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EP0546831B1 - Coated abrasive having a coating of an epoxy resin coatable from water - Google Patents

Coated abrasive having a coating of an epoxy resin coatable from water Download PDF

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Publication number
EP0546831B1
EP0546831B1 EP92311283A EP92311283A EP0546831B1 EP 0546831 B1 EP0546831 B1 EP 0546831B1 EP 92311283 A EP92311283 A EP 92311283A EP 92311283 A EP92311283 A EP 92311283A EP 0546831 B1 EP0546831 B1 EP 0546831B1
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EP
European Patent Office
Prior art keywords
coat
epoxy resin
make coat
water
make
Prior art date
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Expired - Lifetime
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EP92311283A
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German (de)
English (en)
French (fr)
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EP0546831A3 (en
EP0546831A2 (en
Inventor
Chong Soo c/o Minnesota Mining and Lee
Scott J. C/O Minnesota Mining And Buchanan
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3M Co
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Minnesota Mining and Manufacturing Co
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Publication date
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Publication of EP0546831A3 publication Critical patent/EP0546831A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/28—Resins or natural or synthetic macromolecular compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic

Definitions

  • This invention relates to a coated abrasive having a plurality of abrasive grains bonded to a backing by means of one or more binders, in particular a binder formed from an epoxy resin that is coatable from water.
  • Coated abrasives comprise a backing having abrasive grains bonded thereto by one or more binders.
  • These binders typically comprise a glutinous or resinous adhesive, and may optionally contain one or more additives.
  • resinous adhesives include epoxy resins, phenolic resins, urethane resins, acrylate resins, and aminoplast resins.
  • additives include fillers, grinding aids, wetting agents, dispersing agents, pigments, coupling agents, and dyes.
  • a grinding aid is included in the binder to improve the abrading characteristics of the coated abrasive. It is believed that the grinding aid has a significant effect on the chemical and physical processes of abrading, thereby providing improved performance.
  • Minnesota Mining and Manufacturing Company of St. Paul, Minnesota has manufactured Regalite Polycut (Trade Name) coated abrasives that contain an overcoating of an epoxy resin with a potassium tetrafluoroborate grinding aid dispersed in the epoxy resin.
  • the binders previously referred to are typically applied by coating from an organic solvent. There are several advantages in coating a resinous binder from an organic solvent, rather than from water.
  • the lower surface tension of organic solvents typically provides better wetting and better adhesion, lower viscosities, and better dispersions of the additives.
  • U.S. Patent No. 4,396,657 discloses a saturant for impregnating the multifilament yarns of a stitchbonded coated abrasive backing comprising an epoxy resin, a dicyandiamide, blocked isocyanates, and/or imidazole curing agents.
  • the epoxy resin is capable of being coated from water.
  • U.S. Patent No. 3,615,303 discloses a treatment for the backing of a coated abrasive.
  • the treatment referred to as an intermediate layer, comprises an epoxide resin mixture based on (a) 4,4'-dihydroxydiphenyl1-2, 2-propane (Bisphenol A), (b) an epoxide resin based on Bisphenol A internally plasticized by a reaction with castor oil, (c) carbamic acid alkyl esters, and (d) a curing agent.
  • This epoxide resin is capable of being coated from water.
  • EP-A-486,308 (of the same applicant as the present application), priority date November 14th, 1990, published May 20th, 1992 (Article 54(3)) discloses a coated abrasive wherein a size coat must contain an epoxy resin coatable from water and a grinding aid.
  • the make coat is preferably a phenolic resin but there is incidental reference to possible use of an epoxy resin coatable from water without specification of the nature of such resin.
  • a coated abrasive article comprising:
  • Epoxy equivalent weight is the average molecular weight of the resin divided by the average number of epoxy functional groups per molecule.
  • the purpose of the curing agent is to initiate polymerization of the epoxy resin, which is the resinous adhesive in the binder.
  • the purpose of the grinding aid is to improve the abrading characteristics of the coated abrasive. Examples of typical grinding aids include potassium tetrafluoroborate and cryolite.
  • the weight ratio of the epoxy resin to the grinding aid ranges from 10 to 85 parts epoxy resin to 15 to 85 parts grinding aid.
  • the coat containing the epoxy resin and the grinding aid be the outermost coat of the coated abrasive article in order to position the grinding aid in direct contact with the workpiece being abraded.
  • FIG. 1 is a side view of a coated abrasive made according to the present invention.
  • FIG. 2 is a side view of a coated abrasive made according to the present invention.
  • epoxy resin refers to epoxy resins capable of being coated from water unless indicated otherwise;
  • epoxy dispersion refers to a dispersion containing an epoxy resin, an emulsifier for the epoxy resin, a curing agent for the epoxy resin, and water.
  • FIGS. 1 and 2 depict embodiments subject to the limitation in the claims wherein at least one of the make coat, size coat, or optional supersize coat is formed from a composition comprising an epoxy resin, an emulsifier for the epoxy resin, a curing agent, and water.
  • the size coat or supersize coat or both coats contain, in addition to the epoxy resin, the emulsifier for the epoxy resins, and the curing agent, a grinding aid. Grinding aids are particularly useful in coarse grade abrasives that are used for abrading metals.
  • coated abrasive 10 comprises a backing 12 and a plurality of abrasive grains 14 supported by and adherently bonded to backing 12 by means of a binder 16, hereafter referred to as the make coat. Overlying abrasive grains 14 and make coat 16 is a binder 18, hereafter referred to as the size coat. Size coat 18 further secures abrasive grains 14 to backing 12.
  • the size coat subject to the limitations in the claims can be prepared from a composition comprising an epoxy resin, an emulsifier for the epoxy resin, a curing agent, a grinding aid, and water. In this particular embodiment, the size coat is the outermost coating of the coated abrasive, and it can directly contact the workpiece being abraded.
  • coated abrasive 20 comprises a backing 22 and a plurality of abrasive grains 24 supported by and adherently bonded to backing 22 by means of a binder 26, hereafter referred to as the make coat. Overlying the abrasive grains 24 and make coat 26 is a binder 28, hereinafter referred to as the size coat. Coated abrasive 20 further comprises supersize coat 30 overlying size coat 28.
  • supersize coat 30 can be formed from a composition comprising an epoxy resin, an emulsifier for the epoxy resin, a curing agent, a grinding aid, and water.
  • the supersize coat is the outermost coating of the coated abrasive, and it can directly contact the workpiece being abraded. It is also acceptable for both size coat 28 and supersize coat 30 to be formed from a composition comprising an epoxy resin, an emulsifier for the epoxy resin, a curing agent, a grinding aid, and water.
  • Backings 12 and 22 are preferably selected from materials that can be formed into sheets, such as paper, cloth, polymers, nonwoven materials, e.g., an open, porous non-woven web, vulcanized fibre, combinations thereof, and treated versions thereof.
  • Abrasive grains 14 and 24 are preferably selected from such abrasive materials as silicon carbide, fused aluminum oxide, heat-treated aluminum oxide, garnet, alumina zirconia, ceramic aluminum oxide, diamond, cubic boron nitride, and combinations thereof.
  • Make coats, size coats, and supersize coats not formed from the epoxy dispersion can be formed from a glutinous or resinous adhesive, and they may also contain other additives.
  • resinous adhesives suitable for preparing make coats, size coats, and supersize coats include phenolic resins, urea formaldehyde resins, epoxy resins not coatable from water, urethane resins, acrylate resins, aminoplast resins, melamine resins, and mixtures thereof.
  • Additives suitable for make coats, size coats, and supersize coats include wetting agents, grinding aids, fillers, coupling agents, dyes, pigments, antistatic agents, and combinations thereof.
  • Epoxy resin contains an oxirane ring, i.e., The epoxy resin is polymerized or cured by means of a ring opening mechanism.
  • Epoxy resins suitable for this invention must be coatable from water.
  • Epoxy resins suitable for this invention include both monomeric epoxy compounds and polymeric epoxy compounds.
  • the epoxy resins may vary greatly in the nature of their backbones and their substituent groups; for example, their backbones can be aliphatic, cycloaliphatic, or aromatic.
  • a representative example of an aliphatic epoxy resin is diglycidyl ether of a polyoxyalkylene glycol.
  • cycloaliphatic epoxy resins include epoxycyclohexanecarboxylates, e.g., 3,4-epoxy-2-methylcyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, and 3,4-epoxy-2-methylcyclohexylmethyl 3,4-epoxy-2-methylcyclohexanecarboxylate.
  • aromatic epoxy resins include 3,3-bis[4-(2,3-epoxypropoxy)-phenyl]propane (diglycidyl ether of bisphenol A), N,N,N,N'-tetraglycidyl-4,4'-diaminodiphenylmethane, and triglycidyl-p-aminophenol.
  • the backbone of the epoxy resin can be modified with organic substituents, such as, for example, a urethane epoxy resin.
  • the addition of the urethane group to the epoxy backbone can increase the flexibility of the resulting cured binder. In some instances, e.g., with respect to fine grade coated abrasive products, flexibility provides some advantages.
  • the preferred epoxy resin for the size coat or supersize coat is a diglycidyl ether of bisphenol A.
  • n can range from 0 to 10, but it preferably ranges from 1 to 4. As the value of n increases, the viscosity of the resin also increases. If the viscosity of the resin is too high, it will be difficult to apply as a coating.
  • Another type of epoxy resin is a novolac resin, which is illustrated below.
  • n' can range from 0 to 4, preferably from 0.2 to 2. The higher values of n' result in a more viscous resin.
  • the epoxide equivalent weight (EEW) can range from 160 to 700. For the make coat, it is required that this equivalent weight be 160 to 500, preferably in the range of 165 to 350 and most preferably in the range of 180 to 250.
  • a make coat that is formed from an epoxy composition having a higher EEW tends to solidify too fast. Excessively rapid solidification tends to result in poor adhesion of the abrasive grains to the make coat.
  • the make coat formed from the epoxy dispersion having the higher EEW has to be heated prior to the application of the abrasive grains to inhibit solidification of the make coat.
  • steam can be applied to the surface of the make coat to resoften the surface to inhibit solidification of the make coat to allow the abrasive grains to adhere properly.
  • the preferred EEW for a size coat or supersize coat formed from an epoxy dispersion is typically in the range of 200 to 700.
  • the pH of the epoxy resin by itself, can range from 3 to 8.5, preferably from 3.5 to 8.
  • Examples of commercially available epoxy resins suitable for this invention include the CMD series or "EPI-REZ" (Trade Mark) series epoxy resins from Rhone-Poulenc, Louisville, Kentucky.
  • the epoxy resin is dispersed in water with the aid of an emulsifier to form a dispersion, hereafter referred to as "epoxy dispersion".
  • the epoxy dispersion will contain from 30 to 90% solids, preferably 45% to 75% solids.
  • Emulsifiers that are suitable for preparing the epoxy dispersion include cationic, anionic, and nonionic emulsifiers. Cationic dispersions result in a positive charge on the resin particle or on the emulsifier, whereas anionic dispersions provide negative charges. Nonionic dispersions do not have charges associated with them. Nonionic emulsifiers are preferred.
  • emulsifiers suitable for this invention include sodium dioctyl sulfosuccinate, alcohol ethoxylates, and alcohol alkoxylates.
  • a curing agent can then be added to the epoxy dispersion. The purpose of the curing agent is to initiate the polymerization of the epoxy resin after the composition has been coated so that a thermosetting, chemical resistant polymer will be formed.
  • the epoxy dispersion contains from 0.01 to 30% by weight curing agent, preferably 1 to 5% by weight curing agent, based upon the weight of the epoxy resin.
  • curing agents suitable for the epoxy resins of this invention include amines, such as polyamidoamines and tertiary amines, amides such as dicyandiamide, mercaptans, and imidazoles, such as 2-methyl imidazole, 2-phenyl imidazole, and 2-ethyl-4-methylimidazole.
  • the preferred curing agent is 2-ethyl-4-methylimidazole, commercially available from Air Products Company under the trade designation "EMI-24". It is also preferred that the curing agent be dispersed in water prior to being added to the epoxy dispersion.
  • Other useful curing agents for the epoxy resin include urea-formaldehyde resins and melamine formaldehyde resins.
  • urea-formaldehyde resins examples include "DURITE AL 8401" and “DURITE AL 8405" (Trade Marks) resins, available from the Borden Chemical Co.
  • the weight ratio of epoxy resin to urea-formaldehyde resin typically ranges from 40 to 80 parts epoxy resin to 20 to 60 parts urea-formaldehyde resin.
  • an epoxy dispersion for preparing the size coat or supersize coat may also contain a grinding aid, particularly for coated abrasives containing coarse to medium grade abrasive grains.
  • grinding aids are particulate materials, the addition of which to a coated abrasive article enhances the abrading performance of the coated abrasive article. It is believed that the grinding aid exercises a significant effect on the chemical and physical processes encountered during abrading, thereby providing improved performance. In particular, it is believed that the grinding aid will carry out one or more of the following:
  • Classes of grinding aids suitable for this invention include waxes, organic halide compounds, halide salts, metals, and alloys of metals.
  • Organic halide compounds typically break down during abrading and release a halogen acid or a gaseous halide compound.
  • Examples of organic halides include chlorinated waxes, such as tetrachloronaphthalene, pentachloronaphthalene; and polyvinyl chloride. Chlorinated waxes can also be considered to be waxes.
  • halide salts include sodium chloride (NaCl), potassium chloride (KCl), potassium fluoroborate (KBF 4 ), ammonium cryolite (NH 4 ) 3 AlF 6 , cryolite (Na 3 AlF 6 ), and magnesium chloride (MgCl 2 ).
  • metals include tin, lead, bismuth, cobalt, antimony, cadmium, iron, and titanium.
  • Other grinding aids include sulfur and organic sulfur compounds, graphite, and metallic sulfides. Combinations of grinding aids can be used, and in some instances may produce a synergistic effect.
  • the preferred grinding aid for stainless steel is potassium tetrafluoroborate.
  • the preferred grinding aid for mild steel is cryolite.
  • the ratio of epoxy resin to grinding aid preferably ranges from 10 to 85, preferably 15 to 60, parts by weight epoxy resin to 15 to 85, preferably 40 to 85, parts by weight grinding aid.
  • a dispersing agent to the epoxy dispersion.
  • a dispersing agent for example, if potassium tetrafluoroborate is used as a grinding aid, it is preferred to add a dispersing agent to the epoxy dispersion to lower its viscosity.
  • cryolite is used as a grinding aid, it is not always necessary to add a dispersing agent to the epoxy dispersion.
  • Representative examples of commercially available dispersing agents suitable for this invention include fluorosurfactants having the trademarks of "FLUORAD", available from Minnesota Mining and Manufacturing Company, St. Paul, Minnesota, and "AEROSOL OT", available from Rohm & Haas Company.
  • the concentration of the dispersing agent is less than 2%, based on the weight of the epoxy resin.
  • the viscosity of the composition containing epoxy resin, emulsifier, curing agent, and water should be less than 10000 mPa (10,000 centipoises), preferably less than 5000 mPa (5,000 centipoises). If the viscosity is greater than 30000 mPa (30,000 centipoises), it is difficult to process the composition in the manufacture of a coated abrasive.
  • resins can also be included in the epoxy dispersion.
  • phenolic resins which can co-react with the epoxy resin, can be included.
  • urethanes and rubber compounds can be added to the dispersion in order to improve the toughness of the cured epoxy resin.
  • Latexes can be added to the epoxy dispersion to increase the flexibility of the cured binder.
  • additives such as dyes, defoamers, pigments, fillers, and coupling agents, can be used in the composition for preparing the size coat or supersize coat of this invention.
  • additives such as dyes, defoamers, pigments, fillers, and coupling agents.
  • make coats 16 and 26 can also be prepared from compositions comprising an epoxy resin coatable from water, an emulsifier for the epoxy resin, a curing agent, a grinding aid, and water.
  • the epoxy dispersion Once the epoxy dispersion has been applied to the coated abrasive article, it can be heated to bring about polymerization of the epoxy resin. Heating is typically conducted for a period of from 10 to 250 minutes, preferably from 20 to 50 minutes, at temperatures from 80 to 130°C, preferably from 105 to 115°C.
  • the abrading performance of a coated abrasive containing an epoxy resin of this invention is significantly improved over that of a coated abrasive containing an epoxy resin coated from an organic solvent, with everything else being equal. Furthermore, it has been found that the performance of the coated abrasive containing the epoxy resin of this invention does not decrease over time as rapidly as does that of a coated abrasive containing an epoxy resin coated from an organic solvent.
  • the advantages of utilizing the epoxy resin of this invention rather than epoxy resins coated from an organic solvent include reduction of pollution, greater ease of cleaning from the coating station, and greater ease of roll coating onto the surface of the coated abrasive.
  • the coated abrasive article was converted into a 10.2 cm diameter disc and secured to a foam back up pad by means of a pressure-sensitive adhesive.
  • the coated abrasive disc and back up pad assembly were installed on a Schiefer testing machine and the coated abrasive disc was used to abrade a workpiece made of polymethyl methacrylate ("PLEXIGLASS").
  • the load was 4.5 kg. All of the testing was done under conditions of a water flood.
  • the cut was the total amount of polymethyl methacrylate removed during 500 rotations of the coated abrasive disc. Additionally, the cut data represented an average for two coated abrasive discs.
  • a make coat that consisted of 65.7 g of PFAW, 8.08 g of AA, and 26.22 g of water was prepared. The percentage of solids was 45%.
  • the make coat was knife coated onto a waterproof A weight paper at a dry weight of approximately 4 g/m 2 .
  • the make coat was dried in air for about three minutes.
  • grade P320 silicon carbide was electrostatically projected into the make coat at a weight of approximately 40 g/m 2 .
  • the resulting construction was cured for five minutes at a temperature of 100°C.
  • a size coat was applied over the abrasive grains at a weight of about 36 g/m 2 .
  • the size coat was of the same composition as the make coat, except that the percentage of solids was 40%.
  • the resulting construction was cured for about 20 minutes at a temperature of 100°C.
  • the coated abrasive article for Example 1 was made in the same manner as was used in Example 1 , except that the weight of the size coat was 44 g/m 2 .
  • the coated abrasive article for Comparative Example A was a grade 320 "3M 413Q IMPERIAL WETORDRY” A weight paper commercially available from the Minnesota Mining and Manufacturing Company, St. Paul, Minnesota.
  • the abrasive grains were silicon carbide.
  • the coated abrasive article for Comparative Example B was a grade 320 "3M 213Q IMPERIAL WETORDRY" A weight paper commercially available from the Minnesota Mining and Manufacturing Company, St. Paul, Minnesota.
  • the abrasive grains were aluminum oxide.
  • the coated abrasive article for Comparative Example C was a grade 320 coated abrasive article that employed a waterproof A weight paper, and was commercially available from the Komatsubara Company, Japan.
  • the abrasive grains were silicon carbide.
  • Example 2 performed better than the articles of Comparative Examples A, B and C.
  • the coated abrasive article in Example 3 used a make coat and a size coat that were formed from an epoxy dispersion. All of the coated abrasive articles in this set of examples were tested according to the Schiefer Test, and the test results are set forth in Table II. In addition, for this set of examples, the surface finish of the workpiece was measured at the end of the 500 cycles by a Type M4P Perthometer. Ra is the arithmetic mean of the departures of the profile from the mean line in nm (microinches) and Rtm is the mean of the maximum peak-to-valley values from each of five consecutive sampling lengths in nm (microinches).
  • a make coat precursor that consisted of PFAW (1,005 g) of AA (1,230 g), silicone surfactant (15 g) and water (3,990 g) was prepared.
  • PFAW had a pH of 7.0, contained 57% solids, and had an epoxy equivalent weight of approximately 205.
  • AA contained about 100% solids.
  • This make coat precursor was roll coated onto a waterproof A weight paper at a wet weight of approximately 4 g/m 2 . Then, grade 1200 silicon carbide was electrostatically projected into the make coat at a weight of approximately 11 g/m 2 . The resulting construction was cured for 10 minutes at a temperature of 120°C.
  • a size coat was applied over the abrasive grains at a weight of about 9 g/m 2 .
  • the size coat was of the same material as the make coat.
  • the resulting construction was cured for between 15 to 20 minutes at a temperature of 120°C.
  • the coated abrasive article of Example 4 was made in the same manner as was that of Example 3 except that the abrasive grain was a grade 600 silicon carbide.
  • the weights of the make coat, abrasive grain, and size coat were about 2, 10 and 17 g/m 2 , respectively.
  • the coated abrasive article in Example 5 was made in the same manner as was that of Example 3 except that the abrasive grain was a grade 400 silicon carbide.
  • the weight of the make coat, abrasive grain, and size coat were about 5, 18 and 15 g/m 2 , respectively.
  • the coated abrasive article for Comparative Example D was a grade 1200 "IMPERIAL MICROFINE" A weight paper commercially available from Minnesota Mining and Manufacturing Company, St. Paul, Minnesota.
  • the coated abrasive article for Comparative Example E was a grade 1200 waterproofed coated abrasive A weight paper commercially available from the Komatsubara Company, Japan under the trade designation "KOVAX”.
  • the coated abrasive article for Comparative Example F was a grade 1200 coated abrasive that contained a waterproof A weight paper.
  • Comparative Example L was commercially available from the Nikken Company, Japan.
  • the coated abrasive article for Comparative Example G was a grade 600 waterproofed coated abrasive A weight paper commercially available from the Komatsubara Company, Japan under the trade designation "KOVAX”.
  • the coated abrasive article for Comparative Example H was a grade 400 waterproofed coated abrasive A weight paper commercially available from the Komatsubara Company, Japan under the trade designation "KOVAX”.
  • Table II Example No. Cut (g) Ra Rtm nm ⁇ m nm ⁇ m 3 0.730 101.6 004 838.2 033 4 1.011 203.2 008 1676.2 066 5 1.098 330.2 013 2514.6 099 Comparative D 0.302 76.2 003 685.8 027 Comparative E 0.814 177.8 007 1397 055 Comparative F 0.636 127 005 1168.4 046 Comparative G 1.243 482.6 019 3175 125 Comparative H 1.433 533.4 021 3810 150
  • cut and finish need to be balanced.
  • the present invention provides this balance by providing a high cut with a low

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP92311283A 1991-12-11 1992-12-10 Coated abrasive having a coating of an epoxy resin coatable from water Expired - Lifetime EP0546831B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80496891A 1991-12-11 1991-12-11
US804968 1991-12-11

Publications (3)

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EP0546831A2 EP0546831A2 (en) 1993-06-16
EP0546831A3 EP0546831A3 (en) 1993-08-18
EP0546831B1 true EP0546831B1 (en) 1997-01-22

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EP92311283A Expired - Lifetime EP0546831B1 (en) 1991-12-11 1992-12-10 Coated abrasive having a coating of an epoxy resin coatable from water

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EP (1) EP0546831B1 (es)
JP (1) JPH05261666A (es)
KR (1) KR930012202A (es)
AU (2) AU656640B2 (es)
BR (1) BR9204977A (es)
DE (1) DE69217019T2 (es)
MX (1) MX9207000A (es)

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* Cited by examiner, † Cited by third party
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CN100478137C (zh) * 2006-03-31 2009-04-15 厦门致力金刚石工具有限公司 一种砂布及其制造方法
US7591865B2 (en) 2005-01-28 2009-09-22 Saint-Gobain Abrasives, Inc. Method of forming structured abrasive article
US7947097B2 (en) 2006-12-21 2011-05-24 Saint-Gobain Abrasives, Inc. Low corrosion abrasive articles and methods for forming same
US8287611B2 (en) 2005-01-28 2012-10-16 Saint-Gobain Abrasives, Inc. Abrasive articles and methods for making same
US8435098B2 (en) 2006-01-27 2013-05-07 Saint-Gobain Abrasives, Inc. Abrasive article with cured backsize layer

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* Cited by examiner, † Cited by third party
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US6843815B1 (en) * 2003-09-04 2005-01-18 3M Innovative Properties Company Coated abrasive articles and method of abrading
CN106368134A (zh) * 2016-09-23 2017-02-01 广东省建筑科学研究院集团股份有限公司 一种特殊路段路面安全改造用反光超薄层及其施工方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3615303A (en) * 1968-10-18 1971-10-26 Reichhold Albert Chemie Ag Coated abrasive article
US3998771A (en) * 1975-04-11 1976-12-21 Mobil Oil Corporation Water-based epoxy resin zinc-rich coating compositions
DE2657881A1 (de) * 1976-12-21 1978-06-22 Sia Schweizer Schmirgel & Schl Schleifmittel
US4751138A (en) * 1986-08-11 1988-06-14 Minnesota Mining And Manufacturing Company Coated abrasive having radiation curable binder
US4997717A (en) * 1987-03-27 1991-03-05 Ciba-Geigy Corporation Photocurable abrasives
EP0284064B1 (de) * 1987-03-27 1995-01-04 Ciba-Geigy Ag Photohärtbare Schleifmittel
US5061294A (en) * 1989-05-15 1991-10-29 Minnesota Mining And Manufacturing Company Abrasive article with conductive, doped, conjugated, polymer coat and method of making same
CA2054554A1 (en) * 1990-11-14 1992-05-15 Chong Soo Lee Coated abrasive having an overcoating of an epoxy resin coatable from water and a grinding aid
US5256170A (en) * 1992-01-22 1993-10-26 Minnesota Mining And Manufacturing Company Coated abrasive article and method of making same
US5368618A (en) * 1992-01-22 1994-11-29 Minnesota Mining And Manufacturing Company Method of making a coated abrasive article

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7591865B2 (en) 2005-01-28 2009-09-22 Saint-Gobain Abrasives, Inc. Method of forming structured abrasive article
US8287611B2 (en) 2005-01-28 2012-10-16 Saint-Gobain Abrasives, Inc. Abrasive articles and methods for making same
US8628596B2 (en) 2005-01-28 2014-01-14 Saint-Gobain Abrasives, Inc. Method of forming structured abrasive article
US8435098B2 (en) 2006-01-27 2013-05-07 Saint-Gobain Abrasives, Inc. Abrasive article with cured backsize layer
CN100478137C (zh) * 2006-03-31 2009-04-15 厦门致力金刚石工具有限公司 一种砂布及其制造方法
US7947097B2 (en) 2006-12-21 2011-05-24 Saint-Gobain Abrasives, Inc. Low corrosion abrasive articles and methods for forming same

Also Published As

Publication number Publication date
AU2977392A (en) 1993-06-17
DE69217019T2 (de) 1997-07-03
JPH05261666A (ja) 1993-10-12
EP0546831A3 (en) 1993-08-18
KR930012202A (ko) 1993-07-20
DE69217019D1 (de) 1997-03-06
AU656640B2 (en) 1995-02-09
MX9207000A (es) 1993-06-01
AU7894294A (en) 1995-01-27
AU669825B2 (en) 1996-06-20
BR9204977A (pt) 1993-06-15
EP0546831A2 (en) 1993-06-16

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