JP5125034B2 - Composition for conductive roll - Google Patents

Description

  The present invention relates to a polyether polymer used for water-swellable rubbers, conductive rolls, and the like, and more specifically, molding having excellent molding processability, good surface smoothness, and small variation in volume resistivity. The present invention relates to a polyether polymer that can provide a body.

  The polyether polymer is a polymer obtained by (co) polymerizing monomers such as ethylene oxide and propylene oxide. This polyether polymer is used for conductive materials (Patent Document 1), adhesives and coating agents, water-absorbing materials and water-swellable materials (Patent Documents 2 and 3) used in copying machines and printing machines. It's being used.

  As a polyether polymer applied to such a use, Patent Document 3 discloses that a polystyrene-reduced weight average molecular weight (Mw) by a gel permeation method using dimethylformamide as a solvent is 100,000 to 1,500,000, and a molecular weight distribution. More preferably, a polyether polymer having an index Mw / Mn (where Mn is a number average molecular weight) of 1.5 to 13 is disclosed.

JP 2001-139795 A JP-A-4-372651 JP 2006-28454 A

  However, conventional polyether polymers have low mold releasability and difficulty in moldability. Further, even if an additive is blended with a conventional polyether polymer, it is difficult to uniformly disperse, for example, there may be a large variation in the specific electrical resistance value, and the smoothness of the surface of the molded product may not be sufficient. there were.

  An object of the present invention is to provide a polyether polymer that can provide a molded article having excellent molding processability, good surface smoothness, and small variation in volume resistivity.

  The inventors first noticed that the conventional polyether polymer has a wide molecular weight distribution. And as a result of intensive studies on the molecular weight distribution of the polyether polymer, the present inventors have used a polymerization catalyst composed of organoaluminum, phosphoric acid, and an organophosphorus compound, organoaluminum for oxirane monomers, phosphoric acid, And the amount of the organophosphorus compound in a specific ratio, it was found that a polyether polymer having a content of a polymer component having a molecular weight of 3 times or more of the weight average molecular weight reduced to a specific value or less can be obtained. .

  Further, the present inventors have found that the polyether polymer is excellent in molding processability and gives an extruded product having good surface smoothness, and a polyether polymer in which a nitrile rubber and a filler are blended with the polyether polymer. It has been found that the combined composition has a small variation in the volume resistivity value. Furthermore, it has been found that a polyether polymer containing phosphorus and aluminum in a specific ratio is suitable for a conductive roll or the like. The present invention has been further studied and completed based on these findings.

That is, the present invention includes the following.
(1) A polyether polymer having a weight average molecular weight of 50,000 or more and 1,000,000 or less, and a content of a polymer component having a molecular weight of 3 or more times the value of the weight average molecular weight is 15% by weight or less.
(2) It contains phosphorus and aluminum, the phosphorus content is 0.10 to 0.32% by weight, and the weight ratio of phosphorus to aluminum (P / Al) is 0.2 to 1.1 ( The polyether polymer as described in 1).
(3) (1) or (2) comprising 80 to 98 mol% of ethylene oxide monomer units (A) and 2 to 20 mol% of other oxirane monomer units (B) copolymerizable with ethylene oxide monomers ).
(4) The polyether polymer according to (3), wherein the oxirane monomer unit (B) comprises at least one of an allyl glycidyl ether monomer unit and an epichlorohydrin monomer unit.

(5) A method for producing a polyether polymer in which an oxirane monomer is subjected to ring-opening polymerization in the presence of a polymerization catalyst obtained by reacting organoaluminum with phosphoric acid and adding an organophosphorus compound thereto,
It is characterized in that it is used at a ratio of 3.0 to 15.0 mmol of organoaluminum, 0.3 to 3.5 mmol of phosphoric acid, and 0.3 to 6.0 mmol of organophosphorus compound with respect to 100 g of the monomer. A method for producing a polyether polymer.

(6) A polyether polymer composition containing the polyether polymer according to any one of (1) to (4) and a filler.
(7) A water-swellable composition containing the polyether polymer according to any one of (1) to (4) and a filler.

(8) A polyether polymer composition comprising the polyether polymer according to any one of (1) to (4), a nitrile rubber, and a filler.
(9) The composition for electroconductive rolls containing the polyether polymer in any one of said (1)-(4), a nitrile rubber, and a filler.

By the production method of the present invention, a polyether polymer in which the content of the polymer component having a molecular weight of 3 times or more of the weight average molecular weight is reduced to a specific value or less although it has a large weight average molecular weight can be easily obtained.
The polyether polymer of the present invention is excellent in processability at the time of extrusion molding, and can provide a molded article having good surface smoothness.
The water-swellable composition comprising the polyether polymer and filler of the present invention is excellent in molding processability and excellent in the surface state and adhesiveness after water swelling.
Furthermore, the composition for conductive rolls comprising the polyether polymer, nitrile rubber and filler of the present invention can provide a molded product having small variations in volume resistivity value.
Since the polyether polymer of the present invention has the above-mentioned effects, it can be used for conductive materials, adhesives and coating agents, water-absorbing materials, water-swellable materials and the like used in copying machines and printing machines. can do.

(Polyether polymer)
The polyether polymer of the present invention has a weight average molecular weight (Mw) of 50,000 to 1,000,000, preferably 70,000 to 700,000, more preferably 80,000 to 500,000. If the weight average molecular weight is small, the strength of the molded product is insufficient, and conversely if the weight average molecular weight is large, the melt viscosity increases, making molding difficult. The molecular weight of the polyether polymer is a value of the molecular weight of each polymer component constituting the polyether polymer, measured as a standard polystyrene conversion value by gel permeation chromatography, and weight average molecular weight by weighting these. (Mw) is required.

  In the polyether polymer of the present invention, the content of a polymer component having a molecular weight of 3 times or more of the value of the weight average molecular weight (Mw) (hereinafter sometimes simply referred to as “high molecular weight component”) is 15 wt. % Or less, preferably 10% by weight or less, more preferably 5% by weight or less. When the content of the high molecular weight component is large, the pressure at the time of extrusion molding becomes too high, the molding processability is lowered, and the surface smoothness of the extruded product is lowered.

  The polyether polymer of the present invention is not particularly limited by the content of the low molecular weight component, but the content of the polymer component having a molecular weight equal to or less than 1/3 times the value of the weight average molecular weight (hereinafter simply referred to as “low molecular weight component”). Is preferably 20% by weight or less, and more preferably 15% by weight or less. When the content of the low molecular weight component is within the above range, the adhesiveness of the polymer can be lowered, and it becomes difficult to adhere when a water-swellable composition is obtained.

The polyether polymer of the present invention preferably contains phosphorus and aluminum. A polyether polymer containing a predetermined amount of phosphorus and aluminum is less likely to cause polymer cutting during kneading.
The phosphorus content is preferably 0.10 to 0.32% by weight, more preferably 0.11 to 0.28% by weight, and still more preferably 0.12 to 0.25% by weight. When the content of phosphorus is within the above range, it is difficult to contaminate the photoreceptor in contact with the conductive roll.
The weight ratio of phosphorus to aluminum (P / Al) is preferably 0.2 to 1.1, more preferably 0.3 to 1.0, and still more preferably 0.4 to 0.90. . When the weight ratio of phosphorus to aluminum is in the above range, workability is excellent.

  The polyether polymer of the present invention is not particularly limited as long as it has an oxyalkylene repeating unit as a main structural unit. The oxyalkylene repeating unit is formed by ring-opening polymerization of an oxirane monomer.

  The oxirane monomer used for constituting the polyether polymer of the present invention is not particularly limited, but the polyether polymer of the present invention preferably has an ethylene oxide monomer unit (A) as a main repeating unit. These may be composed of only the ethylene oxide monomer unit (A) or may be composed of the ethylene oxide monomer unit (A) and another oxirane monomer unit (B) copolymerizable with the ethylene oxide monomer. In the polyether polymer of the present invention, the ethylene oxide monomer unit (A) is preferably 80 to 98 mol%, more preferably 82 to 97 mol%, still more preferably 83 to 96, in all the repeating units of the polymer. It is contained in a mol%, most preferably 85 to 95 mol%.

  When the content of the ethylene oxide monomer unit (A) is in the above range, the moldability becomes better and the mechanical strength is also increased. In this case, the content of the other oxirane monomer unit (B) copolymerizable with the ethylene oxide monomer is preferably 2 to 20 mol%, more preferably 3 to 18 mol%, and further preferably 4 to 17 mol%. Mol%, most preferably 5 to 15 mol%. The total of the ethylene oxide monomer unit (A) and the other oxirane monomer unit (B) copolymerizable with the ethylene oxide monomer is 100 mol%.

  The other oxirane monomer (b) copolymerizable with the ethylene oxide monomer (a), which is a constituent component of the oxirane monomer unit (B), includes an alkylene oxide having 3 to 20 carbon atoms, a carbon number 1-10 glycidyl ether, a vinyl compound oxide, etc. are mentioned.

  Examples of the alkylene oxide having 3 to 20 carbon atoms include propylene oxide, 1,2-epoxybutane, 1,2-epoxy-isobutane, 2,3-epoxybutane, 1,2-epoxyhexane, 1,2-epoxyoctane, Chain alkylene oxides such as 1,2-epoxydecane, 1,2-epoxytetradecane, 1,2-epoxyhexadecane, 1,2-epoxyoctadecane, 1,2-epoxyeicosane; 1,2-epoxycyclopentane, And cycloalkylene oxides such as 1,2-epoxycyclohexane and 1,2-epoxycyclododecane;

  Examples of the glycidyl ether having 1 to 10 carbon atoms include alkyl glycidyl ethers such as methyl glycidyl ether, ethyl glycidyl ether, and butyl glycidyl ether; aryl glycidyl ethers such as phenyl glycidyl ether;

Examples of the vinyl compound oxide include styrene oxide.
Among these, chain alkylene oxide is preferable, and propylene oxide and 1,2-epoxybutane having high polymerization reactivity are most preferable.

The oxirane monomer (b) includes diepoxy compounds such as vinylcyclohexene dioxide, butadiene dioxide, ethylene glycol diglycidyl ether, and polyethylene glycol diglycidyl ether. Two or more of these may be used in combination.
When these diepoxy compounds are contained in the oxirane monomer (b), a branched structure can be introduced into the polymer chain. The content of the diepoxy compound is preferably 0.1 to 5 mol% of all monomers. When the content of the diepoxy compound is large, the pressure at the time of extrusion molding becomes too high, and the molding processability may be lowered, or the surface smoothness of the extruded product may be lowered.

  The oxirane monomer (b) includes an oxirane monomer (c) having a crosslinkable functional group (hereinafter sometimes simply referred to as “crosslinkable oxirane monomer (c)”). When this crosslinkable oxirane monomer (c) is used, the polyether polymer can be crosslinked, and a molded article having high strength can be easily obtained. The crosslinkable functional group is a functional group capable of forming a crosslinked structure by reaction with a crosslinking agent, heating, irradiation with actinic radiation or the like.

The content of the crosslinkable oxirane monomer (c) is usually 18 mol% or less, preferably 2 to 15 mol%, more preferably 2 to 13 mol%, based on all monomers. When there is too much content of a crosslinkable oxirane monomer (c), it will become easy to raise | generate a gelling reaction etc. during a polymerization reaction, and there exists a possibility that molding processability may fall.
In the polyether polymer of the present invention, the crosslinkable oxirane monomer unit (C) is usually 18 mol% or less, preferably 2 to 15 mol%, more preferably 2 to 13 mol in all the repeating units of the polymer. % Content.

  Examples of the crosslinkable oxirane monomer (c) include halides of epoxy compounds and epoxy compounds having a vinyl group. Examples of halides of epoxy compounds include halogenated alkylene oxides such as epichlorohydrin, epibromohydrin, epiiodohydrin, epifluorohydrin, and epihalohydrins such as β-methylepichlorohydrin; p-chlorostyrene oxide; dibromophenyl Glycidyl ether; and the like.

  Examples of the epoxy compound having a vinyl group include ethylenically unsaturated glycidyl ethers such as vinyl glycidyl ether, allyl glycidyl ether, butenyl glycidyl ether, and o-allylphenyl glycidyl ether; butadiene monoepoxide, chloroprene monoepoxide, 4,5 Diene or polyene monoepoxides such as epoxy-2-pentene, 3,4-epoxy-1-vinylcyclohexene, 1,2-epoxy-5,9-cyclododecadiene; 3,4-epoxy-1-butene, Alkenyl epoxides such as 1,2-epoxy-5-hexene and 1,2-epoxy-9-decene; glycidyl acrylate, glycidyl methacrylate, glycidyl crotonate, glycidyl-4-heptenoate, glycidyl sorbate Glycidyl linoleate, glycidyl-4-methyl-3-pentenoate, glycidyl ester of 3-cyclohexene carboxylic acid, glycidyl ester of ethylenically unsaturated carboxylic acid such as glycidyl ester of 4-methyl-3-cyclohexene carboxylic acid; It is done. These crosslinkable oxirane monomers (c) may be used alone or in combination of two or more. Among these, halogenated alkylene oxide and ethylenically unsaturated glycidyl ether are preferable, and allyl glycidyl ether and epichlorohydrin are particularly preferable.

The polyether polymer of the present invention can be suitably obtained by the following method.
The method for producing a polyether polymer of the present invention is a polyether in which an oxirane monomer is subjected to ring-opening polymerization in the presence of a polymerization catalyst obtained by reacting phosphoric acid with organoaluminum and adding an organophosphorus compound thereto. It is a manufacturing method of a polymer, Comprising: With respect to 100 g of this oxirane monomer, organoaluminum 3.0-15.0 mmol, phosphoric acid 0.3-3.5 mmol, organophosphorus compound 0.3-6.0 It is characterized by being used at a ratio of millimolar.
When the organoaluminum and the organophosphorus compound are within the above range, the content of the high molecular weight component is easily decreased.

  As a polymerization catalyst for ring-opening polymerization of an oxirane monomer, for example, a polymerization catalyst obtained by reacting water and acetylacetone with organoaluminum (Japanese Patent Publication No. 35-15797), phosphoric acid and triethylamine with triisobutylaluminum, and the like. Polymerization catalyst (Japanese Patent Publication No. Sho 46-27534), a polymerization catalyst obtained by reacting triisobutylaluminum with an organic acid salt of diazaviacycloundecene and phosphoric acid (Japanese Patent Publication No. Sho 56-51171), aluminum Polymerization catalyst comprising a partially hydrolyzed alkoxide and an organic zinc compound (Japanese Patent Publication No. 43-2945), Polymerization catalyst comprising an organic zinc compound and a polyhydric alcohol (Japanese Patent Publication No. 45-7751), dialkyl A polymerization catalyst composed of zinc and water (Japanese Patent Publication No. 36-3394) is known. In the method for producing the polyether polymer of the present invention, an organic aluminum phosphate reacted, it is used a polymerization catalyst obtained by adding an organic phosphorus compound. When ring-opening polymerization is performed using this polymerization catalyst, it is possible to easily reduce the content of a polymer component having a molecular weight that is at least 3 times the value of the weight average molecular weight.

  Examples of organoaluminum include trialkylaluminum compounds such as triisobutylaluminum, tricycloalkylaluminum compounds, triallyl aluminum compounds, dialkylaluminum hydrides, monoalkylaluminum dihydrides, dialkylaluminum halides, monoalkylaluminum dihalides, dialkylaluminum alkoxides, And monoalkylaluminum dialkoxide.

  As the organic phosphorus compound, those acting as a Lewis base are suitable. For example, triphenylphosphine, triparatolylphosphine, trimetatolylphosphine, triorthotolylphosphine, tris (3,5-dimethylphenyl) phosphine, tris (2,4,6-trimethylphenyl) phosphine, tris (4-methoxyphenyl) ) Triarylphosphine such as phosphine. The polymerization activity is improved by the organophosphorus compound, and the contents of the high molecular weight component and the low molecular weight component are easily reduced.

  As a preferred embodiment of the polymerization catalyst used in the production method of the present invention, a polymerization catalyst obtained by reacting triisobutylaluminum and phosphoric acid, adding triphenylphosphine thereto, and aging with heating is exemplified. The temperature and time for heat aging are not particularly limited, but the aging temperature is usually 30 to 100 ° C., preferably 35 to 90 ° C., more preferably 38 to 85 ° C., and the aging time is usually 30 minutes to 5 hours, preferably Is 40 minutes to 4 hours, more preferably 45 minutes to 3 hours

  The polymerization solvent is not particularly limited as long as it does not deactivate the polymerization catalyst. For example, aromatic hydrocarbons such as benzene and toluene; chain saturated hydrocarbons such as n-pentane and n-hexane; alicyclic saturated hydrocarbons such as cyclopentane and cyclohexane;

  As the polymerization method, a polymerization method such as a solution polymerization method or a solvent slurry polymerization method can be adopted, but a solvent slurry polymerization method using a saturated hydrocarbon solvent such as n-pentane, n-hexane, or cyclopentane is preferable.

In solvent slurry polymerization, among the monomers used for polymerization, a polymerization catalyst is treated in advance with a monomer that gives a polymer insoluble in the solvent and a monomer that gives a polymer soluble in the solvent. Is preferably formed from the viewpoint of the stability of the polymerization reaction system. The treatment of the polymerization catalyst may be performed by mixing the polymerization catalyst component and a small amount of each of the above monomers and aging at a temperature of usually 0 to 100 ° C., preferably 30 to 50 ° C., usually for 3 to 90 minutes. By using the polymerization catalyst thus aged, adhesion of the polymer to the polymerization can can be prevented.
The polymerization reaction is usually 0 to 100 ° C., preferably 30 to 70 ° C., and can be performed by any method such as batch, semi-batch, and continuous methods.

Depending on the intended use, an additive usually added to a known polymer or a rubber or resin other than a polyether polymer is added to the polyether polymer of the present invention to obtain a polyether polymer composition. Can do. Additives include fillers, antioxidants (anti-aging agents), vulcanizing agents, vulcanization accelerators, crosslinking agents, UV absorbers, light stabilizers, tackifiers, surfactants, conductivity-imparting agents, Examples include electrolyte substances, colorants (dyes and pigments), and antistatic agents.
Examples of the rubber include butadiene rubber, isoprene rubber, styrene butadiene rubber, nitrile rubber, and acrylic rubber. Furthermore, thermoplastic elastomers, such as a styrene butadiene block copolymer, a styrene isoprene block copolymer, and these hydrogenated substances, are mentioned.
Examples of the resin include polyolefin resin, polyamide resin, polyester resin, polyimide resin, acrylic resin, and the like.

  The polyether polymer of the present invention is used for conductive materials used in copying machines and printing machines, adhesives and coating agents, water-absorbing materials and water-swellable materials, polymer solid electrolytes used in batteries and capacitors, etc. Can be used.

  The polyether polymer composition of the present invention contains the aforementioned polyether polymer and filler. This polyether polymer composition is suitable as a water-swellable composition as described later.

(Water-swellable composition)
The water-swellable composition of the present invention contains the polyether polymer of the present invention and a filler. Examples of the filler used in the water-swellable composition include carbon black, silica, calcium carbonate, and clay. From the viewpoint of mechanical strength and swelling degree, carbon black and silica are preferable, and silica is particularly preferable. The amount of the filler used in the water-swellable composition is usually 5 to 90 parts by weight with respect to 100 parts by weight of the polyether polymer.

The water-swellable composition of the present invention is usually used after being crosslinked. Therefore, it is preferable to mix a crosslinking agent. As the crosslinking agent, those usually used in the field of crosslinked rubber can be used. The kind and amount can be appropriately selected as desired.
The amount of the crosslinking agent used is preferably 0.5 to 30 parts by weight, more preferably 0.8 to 20 parts by weight, and still more preferably 1 to 15 parts by weight with respect to 100 parts by weight of the polyether polymer.

The water-swellable composition can be obtained by kneading the polyether polymer of the present invention and a filler. As the apparatus used for kneading, there are batch-type kneaders such as rolls, brabenders, banburys, kneaders; continuous kneaders such as single-screw extruders, twin-screw extruders, busconyders; Can be mentioned.
The conditions for crosslinking can be appropriately selected.
The water-swellable composition of the present invention is excellent in mechanical strength, compressive strength, water retention and the like.

  The polyether polymer composition of the present invention comprises the aforementioned polyether polymer, nitrile rubber, and filler. This polyether polymer composition can be suitably used as a composition for conductive rolls as described later.

(Composition for conductive roll)
The composition for conductive rolls of the present invention contains the polyether polymer of the present invention, nitrile rubber and a filler.
The nitrile rubber is a copolymer of a conjugated diene monomer, an ethylenically unsaturated nitrile monomer, and other monomers copolymerized as necessary.

The nitrile rubber is preferably a copolymer of butadiene or isoprene and acrylonitrile, particularly preferably a copolymer of butadiene and acrylonitrile, from the viewpoint of availability and compatibility with the polyether polymer. The amount of acrylonitrile units in the nitrile rubber is preferably 10 to 50% by weight, more preferably 15 to 40% by weight. The Mooney viscosity (ML _{1 + 4} , 100 ° C.) of the nitrile rubber is preferably 10 to 100, more preferably 20 to 80. The amount of nitrile rubber is preferably 10 to 2,000 parts by weight, particularly preferably 20 to 1,300 parts by weight, based on 100 parts by weight of the polyether polymer.

Examples of the filler used in the composition for conductive rolls include carbon black, silica, calcium carbonate, and clay. From the viewpoint of surface smoothness (polishing property) after polishing, calcium carbonate and clay are preferable.
The amount of filler used in the composition for the conductive roll is 5 to 70 parts by weight with respect to 100 parts by weight of the total amount of the polyether polymer and the nitrile rubber. Is preferable.

The composition for conductive rolls of the present invention is usually used after being crosslinked. Therefore, it is preferable to mix a crosslinking agent. As the crosslinking agent, those usually used in the field of crosslinked rubber can be used. The kind and amount can be appropriately selected as desired.
The amount of the crosslinking agent used is preferably 0.5 to 30 parts by weight, more preferably 0.8 to 20 parts by weight, still more preferably 1 to 100 parts by weight of the total amount of the polyether polymer and the nitrile rubber. 15 parts by weight.

The composition for conductive rolls of the present invention can be obtained by kneading the polyether polymer of the present invention, nitrile rubber and a filler. The apparatus used for kneading includes batch kneaders such as rolls, brabenders, banburys, kneaders, etc .; continuous kneaders such as single screw extruders, twin screw extruders, buscony kneaders, etc .; Is mentioned.
The conditions for crosslinking can be appropriately selected.

  The composition for conductive rolls of the present invention is excellent in environment dependency of volume resistivity, friction coefficient, and ozone resistance. Applications of rolls formed from the composition for conductive rolls of the present invention include industrial members for conveying printers, electrophotographic apparatuses for copying machines, spinning, and the like.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The solvents and monomers used were all degassed and dehydrated. In the examples and comparative examples, parts and% are based on weight unless otherwise specified.

(1) Weight average molecular weight (Mw), content of a polymer component (high molecular weight component) having a molecular weight of 3 times or more of Mw, and polymer component (low molecular weight component) having a molecular weight of 1/3 times or less of Mw The content of was measured by the following method. The contents of the high molecular weight component and the low molecular weight component were calculated from the chart area of the measured molecular weight distribution.
Apparatus: GPC system manufactured by Tosoh Corporation Column: G7000HHR + GMHHR-H manufactured by Tosoh Corporation
Detector: Differential refractometer Solvent: Dimethylformamide (Lithium bromide 5 mmol / L)
Flow rate: 1 ml / min Column temperature: 40 ° C
Molecular weight reference material: Standard polystyrene manufactured by Polymer Laboratory

(2) The amount of Al and P in the polymer was determined by preparing a calibration curve by an internal standard method using ICP-AES after preparing a sample of the obtained polymer by a wet decomposition method.
Atomic absorption device: SPS-5000 (Seiko Instruments)

(3) For the polymer composition, the polymer was dissolved in deuterated chloroform, the integral value of each unit was determined by ¹ H-NMR, and the composition ratio was determined from the calculation result.
Device: JNM-EX400 type (manufactured by JEOL Datum)

(4) Formability (T-die extrusion)
A coat hanger die (width 250 mm, lip gap 0.4 mm) is attached to the tip of a twin screw extruder (screw diameter 25 mm, screw rotation speed 100 rpm, L / D = 30), and 100 parts of polyether polymer is attached to the first feed port. The second feed port is composed of 25 parts of FEF carbon black, 15 parts of silica (product name Tokushiru GU, manufactured by Tokuyama Corporation), 5 parts of zinc oxide (Zinc Hua 1), 1 part of stearic acid, and 2 parts of diethylene glycol. Each mixture was fed and extruded into sheets. At the time of extrusion, the inlet barrel temperature was 30 ° C, the central barrel was 100 ° C, and the head and die temperatures were 120 ° C. The degree of smoothness of the surface was visually observed and evaluated according to the following criteria.
◎: The surface is smooth and glossy ○: The surface is slightly uneven, but most are smooth △: The surface is uneven ×: Many unevenness is observed on the surface, and some undulations are observed The

(Gerve die extrusion)
75 parts of polyether polymer, 25 parts of acrylonitrile-butadiene rubber (product name DN401LL, manufactured by Nippon Zeon Co., Ltd.), 25 parts of FEF carbon black, 15 parts of silica (Toxeal GU), 5 parts of zinc oxide (Zinc Hua 1), stearin 1 part of acid and 2 parts of diethylene glycol were kneaded with a Banbury mixer and further formed into a sheet with a roll. This sheet was extruded with a garbage die type extruder, and evaluated based on A method described in ASTM D 2230-77 with a maximum score of 16 points. The screw rotation speed at the time of extrusion by the garbage die type extruder is 30 rpm, the set temperature is 60 ° C. for the barrel, and 80 ° C. for the head.
◎: 13-16 points ○: 10-12 points △: 7-9 points ×: 6 points or less

(5) Water swelling test a) Water swelling ratio To 148 parts of the sheet obtained by the T-die extrusion, 0.8 part of a vulcanizing agent (powder sulfur # 325) and tetramethylthiuram disulfide (product name) as a vulcanization accelerator. 6 parts while adding 1.5 parts of Noxeller TT (manufactured by Ouchi Shinsei Chemical Co., Ltd.) and 1.2 parts of N-cyclohexylbenzothiazole-2-sulfenamide (product name Noxeller CZ, produced by Ouchi Shinsei Chemical Co., Ltd.) A sheet having a thickness of 2.2 ± 0.1 mm was obtained by kneading with an inch roll. This was cut into a predetermined size, stacked in three pieces, and pressed at 150 ° C. for 30 minutes to obtain a 25 mm × 25 mm × 5 mm test piece. This test piece was immersed in tap water at 23 ° C. for 48 hours, and its volume expansion rate was determined.

b) Surface state after water swelling The degree of smoothness of the surface of the test piece after measuring the volume swelling rate was visually observed, and the surface state was evaluated according to the following criteria.
○: Uniformly swollen and the surface is almost smooth Δ: Slightly non-uniformly swelled and undulations are observed on a part of the surface ×: Swelled fairly unevenly and large surface Waves are observed

c) Adhesiveness to natural rubber gloves The surface of the sheet after measuring the volume swelling rate is touched with a hand wearing natural rubber gloves (manufactured by AZONE, Qualatec gloves), and the degree of adhesion is subjected to a sensory test according to the following criteria. Then, the tackiness was evaluated.
○: There is a little stickiness. When you lift the glove, the sheet lifts on the glove, but the sheet falls off immediately due to its own weight.
Δ: There is some stickiness. When you lift the glove, the sheet lifts on the glove. After a while, the sheet falls by its own weight.
X: There is stickiness and it is hard to peel off from a glove.

(6) Volume resistivity value and variation thereof For 148 parts of the product obtained by kneading with a Banbury mixer for the above-mentioned carve die extrusion evaluation, 0.8 part of a vulcanizing agent (powder sulfur # 325) and a vulcanization accelerator Kneaded with a 6 inch roll while adding 1.5 parts of tetramethylthiuram disulfide (TT) and 1.2 parts of N-cyclohexylbenzothiazole-2-sulfenamide (CZ) as a thickness of 2.2 ± 0. A 1 mm sheet was obtained. This sheet was vulcanized with a press at 160 ° C. for 30 minutes to obtain a sheet of 150 mm × 150 mm × 2 mm. The volume specific resistance value of the vulcanized sheet was measured according to JIS K6911. In addition, the variation in the volume resistivity value was produced in the same manner as described above by preparing five vulcanized sheets, measuring their respective volume resistivity values, and calculating the average value of the difference between the maximum value and the minimum value in the measured values. Divided by%.

Example 1 (Production of polyether polymer P-1)
An autoclave with a stirrer that was dried and purged with nitrogen was charged with 10.08 parts of triisobutylaluminum, 33.73 parts of toluene, and 18.82 parts of diethyl ether. The temperature in the autoclave was 30 ° C., and 0.70 part of phosphoric acid was added at a constant rate over 10 minutes while stirring. To this was added 5.33 parts of triphenylphosphine and aged at 60 ° C. for 2 hours to obtain a polymerization catalyst.

  In an autoclave with stirring, which was dried and purged with nitrogen, 1514 parts of n-hexane and 68.66 parts of the polymerization catalyst solution were charged. The temperature in the autoclave was adjusted to 30 ° C., and 1.2 parts of ethylene oxide (EO) was added with stirring and reacted for 0.2 hours (first step). Next, a mixture of 0.6 parts of ethylene oxide and 1.4 parts of propylene oxide (PO) was added and reacted for 0.2 hours to obtain a seed dispersion (second step).

  Subsequently, the temperature in the autoclave was set to 60 ° C., and 416.6 parts of ethylene oxide, 34.7 parts of propylene oxide, 49.5 parts of allyl glycidyl ether (AGE), and 439.8 parts of n-hexane were added to the seed dispersion. The mixed solution consisting of was continuously added at a constant rate over 5 hours. After completion of the addition, stirring was continued for 2 hours for reaction to obtain a slurry (third step). The polymerization reaction rate was 99%. To the obtained slurry, 9.8 parts of ethanol was added as a polymerization terminator, and 43 parts of a 4% 5% toluene solution of 4,4′-thiobis (6-tert-butyl-3-methylphenol) was added as an antioxidant. And stirring to obtain a polymer crumb. The crumb was separated by filtration and vacuum dried at 40 ° C. to obtain a powdery polyether polymer P-1.

  Polyether polymer P-1 was a polymer composed of 90.2 mol% ethylene oxide units, 5.9 mol% propylene oxide units, and 3.9 mol% allyl glycidyl ether units. The weight average molecular weight (Mw) of this polyether polymer P-1 is 148,000, the proportion of the polymer component having a molecular weight of 3 times or more of Mw is 1.2%, and the molecular weight of 1/3 or less of Mw. The proportion of the polymer component was 9.7%. The residue of phosphorus in the polymer of the polyether polymer P-1 was 0.17%. Table 1 shows the production conditions, weight average molecular weight and high molecular weight component content of the polyether polymer P-1, and monomer unit composition in the polymer. Table 2 shows the evaluation results of the polymer P-1.

Examples 2-3 and Comparative Example 1
Table 1 shows the amounts of triisobutylaluminum, phosphoric acid and triphenylphosphine used in the polymerization catalyst solution, and the amounts of ethylene oxide (EO), propylene oxide (PO) and allyl glycidyl ether (AGE) used in the polymerization reaction. A polyether polymer was obtained in the same manner as in Example 1 except for changing to. Table 1 shows the production conditions, weight average molecular weight and high molecular weight component content, and monomer unit composition of the polyether polymers P-2, P-3, and P-5. In addition, Table 2 shows the evaluation results of the polymer P-5.

Example 4
Table 1 shows the amounts of triisobutylaluminum, phosphoric acid and triphenylphosphine used in the polymerization catalyst solution, and the amounts of ethylene oxide (EO), propylene oxide (PO) and allyl glycidyl ether (AGE) used in the polymerization reaction. A polyether polymer P-4 was obtained in the same manner as in Example 1 except for changing to. Table 1 shows the production conditions, weight average molecular weight and high molecular weight component content, and monomer unit composition of the polyether polymer P-4. Table 2 shows the evaluation results of the polymer P-4.

Comparative Example 2
An autoclave equipped with a stirrer that was dried and purged with nitrogen was charged with 10.08 parts of triisobutylaluminum, 33.74 parts of toluene, and 18.83 parts of diethyl ether. The temperature in the autoclave was 30 ° C., and 1.49 parts of phosphoric acid was added at a constant rate over 10 minutes while stirring. To this, 1.03 part of triethylamine was added and aged for 2 hours at 60 ° C. to obtain a polymerization catalyst solution.

  In a dried and nitrogen-substituted autoclave equipped with a stirrer, 1514 parts of n-hexane and 65.16 parts of the polymerization catalyst solution were charged. The temperature in the autoclave was set to 30 ° C., and 1.2 parts of ethylene oxide was added with stirring and reacted for 15 minutes (first step). Next, a mixture of 0.6 parts of ethylene oxide and 1.4 parts of propylene oxide was added and reacted for 15 minutes to obtain a seed dispersion (second step).

  Subsequently, the temperature in the autoclave was set to 60 ° C., and the seed dispersion was mixed with 416.6 parts of ethylene oxide, 34.7 parts of propylene oxide, 49.5 parts of allyl glycidyl ether, and 439.8 parts of n-hexane. The solution was added continuously at a constant rate over 5 hours. After completion of the addition, stirring was continued for 2 hours for reaction to obtain a slurry (third step). The polymerization reaction rate was 98%. To the obtained slurry, 9.8 parts of ethanol was added as a polymerization terminator, and 43 parts of a 4% 5% toluene solution of 4,4′-thiobis (6-tert-butyl-3-methylphenol) was added as an antioxidant. And stirring to obtain a polymer crumb. The crumb was separated by filtration and vacuum dried at 40 ° C. to obtain a powdery polyether polymer P-6.

  Polyether polymer P-6 is composed of 90.3 mol% ethylene oxide (EO) units, 6.0 mol% propylene oxide (PO) units, and 3.7 mol% allyl glycidyl ether (AGE) units. It was a coalescence. Moreover, the weight average molecular weight (Mw) of this polymer P-6 was 168,000, and the ratio of the polymer component of the molecular weight 3 times or more of Mw was 24.6%. Table 1 shows production conditions, weight average molecular weight and high molecular weight component content, and monomer unit composition of the polyether polymer P-6. In addition, Table 2 shows the evaluation results of the polymer P-6.

Comparative Example 3
The same as Example 1 except that the amounts of triisobutylaluminum, phosphoric acid and triphenylphosphine used for the polymerization catalyst solution and the amounts of EO, PO and AGE used for the polymerization reaction were changed to the amounts shown in Table 1. Thus, a polyether polymer P-7 was obtained. Table 1 shows the production conditions, weight average molecular weight and high molecular weight component content, and monomer unit composition of the polyether polymer P-7. In addition, Table 2 shows the evaluation results of the polymer P-7.

  From the above results, as shown in Table 1, when the oxirane monomer is subjected to ring-opening polymerization in the presence of a polymerization catalyst using organoaluminum, phosphoric acid, and an organophosphorus compound within the scope of the present invention, It can be seen that the content of can be greatly reduced.

According to Table 2, the polyether polymer (Comparative Examples 1 to 3) containing a higher content of the high molecular weight component than the specified range of the present invention is inferior in molding processability and inferior in the surface state after water swelling. It can be seen that the variation in the volume resistivity value is large. On the other hand, the polyether polymer (Examples 1 and 4) in which the content of the high molecular weight component is within the specified range of the present invention has good moldability in both T-die extrusion and garbage die extrusion. It can be seen that the surface state after water swelling and the adhesiveness are also good, and the variation in the volume resistivity value is small.

Claims (4)

A polyether polymer having a weight average molecular weight of 50,000 or more and 1,000,000 or less, and a content of a polymer component having a molecular weight of 3 or more times the value of the weight average molecular weight, of 15% by weight or less ;
Nitrile rubber and
A composition for conductive rolls containing a filler . The polyether polymer contains phosphorus and aluminum, the phosphorus content is 0.10 to 0.32% by weight, and the weight ratio of phosphorus to aluminum (P / Al) is 0.2 to 1. The composition for electroconductive rolls of Claim 1 which is 1. The polyether polymer comprises 80 to 98 mol% of ethylene oxide monomer units (A) and 2 to 20 mol% of other oxirane monomer units (B) copolymerizable with ethylene oxide monomers. 3. The composition for conductive rolls according to 1 or 2. The composition for conductive rolls according to claim 3, wherein the oxirane monomer unit (B) comprises at least one of an allyl glycidyl ether monomer unit and an epichlorohydrin monomer unit.