EP1373355A2 - Articles abrasifs contenant un polymere - Google Patents

Articles abrasifs contenant un polymere

Info

Publication number
EP1373355A2
EP1373355A2 EP01994481A EP01994481A EP1373355A2 EP 1373355 A2 EP1373355 A2 EP 1373355A2 EP 01994481 A EP01994481 A EP 01994481A EP 01994481 A EP01994481 A EP 01994481A EP 1373355 A2 EP1373355 A2 EP 1373355A2
Authority
EP
European Patent Office
Prior art keywords
article
coat
composition
meth
acrylate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01994481A
Other languages
German (de)
English (en)
Inventor
Don H. Kincaid
Ernest L. Thurber
Gregg D. Dahlke
Chad R. Wold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of EP1373355A2 publication Critical patent/EP1373355A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D11/00—Constructional features of flexible abrasive materials; Special features in the manufacture of such materials
    • B24D11/001—Manufacture of flexible abrasive materials
    • B24D11/005—Making abrasive webs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/10—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers containing more than one epoxy radical per molecule

Definitions

  • This invention relates to abrasive articles and methods of making abrasive articles having a polymeric material that includes (1) a reaction product of components that include (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (rneth)acrylate; and/or (2) a polymeric material preparable by combining at least (a) an epoxy-functional material, (b)'at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • abrasive product A variety of abrasive product are known in the art, including coated abrasive articles, lapping abrasive articles (is a "lapping abrasive article” a type of “coated abrasive article") and non-woven articles.
  • Coated abrasives generally include a backing having a plurality of abrasive particles bonded to at least one major surface thereof by one or more binders (for example, make, size, and supersize coats).
  • the abrasive particles are secured to the backing by a first binder, commonly referred to as a make coat.
  • a second binder commonly referred to as a size coat
  • a size coat is then generally applied over the make coat and the abrasive particles to anchor the particles to the backing.
  • a third layer commonly referred to as supersize layer is applied over the size coat to provide a functional coating.
  • the abrasive particles are generally oriented with their longest dimension perpendicular to the backing to provide an optimum cut rate.
  • Common make and size layers include those made from thermally curable binders include phenolic resins (for example, resol phenolic resin), urea-formaldehyde resins, urethane resins, melamine-formaldehyde resins, epoxy resins, and alkyd resins.
  • Porous backings such as woven cloth, non-woven materials, stitch bonded cloth, felt, and paper are frequently used in coated abrasive articles.
  • the make coat precursor is generally applied to the backing as a low viscosity material. In this condition, the make coat precursor can infiltrate into the interstices of the porous backing leaving an insufficient coating thickness making it difficult to bond the subsequently applied abrasive I particles to the backing and, on curing, resulting in the backing becoming hard and brittle.
  • the presize coat, saturant coat, backsize coat, and subsize coat generally include thermally curable resinous adhesives, including, for example, phenolic resins, epoxy- functional materials, (meth)acrylate resins, latices (for example, acrylic latices), urethane resins, glue, and starch.
  • a saturant coat saturates the porous backing and fills pores, resulting in a less porous, stiffer backing with more body. An increase in body provides an increase in strength and durability of the article.
  • a presize coat, which is applied to the front side of the backing, that is, the side to which the abrasive grits are applied, may add bulk to the backing and/or may improve adhesion of subsequent coatings.
  • a backsize coat which is applied to the back side of the backing, that is, the side opposite that to which the abrasive grits are applied, may add body to the backing and protect the backing from wear.
  • a subsize coat is similar to a saturant coat except that it is applied to a backing that already has saturant coat thereon to fill or smooth out the coating.
  • Nonwoven abrasive products preferably include an open porous lofty polymer filament structure having abrasive particles distributed throughout the structure and adherently bonded therein by an organic binder.
  • filaments include polyester fibers, polya ide fibers, and polyaramid fibers.
  • thermosetting polymeric materials that provide abrasive articles with improved properties.
  • the present invention provides an abrasive article including a polymeric material that includes a reaction product of components including (a) an epoxy- functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the article further includes a backing having a major surface and an abrasive layer secured to the major surface, wherein the abrasive layer includes a plurality of abrasive grits and a polymeric material that includes a reaction product of components including (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the polymeric material provides at least one of a make coat, a size coat, a slurry coat, a presize coat, a saturant coat, a backsize coat, a subsize coat, and a supersize coat.
  • the present invention provides an abrasive article including a polymeric material preparable by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the article further includes a backing having a major surface and an abrasive layer secured to the major surface, wherein the abrasive layer includes a plurality of abrasive grits and a polymeric material preparable by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the polymeric material provides at least one of a make coat, a size coat, a slurry coat, a presize coat, a saturant coat, a backsize coat, a subsize coat, and a supersize coat.
  • the present invention provides a method of making an abrasive article including providing a backing having a major surface, the major surface having thereon a composition preparable by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate; irradiating at least a portion of the composition to provide an irradiated composition; and thermally curing at least a portion of the irradiated composition to provide a coated abrasive article.
  • the present invention provides a nonwoven abrasive article including a polymeric material that includes a reaction product of components including (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the article further includes a nonwoven web having thereon the polymeric material and a plurality of abrasive grits.
  • the present invention provides a nonwoven abrasive article including a polymeric material preparable by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the article further includes a nonwoven web having thereon the polymeric, material and a plurality of abrasive grits.
  • the present invention provides a method of making a nonwoven abrasive article including providing a nonwoven web having thereon a plurality of I abrasive grits and a composition preparable by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate; and at least partially curing at least a portion of the composition to provide a nonwoven abrasive article.
  • the method includes irradiating at least a portion of the composition.
  • the method includes thermally curing at least a portion of the composition.
  • Epoxy-functional materials and polyfunctional (meth)acrylates are more hydrophobic than standard phenolic-formaldehyde resins, which are useful for providing coatings for coated abrasive articles.
  • compositions according to the present invention may provide a make coat, a size coat, a presize coat, a saturant coat, a backsize coat, a subsize coat, or a supersize coat with improved grinding performance in comparison to conventional phenol-formaldehyde compositions as described herein.
  • the epoxy-functional material contributes, in certain embodiments of the invention, to improved wetting properties.
  • the cyclic anhydride component in certain embodiments of the invention may contribute to improved adhesion between the backing having at least one coating thereon and the abrasive layer as measured according to the 90° Peel Adhesion test described later herein.
  • a polyfunctional (rneth)acrylate serves as a rheological modifier to the composition, which preferably allows for better control of the penetration of the composition into the backing and orientation of abrasive grits in the make coat.
  • binder precursor means any material that is conformable or can be made to be conformable by heat or pressure or both and that can be rendered non- conformable by means of radiation energy or thermal energy or both.
  • a binder precursor may include the polymeric material according to the present invention and optional materials including abrasive grits, fillers, and grinding aids.
  • binder refers to a solidified, handleable material.
  • the binder is formed from reaction of a binder precursor to provide a material (for example, particles) that will not substantially flow or experience a substantial change in shape.
  • the expression “binder” does not require that the binder precursor is fully reacted (for example, polymerized or cured), only that it is sufficiently reacted, for example, to allow I removal thereof from the production tool while the production tool continues to move, without leading to substantial change in shape of the binder.
  • Figure 1 illustrates a side view of an embodiment of a coated abrasive article according to the present invention.
  • Figure 2 illustrates a side view of another embodiment of a coated abrasive article according to the present invention.
  • Figure 3 illustrates a cross section of an embodiment of a nonwoven abrasive article according to the present invention.
  • flexible abrasive article according to the present invention which is a coated flexible abrasive article, has a cloth substrate 12.
  • the cloth substrate 12 has been saturated with a saturant coat 11.
  • a subsize coat may be applied to either side of a backing that already has a saturant coat thereon, one embodiment of which is illustrated as subsize coat 20.
  • the cloth substrate 12 has been treated with an optional first backsize coat 13 on one side and an optional presize coat 15 on the opposite side. There is no clear line of demarcation between the backsize coat 13 and the presize coat 15 which preferably meet in the interior of the cloth backing. In some instances it may be desirable that a second backsize coat 14 be applied over the first backsize coat 13.
  • a make coat 16 in which are embedded abrasive grits 18.
  • a size coat 17 has been placed over the make coat 16 and the abrasive i grits 18.
  • a second size coat commonly referred to as a supersize coat 19, applied over the size coat 17.
  • the supersize coat may include a resinous adhesive and a grinding aid.
  • the supersize coat may include a loading resistant coating such as zinc stearate which prevents the coated abrasive from filling with the paint that has been abraded.
  • Figure 2 illustrates a side view of another embodiment of a slurry coated abrasive article according to the present invention.
  • the coated abrasive article is illustrated as a lapping flexible abrasive article generally indicated as 30 which is formed on a paper substrate 37.
  • an abrasive coating 316 including a plurality of abrasive grits 38 distributed throughout slurry coat 39.
  • Figure 3 illustrates an embodiment of a nonwoven flexible abrasive article according to the present invention generally indicated as 40.
  • abrasive grits 42 distributed throughout an open, porous, polymer filament substrate 41.
  • the abrasive grits 42 are secured to the nonwoven substrate by means of a make coat.
  • Polymeric materials useful for making abrasive articles according to the present invention include (1) a reaction product of components that include (a) an epoxy- functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate; and or (2) a polymeric material preparable by combining at least (a) an epoxy-functional material, (b) at least one of. a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • One or more polymeric materials may be used to make abrasive articles according to the present invention. Abrasive articles having polymeric materials therein are also disclosed in copending U.S. Pat.
  • the components include at least about 1% by weight epoxy-functional material, more preferably at least about 30% by weight epoxy-functional material, and most preferably at least about 40% by weight epoxy-functional material, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the components include ! at most about 90% by weight epoxy-functional material and more preferably at most about 85% by weight epoxy-functional material, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the components include at least about 0.1 mole of cyclic anhydride and or diacid derived therefrom, more preferably at least about 0.2 mole cyclic anhydride and/or diacid derived therefrom, and most preferably at least about 0.3 mole cyclic anhydride and/or diacid derived therefrom, per equivalent of epoxy functionality in the epoxy-functional material.
  • the components include at mo ⁇ ft about 1.3 moles of cyclic anhydride and/or diacid derived therefrom, more preferably at most about 1.0 mole cyclic anhydride and/or diacid derived therefrom, and most preferably at most about 0.8 mole cyclic anhydride and/or diacid derived therefrom, per equivalent of epoxy functionality in the epoxy-functional material.
  • the components include at least about 0.1% by weight polyfunctional (meth)acrylate, more preferably at least about 1% by weight polyfunctional
  • the components include at most about 40% by weight polyfunctional (meth)acrylate, more preferably at most about 15% by weight polyfunctional
  • polyfunctional (meth)acrylate and most preferably at most about 10% by weight polyfunctional (meth)acrylate, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • epoxy-functional materials useful for making polymeric materials useful for making abrasive articles according to the present invention include octadecylene oxide, epichlorohydrin, styrene oxide, vinylcyclohexene dioxide (for example, having the trade designation "ERL-4206" from Union Carbide Corp., Danbury, CT), 3,4- epoxycyclohexyl-methyl-3,4-epoxycyclohexene carboxylate (for example, having the trade designation "ERL-4221” from Union Carbide Corp., Danbury, CT), 2-(3,4- epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-metadioxane (for example, having the trade designation "ERL-4234" from Union Carbide Corp., Danbury, CT), bis(3,4-epoxy- cyclohexyl) adipate (for example, having the trade designation "ERL-4299" from Union Carbide
  • 1,4-butanediol diglycidyl ether for example, having the trade designation "ARALDITE RD-2” from Vanitico, Inc., Brewster, NY
  • hydrogenated bisphenol A-epichlorohydrin based epoxy-functional materials for example, having the trade designation "EPONEX 1510” from Resolution Performance Products, Houston, TX
  • polyglycidyl ether of phenol-formaldehyde novolak for example, having the trade designation "DEN-431” and “DEN-438” from Dow Chemical Co., Midland, MI
  • triphenolmethane-epichlorohydrin based epoxy-functional material for example, having the trade designation "TACTTX 742" from Vanitico, Inc., Brewster, NY.
  • cyclic anhydrides useful for making polymeric materials useful for making abrasive articles according to the present invention include maleic anhydride, succinic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, dodecylsuccinic anhydride, phthalic anhydride, nadic anhydride, pyromellitic anhydride, and mixtures thereof.
  • a cyclic anhydride, which is particularly useful in certain embodiments of the invention, is hexahydrophthalic anhydride, which is available, for example, from Buffalo Chemical Color Corporation, Buffalo, NY.
  • Cyclic anhydrides may also be hydrolyzed to yield diacids derived therefrom.
  • the diacids although not preferred, are also useful for making polymeric materials useful for making abrasive articles according to the present invention.
  • (meth)acrylate encompasses acrylates and methacrylates.
  • Polyfunctional (meth)acrylate means that, on average, the (meth)acrylate moiety has greater than about 1.0 equivalent of (meth)acrylate functionality per molecule.
  • Examples of polyfunctional (meth)acrylates useful for making polymeric materials useful for making abrasive articles according to the present invention include ester compounds that are reaction products of aliphatic or aromatic polyhydroxy compounds and (meth)acrylic acids.
  • Polyfunctional (meth)acrylates can be monomers, oligomers, or polymers.
  • the term "monomer” means a molecule having a molecular weight less than about 400 Daltons and an inherent capability of forming chemical bonds with the same or other monomers in such manner that long chains (polymeric chains or macromolecules) are formed.
  • the term “oligomer” means a molecule having 2 to 20 repeating units (for example, dimer, trimer, tetramer, and so forth) having an inherent capability of forming chemical bonds with the same or other oligomers in such manner that longer polymeric chains can be formed therefrom.
  • polymer means a molecule having greater than 20 repeating units having an inherent capability of forming chemical bonds with the same or other polymers in such I manner that longer polymeric chains can be formed therefrom.
  • the polyfunctional (meth)acrylate utilized according to the present invention may include, for example, polyfunctional (meth)acrylate monomers, polyfunctional (meth)acrylate oligomers, and polyfunctional (meth)acrylate polymers.
  • Useful polyfunctional (meth)acrylate monomers include, for example, ethylene glycol diacrylate, ethylene glycol dimethacrylate, hexanediol diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, glycerol triacrylate, pentaerthyitol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, and neopentylglycol diacrylate.
  • the polyfunctional (meth)acrylate monomer trimethylolpropane triacrylate can be particularly useful.
  • Useful polyfunctional (meth)acrylate monomers include, for example, trimethylolpropane triacrylate available, for example, under the trade designation "SR351”; ethoxylated trimethylolpropane triacrylate available, for example, under the trade designation "SR454"; pentaerythritol tetraacrylate available, for example, under the trade designation "SR295"; and neopentylglycol diacrylate available, for example, under the trade designation "SR247”; all available from Sartomer Co., Exton, PA.
  • Useful polyfunctional (meth)acrylate oligomers include (meth)acrylated polyether and polyester oligomers.
  • useful (meth)acrylated polyether oligomers include polyethylene glycol diacrylates available, for example, under the trade designations "SR259” and “SR 344" from Sartomer Co., Exton, PA.
  • (meth)acrylated polyester oligomers are available, for example, under the trade designations "EBECRYL 657” and “EBECRYL 830" from UCB Specialty Chemicals, Smyrna, GA.
  • polyfunctional (meth)acrylate oligomers include (meth)acrylated epoxies, such as diacrylated esters of epoxy-functional materials (for example, diacrylated esters of bisphenol A epoxy-functional material) and (meth)acrylated urethanes.
  • Useful (meth)acrylated epoxies include, for example, acrylated epoxies available under the trade designations "EBECRYL 3500", “EBECRYL 3600”, “EBECRYL 3700", and “EBECRYL 3720" from UCB Specialty Chemicals, Smyrna, GA.
  • Useful (meth)acrylated urethanes include, for example, acrylated urethanes available under the trade designations
  • Polyfunctional (meth)acrylate monomers, oligomers, and polymers each generally react to form a network due to multiple functionalities available on each monomer, oligomer or polymer.
  • free radical initiator refers to a material that is capable of generating a free radical species that may cause at least partial reaction of polyfunctional (meth)acrylate.
  • useful free radical initiators include free radical photoinitiators and free radical thermal initiators.
  • a free radical initiator may be included as a component to aid in reacting of the polyfunctional (meth)acrylate, although it should be understood that an electron beam source also could be used to generate free radicals.
  • a free radical initiator is preferably included when it is desired to react the polyfunctional (meth)acrylate prior to reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • Actinic radiation for example, ultraviolet light and visible light
  • Radiative thermal sources include infrared and microwave sources.
  • Non-radiative thermal sources include air impingement ovens.
  • the temperature at which both reacting of the polyfunctional (meth)acrylate and reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom occurs can vary but for some embodiments they both may occur, for example, at a temperature greater than about 50°C, or greater than about 60°C.
  • Increasing amounts of the free radical initiator generally results in an accelerated reaction rate of the polyfunctional (meth)acrylate.
  • Increased amounts of free radical initiator can also, for some embodiments, result in reduced energy exposure requirements for reaction of the polyfunctional (meth)acrylate to occur.
  • the amount of the free radical initiator is generally determined by the rate at which it is desired for the polyfunctional (meth)acrylate to react, the intensity of the energy source, and the thickness of the composition.
  • the components include at least about 0.1% by weight free radical initiator and more preferably at least about 0.4% by weight free radical initiator, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the components include at most about 5% by weight free radical initiator, more preferably at most about
  • free radical initiator 4% by weight free radical initiator, and most preferably at most about 2% by weight free radical initiator, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • Free Radical Photoinitiators examples include organic peroxides, azo compounds, quinones, benzophenones, nitroso compounds, acyl halides, hydrazones, mercapto compounds, pyrylium compounds, triacylimidazoles, acylphosphine oxides, bisimidazoles, chloroalkyltriazines, benzoin ethers, benzil ketals, thioxanthones, acetophenone derivatives, and mixtures thereof.
  • a useful free radical-generating initiator for use with ultraviolet light is 2,2-dimethoxy-2-phenylacetophenone initiator available, for example, under the trade designation "IRGACURE 651” from Ciba Specialty Chemicals, Tarrytown, NY.
  • Examples of photoinitiators that generate free radicals when exposed to visible radiation, are described in U.S. Patent No. 4,735,632 (Oxman et al.),
  • Free radical thermal initiators useful for the present invention include azo, peroxide, persulfate, and redox initiators.
  • Suitable azo initiators include 2,2'-azobis(4-methoxy-2,4-dimethylvaleronitrile) (available under the trade designation "NAZO 33"); 2,2'-azobis(2-amidinopropane) dihydrochloride (available under the trade designation "NAZO 50"); 2,2'-azobis(2,4- dimethylvaleronitrile) (available under the trade designation “NAZO 52”); 2,2'- azobis(isobutyronitrile) (available under the trade designation 'NAZO 64"); 2,2'-azobis-2- methylbutyronitrile (available under the trade designation "NAZO 67”); l,l'-azobis(l- cyclohexanecarbonitrile) (available under the trade designation 'NAZO 88"), all of which are available from ⁇ .I. Dupont de ⁇ emours and Company, Wilmington, D ⁇ , and 2,2'- azobis(methyl isobutyrate) (available under the trade
  • Suitable peroxide initiators include benzoyl peroxide, acetyl peroxide, lauroyl peroxide, decanoyl peroxide, dicetyl peroxydicarbonate, di(4-t-butylcyclohexyl) peroxydicarbonate (available under the trade designation "PERKADOX 16", from Akzo Chemicals, Inc., Chicago, IL), di(2-ethylhexyl) peroxydicarbonate, t-butylperoxypivalate (available under the trade designation "LUPERSOL 11", from Lucidol Division., Atochem North America , Buffalo, NY) t-butylperoxy-2-ethylhexanoate (available under the trade designation "TRIGONOX 21 -C50", from Akzo Chemicals, Inc., Chicago, JL), and
  • Suitable persulfate initiators include potassium persulfate, sodium persulfate, and ammonium persulfate.
  • Suitable redox (oxidation-reduction) initiators include combinations of persulfate initiators with reducing agents such as sodium metabisulfite and sodium bisulfite; systems based on organic peroxides and tertiary amines (for example, benzoyl peroxide plus dimethylaniline); and systems based on organic hydroperoxides and transition metals (for example, cumene hydroperoxide plus cobalt naphthenate).
  • the components used in the present invention may further include a curing agent that promotes reaction of the epoxy-functional material with the cyclic anhydride and or diacid derived therefrom.
  • a curing agent that promotes reaction of the epoxy-functional material with the cyclic anhydride and or diacid derived therefrom.
  • the term "curing agent” as used herein refers to a material that increases the rate of reaction of the cyclic anhydride and/or diacid derived therefrom with the epoxy-functional material.
  • the cyclic anhydride and/or diacid derived therefrom are excluded from the definition of "curing agent.”
  • suitable curing agents include, for example, catalysts and curatives.
  • a "catalyst” is a curing agent that increases the rate of such a reaction but is not incorporated into the reaction product of the epoxy-functional material and cyclic anhydride and/or diacid derived therefrom.
  • a “curative” is a curing agent that increases the rate of such a reaction and is incorporated into the reaction product of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • the reaction of the cyclic anhydride and/or diacid derived therefrom with epoxy- functional material generally results in ester linkages.
  • the curing agent may be activated, for example, by exposure to ultraviolet or visible light radiation, by accelerated particles (for example, electron beam radiation), or thermally (for example, radiative and non- radiative sources).
  • the polyfunctional (meth)acrylate may be reacted prior to reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • a type I of energy source and curing agent is preferably selected that would not cause the epoxy- functional material to react with cyclic anhydride and/or diacid derived therefrom simultaneously with the reaction of the polyfunctional (meth)acrylate. It is advantageous for certain embodiments to react the polyfunctional (meth)acrylate using ultraviolet or visible light radiation and a free radical photoinitiator followed by reaction of the epoxy- functional material with cyclic anhydride and or diacid derived therefrom via a thermal energy source using a thermal curing agent.
  • Epoxy-functional materials and cyclic anhydrides and/or diacids derived therefrom are not free radically curable and thus would not generally be affected by the reaction of the polyfunctional (meth)a'crylate via ultraviolet light radiation unless the light generates a significant amount of heat.
  • the components include at least about 0.1% by weight curing agent and more preferably at least about 0.4% by weight curing agent, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the components include at most about 20% by weight curing agent, more preferably at most about 4% by weight curing agent, and most preferably at most about 3% by weight curing agent, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • thermo curing agent a thermal free radical initiator, and a thermal energy source may be used, for example, in such an embodiment.
  • Increasing amounts of the curing agent generally results in an accelerated reaction rate of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom. Increased amounts of curing agent generally also result in reduced energy exposure requirements for reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom to occur and a shortened pot life at application temperatures.
  • the amount of the curing agent is generally determined by the rate at which it is desired for the composition to cure, the intensity of the energy source, and the thickness of the composition.
  • Examples of useful curing agent catalysts include thermal catalysts and photocatalysts. !
  • Thermal Catalyst Curing Agents include those selected from the group consisting of Lewis acids and Lewis acid complexes inluding aluminum trichloride; aluminum tribromide; boron trifluoride; boron trichloride; antimony pentafluoride; titanium tetrafluoride; and boron trifluoride and boron trichloride complexes including, for example, BF 3 -diethylamine and a BCl 3 -amine complex available under the trade designation "OMICURE BC-120" from CVC Specialty Chemicals, Inc., Maple Shade, NJ.
  • Lewis acids and Lewis acid complexes inluding aluminum trichloride; aluminum tribromide; boron trifluoride; boron trichloride; antimony pentafluoride; titanium tetrafluoride; and boron trifluoride and boron trichloride complexes including, for example, BF 3 -diethylamine and
  • Additional useful thermal catalyst curing agents include aliphatic and aromatic tertiary amines including, for example, dimethylpropylamine, pyridin*, dimethylaminopyridine, and dimethylbenzylamine; imidazoles including, for example, 2- ethylimidazole, and 2-ethyl-4-methylimidazole (available under the trade designation "JJV1ICURE EMI-2,4" from Air Products, Allentown, PA), hydrazides including, for example, aminodihydrazide; guanidines including, for example, tetramethyl guanidine; and dicyandiamide.
  • Photocatalyst Curing Agents can, for example, be a cationic photocatalyst activated by actinic radiation (for example, ultraviolet light and visible light).
  • Useful cationic photocatalysts are generally either protic or Lewis acids.
  • Useful cationic photocatalysts include salts having onium cations and halogen-containing complex anions of a metal or metalloid (for example, aryl sulfonium salts available under the trade designations "CYRACURE UVI-6974" and "CYRACURE UNI-6976” from Union Carbide Corporation, Danbury, CT).
  • Other useful cationic photocatalysts include metallocene salts having organometallic complex cations and halogen-containing complex anions of a metal or metalloid which are further described in U.S. Pat. No. 4,751,138 (Tumey et al.).
  • Another useful cationic catalyst is the combination of an organometallic salt and an onium salt described in U.S. Pat. No. 4,985,340 (Palazotto et al.), and European Pat. Publ. Nos. 306,161 (Palazotto et al.), published March 8, 1989; and 306,162 (Palazotto et al.); published March 8, 1989.
  • Still other useful cationic photocatalysts include ionic salts of organometallic complexes in which the metals are selected from the elements of Periodic Groups, IVB, VB, NIB, NILB, and VIII which are described in
  • aliphatic and aromatic amine curatives include ethanolamine; l,2-diamino-2-methyl-propane; 2,3-diamino-2-methyl-butane; 2,3-diamino- 2-methyl-pentane; 2,4-diamino-2,6-dimethyloctane; and dibutylamine dioctylamine.
  • aromatic amine curatives include o-phenylene diamine; 4,4-diaminodiphenyl sulfone; 3,3 -diaminodiphenyl sulfone; 4,4-diaminodiphenylsulfide; 4,4 -diaminodiphenyl ketone; 4,4 -diaminodiphenyl ether; 4,4-diaminodiphenyl methane; and 1,3-propanediol- bis(4-aminobenzoate).
  • Aromatic amine curatives are advantageous in certain embodiments as they generally provide improved properties for the resulting polymeric material.
  • Increasing amounts of curing agent generally results in an accelerated reaction rate of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom. Increased amounts of curing agent generally also result in reduced energy exposure requirements for reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom to occur and a shortened pot life at application temperatures.
  • the amount of the curing agent is generally determined by the rate at which it is desired for the composition to cure, the intensity of the energy source, and the thickness of the composition.
  • a curing agent is an optional component.
  • the components include at least about 0.1% by weight curing agent and more preferably at least about 0.4% by weight curing agent, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the components include at most about 20% by weight curing agent and more preferably at most about 10% by weight curing agent, based on the total weight of the combination of epoxy-functional material, cyclic anhydride and/or diacid derived therefrom, and polyfunctional (meth)acrylate.
  • the polymeric material according to the present invention may optionally include one or more additives in addition to the (1) reaction product of components that include (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate; and/or (2) polymeric material preparable by combining at least (a) an epoxy-functional • material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a I polyfunctional (meth)acrylate.
  • additives in addition to the (1) reaction product of components that include (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • Useful additives include fillers (including grinding aids, for example), fibers, lubricants, wetting agents, surfactants, pigments, dyes, coupling agents, plasticizers, antistatic agents, and suspending agents.
  • fillers including grinding aids, for example
  • fibers including fibers, lubricants, wetting agents, surfactants, pigments, dyes, coupling agents, plasticizers, antistatic agents, and suspending agents.
  • additives in backing treatment make coat, size coat, and supersize coat compositions is described in U.S. Pat. No. 5,580,647 (Larson et al.).
  • Compositions according to the present invention may also optionally include water or an organic solvent.
  • a filler if included, preferably should not adversely affect the bonding characteristics of the polymeric material.
  • fillers suitable for this invention include metal carbonates, such as calcium carbonate (for example, chalk, calcite, marl, travertine, marble, and limestone), calcium magnesium carbonate, sodium carbonate, and magnesium carbonate; silica, such as amorphous silica, quartz, glass beads, glass bubbles, and glass fibers; silicates, such as talc, clays (for example, montmorillonite), feldspar, mica, calcium silicate, calcium metasilicate, sodium aluminosilicate, and sodium silicate; metal sulfates, such as calcium sulfate, barium sulfate, sodium sulfate, aluminum sodium sulfate, aluminum sulfate; gypsum; vermiculite; wood pulp; aluminum trihydrate; metal oxides, such as calcium oxide (lime), aluminum oxide, titanium dioxide; and metal sulfites (for example, calcium
  • the polymeric material preferably includes at least about 20% by weight filler based on the total weight of the polymeric material. If filler is present, the polymeric material preferably includes at most about 80% by weight filler based on the total weight of the polymeric material. For some embodiments at these filler loadings, the presize, saturant, backsize or subsize will exhibit good flexibility and/or toughness. Adequate flexibility is related to the stiffness of the total backing construction, and is dependent on the end use.
  • a grinding aid is generally a particulate material that has a significant effect on the chemical and physical processes of abrading, thereby resulting in improved performance.
  • the grinding aid may (1) decrease the friction between the abrasive grits and the workpiece being abraded, (2) prevent the abrasive grits from "capping," that is, prevent metal particles from becoming welded to the tops of the abrasive grits when the abrasive article is used on a metal workpiece, (3) decrease the interface temperature between the abrasive grits and the workpiece, or (4) decrease the grinding forces.
  • the addition of a grinding aid generally increases the useful life of the coated abrasive article. Grinding aids encompass i a wide variety of different materials and can be inorganic or organic.
  • Examples of useful grinding aids include waxes, organic halide compounds, halide salts, and metals and their alloys.
  • the organic halide compounds will generally break down during abrading and release a halogen acid or a gaseous halide compound.
  • Examples of such materials include chlorinated waxes, such as tetrachloronaphthalene, pentachloronaphthalene, and polyvinyl chloride.
  • Examples of halide salts include sodium chloride, potassium cryolite, sodium cryolite, ammonium cryolite, potassium tetrafluoroborate, sodium tetrafluoroborate, silicon fluorides, potassium chloride, and magnesium chloride.
  • Examples of metals include tin, lead, bismuth, cobalt, antimony, cadmium, iron, and titanitim.
  • Other grinding aids ' include sulfur, organic sulfur compounds, graphite, and metallic sulfides. It is also within the scope of this invention to use a combination of different grinding aids and, in some instances, this may produce a synergistic effect.
  • the above-mentioned examples of grinding aids is meant to be a representative showing of grinding aids, and it is not meant to encompass all grinding aids.
  • Examples of useful antistatic agents include graphite, carbon black, vanadium oxide, humectants, conductive polymers, and the like. These antistatic agents are disclosed in U.S. Pat. Nos. 5,061,294 (Harmer et al.); 5,137,542 (Buchanan et al.); and 5,203,884 (Buchanan et al.).
  • useful coupling agents include silanes, titanates, and-zircoaluminates.
  • a useful silane coupling agent is 3-methacryloxypropyltrimethoxysilane, available, for example, under the trade designation "A-174" from OSI Specialties, Inc. (Friendly, WN).
  • U.S. Pat. No. 4,871,376 (DeWald) describes reducing viscosity of resin/filler dispersions by utilizing a silane coupling agent.
  • compositions useful for making polymeric materials useful for making abrasive articles according to the present invention may be prepared by combining at least (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom, and (c) a polyfunctional (meth)acrylate.
  • the viscosity of the composition can vary. For example, if a backing has a tight weave and the composition is to be used as a saturant coat, a lower viscosity may be desirable. Conversely, if a backing has a more i open weave and the composition is to be used as a saturant coat, a higher viscosity may be desirable.
  • the polyfunctional (meth)acrylate serves as a viscosity modifier to the composition after the polyfunctional (meth)acrylate has been at least partially reacted, which allows, for example, better control of the penetration of the composition into the backing when the composition is used as a saturant coat.
  • an extremely porous backing for example, subcount woven cloth
  • This at least partial reacting generally causes a large increase in viscosity of the composition. This generally limits the movement of the composition prior to at least partial reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom. For certain embodiments, this is accomplished by subjecting the composition, after applying to a backing, to an energy source that causes the polyfunctional (meth)acrylate to at least partially react, prior to at least partially reacting the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • Various energy sources and initiator combinations can be selected to provide for , certain embodiments at least partial reaction of the polyfunctional (meth)acrylate of the backing treatment composition prior to at least partial reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • the method according to the present invention in certain embodiments allows for fewer composition applications, less energy for curing and lower raw material costs than conventional methods.
  • the polyfunctional (meth)acrylate may serve as a viscosity modifier to the composition after the polyfunctional (meth)acrylate has been at least partially reacted, allowing, for example, for increased make coat viscosity prior to at least partially curing the epoxy-functional material and cyclic anhydride and/or diacid derived therefrom when the composition is used as a make coat.
  • the increased viscosity may result in improved retention of orientation of abrasive grits as originally applied to the make coat.
  • the method according to the present invention in certain embodiments allows I for fewer composition applications, less energy for curing and lower raw material costs than conventional methods.
  • the polyfunctional (meth)acrylate may serve as a viscosity modifier to the composition after the polyfunctional (meth)acrylate has been at least partially reacted, allowing, for example, for a handleable resin coating prior to at least partially curing the epoxy-functional material and cyclic anhydride and/or diacid derived therefrom when the composition is used as a size coat.
  • the increased viscosity may result in improved processing flexibility.
  • the method according to the present invention in certain embodiments allows for fewer composition applications, less energy for curing and lower raw material costs than conventional methods.
  • the percent solids of the composition utilized according to the present invention can vary.
  • the percent solids of the composition is preferably at least about 50%, more preferably at least about 60%, even more preferably at least about 70%, even more preferably at least about 80%, even more preferably at least about 90%, and even more preferably at least about 95%.
  • the percent solids of the composition is most preferably about 100%. A higher percent solids generally results in a faster curing composition.
  • the term "percent solids" is readily understood and is capable of being determined by one skilled in the art.
  • suitable backings include polymeric film, vulcanize fibre, woven cloth, nonwoven material (for example, nonwoven cloth), stitch bonded cloth, felt, paper, and treated versions thereof.
  • the backing includes yarns including natural fibers and/or synthetic fibers.
  • the backing may, for example, include cotton, polyester, rayon, silk, nylon, or blends thereof.
  • the backing may, for example, have different yarns in the warp and fill directions.
  • useful backing materials include woven polyester with either spun yarns or continuous filament yarns, available, for example, from Milliken & Company, Spartansburg, SC, under the trade designation "POWERSTRAIT".
  • abrasive grits as used herein includes, for example, individual abrasive grits as well as multiple individual abrasive grits bonded together to form an abrasive I agglomerate.
  • Abrasive agglomerates are described, for example, in U.S. Pat. Nos. 4,311 ,489 (Kressner); 4,652,275 (Bloecher et al.); and 4,799,939 (Bloecher et al.).
  • compositions useful for making polymeric materials for making binders for making abrasive articles may contain abrasive grits.
  • the abrasive grits preferably have an average particle size of at least about 0.1 micrometer and more preferably at least about 1 micrometer.
  • the abrasive grits preferably have an average particle size of at most about 5000 micrometers, more preferably at most about 1500 micrometers, and most preferably at most about 1200 micrometers.
  • the Moh's hardness of the abrasive grits can vary.
  • the Moh's hardness of the alfrasive grits is preferably at least about 5, more preferably at least about 6, even more preferably at least about 7, even more preferably at least about 8, and most preferably at least about 9.
  • materials of such abrasive grits include aluminum oxide (for example, fused aluminum oxide, ceramic aluminum oxide, white fused aluminum oxide, and heat treated aluminum oxide), silica, silicon carbide (for example, green silicon carbide), alumina zirconia, zirconium oxide, diamond, ceria, cubic boron nitride, garnet, and tripoli.
  • the ceramic aluminum oxide can be made, for example, according to a sol gel process, such as described in U.S. Pat. Nos.
  • Ceramic aluminum oxides include,-for example, alpha alumina and, optionally, a metal oxide modifier, including, for example, magnesia, zirconia, zinc oxide, nickel oxide, hafnia, yttria, silica, iron oxide, titania, lanthanum oxide, ceria, and neodynium oxide.
  • the ceramic aluminum oxide may also optionally include a nucleating agent, including, for example, alpha alumina, iron oxide, iron oxide precursor, titania, and chromia.
  • the ceramic aluminum oxide may also have a shape, such as that described in U.S. Pat. Nos. 5,201,916 (Berg et al.) and 5,090,968 (Pellow).
  • the abrasive grit may also have a surface coating.
  • a surface coating can improve the adhesion between the abrasive grit and the polymeric material and/or can alter the abrading characteristics of the abrasive grit.
  • Such surface coatings are described in U.S. Pat. Nos. 5,011,508 (Wald et al.); 1,910,444 (Nicholson); 3,041,156 (Rowse et al.); 5,009,675 (Kunz et al.); 4,997,461 (Markhoff-Matheny et al.); 5,213,591 (Celikkaya et al.); and 5,042,991 (Kunz et al.).
  • An abrasive grit may also contain a coupling agent on its surface, such as a silane coupling agent.
  • Compositions useful for making polymeric materials for making binders for making abrasive articles according to the present invention may, for example, contain a single type of abrasive grit, two or more types of different abrasive grits, or at least one type of abrasive grit with at least one type of diluent material.
  • materials for diluents include calcium carbonate, glass bubbles, glass beads, greystone, marble, gypsum, clay, SiO 2 , KBF 4 , Na 2 SiF 6 , cryolite, organic bubbles, organic beads, and the like.
  • the weight percentages of the abrasive grits and the polymeric material according to the present invention will depend on several factors, such as the intended use of the abrasive article and the particle size and distribution of the abrasive grit.
  • the abrasive grits, if included, will be at least about 5% by weight and more preferably at least about 20% by weight, based on the total weight of the abrasive layer.
  • the abrasive grits, if included will be at most about 95% by weight and more preferably at most about 75% by weight, based on the total weight of the abrasive layer.
  • the polymeric material will be at least about 5% by weight, based on the total weight of the abrasive layer.
  • the polymeric material will be at most about 95% by weight and more preferably at most about 80% by weight, based on the total weight of the abrasive layer.
  • compositions useful for making polymeric materials for making binders for making abrasive articles according to the present invention may be used to provide one or more of a make coat, a size coat, a slurry coat, a presize coat, a saturant coat, a backsize coat, a subsize coat, and a supersize coat.
  • compositions suitable for making abrasive products include thermosetting or thermoplastic polymeric materials in one or more of a make coat, a size coat, a slurry coat, a presize coat, a saturant coat, a backsize coat, a subsize coat, or a supersize coat.
  • the components utilized according to the present invention can optionally be blended with conventional resins.
  • thermosetting polymeric materials examples include phenolic resins, urea- I formaldehyde resins, melamine-formaldehyde resins, urethane resins, (meth)acrylate resins, polyester resins, aminoplast resins having pendant ⁇ , ⁇ -unsaturated carbonyl groups, epoxy-functional materials, (meth)acrylated urethane, and (meth)acrylated epoxies.
  • the binder and/or abrasive product may also include additives such as fibers, lubricants, wetting agents, thixotropic materials, surfactants, pigments, dyes, antistatic agents (for example, carbon black, vanadium oxide, graphite, etc.), coupling agents (for example, silanes, titanates, zircoaluminates, etc.), plasticizers, suspending agents, and the like.
  • additives such as fibers, lubricants, wetting agents, thixotropic materials, surfactants, pigments, dyes, antistatic agents (for example, carbon black, vanadium oxide, graphite, etc.), coupling agents (for example, silanes, titanates, zircoaluminates, etc.), plasticizers, suspending agents, and the like.
  • the amounts of these optional additives are selected to provide the desired properties.
  • the coupling agents can improve adhesion to the abrasive particles and/orfiller.
  • the binder chemistry may be thermally cured
  • the coated abrasive article may include a backing having thereon a coat including, for example, a presize coat, a saturant coat, a backsize coat, a subsize coat.
  • a coating provided by compositions according to the present invention can serve multiple functions. For example, a single coating can serve as both a presize coating and a saturant coating.
  • the backing may be porous or nonporous.
  • the backing treatment composition may be applied to the backing by a variety of techniques such as, for example, roll coating, spray coating, gravure coating, die coating, knife coating, or curtain coating.
  • the backing having the composition thereon in a form including, for example, a backsize coat, a saturant coat, a presize coat, and a subsize coat is generally exposed to at least one energy source to initiate reaction of the polyfunctional (meth)acrylate and/or reaction of the epoxy- functional material with cyclic anhydride and/or diacid derived therefrom.
  • energy sources include actinic radiation (for example, ultraviolet light and visible light), accelerated particles (for example, electron beam radiation), and thermal sources (for example, radiative and non-radiative sources).
  • the energy source is advantageous in some embodiments for the energy source to be ultraviolet light, visible light or accelerated particles when one desires to facilitate reaction of the polyfunctional (meth)acrylate I component, prior to reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • the energy source is generally selected to be thermal when one desires to facilitate reaction of the epoxy-functional material with the cyclic anhydride and/or diacid derived therefrom subsequent to the polyfunctional (meth)acrylate reaction.
  • the curing temperature is generally limited to the temperature that the backing can withstand without being damaged. For example, if the backing includes polyester fibers, the temperature the backing is subjected to is preferably less than about 200°C. If the backing includes aramid fibers the temperature the backing is subjected to is preferably less than about 300°C.
  • the rate of curing with any energy source generally varies with the nature of backing treatment composition.
  • the dry weight of each presize coat, saturant coat, backsize coat, or subsize coat according to the present invention is preferably at least about 1 gram per square meter (g/m 2 ) and preferably at least about 25 g/m 2 .
  • the dry weight of each presize coat, saturant coat, backsize coat, or subsize coat according to the present invention is preferably at most about 600 g/m 2 and preferably at most about 400 g/m 2 .
  • Coated abrasive articles according to the present invention may include at least a make coat, a size coat, and/or a supersize coat on a porous on non-porous- backing. These coating may be applied by a variety of techniques such as, for example, roll coating, spray coating, gravure coating, die coating, knife coating, curtain coating, and powder coating.
  • compositions according to the present invention to provide, for example, make coatings, size coatings, and supersize coatings, are generally exposed to at least one energy source to initiate reaction of the polyfunctional (meth)acrylate.
  • energy sources include actinic radiation (for example, ultraviolet light and visible light), accelerated particles (for example, electron beam radiation), and thermal sources (for example, radiative and non- radiative sources).
  • the energy source is advantageous in some embodiments, for example the make coat, for the energy source to be ultraviolet light, visible light or accelerated particles which facilitate reaction of the polyfunctional (meth)acrylate component, prior to reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom.
  • Abrasive grits may be included in the make coat using conventional methods including drop coating and electrostatic coating.
  • the energy source is generally selected to be thermal when one desires to facilitate reaction of the epoxy-functional material with cyclic anhydride and/or diacid derived therefrom subsequent to the polyfunctional (meth)acrylate reaction.
  • the curing temperature is generally limited to the temperature that the backing can withstand without being damaged. For example, if the backing includes polyester fibers, the temperature the backing is subjected to is preferably less than about 200°C. If the backing includes aramid fibers the temperature the backing is subjected to is preferably less than about 300°C.
  • the rate of curing with any energy source generally varies with the nature of backing treatment composition.
  • the dry weight of each make coat, size coat, or supersize coat preferably is about 1 to about 1500 grams per square meter, more preferably about 25 to about 700 grams per square meter.
  • the slurry coat is an abrasive coating that includes a plurality of abrasive grits and (1) a reaction product of components that include (a) an epoxy- functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom; and/or (2) a polymeric material preparable by combining at least (a) an epoxy-functional material, and (b) at least one of a cyclic anhydride or a diacid derived therefrom.
  • Another aspect of the invention is a nonwoven article of the type in which a polymeric material is applied to a lofty, open, fibrous mat of fibers, at least some of which are bonded together at points at which they contact.
  • An open mat means that the mat is sufficiently open for at least a portion of the grit to penetrate to the interior of the mat.
  • the polymeric material may be (1) a reaction product of components that include (a) an epoxy-functional material, (b) at least one of a cyclic anhydride or a diacid derived therefrom; and/or (2) a polymeric material preparable by combining at least (a) an epoxy- functional material, and (b) at least one of a cyclic anhydride or a diacid derived therefrom.
  • Nonwoven articles within the invention optionally have a plurality of abrasive grits adhered to the fibers by the polymeric material.
  • Nonwoven webs including open, lofty, three dimensional structures of fibers bonded to one another at their mutual contact points are used extensively in the manufacture of abrasive articles for cleaning, abrading, finishing and polishing applications on any of a variety of surfaces.
  • Exemplary of such nonwoven articles are those described in U.S. Pat. No. 2,958,593 (Hoover et al.).
  • Such nonwoven webs include a suitable fiber such as nylon, polyester, blends thereof, and the like, and are capable of withstanding temperatures at which impregnating resins and adhesive binders are generally cured.
  • the fibers of the web are often tensilized and crimped but may also be continuous filaments formed by an extrusion process such as that described in U.S. Pat. No. 4,227,350 (Fitzer), for example.
  • Nonwoven webs are readily formed on conventional equipment such as a Rando Webber machine.
  • Fine abrasive particles (defined herein as particles having a distribution of sizes wherein the median particle diameter in the distribution is about 60 micrometers or less) may be bonded to the fibers of a nonwoven web to provide abrasive articles suitable for use in any of a variety of abrasive applications, and such articles may be provided in the form of endless belts, discs, hand pads, densified or compressed wheels, floor polishing pads, and the like.
  • a particularly appropriate use for articles including the aforementioned fine particles is in the automotive aftermarket industry, where the abrasive particles are employed to "scuff" or lightly abrade automobile body panels in preparation for painting. In these applications, the abrasive article is applied to a previously painted surface.
  • the web is reinforced, for example, by the application of a prebond resin to bond the fibers at their mutual contact points. Additional resin layers may subsequently be applied to the prebonded web.
  • a make coat precursor is applied over the fibers of the prebonded web and the make coat precursor is at least partially cured.
  • a size coat precursor may be applied over the make coat precursor and both the make coat precursor and the size coat
  • precursors are sufficiently hardened in a known manner (for example, by heat curing). Fine abrasive particles, when included in the construction of the article, are conventionally applied to the fibers in a slurry with the make coat precursor.
  • the abrasive articles according to the present invention can take the form, for example, of belts, rolls, cones, and discs.
  • the abrasive articles according to the present invention are useful, for example, for wet grinding, dry grinding, and/or sanding applications.
  • Methods for abrading with abrasive articles according to the present invention range from snagging (that is, high pressure high stock removal) to polishing (for example, polishing medical implants with coated abrasive belts), wherein the latter is generally done articles having finer grades (for example, less ANSI 220 and finer) of abrasive particles.
  • the abrasive articles may also be used in precision abrading applications, such as grinding camshafts with vitrified bonded wheels. The size of the abrasive particles in articles used for particular abrading applications will be apparent to those skilled in the art.
  • Abrading with abrasive articles according to the present invention may be done dry or wet.
  • the liquid may be introduced supplied in the form of a light mist to complete flood.
  • Examples of commonly used liquids include water, water-soluble oil, organic lubricant, and emulsions.
  • the liquid may serve to reduce the heat associated with abrading and/or act as a lubricant.
  • the liquid may contain minor amounts of additives such as bactericide, antifoaming agents, and the like.
  • Abrasive articles according to the present invention may be used to abrade workpieces such as aluminum metal, carbon steels, mild steels, tool steels, stainless steel, hardened steel, titanium, glass, ceramics, wood, wood-like materials, paint, painted surfaces, organic coated surfaces, and the like.
  • the applied force during abrading generally ranges from about 1 to about 100 kilograms.
  • TMPTA trimethylol propane triacrylate
  • Epoxy-functional material/ Anhydride/Polyfunctional (meth)acrylate Presize (EAAP-2).
  • EAAP-2 Epoxy-functional material/ Anhydride/Polyfunctional (meth)acrylate Presize
  • a 237 ml jar was charged with 70 grams of Bisphenol A epoxy-functional material (EPON 828), 30 grams of melted HHPA and 1 gram of 2,2-dimethoxy-2- phenylacetophenone initiator (IRGACURE 651).
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes, removed from the oven and 5.4 g of
  • TMPTA (SR351) was mixed into the composition with a wooden rod.
  • the jar containing the composition was returned to the oven heated to 50°C for 15 minutes.
  • the jar containing the composition was removed from the oven and 3 grams of aryl sulfonium S 6 F 6 salt photocatalyst obtained under the trade designation "CYRACURE UVI 6974" from Union Carbide Corporation, Danbury, CT was added thereto and mixed with a wooden rod, immediately after which the composition was coated as described later herein.
  • Epoxy-functional material/ Anhydride/Polyfunctional (meth)acrylate Presize (EAAP-3).
  • a 237 ml jar was charged with 70 grams of Bisphenol A epoxy-functional material EPON 828, 30 grams of melted HHPA and 1 gram of 2,2-dimethoxy-2- phenylacetophenone initiator obtained under the trade designation "IRGACURE 651” from Ciba Specialty Chemicals, Hawthorne, NY.
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes, removed from the oven and 5 grams of trimethylol propane triacrylate (TMPTA) obtained under the trade designation "SR351" from Sartomer Co., Exton, PA and 5 grams.
  • TMPTA trimethylol propane triacrylate
  • acrylated polyester oligomer (Ebecryl 657) obtained under the trade designation "EBECRYL 657" from UCB UCB Chemicals Corp., Smyrna, GA, was mixed into the composition with a wooden rod.
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes.
  • the jar containing the composition was removed from the oven and 1 gram of 2-ethyl-4-methylimidazole (EVIICURE EMI-2,4) was added thereto and mixed with a wooden rod, immediately after which the composition was coated as described later herein.
  • Epoxy-functional material/Cyclic Anhydride Backsize (EAB).
  • EAB Epoxy-functional material/Cyclic Anhydride Backsize
  • a 237 ml jar was charged with 70 grams of Bisphenol A epoxy-functional material (EPON 828), 30 grams of melted HHPA.
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes, removed from the oven, following which 67 grams of feldspar obtained under the trade designation "MINSPAR 3" from K-T Feldspar Corporation, Spruce Pine, NC, was mixed into the composition with a wooden rod.
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes.
  • the jar containing the composition was removed from the oven and 1 gram of 2-ethyl-4- methylimidazole (IMICURE EMI-2,4) was added thereto and mixed with a wooden rod, immediately after which the composition was coated as described later herein.
  • IMICURE EMI-2,4 2-ethyl-4- methylimidazole
  • make coat compositions were used in abrasive articles, the preparation of which is described later herein.
  • Epoxy-functional material/Anhydride/Polyfunctional (meth)acrylate (EAAM).
  • EAAM Epoxy-functional material/Anhydride/Polyfunctional (meth)acrylate
  • a 237 ml jar was charged with 69.5 grams of Bisphenol A epoxy-functional material (EPON 828), 24.4 grams of melted HHPA, 4.2 grams of Bisphenol A epoxy-functional material obtained under the trade designation "EBECRYL 3720" from UCB Chemicals Corp., Smyrna, GA, and 1 gram of 2,2-dimethoxy-2-phylacetophenone initiator (IRGACURE
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes and removed from the oven. Next, 108 grams of feldspar (MINSPAR 3) was mixed into the composition with a wooden rod. The jar containing the composition was returned to the oven heated to 50°C for 15 minutes. Next, the jar containing the composition was removed from the oven and 1 gram of 2-ethyl-4-methylimidazole
  • laminating Adhesive LAI A 237 ml jar was charged with 70 grams of Bisphenol A epoxy-functional material (EPON 828) and 40 grams of a polyamide amine obtained under the "VERSAMLD 125" from Henkel Adhesive Corporation, Elgin, JL, and mixed with a low shear mixer.
  • Laminating Adhesive LA2 A 237 ml jar was charged with 100 grams of Bisphenol A epoxy-functional material (EPON 828), 28 grams of a cycloaliphatic diamine obtained under the trade designation "PACM” from Air Products, Allentown, PA, and 5 grams of an aliphatic diamine obtained under the trade designation "ANCAMINE AD” from Air Products, Allentown, PA, and then mixed with a low shear mixer.
  • Bisphenol A epoxy-functional material EPON 828
  • PAM cycloaliphatic diamine obtained under the trade designation "PACM” from Air Products, Allentown, PA
  • ANCAMINE AD an aliphatic diamine obtained under the trade designation
  • CT-1 to CT-5 A 30.5 cm wide coating knife obtained from Gardco, A Paul N. Gardner Company, Inc., Pompano Beach, FL, and an about 30 x 30 x 2.5 cm machined stainless steel coating platform were heated to 66°C. The knife was set to a minimum gap of 225 micrometers to permit the 10.2 cm wide cloth backing to pass thereunder.
  • CT-1 to CT-4 were untreated polyester cloth having a weight of 300-400 grams per square meter (g/m 2 ), and CT-5 was polyester subcount XF having a weight of 150-300 g/m 2 . Both cloth backings were obtained from Milliken & Company, Spartanburg, SC.
  • the polyester cloth was placed under the coating knife, the presize composition identified in Table 1 was poured onto the polyester cloth and was coated by pulling the polyester cloth by hand under the knife to form a presize coat on the polyester cloth.
  • the presized cloth backings were irradiated with an ultraviolet (UN) Fusion System lamp (118 Watts/cm, D bulb, Gaithersburg, MD), at about 5 meters per minute (mpm) to react the polyfunctional (meth)acrylate and then thermally cured at the time and temperature specified in Table 1.
  • the presize weight (see Table 1) was determined by comparing the g/m 2 of 5.1 cm x 20.3 cm sections of the presized polyester cloth and untreated polyester cloth after curing. See Table 1 for more details.
  • Coated abrasive articles (Examples 1-7 and Comparative Example A) were prepared as follows using the treated cloth backings and make coat compositions indicated in Table 2.
  • a 30.5 cm wide coating knife and platform identical to those in the "General Description for Providing Presize Composition on Cloth Backings CT-1 to CT-5" were heated to 66°C.
  • the knife was set to a 25 micrometer gap.
  • the treated cloth was coated with make coat composition EAAM or PF2 as indicated in Table 2 using the knife and platform. The cloth was mechanically pulled under the knife to form the make coat by hand.
  • the treated cloth coated with EAAM make coat composition was irradiated to at least partially react the polyfunctional (meth)acrylate with a UN Fusion lamp at 118 Watts/cm (D-bulb) at about 5 meters per minute (mpm), followed by electrostatic coating of abrasive grit into the make coat composition.
  • Comparative Example A and Examples 1-4, 6, and 7 used a grade 50 aluminum oxide/zirconium oxide abrasive grit combination obtained under the trade designation " ⁇ ORZO ⁇ " from Norton Company, Worcester, MA, and Example 5 used a grade 60 aluminum oxide available frommaschineacher,maschineach, Austria.
  • the EAAM make coat composition was cured at 160°C for 30 minutes in an air impingement oven for Examples 1-3 and 7.
  • the EAAM coat composition was cured at 90°C for 60 minutes, at 105°C for 60 minutes, and at 160°C for 30 minutes in an air impingement oven, for Example 6.
  • the PF2 make coat composition was also electrostatically coated with the grade 50 aluminum oxide/zirconium oxide abrasive grit combination (NORZON).
  • the PF2 make coat composition was cured at 90°C for 60 minutes and at 105°C for 60 minutes in an air impingement oven for Comparative Example A and Examples 4-5.
  • Each coated abrasive article to be tested was converted into an about 8 cm wide by 25 cm long piece.
  • One-half the length of a wooden board (17.8 cm by 7.6 cm by 0.6 cm thick) was coated with laminating adhesive LAI or LA2 depending on the test to be conducted.
  • Laminating adhesive LAI was used for 25°C 90 degree peel adhesion testing and LA2 was used for 121 °C 90 degree peel adhesion testing.
  • the entire width of, but only the first 15 cm of the length of, the coated abrasive article was coated with laminating adhesive LAI or LA2 on the side bearing the abrasive particles.
  • the side of the coated abrasive article bearing the abrasive particles was attached to the side of the board containing the laminating adhesive coating in such a manner that the 10 cm of the coated abrasive article not bearing the laminating adhesive overhung from the board. Pressure was applied such that the board and the coated abrasive article were intimately bonded.
  • the board and coated abrasive article bonded with laminating adhesive LAI were cured at room temperature (that is, about 25°C) for 4 hours and at 90°C for 12 hours.
  • the board and coated abrasive article bonded with LA2 were cured at room temperature (that is, about 25°C) for 60 minutes, 120°C for 20 minutes, 130°C for 15 minutes, and 140°C for 15 minutes.
  • the coated abrasive article to be tested was cut along a straight line on both sides of the article such that the width of the coated abrasive article was reduced to 5.1 cm.
  • the resulting coated abrasive article/board composite was mounted horizontally in a fixture attached to the upper jaw of a tensile testing machine obtained under the trade designation "SINTECH 6W" from MTS
  • Useful coated abrasive articles with cloth backings generally have 90° Peel Adhesion values at 25°C of at least about 1.5 kg/cm.
  • the data in Table 2 illustrates that Examples 1-7 all have 90° Peel Adhesion values at 25°C of at least about 1.5 kg/cm.
  • the aforementioned composition was diluted to 83% solids by weight with water to provide make coat composition PF4.
  • the aforementioned composition was diluted to 75% by weight with water to provide make coat composition PF5.
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes removed from the oven, and mixed with a wooden rod. Next, 108.0 g of feldspar (MINSPAR 3) was mixed into the composition with the wooden rod. The jar containing the composition was returned to the oven heated to 50°C for 15 minutes. Next, the composition was removed from the oven and 1 g of 2-ethyl-4- methylimidazole (IMICURE EMI-2,4) was added and mixed into the composition with a wooden rod just prior to coating.
  • MIMICURE EMI-2,4 2-ethyl-4- methylimidazole
  • Epoxy-functional material/ NADIC Cyclic Anhydride /4.3 %Poly functional (meth)acrylate Make Coat Composition (EM-5).
  • a 237 ml jar was charged with 63.8 g of Bisphenol A epoxy-functional material (EPON 828), 30.0 g of methyl-5-norbornene-2,3-dicarboxylic anhydride obtained under the trade designation "NADIC” from Aldrich Chemical, Milwaukee, WI, 4.2 g of Bisphenol A epoxy acrylate (EBECRYL 3720) and 1 g 2,2-dimethoxy-2- phenylacetophenone (IRGACURE 651).
  • the jar containing the composition was placed in an oven heated to 50°C for 15 minutes, removed from the oven, and mixed with a wooden rod.
  • feldspar 108.0 g of feldspar (MINSPAR 3) was mixed into the composition with a low shear mixer.
  • the jar containing the composition was returned to the oven heated to 50°C for 15 minutes.
  • the jar containing the composition was removed from the oven and 1 g of 2-ethyI-4- methylimidazole (IMICURE EMI-2,4) was added and mixed into the composition with a wooden rod just prior to coating.
  • the jar containing the composition was removed from the oven.
  • the composition was mixed with a wooden rod following which 25 g of trimethylol propane triacrylate obtained under the trade designation "SR351" from Sartomer Co., Exton, PA and 94 g of cryolite (available under the trade designation "RTNC CRYOLITE” from TR International Trading Company Inc., Houston,
  • composition PF6 Conventional Size Coat Composition PF6.
  • a 10.2 cm wide coating knife and 15.2 cm by 20.3 cm coating platform were heated to 66°C.
  • the coating knife and platform were both prepared from machined stainless steel.
  • the coating knife was equipped with set screws to allow adjustment of the coating gap.
  • the coating knife was set to a 25-50 micrometer gap.
  • the backing material was saturated with a 90% resole phenolic/10% nitrile latex resin bringing the weight to 416 grams per square meter.
  • the backing material was subsequently backsized with a blend of 55% CaCO 3 ; 43% resole phenolic; and a small amount of Fe 2 O 3 for color, bringing the weight of the backing material to about 516 grams per square meter referred to herein as CPTL Cloth.
  • the backing material was coated with the 100% solids epoxy-functional material/cyclic anhydride/polyfunctional (meth)acrylate make coat composition
  • the make coat thickness prior to the subsequently described exposure to radiation was -50 micrometers at 100% solids.
  • the make coat was irradiated to react the polyfunctional (meth)acrylate (118 Watts/cm at about 5 mpm using a Fusion UN Systems (Gaithersburg, MD) D bulb) followed by electrostatic coating of grade
  • the coated abrasive article was converted into 2.5 cm x 104 cm strips and a polyamide attachment piece was formed on each end of a strip by placing an end of the strip into a mold and injecting polyamide hot melt adhesive obtained under the trade designation "JET MELT BRAND ADHESIVE PG3779" from 3M Industrial Specialties Division, Minnesota Mining and Manufacturing Company, St. Paul, MN with a hot melt gun.
  • Each polyamide attachment piece had a cylindrical shape with a height of 2.5 cm and diameter of 1.0 cm.
  • Example 9 The procedure of Example 9 was identical to that of Example 8 except that the make coat type was EM-4 and the make coat thickness was 50 micrometers at 100% solids.
  • Example 10 The procedure of Example 10 was identical to that of Example 8 except that the make coat type was EM-2, the make coat weight was 176 g/m 2 at 100% solids (thickness of 50 micrometers), the make coat cure conditions were 45 minutes at 90°C, 30 minutes at 100°C, and 30 minutes at 160°C, the abrasive grit coat weight was 595 g/m 2 , the size coat weight was 427 g/m 2 at 75% solids and the size coat cure conditions were 90 minutes at 90°C and 14 hours at 105°C.
  • the make coat type was EM-2
  • the make coat weight was 176 g/m 2 at 100% solids (thickness of 50 micrometers)
  • the make coat cure conditions were 45 minutes at 90°C, 30 minutes at 100°C, and 30 minutes at 160°C
  • the abrasive grit coat weight was 595 g/m 2
  • the size coat weight was 427 g/m 2 at 75% solids
  • the size coat cure conditions were
  • Example 11 The procedure of Example 11 was identical to that of Example 10 except that the make coat type was EM-3, the make coat weight was 201 g/m 2 at 100% solids (thickness of 50 micrometers), the abrasive grit coat weight was 615 g/m 2 , and the size coat weight was 436 g/m 2 at 75% solids.
  • Example 12 The procedure of Example 12 was identical to that of Example 11 except that the make coat type was EM-3, the make coat weight was 189 g/m 2 at 100% solids (thickness of 50 micrometers), the abrasive grit coat weight was 705 g/m 2 , and the size coat weight was 465 g/m 2 at 75% solids.
  • the make coat type was EM-3
  • the make coat weight was 189 g/m 2 at 100% solids (thickness of 50 micrometers)
  • the abrasive grit coat weight was 705 g/m 2
  • the size coat weight was 465 g/m 2 at 75% solids.
  • Example 13 The procedure of Example 13 was identical to that of Example 12 except that the make coat type was EM-5, the make coat weight was 201 g/m 2 at 100% solids (thickness of 50 micrometers), the abrasive grit coat weight was 628 g/m 2 , and the size coat weight was 436 g/m 2 at 75% solids
  • COMPARATIVE EXAMPLES B-D COATED ABRASIVE ARTICLES HAVING CONVENTIONAL PF4 MAKE COATS
  • a 30.5 cm wide RMO (Round Multiple Orifice) die coater was prepared from machine stainless steel by Minnesota Mining and Manufacturing Company and set up for coating.
  • the CPTL Cloth was die coated with conventional PF4 make coat composition on the side of the cloth opposite the backsize followed by electrostatic coating of grade 50 aluminum oxides/zirconium oxide abrasive grit combination (NORZON) at a weight of 612 g/m 2 into the make coat composition.
  • the PF4 make coat was cured for 90 minutes at 90°C and then 45 minutes at 100°C in an air impingement oven.
  • the make coat weight prior to curing was 255 g/m at 83% solids.
  • the abrasive grit coated make coat was spray sized with PF6 and cured 90 minutes at 90°C and 14 hours at 105°C in an air impingement oven.
  • the size coat weight prior to curing was 288 g/m 2 at 75% solids.
  • the coated abrasive article was converted into 2.5 cm x 104 cm strips and a polyamide attachment piece was formed on each end of a strip by placing the end of the strip into a mold and injecting polyamide hot melt adhesive obtained under the trade designation "JET MELT BRAND ADHESIVE PG3779" from 3M Industrial Specialties Division, Minnesota Mining and Manufacturing Company, St. Paul, MN, into the mold with a hot melt gun.
  • Each polyamide attachment piece had a cylindrical shape with height of 2.5 cm and diameter of 1.0 cm.
  • Comparative Example B except that the size coat weight was 281 g/m 2 at 75% solids.
  • Comparative Example B except that the size coat weight was 288 g/m 2 at 75% solids.
  • ULTRAMID "ULTRAMID" were coated with conventional PF5 make coat composition using a 3.8 cm wide paint brush and grade 50 aluminum oxide/zirconium oxide abrasive grit (NORZON) was drop coated into the make coat.
  • the make coat composition was cured at 90°C for 60 minutes and at 105°C for 60 minutes.
  • the discs were sized with size coat composition ES-2 or PF7 using a 3.8 cm wide paint brush and cured for a specified time and temperature. (See Table 3 for more detail).
  • the PF5 make coat and PF7 size coats were at 75% solids prior to curing and 100% solids after curing.
  • Size coat ES-2 was at 100% solids both prior to and subsequent to curing.
  • a workpiece was mounted on a reciprocating table of the grinding machine with the longer axis of the workpiece parallel to the direction of the table motion.
  • the table was traversed at a speed of 9.1 m/min in a direction parallel to the movement of the abrasive article at the grinding interface.
  • the metal wheel was moved toward the table in a down feed increment of 0.051 to 0.089 mm. as indicated in Tables 4-7. If one workpiece became worn down to a point where it was no longer in contact with the abrasive article, a new workpiece was mounted on the reciprocating table.
  • a new separate coated abrasive sample was used for both the wet grinding test and dry grinding test.
  • For the wet grinding tests 23 1/min of water was delivered to the grinding interface as a coolant.
  • For the dry grinding tests 350-500 ml/min of water as a coolant was applied to the abraded surface of the work piece as it moved away from the grinding interface.
  • a stream of compressed air was used to remove any residual water from the surface of the work piece prior to it contacting the coated abrasive.
  • the end point of the test was when the normal forces at the grinding interface reached 222.4 Newtons (N). The total amount of 1018 steel removed from the workpiece is reported in grams cut.
  • the abrasive disc to be evaluated was attached to a 20. 3 cm circular backup plate, available by ordering Part No 05114145192 from 3M Abrasive Systems Division, Minnesota Mining and Manufacturing Company, St. Paul, MN, 55144-1000 and secured to a Swing Arm tester, obtained from Reel Mfg. Inc., Centerville, MN, with a metal screw fastener.
  • a 1.897 mm thick 4130 steel (alloy steel containing by weight C 0.28-0.33%, Si 0.20 -0.35% Mn 0.40-60%, Cr 0.80-1.10%, P 0.025% maximum, Mo 0.15- 0.25%, S 0.025% maximum) cylindrical shaped work piece with a 30.5 cm diameter and 1.897 mm thickness was weighed and secured to the Swing Arm tester with a metal fastener.
  • the pressure of the steel workpiece to be exerted onto the abrasive article disc was set at 4.0 kg.
  • the abrasive disc was rotated at 350 rpm and the workpiece was placed against the disc at an angle of 16.5 degrees.
  • the endpoint of the test was 8 minutes at 350 rpm.
  • the amount of steel removed (that is, total cut) and weight loss of each abrasive disc (that is, shelling) was recorded and is reported in Table 9.
  • the epoxy-functional material/cyclic anhydride/polyfunctional (meth)acrylate size coat compositions demonstrated their utility as size coats by exhibiting shelling (that is, disc weight loss) substantially equivalent to abrasive article discs having conventional phenolic/formaldehye size coats (Comparative Examples E-F) and substantially similar total cut performance.
  • Shelling is defined as weight loss of a coated abrasive during grinding due to, for example, loss of abrasive grit, make coat, and/or size coat.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Epoxy Resins (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne des articles abrasifs ainsi que des procédés de fabrication de ceux-ci. Ces articles abrasifs contiennent un polymère qui comporte: (1) un produit de la réaction de composants comprenant (a) une matière à fonction époxy, (b) au moins un anhydride cyclique ou un dérivé diacide de celui-ci, et (c) un (méth)acrylate polyfonctionnel; et/ou (2) un polymère pouvant être préparé en associant au moins (a) une matière à fonction époxy, (b) au moins un anhydride cyclique ou un dérivé diacide de celui-ci, et enfin, (c) un (méth)acrylate polyfonctionnel.
EP01994481A 2001-03-20 2001-12-21 Articles abrasifs contenant un polymere Withdrawn EP1373355A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US812174 2001-03-20
US09/812,174 US20040029511A1 (en) 2001-03-20 2001-03-20 Abrasive articles having a polymeric material
PCT/US2001/050596 WO2002074839A2 (fr) 2001-03-20 2001-12-21 Articles abrasifs contenant un polymere

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EP1373355A2 true EP1373355A2 (fr) 2004-01-02

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US (1) US20040029511A1 (fr)
EP (1) EP1373355A2 (fr)
JP (1) JP2004526582A (fr)
AU (1) AU2002246872A1 (fr)
BR (1) BR0116932A (fr)
WO (1) WO2002074839A2 (fr)

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AU2002246872A1 (en) 2002-10-03
WO2002074839A3 (fr) 2003-03-13
US20040029511A1 (en) 2004-02-12
BR0116932A (pt) 2004-03-02
WO2002074839A2 (fr) 2002-09-26
JP2004526582A (ja) 2004-09-02

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