JP2001079773A - Abrasive body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a hydrophilic property to an abrasive body with aluminum hydroxide and to reduce grinding scars on the end face of an optical fiber when grinding the end face of a connector ferrule for the optical fiber by including the aluminum hydroxide, an abrasive, and a binder in an abrasive layer applied on a carrier. SOLUTION: An abrasive layer 3 including an abrasive made of alumina, cerium or the like with α-crystal grains and having the average grain size of 0.1-50 μm, aluminum hydroxide having the average grain size of 0.1-50 μm, and a binder is laminated to the thickness of about 5-25 μm, for example, on a carrier 2 made of a polyester film or the like and having the thickness of 25-200 μm to form an abrasive body 1. The abrasive body 1 is formed into an abrasive sheet having a prescribed shape such as a disk shape. The average grain size of the abrasive included in the slurry (e.g. 0.005-0.1 μm for silica) is preferably set smaller than the average grain size of the abrasive of the abrasive layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing body such as a polishing sheet and a polishing disk used for polishing an end face of an optical fiber connector ferrule.

[0002]

2. Description of the Related Art For example, the end face of an optical connector ferrule in which an optical fiber is inserted and fixed in a ferrule hole is conventionally polished using a polishing body or a polishing slurry. Sufficient results have not always been obtained with respect to transmission loss and the like.

In other words, the end face of the connector ferrule for optical fiber contains different materials including many ceramics such as glass material, alumina, and zirconia, and these must be uniformly cut to prevent optical transmission loss. In particular, it has been extremely difficult to maintain the smoothness between the ferrule surface and the optical fiber surface, and to obtain a low reflection characteristic by polishing so as not to cause a step between the ferrule surface and the optical fiber surface.

[0004] As an example of the polishing body, Japanese Patent Application Laid-Open No. H8-3
As disclosed in JP 36758, a coating liquid for a polishing layer in which colloidal silica particles having an average particle size of 0.01 to 0.1 μm are dispersed in a binder is applied on a support to form a polishing layer. Polished bodies have been proposed.

[0005] By the way, the production of the above-mentioned abrasive body is as follows.
It is performed by a coating liquid dispersion device, a coating device, and, if necessary, a calendering process, a heat treatment device, a slit device (cutting device), a winding device, and the like.

[0006]

However, in the above-mentioned polishing body of the prior art, the average particle size is 0.01 to 0.01.
Although 0.1 μm colloidal silica particles are dispersed in the polishing layer, such fine silica particles are difficult to control the viscosity and concentration of the coating solution, and are disadvantageous in terms of productivity, cost, etc. Has become.

In addition to silica, chromium oxide, alumina (aluminum oxide), diamond and the like can be considered as a polishing material for polishing the end face of the optical fiber ferrule.

However, if the abrasive fine powder made of alumina or the like other than silica has a high Mohs hardness, the end face of the optical fiber may be damaged or a step may be generated between the end face of the ferrule and the Mohs altitude is low. In such a case, there is a possibility that the return loss is increased without a smooth surface due to insufficient polishing power.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a polishing body suitable for polishing the end surface of an optical fiber connector ferrule by reducing the occurrence of scratches when using an abrasive such as alumina or cerium oxide. It will not be provided.

[0010]

According to the present invention, there is provided a polishing body for polishing an end face of a connector ferrule for an optical fiber, comprising a support having a polishing layer applied thereon. The polishing layer contains aluminum hydroxide, an abrasive, and a binder.

The aluminum hydroxide is Al (O
H) ₃ , represented by the chemical formula of Al ₂ O ₃ .3H ₂ O.

Preferably, the abrasive and the aluminum hydroxide have an average particle size of 0.1 to 50 μm. The average particle size is preferably 0.1 to 20 μm.
m, more preferably 0.2 to 10 μm.

The abrasive is cerium oxide, alumina,
Those containing at least one of chromium oxide, silicon carbide, diamond, and silica are preferable.

Further, as the abrasive, fine alumina powder having α crystal grains produced by firing aluminum hydroxide can be suitably used. At this time, the average particle size of the α crystal grains (primary particles) of the alumina fine powder is 0.1 to 10 μm.
m is preferred. As a method for producing this alumina, for example, bauxite is pulverized by a rod mill, melt-mixed with caustic soda, and then Fe and Si are separated in a separation tank. After filtration, aluminum hydroxide is produced in a precipitation tank.
The size is controlled by the time and temperature conditions. After concentration, decolorization is performed, and dehydration is performed using a rotary kiln to obtain alumina. Unlike the crushing method, the alumina produced by this calcination has round particles.

It is preferable that the surface of the polishing layer is subjected to a calendering treatment in order to obtain desired surface properties and tighten the film to improve durability.

The support has a thickness of 25 to 200 μm.
It is preferred to use a polyester of m (preferably 50-100 μm).

Another polishing body of the present invention is a polishing body for polishing an end face of an optical fiber connector ferrule having a polishing layer coated on a support, wherein the polishing layer is made of metal hydroxide or saturated metal. It is characterized by containing a water metal oxide, cerium oxide and a binder.

It is possible to polish the surface of the polishing layer while supplying a polishing liquid composed of water or a slurry (eg, a silica slurry). This polishing liquid preferably does not contain a base or an acid.

[0019]

According to the abrasive body of the present invention as described above, since the abrasive layer applied on the support contains aluminum hydroxide, an abrasive and a binder, the aluminum hydroxide imparts hydrophilicity. When the end face of the optical fiber connector ferrule is polished, the occurrence of grinding scratches on the end face of the optical fiber can be reduced and the polishing performance can be improved. In addition, excellent dispersibility of the coating solution, excessive aggregation of particles,
It is uniformly dispersed in the binder without causing gelation, so that the production efficiency is improved and the polishing body can be obtained at low cost.

That is, in the connector ferrule for an optical fiber whose end surface is polished by the polishing body of the present invention, the shape of the tip portion of the optical fiber becomes a predetermined curved surface shape without causing scratches on the surface to be polished, and the optical fiber (quartz glass) ) And a ferrule (such as zirconia) are polished without any step between the polished surfaces, and the return loss in light transmission when joining the polished end surfaces is -40.
It can be reduced to dB or less, and further, since there is no step, the end face is hardly stained.

When an abrasive and aluminum hydroxide having an average particle size of 0.1 to 50 μm are used, the dispersibility and the surface properties of the polishing layer are improved, which is suitable for finish polishing of a connector ferrule for an optical fiber.
Further, the one in which the smoothness of the polishing layer surface is adjusted by the calendering treatment can obtain suitable finish polishing characteristics, and the film is tightened to improve the durability.

When alumina obtained by calcining aluminum hydroxide is used as the abrasive, the abrasive particles composed of α crystal particles (primary particles) and their aggregates are rounded, have no corners, and are crushed. Compared to alumina, the cause of the occurrence of scratches is eliminated, and polishing can be performed without damaging the fiber surface. In particular, the α crystal having a particle size of 0.1 to 10 μm is optimal.

On the other hand, in the case where cerium oxide is used as an abrasive, the cerium oxide has a remarkable effect on the polishing characteristics of glass, and as a material for imparting hydrophilicity, other metal hydroxides such as aluminum hydroxide and saturated metal are used. The water metal oxide can be used equally, and the end face of the optical fiber connector ferrule can be polished without causing a grinding flaw on the end face of the optical fiber.

In the polishing with the polishing body of the present invention, a polishing liquid with water or a slurry can be used if necessary, and a polishing liquid which provides lubricity and cooling properties and does not contain a base and an acid can be used. This facilitates waste liquid treatment.

The thickness of the support is preferably 25 to 200 μm. If it is less than 25 μm, it is thin and wrinkled, resulting in poor polishing aptitude. It becomes difficult to paste.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a polishing body and a method for manufacturing the same according to the present invention will be described, and the present invention will be described in more detail. FIG. 1 shows a conceptual diagram of a state of polishing by a polishing body according to one embodiment.

The abrasive body 1 is formed on a support 2 made of a polyester film or the like and having a thickness of 25 to 200 μm.
Abrasive material of 1 to 50 μm and average particle size of 0.1 to 5
It is formed by laminating a polishing layer 3 containing 0 μm aluminum hydroxide (or another metal hydroxide, a saturated metal oxide) and a binder to a thickness of, for example, 5 to 25 μm, and has a predetermined shape such as a disk shape. And the like.

Optical fiber connector ferrule 5
Is a ferrule 6 made of ceramic material such as zirconia
The optical fiber 7 made of a glass material such as quartz glass is inserted and fixed in the center hole of the optical fiber. The tip of the connector ferrule 5 is polished by sticking the abrasive body 1 to an elastic body 11 such as rubber provided on a base 10 (turntable), and applying the tip of the connector ferrule 5 to the abrasive body 1 at a predetermined pressure. The base 10 or the connector ferrule 5 is caused to relatively rotate in a planetary manner while the base 10 is rotated at a predetermined number of revolutions by pressing and contacting, and water or slurry (silica slurry or the like) is supplied from the supply nozzle 15 to the polishing portion. The polishing liquid 16 (coolant liquid) is supplied to perform wet polishing.

The polishing liquid 16 is for obtaining lubricity and cooling property of the polished portion, does not contain a base or acid, and in the case of a slurry, the average particle size of the abrasive contained in the slurry (for example, 0.005 ０．１0.1 μm) is preferably smaller than the average particle size of the abrasive in the polishing layer 3.

The relative movement of the base 10 and the connector ferrule 5 in polishing may be such that only one of them is moved, and the type of movement may be changed as appropriate.

Although the basic manufacturing process of the polishing body 1 is not shown, the above-mentioned coating liquid for a polishing layer containing the above-mentioned aluminum hydroxide, an abrasive, a binder, a solvent and the like is applied by a coating liquid manufacturing apparatus (such as a ball mill). Dispersion adjustment, this coating solution is applied to a predetermined thickness on a support running at a predetermined speed by a coating device, dried by a drying device to form a polishing layer, and thereafter, provided with a metal roll or a resin roll The surface of the polishing layer is subjected to a calendering process using a calendering device, and then a heat treatment device if necessary. Then, it is formed into a predetermined shape by a punching process, a cutting process, or the like to form a polishing body.

As the abrasive fine powder used in the polishing layer of the present invention, those containing at least one of alumina, cerium oxide, chromium oxide, silicon carbide, diamond and silica having α crystal grains can be suitably used. However, other abrasives can also be used. Other abrasives have Mohs hardness of 6
-10 and 30% or less of the total amount of the powder. The abrasive is generally a material having a polishing action or a polishing action, such as γ-alumina, α, γ-alumina, fused alumina, corundum, α-iron oxide, silicon nitride, boron nitride, molybdenum carbide, boron carbide , Tungsten carbide, titanium carbide, zirconia, titanium oxide, red iron oxide, garnet, etc., mainly materials with a Mohs hardness of 7 or more
Can be used in combinations up to species. These abrasives have an average particle size of 0.1 to 100 μm. The powder containing these abrasives and the aluminum hydroxide was mixed with a binder 10 to 100 parts by weight of the powder.
It is used in the range of 1,000 parts by weight (preferably 30 to 100 parts by weight). Specific examples of the abrasive include AKP1, AKP15, AKP20, AKP30 manufactured by Sumitomo Chemical Co., Ltd.
AKP50, AKP80, Hit50, Hit100 and the like. These are described in JP-B-52-286.
No. 42, JP-B-49-39402, JP-A-63-98
No. 828, U.S. Pat. No. 3,687,725, U.S. Pat.
No. 7807, U.S. Pat. No. 3,041,196, U.S. Pat.
No. 93066, U.S. Pat. No. 3,630,910, U.S. Pat.
No. 8,334,412, U.S. Pat. No. 4,117,190, British Patent 1,145,349, West German Patent 853211 and the like.

Examples of the binder used in the polishing layer of the present invention include conventionally known thermoplastic resins, thermosetting resins, reactive resins, electron beam-curable resins, ultraviolet-curable resins, visible light-curable resins, and the like. Is used.

As the thermoplastic resin, the softening temperature is 200
C. or lower, having an average molecular weight of 10,000 to 300,000 and a degree of polymerization of about 50 to 2,000, more preferably 20 to 2,000.
It is about 0 to 800. For example, vinyl chloride vinyl acetate copolymer, vinyl chloride copolymer, vinyl chloride vinyl acetate vinyl alcohol copolymer, vinyl chloride vinyl alcohol copolymer, vinyl chloride vinylidene copolymer, vinyl acrylonitrile copolymer, acrylic acid Ester acrylonitrile copolymer, acrylate vinylidene chloride copolymer, acrylate styrene copolymer, methacrylate acrylonitrile copolymer,
Methacrylic acid ester vinylidene chloride copolymer, methacrylic acid ester styrene copolymer, urethane elastomer, nylon-silicone resin, nitrocellulose-polyamide resin, polyfucca vinyl, vinylidene chloride acrylonitrile copolymer, butadiene acrylonitrile copolymer, polyamide Resins, polyvinyl butyral, cellulose derivatives (cellulose acetate butyrate, cellulose diacetate, cellulose triacetate, cellulose propionate, nitrocellulose, ethyl cellulose, methyl cellulose, propyl cellulose, methyl ethyl cellulose, carboxymethyl cellulose,
Acetylcellulose), various synthetic rubber-based thermoplastic resins such as styrene-butadiene copolymer, polyester resin, polycarbonate resin, chlorovinyl ether acrylate copolymer, amino resin, polyamide resin, and mixtures thereof. .

Examples of these resins are described in JP-B-37-68.
No. 77, JP-B-39-12528, JP-B-39-19
No. 282, No. 40-5349, No. 40-20
No. 907, JP-B-41-9463, JP-B-41-14
No. 059, JP-B-41-16985, JP-B-42-6
No. 428, JP-B-42-11621, JP-B-43-4
No. 623, JP-B-43-15206, JP-B-44-2
No. 889, No. 44-17947, No. 44-1
No. 8232, No. 45-14020, No. 45-
14500, JP-B-47-18573, JP-B-47
-22063, JP-B-47-2264, JP-B-4
7-22068, JP-B-47-22069, JP-B-47-22070, JP-B-47-27886, JP-A-57-133521, JP-A-58-137133.
JP-A-58-166533, JP-A-58-222
No. 433, JP-A-59-58642 and the like.
No. 71364, U.S. Pat. No. 4,752,530, and the like.

The thermosetting resin or the reactive resin has a molecular weight of 200,000 or less in the state of a coating liquid, and becomes infinite by a reaction such as condensation and addition by heating and humidifying after coating and drying. Is preferred. Among these resins, those which do not soften or melt before the resin is thermally decomposed are preferable. Specifically, for example, a phenol resin, a phenoxy resin, an epoxy resin, a polyurethane resin, a polyester resin, a polyurethane polycarbonate resin, a urea resin, a melamine resin, an alkyd resin, a silicone resin, an acrylic reaction resin (an electron beam curing resin), and an epoxy-polyamide Resin, nitrocellulose melamine resin, mixture of high molecular weight polyester resin and isocyanate prepolymer, mixture of methacrylate copolymer and diisocyanate prepolymer, mixture of polyester polyol and polyisocyanate, urea formaldehyde resin, low molecular weight glycol / high molecular weight A diol / triphenylmethane triisocyanate mixture, a polyamine resin, a polyimine resin, and mixtures thereof.

Examples of these resins are described in JP-B-39-810.
No. 3, JP-B-40-9779, JP-B-41-7192
No., JP-B-41-8016, JP-B-41-14275
No., JP-B-42-18179, JP-B-43-1208
No. 1, Japanese Patent Publication No. 44-28023, Japanese Patent Publication No. 45-145
No. 01, JP-B-45-24902, JP-B-46-13
103, JP-B-47-2265, JP-B-47-2
No. 2066, JP-B-47-22067, JP-B-47-
22072, JP-B-47-22073, JP-B-47
-28045, JP-B-47-28048, JP-B-4
It is described in publications such as 7-28922.

These thermoplastic resins, thermosetting resins, and reactive resins have carboxylic acid (COOM), sulfinic acid, sulfenic acid, sulfonic acid (SO ₃ M), phosphoric acid (PO (OM) (OM)), phosphonic acid, sulfuric acid (OSO ₃ M), and acidic groups such as ester groups thereof (M is H, an alkali metal, an alkaline earth metal,
Hydrocarbon groups), amino acids; aminosulfonic acids, sulfuric acid or phosphoric acid esters of amino alcohols, amphoteric groups such as alkyl betaine, amino groups, imino groups, imide groups,
An amide group, etc., a hydroxyl group, an alkoxyl group, a thiol group, an alkylthio group, a halogen group (F, Cl, Br,
I) a silyl group, a siloxane group, an epoxy group, an isocyanato group, a cyano group, a nitrile group, an oxo group, an acryl group, and a phosphine group. ^-6 eq ~ 1 × 10 ^-2
It is preferable to include eq.

The polyisocyanate as a curing agent used in the polishing layer of the present invention includes tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate, naphthylene-1,5-diisocyanate, o-
Isocyanates such as toluidine diisocyanate, isophorone diisocyanate, triphenylmethane triisocyanate, isophorone diisocyanate, products of the isocyanates and polyalcohols, polyisocyanates of 2 to 10-mers produced by condensation of isocyanates, polyisocyanates and polyurethanes And those whose terminal functional groups are isocyanates can be used. The average molecular weight of these polyisocyanates is preferably 100 to 20,000.

Commercially available trade names of these polyisocyanates include Coronate L, Coronate HL, Coronate 2030, Coronate 2031, Millionate MR, Millionate MTL (all manufactured by Nippon Polyurethane Co., Ltd.), Takenate D-102, and Takenate D-110.
N, Takenate D-200, Takenate D-202, Takenate 300S, Takenate 500 (manufactured by Takeda Pharmaceutical Co., Ltd.), Sumidur T-80, Sumidur 44S, Sumidur PF, Sumidur L, Sumidur N, Desmodur L , Death module IL, death module N, death module HL, death module T65, death module 15, death module R, death module R
F, death module SL, death module Z4273
(Manufactured by Sumitomo Bayer Co., Ltd.), and these can be used alone or in combination of two or more by utilizing the difference in curing reactivity.

For the purpose of accelerating the curing reaction, a hydroxyl group (butanediol, hexanediol, having a molecular weight of 100
A compound having an amino group (such as monomethylamine, dimethylamine, or trimethylamine), a metal oxide catalyst, or a catalyst such as iron acetylacetonate can also be used in combination. It is desirable that these compounds having a hydroxyl group or an amino group are polyfunctional. These polyisocyanates have a total amount of binder resin and polyisocyanate of 10 in the polishing layer and the back layer.
It is preferably used in an amount of 2 to 70 parts by weight per 0 parts by weight, more preferably 5 to 50 parts by weight. Examples of these are disclosed in JP-A-60-131622 and JP-A-61-741.
No. 38 and the like.

In addition, compounds having various functions are added to the polishing layer as additives. For example, a dispersant, a lubricant, an antistatic agent, an antioxidant, a fungicide, a coloring agent, a solvent, and the like are added.

The powdery lubricant used in the present invention includes graphite, molybdenum disulfide, boron nitride, graphite fluoride, calcium carbonate, barium sulfate, silicon oxide, titanium oxide, zinc oxide, tin oxide, and tungsten disulfide. Inorganic fine powder, acrylic styrene resin fine powder, benzoguanamine resin fine powder, melamine resin fine powder, polyolefin resin fine powder, polyester resin fine powder, polyamide resin fine powder, polyimide resin fine powder, polyimide resin fine powder There are resin fine powders such as ethylene resin fine powder.

As the organic compound-based lubricant, silicone oil (dialkyl polysiloxane, dialkoxy polysiloxane, phenyl polysiloxane, fluoroalkyl polysiloxane (KF96, KF69 manufactured by Shin-Etsu Chemical Co., Ltd.)
)), Fatty acid-modified silicone oil, fluoroalcohol, polyolefin (polyethylene wax, polypropylene, etc.), polyglycol (ethylene glycol, polyethylene oxide wax, etc.), tetrafluoroethylene oxide wax, polytetrafluoroglycol, perfluoroalkyl ether, perfluoro Fatty acids, perfluoro fatty acid esters, perfluoroalkyl sulfates, perfluoroalkyl sulfonates, perfluoroalkylbenzene sulfonates, perfluoroalkyl phosphates, and other compounds containing fluorine or silicon, alkyl sulfates, alkyl sulfonates , Alkyl phosphonic acid triester,
Organic acids and organic acid ester compounds such as alkyl phosphonic acid monoesters, alkyl phosphonic acid diesters, alkyl phosphates, succinates, etc., triazaindolizine, tetraazaindene, benzotriazole, benzotriazine, benzodiazole, EDTA, etc. nitrogen·
Heterocyclic compound containing sulfur, having 10 to 40 carbon atoms
Consisting of a monobasic fatty acid of formula (I) and any one or more of monohydric or dihydric alcohols having 2 to 40 carbon atoms, trihydric alcohol, tetrahydric alcohol, and hexahydric alcohol Esters, fatty acid esters of monohydric to hexavalent alcohols having a total of 11 to 70 carbon atoms in total with monobasic fatty acids having 10 or more carbon atoms and carbon atoms of the fatty acids, 8 to 40 carbon atoms And fatty acid amides, fatty acid alkyl amides and aliphatic alcohols.

Specific examples of these compounds include butyl caprylate, octyl caprylate, ethyl laurate, butyl laurate, octyl laurate, ethyl myristate, butyl myristate, octyl myristate, 2-ethylhexyl myristate, Ethyl palmitate, butyl palmitate, octyl palmitate, 2 ethylhexyl palmitate, ethyl stearate, butyl stearate, isobutyl stearate, octyl stearate, 2 ethylhexyl stearate, amyl stearate, isoamyl stearate, 2 stearic acid
Ethylpentyl, 2-hexyldecyl stearate, isotridecyl stearate, stearic acid amide, alkyl stearate, butoxyethyl stearate,
Anhydrosorbitan monostearate, anhydrosorbitan distearate, anhydrosorbitan tristearate, anhydrosorbitan tetrastearate, oleyl oleate, oleyl alcohol, lauryl alcohol, montan wax, carnauba wax, etc. used alone or in combination it can.

The lubricant used in the present invention includes:
Lubricating oil additives can be used alone or in combination. Antioxidants known as rust inhibitors (metal chelates such as alkylphenol, benzotriazine, tetraazaindene, sulfamide, guanidine, nucleic acid, pyridine, amine, hydroquinone, EDTA, etc.) Agents), rust inhibitors (naphthenic acid, alkenyl succinic acid, phosphoric acid, dilauryl phosphate, etc.), oil agents (rapeseed oil, lauryl alcohol, etc.), extreme pressure agents (dibenzyl sulfide, tricresyl phosphate, tributyl) Phosphite, etc.), detergents / dispersants, viscosity index improvers, pour point depressants, foaming agents and the like. These lubricants are added in the range of 0.01 to 30 parts by weight based on 100 parts by weight of the binder. These are described in JP-B-43-23889 and JP-B-48-24.
No. 041, JP-B-48-18482, JP-B-44-1
No. 8221, JP-B-47-28043, JP-B-57-
No. 56132, JP-A-59-8136, JP-A-59-8136
No. 8139, JP-A-61-85621, U.S. Pat.
No. 23233, US Pat. No. 3470021, US Pat.
492,235, U.S. Pat. No. 3,497,411, U.S. Pat. No. 3,523,086, U.S. Pat. No. 3,625,760, U.S. Pat. No. 3,630,772, U.S. Pat. No. 3,634,253, U.S. Pat.
US Patent No. 4,552,794, IBM Technical
Disclosure Bulletin (IBM Technica
l Disclosure Bulletin) Vo
l. 9, No7, p779 (December 1966), Electronic (ELEKTRONIK) 1961 No1
2, p380, Handbook of Chemistry, Application, p954-967,
It is described in the publication of Maruzen shares in 1980.

The dispersing agent and dispersing agent for the abrasive used in the present invention include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, elaidic acid, linoleic acid, linolenic acid, C2 of stearic acid, behenic acid, maleic acid, phthalic acid, etc.
40 pieces of fatty acids (R ₁ COOH, R ₁ is a carbon number 1 to 39
Alkyl groups, phenyl groups, aralkyl groups), alkali metals (Li, Na, K, NH ₄ ^+, etc.) or alkaline earth metals (Mg, Ca, Ba, etc.) of the above fatty acids, Cu, P
metal soap (copper oleate), fatty acid amide, lecithin (soybean oil lecithin) or the like composed of b. In addition, higher alcohols having 4 to 40 carbon atoms (butanol, octyl alcohol, myristyl alcohol, stearyl alcohol) and their sulfates, sulfonic acids,
Phenylsulfonic acid, alkylsulfonic acid, sulfonic ester, phosphoric monoester, phosphoric diester, phosphoric triester, alkylphosphonic acid, phenylphosphonic acid, amine compound and the like can also be used. Further, polyethylene glycol, polyethylene oxide, sulfosuccinic acid, metal sulfosuccinate, sulfosuccinate, and the like can also be used. One or more of these dispersants are usually used, and one kind of the dispersant is added in an amount of 0.005 to 20 parts by weight based on 100 parts by weight of the binder. Regarding the method of using these dispersants, the dispersants may be pre-applied to the surface of the abrasive or the non-abrasive fine powder, or may be added during dispersion.
Such a thing is, for example, JP-B-39-28369,
JP-B-44-17945, JP-B-44-18221
No., JP-B-48-7441, JP-B-48-15001
No., JP-B-48-15002, JP-B-48-1636
No. 3, JP-B-49-39402, U.S. Pat.
Nos. 93 and 3470021.

As the antifungal agent used in the present invention, 2- (4
-Thiazolyl) -benzimidazole, N- (fluorodichloromethylthio) -phthalimide, 10.10'-
Oxybisphenoxalcin, 2,4,5.6 tetrachloroisophthalonitrile, P-tolyldiiodomethylsulfone, triiodoallyl alcohol, dihydroacetoacid, mercury phenyloleate, bis (tributyltin) oxide, saltylani There are rides. Such a substance is described in, for example, "Microbial Disaster and Prevention Technology", Engineering Book, 1972, "Chemistry and Industry", 32, 904 (1979).

As the antistatic agent used in the present invention, carbon black can be used.
Thermal for rubber, black for color, acetylene black and the like can be used. Its specific surface area is 5-500
m ² / g, DBP oil absorption 10-400 ml / 100
g, pH 2-10, water content 0.1-10%, tap density 0.1-1 g / cm ² . As a specific example of this carbon black, BLACKPEARLS 2000, 1300, 1 manufactured by Cabot Corporation
000,900,800,700, manufactured by Mitsubishi Chemical Corporation:
650B, 950B, 3250B, 850, 900, 9
60,980,1000,2300,2400,260
0 and the like. In addition, carbon black that has been subjected to surface treatment with a dispersant or the like or graphitized with a resin can also be used.

As the antistatic agent other than carbon black used in the present invention, graphite, modified graphite,
Conductive powders such as carbon black graft polymer, tin oxide-antimony oxide, tin oxide, titanium oxide-tin oxide-antimony oxide; natural surfactants such as saponin; alkylene oxide-based, glycerin-based, glycidol-based, polyhydric alcohol, Nonionic surfactants such as polyhydric alcohol esters and alkylphenol EO adducts; higher alkylamines, cyclic amines, hydantoin derivatives, amidoamines, esteramides, quaternary ammonium salts, pyridine and other heterocycles, phosphoniums and sulfoniums Anionic surfactants containing acidic groups such as carboxylic acid, sulfonic acid, phosphonic acid, phosphoric acid, sulfate ester group, phosphonate ester, phosphate ester group; amino acids; aminosulfonic acids, sulfuric acid of amino alcohol or Phosphoric esters, amphoteric surfactants such as alkyl betaine type and the like are used.

Some of the examples of the surfactant compound which can be used as the antistatic agent are described in JP-A-60-28025, US Pat. Nos. 2,271,623, 2,224,472, and 22.
88226, 2676122, 2676924
Nos. 2,676,975, 2,691,566,27
27860, 2730498, 2742379
Nos. 2739891, 3068101, 31
No. 58484, No. 3201253, No. 32010191
Nos. 3,294,540, 3,415,649 and 34
No. 41413, No. 3444254, No. 3475174
No. 3,545,974, West German Patent Publication (OLS) 19
No. 42665, British Patent Nos. 1077317 and 1198
No. 450, Ryohei Oda et al., "Synthesis of Surfactants and Their Applications" (Maki Shoten, 1972 edition); W. "Surfes Active Age Entities" by Beili (Interscience Publication Corporation 1
985); P. Encyclopedia of Surfactive Agents, Vol. 2 (Chemical publishing company, 1964 edition) by Sisley; Surfactant Handbook, 6th printing (Sangyo Tosho Co., Ltd.,
December 20, 1966); Hideo Marumo, "Antistatic Agent"
Koshobo (1968) and the like.

These surfactants may be added alone or as a mixture. The amount of these surfactants used in the abrasive body is 0.01 to 10 parts by weight per 100 parts by weight of the abrasive. The amount used in the back layer is 10 binders.
It is 0.01 to 30 parts by weight per 0 parts by weight. These are used as antistatic agents, but are sometimes applied for other purposes such as improvement of dispersion, improvement of lubricity, coating aid, wetting agent, curing accelerator, and dispersion accelerator. .

As the organic solvent used in the dispersion, kneading and coating of the present invention, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone and tetrahydrofuran in any ratio; methanol, ethanol, propanol and butanol , Isobutyl alcohol, isopropyl alcohol, alcohols such as methylcyclohexanol; methyl acetate,
Ester systems such as ethyl acetate, butyl acetate, isobutyl acetate, isopropyl acetate, ethyl lactate and glycol monoethyl ether; ether systems such as diethyl ether, tetrahydrofuran, glycol dimethyl ether, glycol monoethyl ether and dioxane; benzene, toluene, xylene, Tar-based (aromatic hydrocarbons) such as cresol, chlorobenzene, and styrene; chlorinated hydrocarbons such as methylene chloride, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, and dichlorobenzene; NN-dimethylformaldehyde , Hexane and the like can be used. These solvents are generally used in two or more kinds at an arbitrary ratio. Further, a trace amount of impurities (polymer of the solvent itself, moisture, raw material components, etc.) may be contained in an amount of 1% by weight or less.

The polishing layer is formed by dissolving the above composition and the like in a solvent by arbitrarily combining the above-mentioned compositions and the like, coating the solution on a support as a coating solution,
dry. As the material of the support, polyethylene terephthalate, polyesters such as polyethylene naphthalate, polyolefins such as polypropylene, cellulose derivatives such as cellulose triacetate and cellulose diacetate, vinyl resins such as polyvinyl chloride,
In addition to plastics such as polycarbonate, polyimide, polyamide, and polysulfone, metals such as aluminum and copper, and ceramics such as glass can also be used. Prior to coating, these supports may be subjected to corona discharge treatment, plasma treatment, undercoating treatment, heat treatment, dust removal treatment, metal deposition treatment, and alkali treatment. For these supports,
For example, West German Patent 3338854A, Japanese Patent Laid-Open No. 59-116
No. 926, JP-A-61-129731, U.S. Pat.
No. 88368; Yukio Mitsuishi, Textile and Industry, vol. 31, p5
0-55, 1975, and the like. The center line average surface roughness of these supports is 0.001 to 0.5 μm
(Cutoff value 0.25 mm) is preferred. In addition, the Young's modulus (F5 value) of these supports is determined in the width direction,
100 to 1000 kg / mm ² (1 kg / mm)
m ² = 9.8 Pa) can be selected.

The method of dispersion and kneading is not particularly limited, and the order of addition of each component (resin, powder, lubricant, solvent, etc.)
The addition position during dispersion / kneading, the dispersion temperature (0 to 80 ° C.) and the like can be appropriately set. For preparation of the polishing coating, a usual kneading machine, for example, a two-roll mill, a three-roll mill, a ball mill, a pebble mill, a tron mill, a sand grinder, a Szegvari attritor, a high-speed impeller, a disperser, a high-speed stone mill, and a high-speed Impact mills, dispersers, kneaders, high-speed mixers, ribbon blenders, co-kneaders, intensive mixers,
Tumblers, blenders, dispersers, homogenizers, single-screw extruders, twin-screw extruders, and ultrasonic dispersers can be used.
Normally, a plurality of these dispersing / kneading machines are provided for dispersing / kneading,
Process continuously. For more information on kneading and dispersing technology,
T. C. PATTON (T.C.Patton) "P
aint Flow and Pigment Dis
version "(Paint Flow and Pigment Dispersion) 1964 John Wile
Published by y & Sons (John Wheelie and
Sands)) and Shinichi Tanaka, Industrial Materials, Vol. 25, 37 (19
77) and the cited reference of the book. As an auxiliary material for the dispersion and kneading, a steel ball, a steel bead, a ceramic bead, a glass bead, and an organic polymer bead having an equivalent sphere diameter of 10 cmφ to 0.05 mmφ can be used in order to efficiently promote the dispersion and kneading. These materials are not limited to spherical shapes. It is also described in specifications such as U.S. Patent Nos. 2,581,414 and 2,855,156. Also in the present invention, the coating liquid for the polishing layer can be prepared by kneading and dispersing according to the method described in the above-mentioned book or the literature cited therein.

As a method of applying the above-mentioned coating liquid for a polishing layer on a support, the viscosity of the coating liquid is adjusted to 1 to 20,000 centistokes (25 ° C.), and an air doctor coater, a blade coater, an air knife coater, a squeeze Coater, impregnated coater, reverse roll coater, transfer roll coater, gravure coater, kiss coater, cast coater, spray coater, rod coater, forward rotation roll coater, curtain coater, extrusion coater, bar coater, lip coater, etc. can be used, and other methods It is also possible to provide specific descriptions of these in “Coating Engineering” published by Asakura Shoten, pages 253 to 2
This is described in detail on page 77 (issued in 1963, 1963). When the polishing layer has a multilayer structure, simultaneous multilayer coating, sequential multilayer coating, or the like may be performed. These are described, for example, in JP-A-57-123532 and JP-B-62-2.
No. 37451, JP-A-59-142741,
This is disclosed in the specification of JP-A-59-165239.

The coating liquid applied on the support by such a method is dried at 20 ° C. (room temperature) to 130 ° C. in multiple stages, and the formed polishing layer is dried to a thickness of about 5 to 25 μm. . Then, calendering is performed to adjust the surface roughness of the surface of the polishing layer formed as described above to enhance smoothness. Preferably, at least one of the calender rolls in the calendering process is a metal roll, and the metal roll is pressurized in contact with the polishing layer surface. In addition, a heat-resistant plastic roll such as epoxy, polyimide, polyamide, or polyimide amide can be used for the calender roll, and the treatment can be performed between metal rolls. The processing temperature is preferably 40
~ 120 ° C, linear pressure is preferably 50 ~ 400Kg / cm,
The speed is between 5 and 500 m / min.

[0058] The above-mentioned production method is used for pretreatment of powder.
It is desirable that the steps of surface treatment, kneading / dispersing, coating / drying, smoothing treatment, heat treatment, EB treatment, ultraviolet curing treatment, surface polishing treatment, and winding up be performed continuously. These are described, for example, in Japanese Patent Publication No. 40-23625 and Japanese Patent Publication No. 39-2.
No. 8368, Japanese Patent Publication No. 47-38802, British Patent No. 1191424, Japanese Patent Publication No. 48-11336, JP-A-49-53631, JP-A-50-1120.
No. 05, JP-A-51-77303, JP-B-52-17
No. 404, JP-A-60-70532, JP-A-2-
No. 2,656,672, U.S. Pat. No. 3,473,960, U.S. Pat. No. 4,728,569, U.S. Pat. No. 4,746,542, and the like. The method disclosed in Japanese Patent Publication No. 41-13181 is considered to be a basic and important technique in this field.

The wound abrasive body is formed into an abrasive body such as an abrasive sheet having a predetermined shape by punching, cutting, or the like.
It is desirable to burnish and / or clean the abrasive body before or after performing these processes. Burnish polished body, specifically sapphire blade, razor blade,
Using a hard material such as a carbide material blade, diamond blade, or ceramic blade, the protruding portion of the polished surface is smoothed. The Mohs hardness of these materials is preferably 8 or more, but is not particularly limited as long as protrusions can be removed. The shape of these materials does not need to be a blade in particular, and shapes such as a square shape, a round shape, and a wheel (these materials may be provided around a rotating cylindrical shape) can be used. Cleaning of the abrasive body is performed by wiping the surface layer with a nonwoven fabric or the like for the purpose of removing surface dirt and excess lubricant. Examples of such wiping materials include various types of virgin manufactured by Japan Vilene Co., Ltd., Toraysee, Exaine manufactured by Toray Co., Ltd., Kimwipe (trade name), and various abrasives manufactured by Fuji Photo Film Co., Ltd. Tissue paper, such as nonwoven fabric made of rayon, nonwoven fabric made of acrylonitrile, and blended nonwoven fabric can be used. These are described, for example, in JP-B-46-39309.
No., JP-B-58-46768, JP-A-56-9042.
9, JP-B-58-46767, JP-A-63-259
No. 830, JP-A-1-201824 and the like.

The abrasive used in the present invention, the binder,
Additives (lubricants, dispersants, antistatic agents, surface treatment agents, carbon black, abrasives, light-blocking agents, antioxidants, antifungal agents, etc.), solvents and supports (undercoat layer, back layer, under back) (It may have a coating layer) or the production method thereof can be referred to the production method described in JP-B-56-26890 or the like.

[0061]

EXAMPLES Examples and comparative examples of the present invention will be shown below.
Evaluate its properties. In the examples, "parts" indicates "parts by weight".

<Examples 1 to 4> The following coating solution A for a polishing layer was uniformly kneaded and dispersed in a ball mill, the viscosity was adjusted, and a coating solution for a polishing layer mixed with a curing agent (polyisocyanate) was prepared. This coating solution is 1000 mm wide and 50 μm thick.
Was applied onto a support made of a polyester film (PET), and then dried to obtain a polished body having a polished layer having a dry coating film thickness of 15 μm. This abrasive body was punched into a disk shape to obtain a sample as an abrasive sheet.

In Examples 1 to 4, alumina having α crystal grains (primary particles) obtained by firing aluminum hydroxide was used as the polishing material X of the polishing layer, and aluminum hydroxide (average particle size: 3. 0 μm), and in each of Examples 1 to 4, the size of the α crystal grains of alumina (0.3 to 3.2 μm) and the average particle size of the secondary particles obtained by agglomeration (1.0 to 6.0 μm) were obtained. 5 μm).

The polishing bodies of Examples 1 to 4 were attached on the elastic body of the base, and a polishing test of the connector ferrule was performed. In this polishing test, the above-mentioned base is made to rotate in a planetary manner, and the rotation is 12 rpm and the revolution is 2 rpm.
Twelve connector ferrules were attached to the jig, and the tip surface was pressed against the surface of the polishing layer at a rate of 20 g / piece (total load 240 g) to perform polishing for 60 seconds. Water (or slurry) was dropped on the polishing layer as a polishing liquid.

Table 1 shows the results of measurement of the number of scratches on the optical fiber surface by the polishing test and the return loss of the optical fiber end surface after polishing. Table 1 shows the average particle size (size: μ) of the secondary particles of the alumina of Examples 1 to 4.
m), average particle size of α crystal grains (α particle size: μm), shape (shape) of primary particles, and blending amount (part) of aluminum hydroxide (abbreviated as aluminum hydroxide in the table) are doing.

The number of scratches on the fiber surface is the number of scratches in the quartz glass portion of the fiber end surface after polishing, and is a numerical value when an arbitrary number (five portions) is inspected with a 200 × optical microscope. Also, the return loss (dB)
Is a measurement of the loss of the amount of transmitted light caused by the reflection of the polished surface of the optical fiber. The smoothness of the surface can be evaluated. The input light amount is P2, and the output light amount is P-10.
/ P2), the smaller the dB value (the larger in the minus direction), the lower the reflection, the smaller the transmission loss, and the better the transmission state.

<Comparative Examples 1-3> Table 1 shows Comparative Examples 1-3.
The results of the same polishing test performed on the polishing body of Example 1 are also shown. In Comparative Examples 1 to 3, aluminum hydroxide was not added to the polishing layer, and alumina obtained by the crushing method was used as the abrasive X. In each of Comparative Examples 1 to 3, the average particle size of the secondary particles was Different as in Examples 1-3. Table 1 shows the secondary particle size (size: μm) and primary particle shape (shape) of the aluminas of Comparative Examples 1 to 3.

From the results shown in Table 1, it can be seen that in Examples 1 to 4 of the present invention, the polishing layer contains aluminum hydroxide, and the burned alumina having spherical α crystal grains is used as the polishing material. , No scratch on the fiber surface,
The return loss was also a small value, and good polishing was performed. On the other hand, in Comparative Examples 1 to 3, the polishing layer did not contain aluminum hydroxide and had low hydrophilicity, and the polished alumina having horns was used as the polishing material. Eight occurrences occur, and the return loss is in the above Examples 1 to
It is larger for 4 things.

[Polishing Layer Coating Composition: A] Abrasive: X 100 parts Aluminum hydroxide (average particle size: 3.0 μm) 20 parts Binder (vinyl chloride resin, MR110: manufactured by Zeon Corporation) 10 parts Binder ( Polyurethane resin containing sulfonic acid groups and epoxy groups 8 parts Binder (polyisocyanate) 8 parts Dioctyl sulfosuccinate sodium ester 0.5 parts Lecithin 1 part MEK (methyl ethyl ketone) / anone 150 parts MIBK / butyl acetate 50 parts

[0070]

[Table 1]

<Examples 5 to 8> The following polishing layer coating liquid composition B is uniformly kneaded and dispersed, the viscosity is adjusted, and a polishing layer coating liquid mixed with a curing agent (polyisocyanate) is prepared. This coating solution was applied to a 75 μm thick polyester film (P
After coating on a support by ET), it was dried to obtain a polished body in which a polished layer having a dry coating film thickness of 10 μm was formed.
This polished body was punched into a disk shape (diameter 100 mm) to obtain a sample as a polishing sheet.

In Examples 5 to 8, silica fine powder was used as the abrasive Y in the polishing layer and aluminum hydroxide was blended. In Examples 5 to 8, the average particle size of silica (0.4%) was used. To 3.0 μm).

The polishing bodies of Examples 5 to 8 were attached on the elastic body of the base, and a polishing test of the connector ferrule was performed. In this polishing test, the above-mentioned base is made to rotate in a planetary manner, and the rotation is 30 rpm, the revolution is 2 rpm,
Twelve connector ferrules were attached to a jig, and the tip surface was pressed into contact with the surface of the polishing layer at a rate of 20 g / piece (total load: 240 g) to perform polishing for 120 seconds. On the polishing layer, a silica slurry (aqueous solution containing silica having a particle diameter of 0.01 μm and having a concentration of 10%) was dropped as a polishing liquid.

Table 2 shows the results of measurement of the presence or absence of scratches on the optical fiber surface by the above-mentioned polishing test (no scratches: 、, scratches: X) and the return loss of the optical fiber end surface after polishing, together with the number of times of repeated use. Table 2 shows the average particle size of silica (size: μm) and the blending amount (parts) of aluminum hydroxide.

The measurement of the return loss is the same as that described above, and the number of times of repeated use is the number of times of use (the number of times of polishing) from the initial return loss until the return loss increases by +5 dB under the above polishing conditions, and indicates the durability.

<Comparative Examples 4 to 7> Table 2 shows Comparative Examples 4 to 7
The results of the same polishing test performed on the polishing body of Example 1 are also shown. In Comparative Examples 4 to 7, the polishing material Y of the polishing layer uses silica fine powder having the same average particle size as in Examples 5 to 8, but does not contain aluminum hydroxide. The silica fine powder is blended in an amount of 100 parts by weight including aluminum hydroxide.

From the results shown in Table 2, when the polishing layers according to Examples 5 to 8 of the present invention contained aluminum hydroxide, good results were obtained with respect to both the scratches on the fiber surface and the return loss. On the other hand, when the polishing layers of Comparative Examples 4 to 7 did not contain aluminum hydroxide, the fiber surface was not damaged, but the return loss was higher than that of Example 5 above.
~ 8. Regarding the number of times of use, almost the same results were obtained in Examples 5 to 8 and Comparative Examples 4 to 7.

[Composition of polishing layer coating liquid: B] Abrasive: Y 66 parts Aluminum hydroxide (average particle size: 3.0 μm) 34 parts Binder (polyester resin, CA118: manufactured by Morton) 40 parts Binder (polyurethane resin) Sulfonic acid group containing epoxy group) 30 parts Binder (polyisocyanate) 20 parts MEK (methyl ethyl ketone) / anone 150 parts Xylene / toluene 50 parts

[0079]

[Table 2]

<Examples 9 to 12> The following coating solution C for polishing layer was uniformly kneaded and dispersed, the viscosity was adjusted, and a coating solution for polishing layer mixed with a curing agent (polyisocyanate) was prepared.
This coating solution was applied on a support made of a 50 μm-thick polyester film (PET), and then dried to obtain a polished body having a 6 μm-thick dry coating film formed thereon. This polished body was punched into a disk shape (diameter 300 mm) to obtain a sample as a polishing sheet.

In Examples 9 to 12, a Z part of cerium oxide fine powder (average particle size: 2.0 μm) was blended as an abrasive for the polishing layer, and a W part of aluminum hydroxide (average particle size: 1 μm) was blended. In each of Examples 5 to 8
Are different in the mixing ratio of cerium oxide and aluminum hydroxide.

The polishing bodies of Examples 9 to 12 were affixed on the elastic body of the base, and a polishing test of the connector ferrule was performed. In this polishing test, the base was made to rotate in a planetary manner, the rotation was 30 rpm, the revolution was 2 rpm, and 12 connector ferrules were attached to a jig.
Polishing was performed for 60 seconds by bringing the tip end face into press contact with the polishing layer surface at 20 g / piece (total load 240 g). On the polishing layer, a silica slurry (aqueous solution containing silica having a particle diameter of 0.01 μm and having a concentration of 10%) was dropped as a polishing liquid. As a pretreatment (rough polishing), a diamond polished body (D4000) is used for 60 times.
Second polishing.

Table 3 shows the measurement results of the return loss of the end face of the optical fiber after polishing by the polishing test, together with the amount of grinding. Table 3 shows the amount of cerium oxide (Z
Parts), the blending amount of aluminum hydroxide (W part), and the weight ratio of both (Z / W).

The return loss was measured in the same manner as described above. The amount of grinding was determined by measuring the height of the end face of the optical fiber before and after polishing with a micrometer, and the difference was determined as the amount of grinding.

<Comparative Example 8> Table 3 also shows the results of a similar polishing test performed on the polished body of Comparative Example 8.
Comparative Example 8 uses the same cerium oxide (average particle size: 2.0 μm) as in Examples 9 to 12, but does not contain aluminum hydroxide.

From the results shown in Table 3, when the polishing layers according to Examples 9 to 12 of the present invention were mixed with cerium oxide and aluminum hydroxide, good results were obtained in both the return loss and the amount of grinding on the fiber surface. Was done. On the other hand, when the polishing layer of Comparative Example 8 contains cerium oxide and does not contain aluminum hydroxide, the return loss is larger than those of Examples 9 to 12, and the grinding amount is a low value. ing. In Examples 9 to 12, the smaller the mixing ratio of aluminum hydroxide to cerium oxide, the smaller the return loss and the greater the amount of grinding.

[Composition of Polishing Layer Coating Solution: C] Abrasive (cerium oxide, average particle size: 2.0 μm) Z portion Aluminum hydroxide (average particle size: 1 μm) W portion Binder (polyester resin, Byron: Toyobo Co., Ltd.) 40 parts Binder (containing polyurethane resin sulfonic acid group epoxy group) 30 parts Binder (polyisocyanate) 20 parts MEK (methyl ethyl ketone) / anone 150 parts Xylene / MIBK 50 parts

[0088]

[Table 3]

[Brief description of the drawings]

FIG. 1 is a front view conceptually showing a polished state of an optical fiber connector ferrule by a polishing body according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 abrasive body 2 support 3 polishing layer 5 connector ferrule for optical fiber 6 ferrule 7 optical fiber 10 base 11 elastic body 15 supply nozzle 16 polishing liquid

Claims (8)

[Claims] 1. A polishing body for polishing an end face of an optical fiber connector ferrule, comprising a support and a polishing layer applied thereon, wherein the polishing layer contains aluminum hydroxide, an abrasive, and a binder. Polished body characterized. 2. The abrasive and the aluminum hydroxide,
The abrasive body according to claim 1, wherein the average particle size is 0.1 to 50 m. 3. The polishing body according to claim 1, wherein the abrasive contains at least one of cerium oxide, alumina, chromium oxide, silicon carbide, diamond, and silica. 4. The polishing body according to claim 3, wherein the polishing material is alumina fine powder having α crystal grains produced by firing aluminum hydroxide. 5. The polishing body according to claim 4, wherein the average particle size of the α crystal grains of the alumina fine powder is 0.1 to 10 μm. 6. The polishing body according to claim 1, wherein a calender treatment is performed on a surface of the polishing layer. 7. The support has a thickness of 25 to 200 μm.
The abrasive body according to claim 1, wherein the abrasive body is a polyester. 8. A polishing body for polishing an end face of an optical fiber connector ferrule, wherein a polishing layer is coated on the support, wherein the polishing layer is formed of a metal hydroxide or a saturated metal oxide and an oxide. A polishing body comprising cerium and a binder.