JPH09226972A - Elastic roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elastic roller prevented from contamination for a long time. SOLUTION: An elastic roll is made of a thermoplastic material containing a high molecular organic material and a softening agent, JIS A hardness is 0 deg. to 40 deg., compression permanent distortion in 100 deg. is lower than 50%, MFR in 230 deg. is 10g/10min., and a peeling test of 25 deg.C is 300g/25mm or below by JIS K6301 standard. For 100wt.% of a high polymer organic material, 50 to 500wt.% of softening agent is contained and a difference in solution parameter between the high molecular organic material and the softening agent is lower than 3.0, 10 to 250wt.% of polyphenylene ether is contained, the high molecular organic material is a polymer obtained by dipping a copolymer containing polystyrene and polybutadiene blocks and the softening agent is preferably selected from the group consisting of naphthene oil, paraffin oil, polyisobuthelene oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic roll made of a thermoplastic material.
In particular, the present invention relates to a low hardness elastic roll used in electrophotographic devices such as copying machines and printers, electrostatic recording devices, and the like.

[0002]

2. Description of the Related Art Conventionally, elastic rolls used for various purposes have low hardness, have improved flow characteristics, have excellent settling resistance, and are used for suppressing bleeding of blended low-molecular components. Due to various physical properties, there is a strong demand for an elastic roll that is less likely to contaminate an object sandwiched between the rolls even after long-term use (hereinafter simply referred to as "long-term non-contaminating property").

Conventionally, an elastic roll of this type is generally made of a rubber material obtained by filling a rubber composition with oil. It is made of only a rubber material or a rubber material and a rigid body are bonded together. A constructed elastic roll is used.

In order to obtain a rubber material having extremely low hardness by filling this rubber composition with oil, it is necessary to fill a large amount of oil, which has the following drawbacks.

Since the oil is difficult to mix during kneading, the rotor tends to idle. Unvulcanized rubber containing a large amount of oil has strong adhesiveness and is poor in workability because it adheres to a rotor or a kneading machine or strongly adheres to other rolls.

In terms of physical properties, the vulcanized rubber has a large decrease in breaking strength and is easily set. The temperature dependence of the physical properties of the vulcanized rubber increases.

Adhesion with metal is reduced. Furthermore, as an important issue, migration of oil mixed during long-term use (migration to the inside of the rubber composition and the surface of the rubber, etc.)
Occurs and causes a problem in terms of product performance and appearance.
For example, when it is used for a paper feed roll, there is a defect that the paper is contaminated if it is used for a long time.

For this reason, there is a limit to reducing the hardness of a general rubber material by filling with oil. Therefore, in order to obtain a low hardness rubber material without the above-mentioned defects, a special rubber (for example, silicone gel) is used. , Polynorbornene, etc.) is required. However, these require special manufacturing methods and are not advantageous for practical use.

The reason why the long-term non-staining property of conventional materials is not sufficient as described above is considered to be due to the fact that the above-mentioned various physical properties of the material lack a balance at a high level and are not satisfied. .

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above facts, and has a low hardness as a material, a low compression set at high temperature (excellent in settling resistance), and a blended low molecular weight compound. An object of the present invention is to provide an elastic roll having improved processability and excellent long-term non-staining property by using a component capable of suppressing bleeding.

[0011]

The elastic roll of the present invention comprises:
An elastic roll made of a thermoplastic material containing a high molecular weight organic material and a softening agent, and having a hardness of JIS K6301 standard A.
The scale is 0 ° to 40 °, the compression set at 100 ° C. is 50% or less according to JIS K6301, the MFR at 230 ° C. is 10 g / 10 minutes or more according to JIS K7210 standard, and the peeling at 25 ° C. The test is 300 g / with the standard according to JIS K6301.
It is characterized by being 25 mm or less.

The thermoplastic material contains 100 parts by weight of a high molecular weight organic material and 50 to 500 parts by weight of a softening agent, and the difference in solubility parameter between the high molecular weight organic material and the softening agent is 3.0. The following is preferable.

The thermoplastic material preferably comprises 10 to 250 parts by weight of polyphenylene ether.

The polymer organic material used in the elastic roll of the present invention comprises at least one polymer block containing a vinyl aromatic compound as a main component and at least one polymer block containing a conjugated diene compound as a main component. A hydrogenated block copolymer obtained by hydrogenating a block copolymer, having an average molecular weight of 150,000 to 400,000.
It is characterized by being 0.

Further, the softening agent is one or more selected from naphthene-based oils, paraffin-based oils and polyisobutylene-based oils, and its average molecular weight is 450 to 5,000. .

In the elastic roll of the present invention, a low hardness material is obtained by combining a high molecular weight organic material and a softening agent, and the shape following property and the adhesion are excellent, and the high molecular weight organic material and the softening agent are used. The solubility parameter difference between
By the following, the compatibility of the materials is improved, the bleeding of low molecular weight components can be prevented, and the compression set is small, so that there is little settling or the like even after long-term use.

Further, since this thermoplastic material has a good releasability, even if it is formed into a sheet and then laminated and stored, the materials do not stick to each other and can be peeled off smoothly, so that it can be stored. Even after that, the productivity of the elastic roll does not decrease.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

In the present invention, the high molecular weight organic material has a number average molecular weight of 20,000 or more, particularly 30,0.
00 or more, especially 40,000 or more of thermoplastic polymer organic materials are preferable, and for example, various thermoplastic elastomers such as styrene (butadiene styrene, isoprene styrene, etc.), ester, amide, urethane, etc., and Hydrogenated or other modified products thereof, styrene type, ABS type, olefin type (ethylene type, propylene type, ethylene propylene type, ethylene styrene type, propylene styrene type, etc.), vinyl chloride type, acrylic acid ester type (acrylic acid Methyl type, etc., Methacrylic acid ester type (methyl methacrylate type, etc.) Carbonate type, acetal type, nylon type, halogenated polyether type (chlorinated polyether type, etc.), halogenated olefin type (tetrafluoroethylene type, Fluorinated-ethylene chloride type, fluorinated ethylene Propylene type), cellulose type (acetyl cellulose type, ethyl cellulose type, etc.), vinylidene type, vinyl butyral type, alkylene oxide type (propylene oxide type, etc.) and other thermoplastic resins, and rubber modified products of these resins, etc. To be

As a specific example of the thermoplastic polymer organic material, a material having a hard block such as a crystal structure or an agglomerate structure and a soft block such as an amorphous structure together is particularly preferable. Preferably, specifically, the following are mentioned.

A block copolymer of crystalline polyethylene obtained by hydrogenating a block copolymer of polybutadiene and a butadiene-styrene random copolymer, and an ethylene / butylene-styrene random copolymer.

Obtained by hydrogenating a block copolymer of polybutadiene and polystyrene, or a block copolymer of polybutadiene or an ethylene-butadiene random copolymer and polystyrene, for example, diethylene of crystalline polyethylene and polystyrene Among them, block copolymers, styrene-ethylene / butylene-styrene triblock copolymers, and the like, among them, styrene-ethylene / butylene-styrene block copolymers.

A block copolymer in which crystalline polyethylene is linked to one end or both ends of an ethylene / butylene copolymer.

Ethylene-propylene rubber. Among these, obtained by hydrogenating a block copolymer, which is specifically mentioned, consisting of at least one polymer block mainly containing a vinyl aromatic compound and at least one polymer block mainly containing a conjugated diene compound. Hydrogenated block copolymer having an average molecular weight of 150,00
It is preferably from 0 to 400,000. That is,
A block copolymer composed of at least one polymer block mainly containing a vinyl aromatic compound (1 segment) and at least one polymer block mainly containing a conjugated diene compound (1 segment) is hydrogenated. The block copolymer having at least two polymer blocks containing a vinyl aromatic compound as a main component and at least one polymer block containing a conjugated diene compound as a main component (for example, styrene-butadiene) is preferable. Hydrogenated block copolymers obtained by hydrogenating styrene block copolymers) are more preferable. The hydrogenated block copolymer represented by this styrene-ethylene / butylene-styrene block copolymer has an average molecular weight of 15
When it is less than 10,000, the compression set is deteriorated and the sustainability of the long-term non-staining effect is lowered, and when it exceeds 400,000, the fluidity of the material is lowered and the moldability is deteriorated, so that the average molecular weight is The above range is preferable.

The content of the amorphous styrene block in the block copolymer is 10 to 70% by weight, preferably 15
It is desirable that the amount is in the range of -60% by weight. The glass transition temperature (Tg) of the amorphous styrene block part is 60 ° C.
The temperature is preferably 80 ° C. or higher. Further, the polymer of the portion connecting the amorphous styrene blocks at both ends is also preferably an amorphous one, and examples thereof include an ethylene-butylene copolymer, a butadiene polymer, and an isoprene polymer. It may be a block or random copolymer of these.

These various thermoplastic polymer organic materials are mainly used alone, but two or more kinds may be blended and used.

As the softening agent used in the present invention, it is preferable to use a low molecular weight material having a number average molecular weight of less than 20,000. Physically, the viscosity at 100 ° C. is 5 × 10 ⁵ centipoise. Below, in particular, 1 × 10
It is preferably ⁵ centipoise or less, and from the viewpoint of molecular weight, the number average molecular weight is preferably less than 20,000, especially 10,000 or less, particularly preferably 5,000 or less. As such a softening agent, usually, a liquid or liquid material at room temperature is preferably used. Further, either a hydrophilic or hydrophobic softener can be used. The softener is not particularly limited, but the following are suitable. This softening agent includes various types of rubber or resin softening agents such as mineral oil type, vegetable oil type and synthetic type. Examples of the mineral oil-based oil include process oils such as naphthene-based oil and paraffin-based oil. Vegetable oils include castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, coconut oil, peanut oil,
Examples include wood wax, pine oil and olive oil.
Among them, one or more selected from mineral oil-based paraffinic oils, naphthene-based oils, and polyisobutylene-based oils, having an average molecular weight of 4
It is preferably from 50 to 5,000. In the oil preferably used as the softening agent, if the average molecular weight is less than 450, the compression set deteriorates and the persistence of the non-staining effect decreases, and if it exceeds 5,000, the surface of the elastic roll obtained becomes sticky. Therefore, the average molecular weight is preferably within the above range.

These softening agents may be used alone or in combination of two or more as long as they have a good compatibility with each other.

The blending amount of these softening agents is 50 to 500 parts by weight, preferably 50 to 300 parts by weight, based on 100 parts by weight of the high molecular weight organic material. The amount is 5
If it is less than 0 parts by weight, a sufficiently low hardness cannot be achieved, and the flexibility of the material becomes insufficient, and if it exceeds 500 parts by weight, bleeding of the softening agent tends to occur, and the mechanical strength of the material is Any of them is not preferable from the viewpoint of long-term non-polluting effect.

In order for the elastic roll of the present invention to exhibit preferable flexibility, vibration damping property and durability, the physical properties are such that the hardness is 0 ° to 40 ° on the JIS K6301 standard A scale.
And the compression set at 100 ° C. is JIS K6.
It is less than 50% in 301 standard, and MF at 230 ℃
R is 10 g / 10 minutes or more according to JIS K7210 standard, and the peeling test at 25 ° C. is JIS K630.
It is required to be 300 g / 25 mm or less in the standard according to 1.

The hardness of the elastic roll of the present invention is JIS K6.
If it exceeds 40 ° on the 301 standard A scale, the hardness of the material becomes high and the effect cannot be obtained, and if the compression set at 100 ° C exceeds 50% according to JIS K6301, the material deforms over time and long-term non-contamination occurs. May decrease
MFR at 230 ° C is 1 according to JIS K7210 standard
It is less than 0g / 10 minutes, and the peeling test at 25 ° C is 300g / 25m according to the standard according to JIS K6301.
If it exceeds m, the workability is deteriorated and the productivity is deteriorated.

The test methods for these physical properties are all JIS
It can be measured according to the K6301 standard,
That the peeling test at 25 ° C. conforms to JIS K6301 means that the peeling test is performed by a method using a strip-shaped test piece that tests the strength of adhesion in JIS K6301 “7. Peeling test”. Yes, but J
In addition to the conditions described in IS K6301, (1) the size of the test piece is 25 mm width, 90 mm length, and 2 mm thickness.
(2) Before attaching the test pieces, before putting the two test pieces between the release paper and putting them in a 40 ° C oven with a load of 100 g / cm ² applied from the top for 22 hours. (3) Move the test piece gripper to a moving speed of 500
It is evaluated by using the measured value of the peeling test with the condition of mm / min added. By this peeling test, it can be confirmed that the sheets of the thermoplastic material for elastic rolls are stored in a laminated state and can be easily peeled off without sticking between the sheets even when left at high temperature.

In order to have the above-mentioned properties, the polymer organic material constituting the thermoplastic material in the present invention preferably has a three-dimensional continuous network skeleton structure, and the formed three-dimensional continuous network skeleton structure. Has an average diameter of its skeleton of 5
0 μm or less, preferably 30 μm or less, the average diameter of the cells (mesh) is 500 μm or less, preferably 300 μm or less, and the volume fraction of the high-molecular organic material is [volume of high-molecular organic material / (volume of high-molecular organic material) (Volume + volume of softener)] ×
When defined as 100 (%), the volume fraction of the high molecular weight organic material is preferably 50% or less, particularly preferably 33% or less.

Further, in order to obtain an elastic roll made of a thermoplastic material containing a large amount of a softening agent and a smaller amount of a polymeric organic material, the solubility parameter value δ = (ΔE of each of the softening agent and the polymeric organic material used. It is preferable to select both materials so that the difference of / V) ^1/2 (ΔE = molar evaporation energy, V = mol volume) is 3.0 or less, preferably 2.5 or less. If this difference exceeds 3.0, from the viewpoint of the compatibility of both materials, it is difficult to retain a large amount of the softening agent, which is an obstacle to lowering the elasticity of the obtained thermoplastic material, and bleeding of the softening agent is likely to occur. Therefore, the long-term non-polluting property may decrease, which is not preferable.

Further, the elastic roll of the present invention may be blended with a polyphenylene ether resin for the purpose of improving the compression set of the material, sustaining the non-contaminating effect, and improving the durability of the elastic roll. The polyphenylene ether resin used here is a homopolymer composed of a bonding unit represented by the following formula or a copolymer containing the bonding unit.

[0036]

Embedded image

In the formula, R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a halogen atom or a hydrocarbon group.

As the polyphenylene ether resin, known resins can be used, and specifically, for example, poly (2,2)
6-dimethyl-1,4-phenylene ether), poly (2-methyl-6-ethyl-1,4-phenylene ether), poly (2,6-diphenyl-1,4-phenylene ether), poly (2- Methyl-6-phenylene-1,
4-phenylene ether), poly (2,6-dichloro-)
1,4-phenylene ether) and the like.
A polyphenylene ether copolymer such as a copolymer of 2,6-dimethylphenol and a monovalent phenol (for example, 2,3,6-trimethylphenol or 2-methyl-6-butylphenol) can also be used. Among them, poly (2,6-dimethyl-1,4-phenylene ether) and a copolymer of 2,6-dimethylphenol and 2,3,6-trimethylphenol are preferable, and further,
Poly (2,6-dimethyl-1,4-phenylene ether) is preferred.

The amount of the polyphenylene ether resin compounded is
It can be suitably selected within the range of 10 to 250 parts by weight with respect to the thermoplastic material. If the amount exceeds 250 parts by weight, the hardness of the thermoplastic material becomes high, the flexibility may be lost, and the long-term non-staining property may decrease. If the amount is less than 10 parts by weight, the improvement effect obtained by compounding is insufficient. , Neither is preferable.

The elastic roll according to the present invention may further contain the following fillers, if necessary.
In other words, clay, diatomaceous earth, silica, talc, barium sulfate, calcium carbonate, magnesium carbonate, metal oxide, mica, graphite, flaky inorganic fillers such as aluminum hydroxide, various metal powders, wood chips, glass powder, ceramics Granular or powdery solid fillers such as powder, granular or powdery polymer, and other various natural or artificial short fibers and long fibers (eg, straw, wool, glass fiber, metal fiber, various other polymer fibers, etc.) Can be blended.

Further, it is possible to reduce the weight by blending a hollow filler, for example, an inorganic hollow filler such as a glass balloon or a silica balloon, an organic hollow filler made of polyvinylidene fluoride or a polyvinylidene fluoride copolymer. Furthermore, it is also possible to mix various foaming agents to improve various physical properties such as weight reduction.
It is also possible to mechanically mix gas during mixing or the like.

In the elastic roll of the present invention, in addition to the above-mentioned components, known resin components and additives may be used in combination in order to improve various properties.

As the resin component, for example, a polyolefin resin or a polystyrene resin can be used in combination. By adding these, the workability of the elastic roll,
The heat resistance can be improved. Examples of the polyolefin resin include polyethylene, isotactic polypropylene, and a copolymer of propylene with a small amount of other α-olefin (eg, a propylene-ethylene copolymer and a propylene / 4-methyl-1pentene copolymer). ,
Examples thereof include poly (4-methyl-1pentene) and polybutene-1. When isotactic polypropylene or its copolymer is used as the polyolefin resin, its MFR (JIS K7210) is 0.1 to 5
A range of 0 g / 10 min, particularly 0.5 to 30 g / 10 min can be suitably used.

As the polystyrene resin, those obtained by the radical polymerization method or the ionic polymerization method can be preferably used as long as they are obtained by a known production method. The number average molecular weight of the polystyrene resin is 5,000-5
00,000, preferably 10,000-200,00
0 and a molecular weight distribution [ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) (Mw / M
n)] is preferably 5 or less.

Examples of the styrene resin include polystyrene and styrene having a styrene content of 60% by weight or more.
Butadiene block copolymer, rubber reinforced polystyrene,
Examples thereof include poly α-methyl styrene and poly p-tertiary butyl styrene, and these may be used alone or in combination of two or more. Further, a copolymer obtained by polymerizing a mixture of monomers constituting these polymers can also be used.

The polyolefin resin and polystyrene resin may be used in combination. When these resins are added to the elastic roll of the present invention, the hardness of the obtained material tends to be higher when the polystyrene resin is used in combination as compared with the case where only the polyolefin resin is added. Therefore, the hardness of the obtained elastic roll can be adjusted by selecting these compounding ratios. In this case, the ratio of polyolefin resin / polystyrene resin is 9
It is preferable to select from the range of 5/5 to 5/95 (weight ratio).

When these resin components are used in combination, they should be used within a range that does not impair the effects of the present invention, and the compounding amount is 0 to 100 relative to 100 parts by weight of the polymer organic material.
It is preferred that the amount is about parts by weight. If the blending amount of the resin component exceeds 100 parts by weight, the hardness of the elastic roll obtained becomes too high and the flexibility is lost, which is not preferable.

As other additives, if necessary,
Flame retardant, antibacterial agent, hindered amine light stabilizer, ultraviolet absorber, antioxidant, inorganic filler, colorant, silicone oil, coumarone resin, coumarone-indene resin, phenol terpene resin, petroleum hydrocarbon, rosin derivative, etc. Various tackifiers (Tackifier), various adhesives such as Rheostomer (trade name: manufactured by Riken Vinyl Co., Ltd.), Hibler (trade name: manufactured by Kuraray Co., Ltd., a block in which polystyrene blocks are connected to both ends of a vinyl-polyisoprene block) A thermoplastic elastomer or resin such as a copolymer) or Nosolex (trade name: polynorbornene obtained by ring-opening polymerization of norbornene manufactured by Nippon Zeon Co., Ltd.) can be used in combination.

The method for producing the elastic roll of the present invention is not particularly limited, and known methods can be applied. For example, the above-mentioned materials and, if desired, additive components are melt-kneaded using a heat kneader, for example, a single-screw extruder, a twin-screw extruder, a roll, a Banbury mixer, a Brabender, a kneader, a high-shear mixer, or the like. Further, if desired, a cross-linking agent such as an organic peroxide, a cross-linking aid, or the like is added, or these necessary components are mixed at the same time, and the mixture is heated and melt-kneaded, so that it can be easily produced.

Further, a thermoplastic material prepared by kneading a high molecular weight organic material and a softening agent is prepared in advance, and this material is used as one or more high molecular weight organic materials of the same kind or different kinds from those used here. It can be manufactured by further mixing.

In the elastic roll of the present invention, it is also possible to add a crosslinking agent such as an organic peroxide, a crosslinking aid and the like to perform crosslinking.

Here, as the cross-linking agent which can be added for the partial cross-linking, organic peroxide is preferably mentioned, and specifically, for example, 2,5-dimethyl-2,5-di (t
-Butylperoxy) -hexane, 2,5-dimethyl-
2,5-di (benzoylperoxy) -hexane, t-
Butyl peroxybenzoate, dicumyl peroxide, t-butyl cumyl peroxide, diisopropyl benzohydroperoxide, 1,3-bis- (t-
Butylperoxyisopropyl) -benzene, benzoyl peroxide, 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane and the like, and useful crosslinking aids include, for example, Divinylbenzene, trimethylolpropane triacrylate, ethylene dimethacrylate, diallyl phthalate,
Examples include quinone dioxime, phenylene bismaleimide, polyethylene glycol dimethacrylate, and unsaturated silane compounds. These organic peroxides and crosslinking aids are used in an amount of 0.1% based on 100 parts by weight of the whole compounding material.
The degree of crosslinking can be adjusted arbitrarily in the range of 1 to 5 parts by weight. These organic peroxides and crosslinking assistants can be used in combination of two or more, if necessary. When an unsaturated silane compound is used as a crosslinking aid, crosslinking can be further advanced by contact with moisture in the presence of a silanol condensation catalyst.

The elastic roll of the present invention thus obtained is
It can be used by molding it into a desired shape by a known method, for example, injection molding.

The elastic roll of the present invention is used for all purposes requiring long-term non-polluting property, for example, electrophotographic devices such as copying machines and printers, electrostatic recording devices, OA equipment such as facsimiles and document feeding devices, and automatic cash transactions. It is preferably used as an elastic roll for a device (ATM), a money changer, a counter, a vending machine, a cash dispenser (CD), and the like.

[0055]

The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples.

The physical properties of these examples were evaluated by the following methods. (1) Hardness of material The test method was based on JIS K6301 A type evaluation method.

(2) Compression set Strain resistance is an index of settling resistance and was evaluated according to JIS K6301 by strain residual ratio after 25% deformation at 100 ° C. for 22 hours.

(3) MFR Evaluation was carried out at 230 ° C. in accordance with the flow test method for thermoplastics of JIS K7210.

(4) Peel Test JIS K6301 7. Tanzan in peel test
The size of the test piece can be changed according to the method using the test piece.
25 mm, length 90 mm, thickness 2 mm, test piece collection
Before attaching, place the two test pieces between the release paper and
00g / cm ^TwoIn an oven at 40 ℃ with the load of
After the pretreatment of putting in and leaving for 22 hours, test
The moving speed of one grip was evaluated as 500 mm / min.

The solubility parameter is measured by a conventional method, and the number average molecular weight is measured by gel permeation chromatography [GPC; Tosoh GMH-XL (2
Main series)] and using the differential refractive index (RI),
It was carried out in terms of polystyrene using monodisperse polystyrene as a standard. (Example 1) (1) Preparation of elastic roll A thermoplastic material for an elastic roll was prepared using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softener: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 170 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 10 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 13.1 parts by weight (iso Tactic polypropylene M-1300, manufactured by Asahi Polypro) Higher fatty acid amide 3.0 parts by weight (Armoslip E, manufactured by Lion) The above raw materials were well mixed with a Henschel mixer, and the mixture was a twin screw extruder with a diameter of 50 mm. Melt-kneaded at 240 ° C. to obtain thermoplastic material pellets.

The hardness of this thermoplastic material is 0 ° according to JIS-A, the compression set is 45%, the MFR is 300 g / min,
The peel test result was 50 g / 25 mm. (2) Preparation and Evaluation of Elastic Roll for Printer The obtained thermoplastic material was poured into a roll-shaped mold to prepare an elastic roll for printer. When this roll was actually used, it could be used satisfactorily for a long period of time without contaminating the material sandwiched between the rolls. (Example 2) (1) Preparation of elastic roll A thermoplastic material for an elastic roll was prepared in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softener: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 10 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 13.1 parts by weight (iso Tactic polypropylene M-1300, manufactured by Asahi Polypro) The hardness of this thermoplastic material was 10 ° according to JIS-A, the compression set was 30%, the MFR was 119 g / min, and the peel test result was 38 g / 25 mm. . (2) Preparation and Evaluation of Elastic Roll for Printer An elastic roll for printer was prepared and evaluated using the obtained thermoplastic material in the same manner as in Example 1,
Similar to Example 1, it showed excellent long-term non-staining property. Comparative Example 1 (1) Preparation of Elastic Roll A thermoplastic material for elastic roll was prepared in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 30,000, SP value 8.5) Softening agent: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 750, SP value 7.8) Polyphenylene ether resin 15 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 12 parts by weight (isotactic) Polypropylene M-1300, manufactured by Asahi Polypro) The hardness of this thermoplastic material was 5 ° in JIS-A, the compression set was 90%, the MFR was 300 g / min, and the peel test result was 100 g / 25 mm. (2) Preparation and Evaluation of Elastic Roll for Printer An elastic roll for printer was prepared and evaluated using the obtained thermoplastic material in the same manner as in Example 1,
Paper feeding became impossible in a short time. It is considered that this is because the paper could not be effectively delivered due to the deformation of the roll. Comparative Example 2 (1) Preparation of Elastic Roll A thermoplastic material for elastic roll was prepared in the same manner as in Example 1 using the following raw materials.

Polymer organic material 100 parts by weight (styrene-ethylene / butylene-styrene block copolymer: molecular weight 200,000, SP value 8.5) Softening agent: paraffin oil 58 parts by weight (molecular weight 1,500, SP value 7.8 ) Softener: Paraffin oil 73 parts by weight (molecular weight 400, SP value 7.8) Polyphenylene ether resin 15 parts by weight [Poly (2,6-dimethyl-1,4-phenylene ether)] Polypropylene resin 12 parts by weight (isotactic) Polypropylene M-1300, manufactured by Asahi Polypro) The hardness of this thermoplastic material was 8 ° in JIS-A, the compression set was 100%, the MFR was 200 g / min, and the peel test result was 35 g / 25 mm. (2) Preparation and Evaluation of Elastic Roll for Printer An elastic roll for printer was prepared and evaluated using the obtained thermoplastic material in the same manner as in Example 1,
As in Comparative Example 1, paper feeding was impossible in a short time. It is considered that this is because the paper could not be effectively delivered due to the deformation of the roll.

As is clear from the above examples, the elastic roll of the present invention has a low hardness, a low compression set at high temperature (excellent in settling resistance), and suppresses bleeding of low molecular weight materials. Therefore, it can be seen that excellent long-term non-staining property is exhibited.

On the other hand, Comparative Example 1 obtained by using a high molecular organic material of a hydrogenated block copolymer having a low molecular weight and Comparative Example 2 obtained by using a low molecular weight paraffinic oil as a softening agent to be added are It can be seen that, although all have low hardness, the compression set is high and the long-term non-staining property is deteriorated.

[0068]

As described above, the elastic roll of the present invention uses a material having a low hardness, a low compression set at a high temperature, a good fluidity, and a bleeding property of a low molecular weight material. Therefore, the workability is improved and the long-term non-polluting property is improved, which is an excellent effect.

Claims (5)

[Claims] 1. An elastic roll made of a thermoplastic material containing a high molecular weight organic material and a softening agent, the hardness of which is JIS K.
6301 standard A scale, 0 ° to 40 °, 100
Compression set at 5 ° C is 5 according to JIS K6301 standard
0% or less, MFR at 230 ° C is JIS K
7210 standard, 10 g / 10 minutes or more, and 25
An elastic roll having a peeling test at 300C of 300 g / 25 mm or less according to JIS K6301. 2. The thermoplastic material is a high molecular weight organic material 1.
100 parts by weight and 50 to 500 parts by weight of a softening agent are included, and the difference in solubility parameter between each of the high molecular weight organic material and the softening agent is 3.0 or less. Elastic roll. 3. The elastic roll according to claim 1, wherein the thermoplastic material contains 10 to 250 parts by weight of polyphenylene ether. 4. The polymer organic material comprises at least one polymer block containing a vinyl aromatic compound as a main component,
A hydrogenated block copolymer obtained by hydrogenating a block copolymer composed of at least one polymer block mainly composed of a conjugated diene compound, having an average molecular weight of 15
The elastic roll according to any one of claims 1 to 3, wherein the elastic roll has a size of 10,000 to 400,000. 5. The softening agent is one or more selected from naphthenic oils, paraffinic oils and polyisobutylene oils, and has an average molecular weight of 45.
It is 0-5,000, It is characterized by the above-mentioned.
Elastic roll as described.