WO2021116882A1 - Article abrasif - Google Patents

Article abrasif Download PDF

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Publication number
WO2021116882A1
WO2021116882A1 PCT/IB2020/061600 IB2020061600W WO2021116882A1 WO 2021116882 A1 WO2021116882 A1 WO 2021116882A1 IB 2020061600 W IB2020061600 W IB 2020061600W WO 2021116882 A1 WO2021116882 A1 WO 2021116882A1
Authority
WO
WIPO (PCT)
Prior art keywords
laminate
abrasive article
backing
abrasive
substrate
Prior art date
Application number
PCT/IB2020/061600
Other languages
English (en)
Inventor
Junting LI
Jing Zhang
Liming Song
Jimmy M. Le
Stephen M. Sanocki
Yaohua GAO
Paul J. CORDES
Gregory S. MUELLER
Ernest L. Thurber
Yuyang LIU
Jaime A. Martinez
Michael J. Annen
Original Assignee
3M Innovative Properties Company
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 Company filed Critical 3M Innovative Properties Company
Priority to EP20825244.5A priority Critical patent/EP4072779A1/fr
Priority to CN202080085693.2A priority patent/CN114829069A/zh
Priority to US17/756,911 priority patent/US20230001541A1/en
Publication of WO2021116882A1 publication Critical patent/WO2021116882A1/fr

Links

Classifications

    • 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
    • B24D3/007—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 between different parts of an abrasive tool
    • 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
    • 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
    • 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
    • B24D11/02—Backings, e.g. foils, webs, mesh fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0072—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing
    • 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
    • B24D3/001—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 supporting member
    • B24D3/002—Flexible supporting members, e.g. paper, woven, plastic materials
    • B24D3/004—Flexible supporting members, e.g. paper, woven, plastic materials with special coatings

Definitions

  • the loops serve as the loop-portion of a hook-and-loop attachment system for attachment to a tool.
  • Net type products are known to provide superior dust extraction and/or anti-loading properties, when used with substrates known to severely load traditional abrasives. However, cut and/or life performance are still lacking. Thus, there is a need for a net type product that provides enhanced cut and/or life performance while demonstrating superior dust extraction.
  • FIG. l is a perspective view of an abrasive article according to one example of the present disclosure.
  • FIGS. 2 is a side cross-sectional view of abrasive articles according to various embodiments of the present disclosure.
  • FIG. 3 is a schematic showing the step-wise construction of abrasive articles according to various embodiments of the present disclosure.
  • FIGS. 4A-4I are side cross-sectional views of a portion of an abrasive article according to various embodiments of the present disclosure.
  • FIGS. 5-6 are side cross-sectional views of abrasive articles according to embodiments of the present disclosure.
  • FIGS. 7A-7D illustrate examples of laminated backings.
  • FIGS. 8A-8C illustrate cross-sectional views of coated abrasive articles in accordance with embodiments of the present invention.
  • FIGS. 9A-9B illustrate a laminated backing in accordance with an embodiment of the present invention.
  • FIG. 10 illustrates a method for making a coated abrasive article in accordance with an embodiment of the present invention.
  • coated abrasive articles have abrasive particles secured to a backing.
  • Coated abrasive articles can include a backing having two major opposed surfaces and an abrasive layer secured to one of the major surfaces.
  • the abrasive layer typically includes abrasive particles and a binder for securing the abrasive particles to the backing.
  • One common construction is a backing with a resin-based binder.
  • phenolic resin and polyethylene terephthalate (PET) film are two common materials useful for making abrasive products.
  • PET polyethylene terephthalate
  • phenolic resins do not bond well to plain, untreated polyester or PET films.
  • Embodiments described herein are directed to an abrasive article that not only retains the dust-extraction advantages of an abrasive on a net-type backing, but also demonstrates abrasive performance (cut and/or life) advantages of a conventional coated abrasive article.
  • This combination of benefits dust extraction and cut and/or life is possible because the construction of the abrasive articles described herein allows for coating abrasive on a greater variety of backing materials, with better performance, through the application of a laminated layer between the backing material and the resin coat.
  • the present disclosure provides articles that include a laminate that can serve as a primer layer for a backing, for example, for improving the adhesion to a make resin layer, for example, a phenolic resin layer, in an abrasive article.
  • FIG. l is a perspective view of one example of an abrasive article referred to by the numeral 100.
  • the abrasive article 100 includes: a substrate 110 comprising strands forming first void spaces 270 between the strands (see FIG. 2); and an abrasive layer 120 comprising a laminate joined to the substrate 110; a resin joined to the laminate opposite the fabric substrate 110; abrasive particles joined to the resin; and a plurality of void spaces extending through the laminate coinciding with void spaces in the substrate 110.
  • substrate 110 is a fabric substrate.
  • the plurality of void spaces extending through the laminate coinciding with void spaces in the fabric substrate 110 allow for an air flow through the article 100 at a rate of, e.g., at least 0.1 L/s (e.g. at least 0.2 L/s, at least 0.4 L/s, at least 0.6 L/s, at least 1 L/s; or about 0.1 L/s to about 1 L/s, about 0.25 L/s to about 0.75 L/s, about 0.5 L/s to about 1 L/s, about 1 L/s to about 2 L/s, about 1.5 L/s or about 3 L/s), such that, when in use, dust can be removed from an abraded surface through the abrasive article.
  • at least 0.1 L/s e.g. at least 0.2 L/s, at least 0.4 L/s, at least 0.6 L/s, at least 1 L/s; or about 0.1 L/s to about 1 L/s, about 0.25 L/s to about 0.75 L/s, about
  • FIG. 1 shows a relatively simple pattern that can be created with the abrasive layers 120.
  • the conceivable patterns are many.
  • abrasive articles 100 having various patterns in the abrasive layer 120 are described and illustrated in co-pending U.S. Provisional Patent 62/803,871 filed on February 11, 2019.
  • the abrasive layers 120 can comprise a plurality of pattern elements 120, which may or may not be repeated across the surface of the abrasive article 100.
  • Each pattern element 120 can be comprised of one or more sub-elements.
  • Different pattern elements 120 within the same abrasive article may be provided with the same or different abrasive particles 250 or other additives (for example, different abrasive grades, blends of abrasive particles 250, fillers, grinding aids, etc.) as desired for a given application.
  • abrasive articles could take any form (for example, sheets or belts).
  • FIG. 2 shows a cross-section of an abrasive article referred to by the numeral
  • the abrasive article 100 includes: a fabric substrate 110 comprising strands 260 forming first void spaces 270 between the strands 260; a laminate 230 joined to the fabric substrate 110; a cured resin composition 240 (e.g., the cured product of a phenolic resin) joined to the laminate 230 opposite the fabric substrate 110; abrasive particles 250 joined to the cured resin composition 240; and a plurality of second void spaces 280 extending through the laminate coinciding with first void spaces 270 in the fabric substrate 110.
  • a fabric substrate 110 comprising strands 260 forming first void spaces 270 between the strands 260
  • a laminate 230 joined to the fabric substrate 110
  • a cured resin composition 240 e.g., the cured product of a phenolic resin
  • the fabric substrate 110 comprises laminate 230A, which does not comprise cured resin composition 240 joined to laminate 230A.
  • the abrasive particles 250 are at least partially embedded in the cured resin composition 240.
  • the term “at least partially embedded” generally means that at least a portion of an abrasive particle is embedded in the cured resin composition, such that, the abrasive particle is anchored in the cured resin composition.
  • abrasive particles 250 are coated onto the laminate 230 together in the form of a slurry composition.
  • abrasive particles 250 can optionally be oriented by influence of a magnetic field prior to the resin 240A being cured.
  • the abrasive article 100 comprises a first side 210 joined to the laminate 230; and a second side 212 opposite the first side 210.
  • the second side 212 can include one part of a two-part hook and loop attachment system (not shown)
  • FIG. 3 shows an example of one method by which the abrasive article 100 shown in FIG. 1 can be constructed in step-wise fashion.
  • laminate 230 is joined to fabric substrate 110 comprising strands 260 forming first void spaces 270 between the strands 260.
  • the laminate 230 can be joined to the fabric substrate 110 by any suitable means, including by first applying a suitable adhesive layer (not shown) onto the substrate 110, followed by applying the laminate 230; by melting the laminate material onto the fabric substrate 110; printing the laminate 230 onto the fabric substrate 110; or combinations of any of the foregoing methods for joining the laminate 230 to the fabric substrate 110.
  • the laminate 230 functions to, among other things, provide a substantially flat landing for uncured (or partially cured) resin composition 240A, such that uncured resin composition 240A that is deposited on the laminate 230 remains on the surface and does not have an opportunity to, e.g., move into the spaces 270 between strands 260 of fabric substrate 110.
  • uncured resin composition 240A is joined to the laminate
  • the uncured resin composition 240A can be joined to laminate 230 by any suitable means, including by using a (rotary) stencil/screen printing roll, flatbed screen/stencil printing or by directly printing the uncured resin composition 240A onto the laminate 230 or by using combinations of two or more suitable methods (e.g., extrusion die coating, curtain coating, knife coating, gravure coating, and spray coating) for joining the uncured resin composition 240A to the laminate 230 opposite the fabric substrate 110
  • suitable methods e.g., extrusion die coating, curtain coating, knife coating, gravure coating, and spray coating
  • abrasive particles 250 are joined to the uncured resin composition 240A by any suitable method, including drop, electrostatic, magnetic, and other mechanical methods of mineral coating.
  • abrasive particles 250 can be deposited onto uncured resin composition 240A by simply dropping the abrasive particles 250 onto the uncured resin composition 240A; by electrostatically depositing abrasive particles 250 onto the uncured resin composition 240A; or by using combinations of two or more suitable methods for joining the abrasive particles 250 to the uncured resin composition 240A.
  • the abrasive particles 250 can optionally be oriented under the influence of a magnetic field prior to the resin 240A being cured, as earlier indicated.
  • the uncured resin composition 240A is cured, this way abrasive particles 250 are at least partially embedded in the cured resin composition 240 and are substantially permanently attached.
  • Uncured resin composition 240A can be cured to form cured resin 240 by any applicable curing mechanism, including thermal cure, photochemical cure, moisture-cured or combinations of two or more curing mechanism. But if the uncured resin composition 240A is cured by any means that does not include heating, a fifth step (not shown) may be necessary to effect migration of laminate 230 away from the void spaces 270 between strands 260.
  • laminate 230 migrates away from the first void spaces 270 between strands 260, thereby opening a plurality of second void spaces 280 extending through the laminate coinciding with first void spaces 270.
  • the laminate 230 therefore avoids the first void spaces 270 when cured resin composition 240 is absent above the first void spaces 270.
  • the laminate 230 covers the first void spaces 270 when the cured resin composition 240 is above the first void spaces 270.
  • FIG. 3 shows an example of one method by which the abrasive article 100 shown in FIG. 1 can be constructed in step-wise fashion
  • methods are also contemplated where one or more of the steps described herein can be accomplished in a single step or wherein certain steps can be performed in an order different than what is shown in FIG. 3.
  • uncured or partially cured resin composition 240A could be joined/deposited to laminate 230 first to form a first composite.
  • the first composite material comprising uncured or partially cured resin 240A and laminate 230 could then be joined in a single step to fabric substrate 110, followed by Steps 3 and 4.
  • laminate 230 and uncured or partially cured resin composition 240A could be co-deposited (e.g., co extruded) onto fabric substrate 110, followed by Steps 3 and 4.
  • abrasive particles 250 can be joined with uncured or partially cured resin composition 240A first, to form a second composite.
  • uncured or partially cured resin composition 240A could be joined/deposited on a removable liner first.
  • the abrasive particles 250 could then be joined/deposited onto the uncured or partially cured resin composition 240A to form the second composite.
  • the second composite material comprising abrasive particles 250 joined with uncured or partially cured resin composition 240A could then be joined/deposited to laminate 230 to make a third composite material.
  • the third composite material comprising abrasive particles 250 joined with uncured or partially cured resin composition 240A, which is in turn joined to laminate 230, could then be joined in a single step to fabric substrate 110, followed by Steps 3 and 4.
  • FIGS. 4A-4I show the various permutations (not exhaustive) that can occur when the laminate 230 that is not covered by cured resin composition 240 migrates away from the first void spaces 270 between strands 260.
  • the laminate 230 can at least partially wrap around the strands 260 to create second void spaces 280, thus leaving open the first void spaces 270 as shown in FIGS. 4B, 4D, 4F, 4G, 4H, and 41.
  • the laminate 230 extends over only the strands 260, not over first void spaces 270.
  • the laminate 230 can wrap around some stands 260 and not others, as shown in FIG. 41.
  • FIG. 5 shows one example of an abrasive article referred to by the numeral
  • FIG. 200 which incorporates all of the features shown in FIG. 1, which will not be discussed again for the sake of brevity, but also a size coat 510 having size coat void spaces 520, which coincide with second void spaces 280.
  • FIG. 6 shows one example of an abrasive article referred to by the numeral 300, which incorporates all of the features shown in FIG.5, which will not be discussed again for the sake of brevity, but also a supersize coat 610 having supersize coat void spaces 620, which coincide with size coat void spaces 520 and second void spaces 280.
  • the layer configurations described herein are not intended to be exhaustive, and it is to be understood that layers can be added or removed with respect to any of the examples depicted in FIGS. 1-3.
  • laminate 230 can be any material (for example, a nonwoven or woven web or a film) that provides a landing surface for uncured (or partially cured) resin composition 240A, such that uncured resin composition 240A that is deposited on the laminate 230 remains on the surface and does not have an opportunity to, e.g., move into the void spaces 270 between strands 260 of fabric substrate 110; but at the same time migrates away from the void spaces 270 between strands 260, e.g., during the curing process that forms cured resin composition 240, thereby opening a plurality of second void spaces 280 extending through the laminate coinciding with first void spaces 270.
  • material for example, a nonwoven or woven web or a film
  • Suitable materials for laminate 230 include hot-meltable materials, including polyester hot-meltable materials (e.g., HM4185 Polyester Hot Melt Adhesive available from Bostik, Wauwatosa, WI), polyamide, ethylene and acrylic acid (EAA) copolymer, ethyl methyl acetate or ethyl vinyl acetate.
  • the laminate 230 may be provided, for example, in the form of a continuous non- apertured sheet, or as a continuous apertured sheet whereby apertures are provided in areas adjacent to or surrounding pattern elements.
  • Laminate 230 should adhere both to the mesh backing layer and to the resin layer. Failure at either layer will cause abrasive particles to delaminate from the backing. This is particularly important for extrusion lamination of a hot melt film, which results in a non-porous laminate that separates the make layer from the backing.
  • composition and process for adhering the laminate to the backing layer can affect performance of the abrasive article. Some important parameters include re opening of the laminate during curing of the make resin, sufficient adhesion of the laminate to a backing, and flatness of the laminate.
  • Laminate re-opening can be controlled by selecting a material with a melting point lower than the melting point or the degradation temperature of the resin coated above, but high enough that the laminate will not melt or wash away during resin cure and abrasive use. If the melting point of the laminate is too low it can also cause sagging of the laminate / make layer in open areas, which can cause significant surface defects with the application of the make coat. Additionally, the thickness of a laminate coating is important - if the coating is too thick it will not open. If it is too thin, the resin may bleed through to the backing layer. [0036] Adhesion to the mesh backing can reduce delamination of an abrasive article.
  • Adhesion can be increased through extrusion temperature, nip pressure, die position, and the chemistry of the laminate.
  • FIGS. 7 A and 7B illustrate two different laminated backings.
  • FIG. 7 A illustrates a poorly laminated mesh backing 710 where the laminate is not a continuous layer.
  • FIG. 7B illustrates a laminated mesh backing 720 resulting from co-extruding a mesh backing with laminate.
  • Laminated backing 720 has a flatter surface than laminated backing 710, and the laminate layer of laminated backing 720 is more continuous along the surface.
  • Extrusion can increase laminate re-opening, reduce delamination of abrasive particles and can also reduce the creation of weak points between the laminate and the mesh backing. However, extrusion does not result in a porous laminate. This prevents make resin from penetrating the laminate layer and contacting the mesh web after coating, and also results in a higher surface tension, making the re-opening process for the laminate layer prone to incomplete reopening and delamination if the incorrect conditions are used.
  • FIG. 7C illustrates incomplete opening of an extruded laminated backing 730.
  • FIG. 7D illustrates delamination of a make coat and abrasive particles on an extruded laminated backing 740.
  • Improving lamination re-opening, adhesion and flatness can provide an abrasive article with better feature resolution and reduce bleed-through of the resin. Improvement in these areas can be achieved by modifying the chemical make-up of the laminate and the process conditions for applying the laminate.
  • the laminate comprises a hot-melt polymer resin such as polyamide, polyester, polyethylene acrylic acid] copolymer, poly(ethylene-acrylate) copolymer, poly-(ethyl methyl acetate) copolymer, polyolefins, polyurethane polyethyl vinyl acetate, polyethylene acrylate copolymer, ethylene methacrylic acid copolymer, acid- modified ethylene terpolymers, anhydride-modified ethylene acylate, vinyl acetate polymer or a blend thereof.
  • the laminate may also contain an additive, such as ethyl acetoacetate. In one embodiment, the laminate has at least 5% ethyl acetoacetate.
  • the laminate material has a melting temperature between about 50°C to about 150°C. In another embodiment the laminate material has a melting temperature between about 80°C to about 110°C.
  • the coating weight of the laminate is between about 10 and about 60 grams per square meter (gsm). In one embodiment the coating weight of the laminate is between about 15 gsm and about 40 gsm. In one embodiment, the coating weight of the laminate is between about 15 gsm and about 25 gsm.
  • the coating thickness of the laminate in one embodiment, is between about 10 pm and about 50 pm. In one embodiment the coating thickness of the laminate is between about 10 pm and about 20 pm.
  • mesh-based backings are suitable for applications where dust collection is a priority, it is also expressly contemplated that laminates of embodiments described herein may also be suitable for other coated abrasive article constructions used in other applications.
  • a coated abrasive article generally has a backing with an abrasive layer which includes a make layer, a size layer, and abrasive particles.
  • the make layer including a first binder precursor
  • the make layer can be applied to a major surface of the backing.
  • Abrasive particles are then at least partially embedded into the make layer (for example, by electrostatic coating), and the first binder precursor is cured (that is, crosslinked) to secure the particles to the make layer.
  • a size layer, including a second binder precursor can be applied over the make layer and abrasive particles, followed by curing of the second binder precursor and possibly further curing of the first binder precursor.
  • Another type of coated abrasive article is formed by applying an abrasive layer, provided as a slurry comprised of binder precursor and abrasive particles, onto a major surface of a backing, and then curing the binder precursor.
  • Some examples of typical backing treatments are a backsize layer (that is, a coating on the major surface of the backing opposite the abrasive layer), a presize layer or a tie layer (that is, a coating on the backing disposed between the abrasive layer and the backing), and/or a saturant that saturates the backing.
  • a subsize is similar to a saturant, except that it is applied to a previously treated backing.
  • Coating of a backing treatment composition can be performed in a variety of ways including brushing, spraying, roll coating, curtain coating, gravure coating, and knife coating.
  • the coated backing may then be processed for a time at a temperature sufficient to dry and at least partially crosslink the coating to form the primer layer on the backing.
  • a backing material undergoes a surface treatment.
  • Useful surface treatments include electrical discharge in the presence of a suitable reactive or non-reactive atmosphere (e.g., plasma, glow discharge, corona discharge, dielectric barrier discharge or atmospheric pressure discharge); ultraviolet light exposure, electron beam exposure, flame discharge, and scuffing.
  • a suitable reactive or non-reactive atmosphere e.g., plasma, glow discharge, corona discharge, dielectric barrier discharge or atmospheric pressure discharge
  • ultraviolet light exposure e.g., ultraviolet light exposure
  • electron beam exposure e.g., flame discharge, and scuffing.
  • the surface treatment can be applied as the polyester film backing is being made or in a separate process.
  • the polyester film backing is surface-treated using corona discharge.
  • An example of a useful corona discharge process is described in U.S. Pat. No. 5,972,176 (Kirk et ah).
  • abrasive layer may partially separate from the backing during abrading, resulting in the release of abrasive particles. This phenomenon is known in the abrasive art as "shelling". In most cases, shelling is undesirable because it results in a loss of performance.
  • a tie layer is sometimes disposed between the backing and the abrasive layer. See, for example, U.S. Pat. Nos. 5,304,224 (Harmon) and 5,355,636 (Harmon).
  • a tie layer has been used to address the problem of shelling in some coated abrasive articles, for example, U.S. Pat. No. 7,150,770 (Keipert et al.)
  • the primer layer can include one or more additives, if desired.
  • the primer layer useful for practicing the present disclosure includes at least one of an organic solvent, a surfactant, an emulsifier, a dispersant, a catalyst, a rheology modifier, a density modifier, a cure modifier, a diluent, an antioxidant, a heat stabilizer, a flame retardant, a plasticizer, filler, a polishing aid, a pigment, a dye, an adhesion promoter, antistatic additives.
  • the presence or lack of certain of these additives can reduce cost, control viscosity, or improve physical properties.
  • the primer layer comprises a surfactant.
  • a laminate layer may be applied to a coated abrasive article in addition to, or instead of, a primer layer. Applying a laminate layer to a backing can provide additional functionality to the coated abrasive article. However, as illustrated in the Examples, a laminate can also replace a primer layer or provide a functional improvement to the backing.
  • FIGS. 8A-8C illustrate cross-sectional views of coated abrasive articles in accordance with embodiments of the present invention.
  • an abrasive article 800 has a backing 810, a laminate layer 820 secured to major surface 815 of backing 810 and abrasive layer 830 secured to laminate 820.
  • Abrasive layer 830 includes abrasive particles 860 secured to the article 800 by make layer 840 and size layer 850.
  • Backing 810 in one embodiment, is pretreated, for example with a primer, for example, a backsize layer, a presize layer, a tie layer, a saturant, and / or a subsize treatment.
  • a primer, or pretreatment of a backing is considered to be different than applying a laminate to a backing.
  • primers and pretreatments are applied as an aqueous or solvent-based mixture and react to form a film-like coating. They are not usually applied as part of an extruding or coating process, but instead require treatment, then drying and evaporation of the solvent. Additionally, the laminate is visible as a distinct layer, while primers and pretreatments do not result in a continuous film or phase. Primers and pretreatments will not result in a continuous phase on a mesh substrate because the viscosity is too low.
  • the laminate is also formed of a high molecular weight polymer that is self- sealed with definable mechanical strength.
  • the abrasive layer may comprise abrasive particles dispersed in a binder, in some embodiments, a phenolic layer.
  • abrasive article 900 has backing 910, laminate 920 secured to major surface 915 of backing 910, and abrasive layer 930 secured to laminate 920.
  • Abrasive layer 930 includes abrasive particles 960 dispersed in binder 940, in some embodiments, a phenolic layer.
  • a slurry comprising a binder precursor (in some embodiments, phenolic resin) and abrasive particles is typically applied to a major surface of the backing, and the binder precursor is then at least partially cured.
  • Backing 910 in one embodiment, is pretreated, for example with a primer, for example, a backsize layer, a presize layer, a tie layer, a saturant, and / or a sub size treatment.
  • an abrasive article according to the present disclosure may comprise a structured abrasive article.
  • structured abrasive article 1000 has backing 1010, laminate 1020 secured to major surface 1015 of backing 1010, and abrasive layer 1030 secured to primer layer 1020.
  • Abrasive layer 1030 includes a plurality of precisely-shaped abrasive composites 1055.
  • the abrasive composites comprise abrasive particles 1060 dispersed in binder 1050.
  • Backing 1010 in one embodiment, is pretreated, for example with a primer, for example, a backsize layer, a presize layer, a tie layer, a saturant, and / or a subsize treatment.
  • a slurry comprising a binder precursor (in some embodiments, phenolic resin) and abrasive particles may be applied to a tool having a plurality of precisely-shaped cavities therein.
  • the slurry is then at least partially polymerized and adhered to the primer layer, for example, by adhesive or polymerization of the slurry.
  • the abrasive composites may have a variety of shapes including, for example, those shapes selected from the group consisting of cubic, block-like, cylindrical, prismatic, pyramidal, truncated pyramidal, conical, truncated conical, cross-shaped, and hemispherical.
  • FIGS 9A and 9B illustrate an example backing for an abrasive article in accordance with an embodiment of the present invention.
  • Backing 1100 includes a backing material 1130 with a laminate layer 1120.
  • Backing material 1130 may also be pretreated with a primer solution or primer layer prior to application of laminate layer.
  • the abrasive articles of the various embodiments described herein include a backing substrate 1100.
  • Backing substrate 1100 may be constructed from any of a number of materials known in the art for making coated abrasive articles.
  • backing substrate can be any of fabric, open-weave cloth, knitted fabric, porous cloth, loop materials, unsealed fabrics, open or closed cell foams, a nonwoven fabric, a spun fiber, a film, a perforated film or any other suitable backing material.
  • a fabric backing may include cloth (e.g., cloth made from fibers or yarns comprising polyester, nylon, silk, cotton, and/or rayon, which may be woven, knit or stitch bonded) or scrim. Many of these materials can have an uneven or rough surface. Applying a laminate to a backing material prior to applying a make coat can create a more continuous, flatter and smoother surface for abrasive coating than would be available without a laminate.
  • a suitable backing substrate 1100 needs to meet criteria for an abrasive application. For example, depending on an application a backing 1100 may need a particular stiffness and / or weight. However, all backings need to have a high adhesion for a make resin. Additionally, backings should be smooth and flat to promote adhesion of abrasive particles and reduce shelling.
  • a backing substrate 1100 should also be a low-cost material.
  • Several potential low-cost backing candidates such as those with open or porous structures that are not easily sealed or have low adhesion to make resin, are often discarded as potential backing materials.
  • application of a laminate may improve adhesion, smoothness and flatness of such backing candidates.
  • a laminate may also provide additional functionality such as anti-static or anti-loading functionality.
  • Coated abrasive articles such as those described herein can be formed in a variety of ways, but generally involve coating a backing with one or more layers of material.
  • FIG. 10 illustrates a method for making a coated abrasive article in accordance with an embodiment of the present invention.
  • a backing is provided.
  • the backing may be naturally flexible or stiff.
  • a flexible backing may comprise cloth (e.g., cloth made from fibers or yarns comprising polyester, nylon, silk, cotton, and/or rayon, which may be woven, knit or stitch bonded) and scrim, for example.
  • the flexible backing may have a rough surface and may not be flat.
  • the backing may undergo a pretreatment, such as a plasma pretreatment 1212 or a corona pre-treatment 1214. Additionally, the backing may undergo application of another pretreatment 1216, such as application of a backsize layer, a presize layer, a tie layer, a saturant, and / or a subsize treatment.
  • the polyester film backing comprises polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the polyester film backing has a uniform composition throughout its thickness.
  • PET or any of the polyesters described above may be included in a layer of a multilayer film backing. In these cases, the polyester layer would be in contact with the laminate layer.
  • the polyester backing can be a film backing described above.
  • fibrous backings are also useful in the abrasive articles described herein.
  • the polyester backing is a nonwoven.
  • Nonwoven abrasive articles, such as a spunbound backing typically include an open porous lofty polymer filament structure having abrasive particles distributed throughout the structure and adherently bonded therein by an organic binder, in some embodiments, a phenolic resin as described above in any of its embodiments.
  • filaments include polyester fibers made from any of the polyesters described above in connection with the polyester film backing.
  • Nonwoven abrasives include nonwoven webs suitable for use in abrasives.
  • the term “nonwoven” refers to a material having a structure of individual fibers or threads that are interlaid but not in an identifiable manner such as in a knitted fabric.
  • the nonwoven web comprises an entangled web of fibers.
  • the fibers may comprise continuous fiber, staple fiber, or a combination thereof.
  • the nonwoven web may comprise staple fibers having a length of at least about 20 mm, at least about 30 mm, or at least about 40 mm, and less than about 110 mm, less than about 85 mm, or less than about 65 mm, although shorter and longer fibers (e.g., continuous filaments) may also be useful.
  • the fibers may have a fineness or linear density of at least about 1.7 decitex (dtex, i.e., grams/10000 meters), at least about 6 dtex, or at least about 17 dtex, and less than about 560 dtex, less than about 280 dtex, or less than about 120 dtex, although fibers having lesser and/or greater linear densities may also be useful. Mixtures of fibers with differing linear densities may be useful, for example, to provide an abrasive article that upon use will result in a specifically preferred surface finish. If a carded or airlaid nonwoven is used, the filaments may be of substantially larger diameter, for example, up to 2 mm or more in diameter.
  • the fibers may be tensilized and crimped but may also be continuous filaments such as those formed by an extrusion process (e.g. spunbond fibers). Combinations of fibers may also be used.
  • the nonwoven web may be manufactured, for example, by conventional air laid, carded, stitch bonded, spun bonded, wet laid, and/or melt blown procedures. Air laid nonwoven webs may be prepared using equipment such as, for example, that available under the trade designation "RANDO WEBBER" commercially available from Rando Machine Company of Ard, N.Y. Further details concerning nonwoven abrasive articles, abrasive wheels and methods for their manufacture may be found, for example, in U.S. Pat. No.
  • polyester film backings useful for practicing some aspects the present disclosure, the film backing would be considered monolithic (that is, having a generally uniform film composition) and is not fibrous. Particularly, the film backing is not a nonwoven material.
  • the polyester film backing can be described as a dense film and not an open, lofty, fibrous web.
  • polyester film backings useful for practicing some aspects of the present disclosure have a Gurley porosity of more than 50 seconds when measured according to FTMS No. 191, Method 5452 (12/31/68) (as referred to in the Wellington Sears Handbook of Industrial Textiles by E. R. Kaswell, 1963 ed., p 575) using a Gurley Permeometer (available from Teledyne Gurley, Inc., Troy, N. Y.).
  • the Gurley Permeometer measures the amount of time, in seconds, required for 100 cubic centimeters of air to pass through the backing material.
  • Polyester film backings useful for practicing some aspects of the present disclosure can have a variety of thicknesses.
  • the thickness of the polyester film backing is in a range from 1 micrometer to 500 micrometers, 10 micrometers to 350 micrometers, 25 micrometers to 250 micrometers, or 35 micrometers to 200 micrometers.
  • the polyester film backing useful for practicing the present disclosure may be oriented, either uniaxially or biaxially. Orientation of a film at a temperature above its glass transition temperature can be useful for enhancing at least one of the stiffness, modulus, or creep resistance of the film. Orientation can conveniently be carried out by conventional methods such as mechanical stretching (drawing) or tubular expansion with heated air or gas. Examples of useful draw ratios are in the range of 2.5 to 6 times in the machine, cross-machine direction, or both the machine and cross-machine directions. Larger draw ratios (for example, up to about 8 times) may also be useful if the film is oriented in only one direction. For biaxially oriented film backings, the film may be stretched equally in the machine and cross-machine directions or unequally in the machine and cross-machine directions.
  • a laminate is applied to the backing.
  • the laminate may be applied, in one embodiment, as a film. For example, it may be applied as a blown melty film 1222 to a backing.
  • the laminate is extruded onto a backing 1224. Extrusion may comprise coextrusion of the laminate with the backing as well as extruding a laminate layer onto an existing backing. Other application methods are also envisioned.
  • the laminate may result in changed properties of the backing, once applied, as indicated in block 1232.
  • the laminate may increase the stiffness of a backing.
  • the laminate may increase the smoothness and / or flatness of the backing.
  • the laminate may also provide functionality, such as anti-loading properties, as indicated in block 1234, or anti-static properties, as indicated in block 1236. Anti-loading and anti-static properties are achieved by increasing the conductivity of the backing, which is achieved by using a conductive material for the laminate or a conductive additive.
  • the laminate may also promote adhesion, as indicated in block 1238, between the make resin and the backing.
  • the laminate may also directly or indirectly provide other benefits, as indicated in block 1242.
  • the increased flatness of a laminated backing may reduce shelling of abrasive particles during use.
  • a make coat may be applied.
  • the make coat is applied under conditions sufficient to cause reopening of the laminate layer to form voids, as described with respect to FIGS. 1-6. Applying the make coat may also comprise a curing step to allow the make coat to cure.
  • a make coat and size coat in the abrasive articles of the present disclosure in any of their embodiments may be made from the same or different materials.
  • these materials include amino resins, alkylated urea-formaldehyde resins, melamine- formaldehyde resins, and alkylated benzoguanamine-formaldehyde resin, acrylate resins (including acrylates and methacrylates) such as vinyl acrylates, acrylated epoxies, acrylated urethanes, acrylated polyesters, acrylated acrylics, acrylated polyethers, vinyl ethers, acrylated oils, and acrylated silicones, alkyd resins such as urethane alkyd resins, polyester resins, reactive urethane resins, epoxy resins such as bisphenol epoxy resins, isocyanates, isocyanurates, polysiloxane resins (including alkylalkoxysilane resins), reactive vinyl resins, phenolic resin
  • the resins may be provided as monomers, oligomers, polymers, or combinations thereof.
  • the primer layer improves adhesion between the polyester backing and the make layer.
  • the make layer is an alkylated urea-formaldehyde resin, and the size layer can be made from any of the resins described above.
  • the make layer is a phenolic layer as described above in any of its embodiments, and the size layer can be made from any of the resins described above.
  • both the make layer and the size layer are made from phenolic resins, which may be combined with a latex including any of those described above in any of the ratios described above.
  • Suitable phenolic resins are generally formed by condensation of phenol or an alkylated phenol (e.g., cresol) and formaldehyde, and are usually categorized as resole or novolac phenolic resins.
  • Novolac phenolic resins are acid-catalyzed and have a molar ratio of formaldehyde to phenol of less than 1:1.
  • Resole (also resol) phenolic resins can be catalyzed by alkaline catalysts, and the molar ratio of formaldehyde to phenol is greater than or equal to one, typically between 1.0 and 3.0, thus presenting pendant methylol groups.
  • Alkaline catalysts suitable for catalyzing the reaction between aldehyde and phenolic components of resole phenolic resins include sodium hydroxide, barium hydroxide, potassium hydroxide, calcium hydroxide, organic amines, and sodium carbonate, all as solutions of the catalyst dissolved in water.
  • Resole phenolic resins are typically coated as a solution with water and/or organic solvent (e.g., alcohol). Typically, the solution includes about 70 percent to about 85 percent solids by weight, although other concentrations may be used. If the solids content is very low, then more energy is required to remove the water and/or solvent. If the solids content is very high, then the viscosity of the resulting phenolic resin is too high which typically leads to processing problems.
  • water and/or organic solvent e.g., alcohol
  • Phenolic resins are well-known and readily available from commercial sources.
  • Examples of commercially available resole phenolic resins useful in practice of the present disclosure include those marketed by Durez Corporation under the trade designation VARCUM (e.g., 29217, 29306, 29318, 29338, 29353); those marketed by Ashland Chemical Co. of Bartow, Florida under the trade designation AEROFENE (e.g., AEROFENE 295); and those marketed by Kangnam Chemical Company Ltd. of Seoul, South Korea under the trade designation PHENOLITE (e.g., PHENOLITE TD-2207).
  • VARCUM e.g., 29217, 29306, 29318, 29338, 29353
  • AEROFENE e.g., AEROFENE 295
  • PHENOLITE e.g., PHENOLITE TD-2207
  • the uncured or partially cured resin composition 240A that is converted to cured resin composition 240 can comprise additional components, including polyurethane dispersions, such as aliphatic and/or aromatic polyurethane dispersions.
  • polyurethane dispersions can comprise a polycarbonate polyurethane, a polyester polyurethane, or polyether polyurethane.
  • the polyurethane can comprise a homopolymer or a copolymer.
  • polyurethane dispersions examples include aqueous aliphatic polyurethane emulsions available as NEOREZ R-960, NEOREZ R-966, NEOREZ R-967, NEOREZ R-9036, and NEOREZ R-9699 from DSM Neo Resins, Inc., Wilmington, Massachusetts; aqueous anionic polyurethane dispersions available as ESSENTIAL CC4520, ESSENTIAL CC4560, ESSENTIAL R4100, and ESSENTIAL R4188 from Essential Industries, Inc., Merton, Wisconsin; polyester polyurethane dispersions available as SANCURE 843, SANCURE 898, and SANCURE 12929 from Lubrizol, Inc.
  • aqueous aliphatic polyurethane emulsions available as NEOREZ R-960, NEOREZ R-966, NEOREZ R-967, NEOREZ R-9036, and NEOREZ R-9699 from DSM Neo Resins, Inc
  • aqueous aliphatic self-crosslinking polyurethane dispersion available as TURBOSET 2025 from Lubrizol, Inc.
  • an aqueous anionic, co solvent free, aliphatic self-crosslinking polyurethane dispersion available as BAYHYDROL PR240 from Bayer Material Science, LLC of Pittsburgh, Pennsylvania.
  • Additional suitable commercially available aqueous polyurethane dispersions include:
  • Alberdingk U 6150 a solvent-free, aliphatic polycarbonate polyurethane dispersion available from Alberdingk Boley GmbH, Krefeld, Germany, having a viscosity ranging from 50-500 mPa s (according to ISO 1652, Brookfield RVT Spindle 1/rpm 20/factor 5), an elongation at break of about 200%, and a Koenig hardness after curing of about 65-70 s;
  • Alberdingk U 6800 an aqueous, solvent-free, colloidal, low viscosity dispersion of an aliphatic polycarbonate polyurethane without free isocyanate groups available from Alberdingk Boley GmbH, Krefeld, Germany, having a viscosity ranging from 20-200 mPa s (according to ISO 2555, Brookfield RVT Spindle 1/rpm 50/factor 2), an elongation at break of about 500%, and a Koenig hardness after curing of about 45 seconds; [0087] 3) Alberdingk U 6100, an aqueous, colloidal, anionic, low viscosity dispersion of an aliphatic polyester-polyurethane without free isocyanate groups available from Alberdingk Boley GmbH, Krefeld, Germany, having a viscosity of 20-200 mPa s (according to ISO 1652, Brookfield RVT Spindle 1/rpm 50 factor 2), an a viscosity
  • Alberdingk U9800 a solvent-free aliphatic polyester polyurethane dispersion available from Alberdingk Boley GmbH, Krefeld, Germany having a viscosity of 20-200 mPa s (according to ISO 1652, Brookfield RVT Spindle 1/rpm 20/factor 5), and elongation at break of about 20-50%, and a Koenig hardness after curing of about 100-130 s; and
  • Optional additives for polyurethane dispersions, as well as for curable compositions in general, include rheological modifiers, anti-foaming agents, water-based latexes and crosslinkers may be added to the aqueous polyurethane dispersion.
  • Suitable crosslinkers include, for example, polyfunctional aziridine, methoxymethylolated melamine, urea resin, carbodiimide, polyisocyanate and blocked isocyanate. Additional water may also be added to dilute the formulation of the aqueous polyurethane dispersion, the phenolic resin, or combinations thereof.
  • Curable compositions can be made, for example, from an aqueous polyurethane dispersion and a water-based latex.
  • the aqueous polyurethane dispersion contains less than about 20%, 10%, 5% or 2% organic solvent. In a specific embodiment, the aqueous polyurethane dispersion is substantially free of organic solvent. In some embodiments, it has been found that the aqueous polyurethane dispersion comprises at least about 7%, 15%, or 20% solids, and no greater than about 50% or 60% solids. The aqueous polyurethane dispersion may comprise no greater than about 80%, 85%, or 93% water. In some embodiments, it has been found that the aqueous polyurethane dispersion forms a film having a Koenig hardness of at least about 30 and no greater than about 200 seconds when measured according to ASTM 4366- 16.
  • the aqueous polyurethane dispersion may have a surface tension that is at least about 50% of the surface tension of water and no greater than about 300% of the surface tension of water. And in some embodiments, the aqueous polyurethane dispersion may have a viscosity of at least about 10 mPa s to no greater than about 600 mPa s, or at least about 70%, 80% or 90% of the viscosity of water and no greater than about 600%, 500% or 400% of the viscosity of water.
  • the aqueous polyurethane dispersion may comprise at least about 100, 1000, or even at least about 10000 parts per million (ppm) of dimethylolpropionic acid.
  • Optional additives including rheological modifiers, anti-foaming agents, and crosslinkers may be added to the aqueous polyurethane dispersion, for example.
  • Suitable crosslinkers include, for example, polyfunctional aziridine, methoxymethylolated melamine, urea resin, carbodiimide, polyisocyanate and blocked isocyanate. Additional water may be added to reduce viscosity of the aqueous polyurethane dispersion.
  • organic solvent e.g., propyl methyl ether or isopropanol
  • addition of up to 10 percent by weight of organic solvent e.g., propyl methyl ether or isopropanol
  • organic solvent e.g., propyl methyl ether or isopropanol
  • the dispersed polyurethane can include at least one polycarbonate segment, although this is not a requirement.
  • the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 91 to 99 percent by weight phenolic resin to 9 to 1 percent by weight of polyurethane. In some embodiments, the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 56 to 91 percent by weight phenolic resin to 44 to 9 percent by weight of polyurethane. In some embodiments, the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 62 to 91 percent by weight phenolic resin to 38 to 9 percent by weight of polyurethane.
  • the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 69 to 91 percent by weight phenolic resin to 31 to 9 percent by weight of polyurethane. In some embodiments, the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 56 to 83 percent by weight phenolic resin to 44 to 17 percent by weight of polyurethane. In some embodiments, the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 56 to 76 percent by weight phenolic resin to 44 to 24 percent by weight of polyurethane. In some embodiments, the phenolic resin and aqueous polyurethane dispersion components are mixed in a solids weight ratio of 56 to 69 percent by weight phenolic resin to 44 to 31 percent by weight of polyurethane.
  • compositions of the various embodiments described herein may further contain any of a number of additives.
  • additives may be homogeneous or heterogeneous with one or more components in the composition.
  • Heterogenous additives may be discrete (e.g., particulate) or continuous in nature.
  • Aforementioned additives can include, for example, surfactants (e.g., antifoaming agents such as ethoxylated nonionic surfactants such as DYNOL 604), pigments (e.g., carbon black pigment such as C-SERIES BLACK 7 LCD4115), fillers (e.g.
  • surfactants e.g., antifoaming agents such as ethoxylated nonionic surfactants such as DYNOL 604
  • pigments e.g., carbon black pigment such as C-SERIES BLACK 7 LCD4115
  • fillers e.g.
  • silicon dioxide Cabosil M5 silicon dioxide Cabosil M5
  • synthetic waxes e.g., synthetic paraffin MP22
  • stabilizers e.g., plasticizers, tackifiers, flow control agents, cure rate retarders, adhesion promoters (for example, silanes such as (3 -glycidoxypropyl)trimethoxy silane (GPTMS), and titanates), adjuvants, impact modifiers, expandable microspheres, thermally conductive particles, electrically conductive particles, and the like, such as silica, glass, clay, talc, colorants, glass beads or bubbles, and antioxidants, so as to, e.g., reduce the weight and/or cost of the structural layer composition, adjust viscosity, and/or provide additional reinforcement or modify the thermal conductivity of compositions and articles used in the provided methods or so that a more rapid or uniform cure may be achieved.
  • adhesion promoters for example, silanes such as (3 -glycidoxypropyl)
  • the curable compositions can contain one or more fiber reinforcement materials.
  • a fiber reinforcement material can provide an abrasive layer having improved cold flow properties, limited stretchability, and enhanced strength.
  • the one or more fiber reinforcement materials can have a certain degree of porosity that enables a photoinitiator, when present, to be dispersed throughout, to be activated by UV light, and properly cured without the need for heat.
  • the one or more fiber reinforcements may comprise one or more fiber- containing webs including, but not limited to, woven fabrics, nonwoven fabrics, knitted fabrics, and a unidirectional array of fibers.
  • the one or more fiber reinforcements could comprise a nonwoven fabric, such as a scrim.
  • Materials for making the one or more fiber reinforcements may include any fiber-forming material capable of being formed into one of the above-described webs. Suitable fiber-forming materials include, but are not limited to, polymeric materials such as polyesters, polyolefins, and aramids; organic materials such as wood pulp and cotton; inorganic materials such as glass, carbon, and ceramic; coated fibers having a core component (e.g., any of the above fibers) and a coating thereon; and combinations thereof. [00100] Further options and advantages of the fiber reinforcement materials are described in U.S. Patent Publication No. 2002/0182955 (Weglewski et ah). [00101] In step 1240, abrasive particles are adhered. In some embodiments, abrasive particles are applied simultaneously with the application of make coat resin, such that the abrasive particles are embedded within the make coat.
  • abrasive particles may be utilized in the various embodiments described herein.
  • the particular type of abrasive particle e.g. size, shape, chemical composition
  • Suitable abrasive particles may be formed of, for example, cubic boron nitride, zirconia, alumina, silicon carbide and diamond.
  • the abrasive particles may be provided in a variety of sizes, shapes and profiles, including, for example, random or crushed shapes, regular (e.g. symmetric) profiles such as square, star-shaped or hexagonal profiles, and irregular (e.g. asymmetric) profiles.
  • the abrasive article may include a mixture of abrasive particles that are inclined on the backing (i.e. stand upright and extend outwardly from the backing) as well as abrasive particles that lie flat on their side (i.e. they do not stand upright and extend outwardly from the backing).
  • the abrasive article may include a mixture of different types of abrasive particles.
  • the abrasive article may include mixtures of platey and non-platey particles, crushed, agglomerated, and shaped particles (which may be discrete abrasive particles that do not contain a binder or agglomerate abrasive particles that contain a binder), conventional non-shaped and non-platey abrasive particles (e.g. filler material) and abrasive particles of different sizes.
  • Suitable shaped abrasive particles can be found in, for example, U.S. Patent Nos. 5,201,916 (Berg) and 8,142,531 (Adefris et al.)
  • a material from which the shaped abrasive particles may be formed comprises alpha alumina.
  • Alpha alumina shaped abrasive particles can be made from a dispersion of aluminum oxide monohydrate that is gelled, molded to shape, dried to retain the shape, calcined, and sintered according to techniques known in the art.
  • Suitable shaped abrasive particles can also be found in Published U.S. Appl. No. 2015/0267097, which is incorporated herein by reference. Published U.S. Appl. No. 2015/0267097 generally describes abrasive particles comprising alpha alumina having an average crystal grain size of 0.8 to 8 microns and an apparent density that is at least 92 percent of the true density. Each shaped abrasive particle can have a respective surface comprising a plurality of smooth sides that form at least four vertexes. [00108] U.S. Patent No.
  • shaped alpha alumina particles are precisely-shaped (i.e., the particles have shapes that are at least partially determined by the shapes of cavities in a production tool used to make them). Details concerning such shaped abrasive particles and methods for their preparation can be found, for example, in U.S. Patent Nos. 8,142,531 (Adefris et al.); 8,142,891 (Culler et al.); and 8,142,532 (Erickson et al.); and in U.S. Pat. Appl. Publ. Nos. 2012/0227333 (Adefris et al.); 2013/0040537 (Schwabel et al.); and 2013/0125477 (Adefris).
  • crushed abrasive particles include crushed abrasive particles comprising fused aluminum oxide, heat-treated aluminum oxide, white fused aluminum oxide, ceramic aluminum oxide materials such as those commercially available as 3M CERAMIC ABRASIVE GRAIN from 3M Company, St.
  • sol-gel-derived abrasive particles from which crushed abrasive particles can be isolated and methods for their preparation can be found in U. S. Patent Nos. 4,314,827 (Leitheiser et al.); 4,623,364 (Cottringer et al.); 4,744,802 (Schwabel), 4,770,671 (Monroe et al.); and 4,881,951 (Monroe et al.). It is also contemplated that the crushed abrasive particles could comprise abrasive agglomerates such as, for example, those described in U.S. Patent Nos.
  • the crushed abrasive particles comprise ceramic crushed abrasive particles such as, for example, sol-gel-derived polycrystalline alpha alumina particles. Ceramic crushed abrasive particles composed of crystallites of alpha alumina, magnesium alumina spinel, and a rare earth hexagonal aluminate may be prepared using sol-gel precursor alpha alumina particles according to methods described in, for example, U.S. PatentNo. 5,213,591 (Celikkaya et al.) and U.S. Publ. Pat. Appln. Nos. 2009/0165394 A1 (Culler et al.) and 2009/0169816 Al (Erickson et al.).
  • the abrasive particles may be surface-treated with a coupling agent (e.g., an organosilane coupling agent) or other physical treatment (e.g., iron oxide or titanium oxide) to enhance adhesion of the crushed abrasive particles to the binder.
  • a coupling agent e.g., an organosilane coupling agent
  • other physical treatment e.g., iron oxide or titanium oxide
  • the abrasive layer in some embodiments, includes a particulate mixture comprising a plurality of formed abrasive particles (e.g., precision shaped grain (PSG) mineral particles available from 3M, St. Paul, MN, which are described in greater detail herein; not shown in FIGS. 1-3) and a plurality of abrasive particles 250, or only formed abrasive particles, adhesively secured to the abrasive layer.
  • a plurality of formed abrasive particles e.g., precision shaped grain (PSG) mineral particles available from 3M, St. Paul, MN, which are described in greater detail herein; not shown in FIGS. 1-3
  • PSG precision shaped grain
  • the abrasive particles may be formed abrasive particles.
  • the term “formed abrasive particles” generally refers to abrasive particles (e.g., formed ceramic abrasive particles) having at least a partially replicated shape.
  • Non-limiting examples of formed abrasive particles are disclosed in Published U.S. Patent Appl. No. 2013/0344786, which is incorporated by reference as if fully set forth herein.
  • Non-limiting examples of formed abrasive particles include shaped abrasive particles formed in a mold, such as triangular plates as disclosed in U.S. Pat. Nos.
  • Formed abrasive particles also include shaped abrasive particles.
  • shaped abrasive particle generally refers to abrasive particles with at least a portion of the abrasive particles having a predetermined shape that is replicated from a mold cavity used to form the shaped precursor abrasive particle. Except in the case of abrasive shards (e.g. as described in U.S. patent publication US 2009/0169816), the shaped abrasive particle will generally have a predetermined geometric shape that substantially replicates the mold cavity that was used to form the shaped abrasive particle. Shaped abrasive particle as used herein excludes randomly sized abrasive particles obtained by a mechanical crushing operation.
  • Formed abrasive particles also include precision-shaped grain (PSG) mineral particles, such as those described in Published U.S. Appl. No. 2015/267097, which is incorporated by reference as if fully set forth herein.
  • PSG precision-shaped grain
  • Suitable abrasive particles include, for example, fused aluminum oxide, heat treated aluminum oxide, white fused aluminum oxide, black silicon carbide, green silicon carbide, titanium diboride, boron carbide, silicon nitride, tungsten carbide, titanium carbide, diamond, cubic boron nitride, hexagonal boron nitride, garnet, fused alumina zirconia, alumina-based sol gel derived abrasive particles, silica, iron oxide, chromia, ceria, zirconia, titania, tin oxide, gamma alumina, and mixtures thereof.
  • the alumina abrasive particles may contain a metal oxide modifier.
  • the diamond and cubic boron nitride abrasive particles may be monocrystalline or polycrystalline.
  • the formed abrasive particles have a substantially monodisperse particle size of from about 1 micrometers to about 5000 micrometers, from about 1 micrometers to about 2500, from about 1 micrometers to about 1000, from about 10 micrometers to about 5000, from about 10 micrometers to about 2500, from about 10 micrometers to about 1000, from about 50 micrometers to about 5000, from about 50 micrometers to about 2500, from about 50 micrometers to about 1000.
  • substantially monodisperse particle size is used to describe formed abrasive particles having a size that does not vary substantially.
  • formed abrasive particles e.g., a PSG mineral particles
  • greater than 90%, greater than 95% or greater than 99% of the formed abrasive particles will have a particle having its largest dimension be 100 micrometers.
  • the abrasive particles can have a range or distribution of particle sizes. Such a distribution can be characterized by its median particle size.
  • the median particle size of the abrasive particles may be at least 0.001 micrometers, at least 0.005 micrometers, at least 0.01 micrometers, at least 0.015 micrometers, or at least 0.02 micrometers.
  • the median particle size of the abrasive particles may be up to 300 micrometers, up to 275 micrometers, up to 250 micrometers, up to 150 micrometers, or up to 100 micrometers.
  • the median particle size of the abrasive particles is from about 1 micrometers to about 600 micrometers, from about 1 micrometers to about 300 micrometers, from about 1 micrometers to about 150 micrometers, from about 10 micrometers to about 600 micrometers, from about 10 micrometers to about 300 micrometers, from about 10 micrometers to about 150 micrometers, from about 50 micrometers to about 600 micrometers, from about 50 micrometers to about 300 micrometers, from about 50 micrometers to about 150 micrometers.
  • the abrasive particle of the present disclosure may include formed abrasive particles.
  • the formed abrasive particles may be present from 0.01 wt. percent to 100 wt, percent, from 0.1 wt. percent to 100 wt, percent, from 1 wt. percent to 100 wt, from 10 wt. percent to 100 wt, percent, from 0.01 wt. percent to 90 wt, percent, from 0.1 wt. percent to 90 wt, percent, from 1 wt. percent to 90 wt, from 10 wt. percent to 90 wt, percent, from 0.01 wt. percent to 75 wt, percent, from 0.1 wt. percent to 75 wt, percent, from 1 wt. percent to 75 wt, from 10 wt. percent to 75 wt, percent, based on the total weight of the abrasive particles.
  • the particulate mixture comprises from about greater than 90 wt.% to about 99 wt.% abrasive particles (e.g., from about 91 wt.% to about 97 wt.%; about 92 wt.% to about 97 wt.%; about 95 wt.% to about 97 wt.%; or greater than about 90 wt.% to about 97 wt.%).
  • abrasive particles e.g., from about 91 wt.% to about 97 wt.%; about 92 wt.% to about 97 wt.%; about 95 wt.% to about 97 wt.%; or greater than about 90 wt.% to about 97 wt.%.
  • Abrasive particles are at least partially embedded (for example, by electrostatic coating) in the make layer precursor, in some embodiments, comprising the phenolic resin, and the make layer precursor is at least partially polymerized.
  • step 1250 additional coats are applied, such as a size or supersize coat.
  • additional coats may provide additional functionality, such as lubrication or grinding aid.
  • the size layer is prepared by coating at least a portion of the make layer and abrasive particles with a size layer precursor comprising a second resin (which may be the same as, or different from, the make layer precursor), and at least partially curing the size layer precursor.
  • the make and size layers may comprise any binder resin that is suitable for use in abrading applications.
  • the make layer precursor may be partially polymerized prior to coating with abrasive particles and further polymerized at a later point in the manufacturing process.
  • a supersize layer may be applied to at least a portion of the size layer.
  • articles, processes, and methods of the present disclosure include a polyester film backing.
  • Useful polyester films may be manufactured from various types of thermoplastic polyester resins, including polyethylene terephthalate, polytetramethylene terephthalate, polyethylene-2, 6-naphthalate, and poly- 1, 4-cyclohexylene dimethyl terephthalate.
  • Polyester copolymers e.g., polyethylene terephthalate/isophthalate, polyethylene terephthalate/adipate, polyethylene terephthalate/sebacate, polyethylene terephthalate/sulfoisophthalate, and polyethylene terephthalate/azelate
  • polyethylene terephthalate/isophthalate e.g., polyethylene terephthalate/isophthalate, polyethylene terephthalate/adipate, polyethylene terephthalate/sebacate, polyethylene terephthalate/sulfoisophthalate, and polyethylene terephthalate/azelate
  • the abrasive article of the various embodiments described herein include a size coat 510. See FIG. 5.
  • the size coat comprises the cured product of a phenolic size composition.
  • the size coat comprises the cured (e.g., photopolymerized) product of a bis-epoxide (e.g., 3,4-epoxy cy cl ohexylmethyl-3, 4-epoxy cyclohexylcarboxylate, available from Daicel Chemical Industries, Ltd., Tokyo, Japan); a trifunctional acrylate (e.g., trimethylol propane triacrylate, available under the trade designation “SR351” from Sartomer USA, LLC, Exton, PA); an acidic polyester dispersing agent (e.g., “BYK W-985” from Byk-Chemie, GmbH, Wesel, Germany); a filler (e.g., a sodium-potassium alumina silicate filler,
  • a bis-epoxide e
  • the abrasive article of the various embodiments described include a supersize coat 610. See FIG. 6.
  • the supersize coat is the outermost coating of the abrasive article and directly contacts the workpiece during an abrading operation.
  • the supersize coat is, in some examples, substantially transparent.
  • substantially transparent refers to a majority of, or mostly, as in at least about 30%, 40%, 50%, 60%, or at least about 70% or more transparent.
  • the measure of the transparency of any given coat described herein is the coat’s transmittance.
  • the supersize coat displays a transmittance of at least 5 percent, at least 20 percent, at least 40 percent, at least 50 percent, or at least 60 percent (e.g., a transmittance from about 40 percent to about 80 percent; about 50 percent to about 70 percent; about 40 percent to about 70 percent; or about 50 percent to about 70 percent), according to a Transmittance Test that measures the transmittance of 500 nm light through a sample of 6 by 12 inch by approximately 1-2 mil (15.24 by 30.48 cm by 25.4 - 50.8 pm) clear polyester film, having a transmittance of about 98%.
  • a Transmittance Test that measures the transmittance of 500 nm light through a sample of 6 by 12 inch by approximately 1-2 mil (15.24 by 30.48 cm by 25.4 - 50.8 pm) clear polyester film, having a transmittance of about 98%.
  • One component of supersize coats can be a metal salt of a long-chain fatty acid (e.g., a C12-C22 fatty acid, a C14-C18 fatty acid, and a C16-C20 fatty acid).
  • the metal salt of a long-chain fatty acid is a stearate salt (e.g., a salt of stearic acid).
  • the conjugate base of stearic acid is C17H35COO-, also known as the stearate anion.
  • Useful stearates include, but are not limited to, calcium stearate, zinc stearate, and combinations thereof.
  • the metal salt of a long-chain fatty acid can be present in an amount of at least 10 percent, at least 50 percent, at least 70 percent, at least 80 percent, or at least 90 percent by weight based on the normalized weight of the supersize coat (i.e., the average weight for a unit surface area of the abrasive article).
  • the metal salt of a long-chain fatty acid can be present in an amount of up to 100 percent, up to 99 percent, up to 98 percent, up to 97 percent, up to 95 percent, up to 90 percent, up to 80 percent, or up to 60 percent by weight (e.g., from about 10 wt.% to about 100 wt.%; about 30 wt.% to about 70 wt.%; about 50 wt.% to about 90 wt.%; or about 50 wt.% to about 100 wt.%) based on the normalized weight of the supersize coat.
  • the supersize coat is a polymeric binder, which, in some examples, enables the supersize coat to form a smooth and continuous film over the abrasive layer.
  • the polymeric binder is a styrene-acrylic polymer binder.
  • the styrene-acrylic polymer binder is the ammonium salt of a modified styrene-acrylic polymer, such as, but not limited to, JONCRYL® LMV 7051.
  • the ammonium salt of a styrene-acrylic polymer can have, for example, a weight average molecular weight (Mw) of at least 100,000 g/mol, at least 150,000 g/mol, at least 200,000 g/mol, or at least 250,000 g/mol (e.g., from about 100,000 g/mol to about 2.5 x 106 g/mol; about 100,000 g/mol to about 500,000 g/mol; or about 250,000 to about 2.5 x 106 g/mol).
  • Mw weight average molecular weight
  • the supersize coat may also have a grinding aid is defined as particulate material, the addition of which to an abrasive article has a significant effect on the chemical and physical processes of abrading. In particular, it is believed that the grinding aid may:
  • grinding aids are described herein as used in the supersize layer, they may also be applied as part of the laminate layer.
  • Exemplary grinding aids may include inorganic halide salts, halogenated compounds and polymers, and organic and inorganic sulfur-containing materials.
  • Exemplary grinding aids which may be organic or inorganic, include waxes, halogenated organic compounds such as chlorinated waxes like tetrachloronaphthalene, pentachloronaphthalene, and polyvinyl chloride; halide salts such as sodium chloride, potassium cryolite, sodium cryolite, ammonium cryolite, potassium tetrafluorob orate, sodium tetrafluoroborate, silicon fluorides, potassium chloride, magnesium chloride; and metals and their alloys such as tin, lead, bismuth, cobalt, antimony, cadmium, iron, and titanium.
  • Examples of other grinding aids include sulfur, organic sulfur compounds, graphite, and metallic sulfides, organic and inorganic phosphate-containing materials. A combination of different grinding aids may be used.
  • Preferred grinding aids include halide salts, particularly potassium tetrafluoroborate (KBF4), cryolite (Na3AlF6), and ammonium cryolite [(NH4)3 A1F6]
  • halide salts that can be used as grinding aids include sodium chloride, potassium cryolite, sodium tetrafluoroborate, silicon fluorides, potassium chloride, and magnesium chloride.
  • Other preferred grinding aids are those in U.S. Pat. No. 5,269,821 (Helmin et ah), which describes grinding aid agglomerates comprised of water soluble and water insoluble grinding aid particles.
  • Suitable grinding aid agglomerates are those wherein a plurality of grinding aid particles are bound together into an agglomerate with a binder. Agglomerates of this type are described in U.S. Pat. No. 5,498,268 (Gagliardi et al.).
  • halogenated polymers useful as grinding aids include polyvinyl halides (e.g., polyvinyl chloride) and polyvinylidene halides such as those disclosed in U.S. Pat. No. 3,616,580 (Dewell et al.); highly chlorinated paraffin waxes such as those disclosed in U.S. Pat. No. 3,676,092 (Buell); completely chlorinated hydrocarbons resins such as those disclosed in U.S. Pat. No. 3,784,365 (Caserta et al.); and fluorocarbons such as polytetrafluoroethylene and polytrifluorochloroethylene as disclosed in U.S. Pat. No. 3,869,834 (Mullin et al.).
  • polyvinyl halides e.g., polyvinyl chloride
  • polyvinylidene halides such as those disclosed in U.S. Pat. No. 3,616,580 (Dewell et al.); highly chlorin
  • Inorganic sulfur-containing materials useful as grinding aids include elemental sulfur, iron(II) sulfide, cupric sulfide, molybdenum sulfide, potassium sulfate, and the like, as variously disclosed in U.S. Pat. Nos. 3,833,346 (Wirth), 3,868,232 (Sioui et al.), and 4,475,926 (Hickory).
  • Organic sulfur-containing materials e.g., thiourea
  • for use in the invention include those mentioned in U.S. Pat. No. 3,058,819 (Paulson).
  • the supersize layer may also comprise other components and/or additives, such as abrasive particles, fillers, diluents, fibers, lubricants, wetting agents, surfactants, pigments, dyes, coupling agents, resin curatives, plasticizers, antistatic agents, and suspending agents.
  • additives such as abrasive particles, fillers, diluents, fibers, lubricants, wetting agents, surfactants, pigments, dyes, coupling agents, resin curatives, plasticizers, antistatic agents, and suspending agents.
  • fillers suitable for this invention include wood pulp, vermiculite, and combinations thereof, metal carbonates, such as calcium carbonate, e.g., chalk, calcite, marl, travertine, marble, and limestone, calcium magnesium carbonate, sodium carbonate, magnesium carbonate; silica, such as amorphous silica, quartz, glass beads, glass bubbles, and glass fibers; silicates, such as talc, clays (montmorillonite), feldspar, mica, calcium silicate, calcium metasilicate, sodium aluminosilicate, sodium silicate; metal sulfates, such as calcium sulfate, barium sulfate, sodium sulfate, aluminum sodium sulfate, aluminum sulfate; gypsum; vermiculite; wood flour; aluminum trihydrate; metal oxides, such as calcium oxide (lime), aluminum oxide, titanium dioxide, and metal sulfites, such as calcium sulfite.
  • metal carbonates such as calcium carbonate,
  • the minimum film-forming temperature is the lowest temperature at which a polymer self-coalesces in a semi-dry state to form a continuous polymer film.
  • this polymer film can then function as a binder for the remaining solids present in the supersize coat.
  • the styrene-acrylic polymer binder e.g., the ammonium salt of a styrene-acrylic polymer
  • the binder is dried at relatively low temperatures (e.g., at 70°C or less).
  • the drying temperatures are, in some examples, below the melting temperature of the metal salt of a long-chain fatty acid component of the supersize coat.
  • Use of excessively high temperatures (e.g., temperatures above 80°C) to dry the supersize coat is undesirable because it can induce brittleness and cracking in the backing, complicate web handling, and increase manufacturing costs.
  • a binder comprised of, e.g., the ammonium salt of a styrene-acrylic polymer allows the supersize coat to achieve better film formation at lower binder levels and at lower temperatures without need for added surfactants such as DOWANOL® DPnP.
  • the polymeric binder can be present in an amount of at least 0.1 percent, at least 1 percent, or at least 3 percent by weight, based on the normalized weight of the supersize coat.
  • the polymeric binder can be present in an amount of up to 20 percent, up to 12 percent, up to 10 percent, or up to 8 percent by weight, based on the normalized weight of the supersize coat.
  • the ammonium salt of a modified styrene acrylic copolymer is used as a binder, the haziness normally associated with a stearate coating is substantially reduced.
  • the supersize coats of the present disclosure optionally contain clay particles dispersed in the supersize coat.
  • the clay particles when present, can be uniformly mixed with the metal salt of a long chain fatty acid, polymeric binder, and other components of the supersize composition.
  • the clay can bestow unique advantageous properties to the abrasive article, such as improved optical clarity and improved cut performance.
  • the inclusion of clay particles can also enable cut performance to be sustained for longer periods of time relative to supersize coats in which the clay additive is absent.
  • the clay particles when present, can be present in an amount of at least 0.01 percent, at least 0.05 percent, at least 0.1 percent, at least 0.15 percent, or at least 0.2 percent by weight based on the normalized weight of the supersize coat. Further, the clay particles can be present in an amount of up to 99 percent, up to 50 percent, up to 25 percent, up to 10 percent, or up to 5 percent by weight based on the normalized weight of the supersize coat. [00144] The clay particles may include particles of any known clay material.
  • Such clay materials include those in the geological classes of the smectites, kaolins, illites, chlorites, serpentines, attapulgites, palygorskites, vermiculites, glauconites, sepiolites, and mixed layer clays.
  • Smectites in particular include montmorillonite (e.g., a sodium montmorillonite or calcium montmorillonite), bentonite, pyrophyllite, hectorite, saponite, sauconite, nontronite, talc, beidellite, and volchonskoite.
  • kaolins include kaolinite, dickite, nacrite, antigorite, anauxite, halloysite, indellite and chrysotile.
  • Illites include bravaisite, muscovite, paragonite, phlogopite and biotite.
  • Chlorites can include, for example, corrensite, penninite, donbassite, sudoite, pennine and clinochlore.
  • Mixed layer clays can include allevardite and vermiculitebiotite. Variants and isomorphic substitutions of these layered clays may also be used.
  • nanoparticles i.e., nanoscale particles
  • Useful nanoparticles include, for example, nanoparticles of metal oxides, such as zirconia, titania, silica, ceria, alumina, iron oxide, vanadia, zinc oxide, antimony oxide, tin oxide, and alumina-silica.
  • the nanoparticles can have a median particle size of at least 1 nanometer, at least 1.5 nanometers, or at least 2 nanometers.
  • the median particle size can be up to 200 nanometers, up to 150 nanometers, up to 100 nanometers, up to 50 nanometers, or up to 30 nanometers.
  • compositions include curing agents, surfactants, antifoaming agents, biocides, and other particulate additives known in the art for use in supersize compositions.
  • the supersize coat can be formed, in some examples, by providing a supersize composition in which the components are dissolved or otherwise dispersed in a common solvent.
  • the solvent is water.
  • the supersize dispersion can be coated onto the underlying layers of the abrasive article and dried to provide the finished supersize coat.
  • the supersize composition can be cured (e.g., hardened) either thermally or by exposure to actinic radiation at suitable wavelengths to activate the curing agent.
  • the coating of the supersize composition onto, e.g., the abrasive layer can be carried out using any known process.
  • the supersize composition is applied by spray coating at a constant pressure to achieve a pre-determined coating weight.
  • a knife coating method where the coating thickness is controlled by the gap height of the knife coater can be used.
  • Abrasive articles according to the present disclosure may be converted, for example, into a belt, roll (e.g., tape roll), disc (e.g., perforated disc), or sheet. They may be used by hand or in combination with a machine such as a belt grinder. For belt applications, the two free ends of an abrasive sheet are joined together and spliced, thus forming an endless belt.
  • the term “substantially” as used herein refers to a majority of, or mostly, as in at least about 50%, 60%, 70%, 80%, 90%, 95%, 96%, 97%, 98%, 99%, 99.5%, 99.9%, 99.99%, or at least about 99.999% or more.
  • substantially no refers to a minority of, or mostly no, as in less than about 10%, 5%, 2%, 1%, 0.5%, 0.01%, 0.001%, or less than about 0.0001% or less.
  • An abrasive article includes a backing substrate and a laminate joined to the backing substrate.
  • the laminate comprises a hot melt polymer.
  • the article includes a cured resin composition joined to the laminate opposite the backing substrate.
  • the article also includes abrasive particles joined to the cured resin composition.
  • the abrasive article may be implemented such that the laminate at least partially wraps around the strands to leave open the first and second void spaces.
  • the abrasive article may be implemented such that the laminate is joined to the backing substrate as a continuous sheet, an extruded film or a coating layer.
  • the abrasive article may be implemented such that the laminate is extruded on to the backing substrate.
  • the abrasive article may be implemented such that the substrate is treated with a primer treatment before or after the lamination.
  • the abrasive article may be implemented such that the primer treatment is one of: a backsize layer, a presize layer, a tie layer, a saturant, a subsize treatment, a plasma treatment, a corona treatment, ultraviolet light exposure, electron beam exposure, a flame discharge, or a combination thereof.
  • the abrasive article may be implemented such that the fabric substrate has a first stiffness and a second stiffness after the laminate is joined to the fabric stiffness, and wherein the second stiffness is equal to or higher than the first stiffness.
  • the abrasive article may be implemented such that the backing comprises a woven material.
  • the abrasive article may be implemented such that the backing comprises a non woven material.
  • the abrasive article may be implemented such that the backing comprises a perforated film.
  • the abrasive article may be implemented such that the backing substrate comprises a fabric comprising strands that form first void spaces between the strands, and wherein a plurality of second void spaces extend through the laminate and coincide with first void spaces in the fabric substrate.
  • the abrasive article may be implemented such that the second void spaces are formed when the cured resin is joined to the laminate.
  • the abrasive article may be implemented such that the hot melt polymer includes polyester.
  • the abrasive article may be implemented such that the hot melt polymer includes polyamide, polyester, polyethylene acrylic acid] copolymer, poly(ethylene- acrylate) copolymer, poly-(ethyl methyl acetate) copolymer, polyolefins, polyurethanes polyethyl vinyl acetate, polyethylene acrylate copolymer, ethylene methacrylic acid copolymer, acid-modified ethylene terpolymers, anhydride-modified ethylene acylate, vinyl acetate polymer or a blend thereof.
  • the hot melt polymer includes polyamide, polyester, polyethylene acrylic acid] copolymer, poly(ethylene- acrylate) copolymer, poly-(ethyl methyl acetate) copolymer, polyolefins, polyurethanes polyethyl vinyl acetate, polyethylene acrylate copolymer, ethylene methacrylic acid copolymer, acid-modified ethylene terpolymers,
  • the abrasive article may be implemented such that the laminate comprises a material with a melting point between about 30°C to about 220°C.
  • the abrasive article may be implemented such that the laminate comprises a material with a melting point between about 75°C to about 115°C.
  • the abrasive article may be implemented such that the laminate comprises a material with a melting temperature lower than the melting point or the degradation temperature of the resin coated above, but high enough that the laminate will not melt or wash away during resin cure and abrasive use .
  • the abrasive article may be implemented such that the backing substrate has a first surface roughness, and a second surface roughness after the laminate is joined to the backing substrate, and wherein the second surface roughness is less than the first surface roughness.
  • the abrasive article may be implemented such that the laminate joined to the backing substrate has a surface roughness value less than about 20 pm.
  • the abrasive article may be implemented such that the laminate joined to the backing substrate has a surface roughness value less than about 10 pm.
  • the abrasive article may be implemented such that the laminate has a coating weight between about 10 and about 200 gsm.
  • the abrasive article may be implemented such the laminate has a coating weight between about 15 and about 40 gsm. [00178] The abrasive article may be implemented such that the laminate has a coating weight between about 25 and about 35 gsm.
  • the abrasive article may be implemented such that the laminate substantially prevents bleed-through of the resin to the backing substrate, such that the resin does not directly contact the backing substrate.
  • the abrasive article may be implemented such that the abrasive particles comprise crushed abrasive particles, formed abrasive particles, platey abrasive particles, shaped abrasive particles, or a mixture thereof.
  • the abrasive article may be implemented such that the abrasive particles comprise particles of similar size.
  • the abrasive article may be implemented such that it also includes a size coat applied over the abrasive particles.
  • the abrasive article may be implemented such that it also includes a supersize coat.
  • the abrasive article may be implemented such that the laminate has antiloading functionality.
  • the abrasive article may be implemented such that has antistatic functionality.
  • the abrasive article may be implemented such that the laminate has adhesive promotion functionality with respect to the backing and a resin composition.
  • the abrasive article may be implemented such that the laminate is configured to bond to a backing substrate material and a resin composition.
  • the abrasive article may be implemented such that the resin composition comprises a novolac phenolic or a resole-based resin, epoxy-based resin, UF-make reference.
  • a method of manufacturing a coated abrasive article includes providing a backing substrate.
  • the method also includes applying a thermoplastic laminate.
  • the method also includes applying a make resin.
  • the method also includes applying a plurality of abrasive particles.
  • the method may also include applying a size layer.
  • the method may also be implemented such that the backing substrate undergoes a primer treatment, wherein the primer treatment is one of: a backsize layer, a presize layer, a tie layer, a saturant, a subsize treatment, a plasma treatment, a corona treatment, ultraviolet light exposure, electron beam exposure, or a flame discharge.
  • a primer treatment is one of: a backsize layer, a presize layer, a tie layer, a saturant, a subsize treatment, a plasma treatment, a corona treatment, ultraviolet light exposure, electron beam exposure, or a flame discharge.
  • the method may also include applying the thermoplastic laminate comprises applying the laminate as a continuous sheet, a blown melty film, or an extrusion.
  • the method may also be implemented such that the laminate is coextruded with the backing substrate.
  • the method may also be implemented such that the backing substrate comprises: a woven substrate, a nonwoven substrate, a mesh substrate, a fabric substrate, a continuous material, or a perforated film.
  • the method may also include applying a thermoplastic laminate comprises applying a coating weight of the laminate between about 10 gsm and about 60 gsm.
  • the method may also include applying a thermoplastic laminate comprises applying a coating weight of the laminate between about 15 gsm and about 40 gsm.
  • the method may also include applying a thermoplastic laminate comprises applying a coating weight of the laminate between about 15 gsm and about 25 gsm.
  • the method may also be implemented such that after the laminate is applied the backing substrate has a roughness of less than about 20 pm.
  • the method may also be implemented such that after the laminate is applied the backing substrate has a roughness of less than about 20 pm.
  • the method may also be implemented such that the laminate has a coating thickness between about 10 pm and about 50 pm.
  • the method may also be implemented such that the laminate has a coating thickness between about 10 pm and about 20 pm.
  • the method may also be implemented such that the resin is a phenolic-based or resole-based resin.
  • the method may also be implemented such that the hot melt polymer includes polyester.
  • the hot melt polymer includes polyamide, ethylene and acrylic acid (EAA) copolymer, ethyl methyl acetate or ethyl vinyl acetate.
  • EAA acrylic acid
  • the method may also be implemented such that the laminate comprises a material with a melting point between about 50°C to about 150°C.
  • the method may also be implemented such that the laminate comprises a material with a melting point between about 80°C to about 110°C.
  • the method may also be implemented such that the backing substrate comprises a fabric comprising strands that form first void spaces between the strands, and wherein a plurality of second void spaces extend through the laminate and coincide with first void spaces in the fabric substrate.
  • the method may also be implemented such that the second void spaces are formed when the resin is applied to the laminate.
  • the method may also be implemented such that the cured resin substantially only contacts the laminate, such that the resin is substantially not in contact with the backing substrate.
  • the method may also be implemented such that the laminate has antiloading functionality.
  • the method may also be implemented such that the laminate has antistatic functionality.
  • the method may also be implemented such that the laminate has adhesive promotion functionality with respect to the backing and a resin composition.
  • a Steamfast SF-680 Digital Steam Press was used for sample lamination.
  • the equipment was preset at the “silk” mode with the top plate temperature at 130 C - 140 C, measured by an IR thermometer.
  • a 120 gsm (gram per square meter) mesh web with loops knit on one face (Sitip, Itay) was cut into 23 cm x 28 cm sheet, and put on the bottom plate of the steam press with the loop-face down.
  • a pre-extruded 30 gsm film consisting of 80% of copolyester (HM4185, Bostik, MA) and 20% of poly(ethylene acrylic acid) (PRIMACOR 3330, Dow Chemical) was cut into the same size, and aligned on the top of the mesh.
  • a paper release liner with slightly larger size was put on the top to cover the film and mesh with the releasing face down.
  • the top plate of the steam press was pushed down to close the gap until the web reached the preset temperature.
  • the release liner was removed from the top surface after the whole web was cool down to ambient temperature to obtain a film laminated backing sample.
  • FIG. 17A illustrates the fabric backing before lamination
  • FIG. 17B illustrates the fabric backing after lamination.
  • the surface roughness was measured at 8.21 pm using the method described below, and illustrated in FIGS. 18A and 18B.
  • Example 2
  • the steam press was preset at the “silk” mode with the top plate temperature at 130 C - 140 C, measured by an IR thermometer.
  • a 170 gsm plain-woven cotton cloth (Milliken, SC) was cut into 23 cm x 28 cm sheet, and put on the bottom plate of the steam press with the loop-face down.
  • a paper release liner with slightly larger size was put on the top to cover the film and mesh with the releasing face down.
  • FIG. 17C illustrates the fabric backing before lamination
  • FIG. 17D illustrates the fabric backing after lamination.
  • the surface roughness of the laminated sample and pristine cloth were measured at 7.08 pm and 27.98 pm respectively, as illustrated in FIGS. 18A and 18B, using the method described below.
  • the steam press was preset at the “silk” mode with the top plate temperature at 130 C - 140 C, measured by an IR thermometer.
  • a 330 gsm satin-woven polyester cloth (Milliken, SC) was cut into 23 cm x 28 cm sheet, and put on the bottom plate of the steam press with the loop-face down.
  • a paper release liner with slightly larger size was put on the top to cover the film and mesh with the releasing face down.
  • FIG. 17E illustrates the fabric backing before lamination
  • FIG. 17F illustrates the fabric backing after lamination.
  • the surface roughness of the laminated sample and pristine cloth were measured at 6.93 pm and 23.85 pm respectively, as illustrated in FIGS. 18A and 18B, using the method described below.
  • a Keyence VKX1100 confocal 3D measuring microscope is used to scan the surface.
  • the microscope has a 2.5x lens and stitched 2x2, resulting in about an ⁇ 85mm 2 area.
  • Keyence VK Series Analyzer Software was used to acquire Sa and Sdr surface roughness/texture parameters as defined by ISO-21578, where Sa refers to the Arithmetical mean height of the surface, and Sdr refers to the Developed interfacial rea ratio.

Abstract

L'invention concerne un article abrasif. L'article abrasif a un substrat de support. L'article abrasif comprend également un stratifié relié au substrat de support. Le stratifié comprend un polymère thermofusible. L'article abrasif a également une composition de résine durcie reliée au stratifié à l'opposé du substrat de support. L'article abrasif comprend également des particules abrasives liées à la composition de résine durcie.
PCT/IB2020/061600 2019-12-09 2020-12-07 Article abrasif WO2021116882A1 (fr)

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CN202080085693.2A CN114829069A (zh) 2019-12-09 2020-12-07 磨料制品
US17/756,911 US20230001541A1 (en) 2019-12-09 2020-12-07 Abrasive article

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US62/945,244 2019-12-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023037272A1 (fr) 2021-09-08 2023-03-16 3M Innovative Properties Company Article abrasif à combinaison calandrée
WO2023225356A1 (fr) 2022-05-20 2023-11-23 3M Innovative Properties Company Ensemble abrasif à segments abrasifs
WO2024069579A1 (fr) * 2022-09-29 2024-04-04 3M Innovative Properties Company Article abrasif et procédé de formation d'article abrasif

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WO2023225356A1 (fr) 2022-05-20 2023-11-23 3M Innovative Properties Company Ensemble abrasif à segments abrasifs
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