Claims 1-8. The roll for OA equipment according to claim 9, which is used for a toner supply roll, a charging roll or a cleaning roll.

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