US20160374531A1 - Uv treated scrubbing articles and methods of making same - Google Patents

Uv treated scrubbing articles and methods of making same Download PDF

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Publication number
US20160374531A1
US20160374531A1 US15/024,621 US201615024621A US2016374531A1 US 20160374531 A1 US20160374531 A1 US 20160374531A1 US 201615024621 A US201615024621 A US 201615024621A US 2016374531 A1 US2016374531 A1 US 2016374531A1
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United States
Prior art keywords
substrate
texture layer
scrubbing
article
scrubbing article
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Abandoned
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US15/024,621
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English (en)
Inventor
Paul N. Daveloose
Matthew S. Cole
Ibrahim S. Gunes
Sheng Ye
Stewart H. Corn
Deval Y. Vashistha
Shridhar B. Shinde
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3M Innovative Properties Co
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3M Innovative Properties Co
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Priority to US15/024,621 priority Critical patent/US20160374531A1/en
Assigned to 3M INNOVATIVE PROPERTIES COMPANY reassignment 3M INNOVATIVE PROPERTIES COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAVELOOSE, PAUL N., COLE, Matthew S., SHINDE, SHRIDHAR B., VASHISTHA, DEVAL Y., CORN, STEWART H., GUNES, Ibrahim S., YE, SHENG
Publication of US20160374531A1 publication Critical patent/US20160374531A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L1/00—Cleaning windows
    • A47L1/06—Hand implements
    • A47L1/15—Cloths, sponges, pads, or the like, e.g. containing cleaning agents
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
    • A47L13/16—Cloths; Pads; Sponges
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L13/00—Implements for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L13/10—Scrubbing; Scouring; Cleaning; Polishing
    • A47L13/16—Cloths; Pads; Sponges
    • A47L13/17—Cloths; Pads; Sponges containing cleaning agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/36—After-treatment
    • C08J9/365—Coating
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/001—Treatment with visible light, infrared or ultraviolet, X-rays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene

Definitions

  • the present disclosure relates to scrubbing articles having a UV cured textured surface. More particularly, the present disclosure relates to scrubbing articles formed by a thick, single layer substrate and a UV treated texture layer formed on at least one surface of the substrate to provide the scrubbing article with enhanced surface treating capabilities.
  • a variety of cleaning articles in the form of pads and wipes have been developed and made commercially available for household and industrial use. Consumers oftentimes desire to use the articles for cleaning or surface treating tasks requiring scrubbing which in turn may include various degrees of abrading and/or scouring. For example, it can be difficult, if not impossible, to remove dried food from a countertop using an inherently soft article. Furthermore, overly flexible or drapable articles may prove unwieldy when used to scour a surface as there is no substantive handle for comfortable holding of the article when scrubbing or scouring a surface.
  • manufacture of cleaning articles oftentimes involves forming a texture or abrasive layer on a surface of one substrate and subsequently bonding or laminating the textured substrate to a secondary substrate or material, for example to provide the desired handle thickness described above. Requiring additional substrates involves added time and cost in the manufacturing process. It is therefore desirable to provide a single substrate material that has the desired handling properties noted above such that an abrasive surface may be formed directly onto the thick substrate.
  • the nonwoven scrubbing wipe article of Johnson et al. can be used “dry” or can be loaded with a chemical solution.
  • U.S. Patent App. Pub. No 2006/0286884 to Thioliere et al. describes a wiping article comprising a liquid-absorbent web material and abrasive areas comprising cured binder material disposed on a surface of the web.
  • the web material may include woven, knitted and non-woven materials.
  • Non-woven materials may include dry-laid, wet-laid and spun-bonded materials.
  • Suitable binder materials are disclosed that can be cured by heating, cooling or ultraviolet light.
  • U.S. Patent App. Pub. No. 2007/0212965 to Smith et al. describes a flexible scrubbing material that combines at least two discrete components, one being a continuous flexible substrate and one a discontinuous abrasive layer affixed to the flexible substrate.
  • the abrasive layer is a set of plates formed from a material different than the continuous flexible substrate.
  • the plate material is a printable material that subsequently solidifies, such as epoxy.
  • Smith et al. teach that the abrasive plates can be formed from a solidified material such as ultraviolet or thermally curable polymeric materials with or without abrasive particles embedded inside. Smith et al.
  • Crosslinking of the materials (i.e., abrasives) formed on the substrate can significantly improve a variety of properties of the deposited or formed abrasives, including the durability, hardness, tensile and impact strength, high-heat properties, solvent and chemical resistance, abrasion resistance, and environmental stress crack resistance.
  • UV treatment can be used to effect sterilization, polymerization and crosslinking of materials. UV treatment is a rapid, clean and relatively cost-effective method for crosslinking and/or polymerizing materials and offers many advantages over traditional drying methods such as increased production speed, reduced reject rates and improved properties of the treated materials.
  • a scrubbing article having a thickness that allows for comfortable handling by a user is desired.
  • improvements in the properties of the scrubbing surface (e.g., texture layer) of a scrubbing article may be beneficial and therefore desirable.
  • improvements to the manufacturing processes of scrubbing articles can be advantageous. A need therefore exists for a scrubbing article that includes the benefits and advantages of a thick, single layer substrate having a UV treated textured surface for scrubbing.
  • a scrubbing article including a substrate made of a single-layer foam or sponge material and a UV crosslinked texture layer formed on a surface of the substrate.
  • Substrates of the present disclosure may be formed to have a thickness that allows for ease of handling during a scrubbing or cleaning function.
  • the substrate can have a thickness of between 1 and 5 cm and may particularly have a thickness of 3 cm.
  • a second texture layer can be formed on any other surface of the substrate.
  • the texture layer defines a pattern.
  • the texture layer includes a plurality of randomly distributed texturings.
  • the texture layer has a hardness at least equal to and in embodiments, greater than the hardness of the substrate.
  • the texture composition includes a resin and at least one photoinitiator and can include additional minerals, fillers, colorants, thickeners, defoaming agents, surfactants or other constituents.
  • a chemical can be absorbed into the substrate, formed on the substrate surface, and/or provided as part of the texture layer composition.
  • Methods of manufacturing a scrubbing article according to the disclosure include forming a UV treatable composition onto a surface of a substrate to form a UV crosslinkable texture layer and UV crosslinking the UV crosslinkable texture layer by exposing the layer to UV radiation to form a UV crosslinked texture layer.
  • the UV treatable composition is a UV crosslinkable composition.
  • the UV treatable composition is a UV polymerizable composition.
  • FIG. 1 is a perspective view of an exemplary scrubbing article in accordance with the present disclosure
  • FIG. 1A is an enlarged plan view of a portion of the surface of the scrubbing article of FIG. 1 ;
  • FIG. 2 is an enlarged, cross-sectional view of a portion of the article of FIG. 1 along the lines 2 - 2 shown in FIG. 1 ;
  • FIG. 3 is an enlarged, cross-sectional view of the article portion of FIG. 2 being applied to a surface;
  • FIG. 4 is a simplified, schematic diagram of a method of manufacture in accordance with an embodiment of the present disclosure.
  • FIGS. 5A-5B are top views of alternative embodiments of a scrubbing article in accordance with the present disclosure.
  • the substrate 12 and the texture layer 14 can comprise a variety of different materials as described further below.
  • the texture layer 14 is characterized as including an abrasive composition that is formed on the substrate 12 and is exposed to UV light (UV treated) to form a UV treated (UV crosslinked and/or UV polymerized) texture layer 14 , as will be described more fully below.
  • UV treated UV treated
  • UV crosslinked and/or UV polymerized UV treated texture layer 14
  • the present disclosure encompasses texture layer 14 compositions that may include UV polymerized/polymerizable materials (e.g., monomers) or UV crosslinked/crosslinkable materials (e.g., multifunctional monomers, polymers), or may include both, whether or not indication is specifically made to these alternative texture layer composition possibilities.
  • the substrate 12 defines first and second opposing surfaces 16 , 18 .
  • the thickness of the substrate 12 (denoted by reference “t”) and of the texture layer 14 may be exaggerated or understated in FIGS. 2 and 4 .
  • the texture layer 14 is formed on one or more surfaces of the substrate (e.g., surface 16 ).
  • the texture layer 14 can also penetrate the surfaces 16 , 18 to some degree.
  • the texture layer 14 defines a plurality of discrete portions (e.g., the various dot-like portions shown in FIG. 1 and referenced generally at 20 a , 20 b ).
  • Discrete portions 20 a , 20 b may form a randomly textured surface or may form a pattern on the substrate surface 16 .
  • discrete portions e.g., 20 a , 20 b
  • discrete portions may extend or project outwardly from the surface 16 at substantially uniform distances or, alternatively, may extend or project outwardly from the surface 16 at varying distances (i.e. the discrete portions 20 a , 20 b can have similar or varying heights with respect to the surface 16 ). In some embodiments, discrete portions (e.g., 20 a , 20 b ) may extend to any distance in a range of about 10 to about 200 microns outwardly from the surface 16 .
  • a user during a scrubbing application, will normally hold the article 10 by grasping the article for example along a side or edge 15 .
  • the thickness “t” of article 10 allows for easy grasping or holding of the article 10 as described more fully below.
  • the user will then position the scrubbing article 10 such that the texture layer 14 is facing the surface to be scrubbed. An example of this orientation is provided in FIG. 3 whereby the scrubbing article 10 is positioned to clean or otherwise treat a surface 30 .
  • the surface 30 to be cleaned is application specific, and can be relatively hard (e.g., a table top or cooking pan) or relatively soft (e.g., human skin, polymeric baking vessels, etc.).
  • the surface 30 to be scrubbed may have a mass 32 that is undesirably affixed thereto.
  • the mass 32 will be unique to the particular scrubbing application, but includes matters such as dirt, dried food, dried blood, etc.
  • the scrubbing article 10 of the present disclosure facilitates scrubbing removal of the mass 32 as a user repeatedly forces the texture layer 14 (or a portion or section thereof) back and forth across the mass 32 .
  • Each section (for example, the portions 20 a , 20 b ) of the texture layer 14 must be sufficiently hard to either abrade or entirely remove the mass 32 during the scrubbing motion.
  • the texture layer 14 must extend an appreciable distance from the substrate surface 16 to ensure intimate surface interaction with the mass 32 along not only an outer most surface 40 , but along sides 42 as well.
  • Portions 20 a , 20 b while depicted as having uniform, sharp corners or edges (at the intersection of surface 40 and sides 42 ), may likewise or instead have rounded edges or corners or may be non-uniform in cross-section. What is important is that the extension of the texture layer is such that the desired scrubbiness is achieved.
  • many cleaning wipes incorporating a blown fiber “scrubbing” or texture layer provide only a minimal thickness or extension relative to the substrate surface, likely giving rise to a less than desirable scrubbiness characteristic.
  • the discrete portions for example, the portions 20 a , 20 b
  • the texture layer 14 be sufficiently spaced from one another to ensure intimate contact between the mass 32 and the sidewall 42 of the particular texture layer portion 20 a , 20 b during a cleaning operation.
  • the texture layer 14 has abrasion resistance such that the composition forming the texture layer 14 remains substantially intact on the substrate 12 during and after the article 10 is used to scrub a surface 30 .
  • both surfaces 16 , 18 have a texture layer 14 , then each side can be used in the manner described above. However, if one side is not textured, the non-textured side may be used for milder scrubbing or wiping functions. In this manner, the scrubbing article can be used as a multifunctional or multipurpose cleaning article.
  • the UV treated texture layer 14 of the present disclosure may be configured to have a relative hardness at least equal to or greater than the hardness of the substrate 12 to which the layer is imparted, as briefly referred to above. Stated otherwise, the local hardness of the texture layer portions (e.g., 20 a , 20 b ) or overall texture layer 14 is equal to or greater than the hardness of the entire article 10 , or the “global hardness”. Article 10 may thus be defined as having global flexibility, since the substrate 12 is softer or more flexible in relation to the harder, less flexible abrasive/texture layer 14 . Hardness of a texture composition 14 after having been formed on a substrate as well as hardness of a substrate (for comparison) can be achieved in a number of ways.
  • hardness of a material can be established by determining the Rockwell indentation hardness, such as described in ASTM E18-14a: Standard Test Methods for Rockwell Hardness of Metallic Materials; by determining Knoop and Vickers hardness, such as described in ASTM E384-10: Standard Test Method for Knoop and Vickers Hardness of Materials; by determining the durometer hardness, such as described in ASTM D2240-05: Standard Test Method for Rubber Property-Durometer Hardness, or by determining the Brinell hardness, such as described in ASTM E10-14: Standard Test Method for Brinell Hardness of Metallic Materials.
  • An article having these characteristics is uniquely useful as a scrubbing article in that the article 10 is sufficiently flexible to allow a user to make contact in, on and about a variety of objects to be scrubbed, while the hardness of the abrasive layer 14 provides the desired scrubbing performance.
  • the above features are readily achieved via the textured layer and UV treatments of the present disclosure as described below.
  • the substrate 12 can be formed from a variety of cloth, foam and sponge materials and may take a variety of forms. Any cloth, foam or sponge material or combination of materials suitable for use as a consumer scrubbing article can be used including, without limitation, polyurethane foams such as the polyurethane foam commercially available under the trade designation, TEXTURED SURFACE FOAM, POLYETHER, M-100SF from AERO TECHNOLOGIES LLC, Newark, Del., USA, cellulose sponges such as the sponge commercially available under the trade designation of SCOTCH-BRITE STAY CLEAN NON-SCRATCH, cat. No. 20202-12 from 3M COMPANY, St. Paul, Minn., USA, and biodegradable L200, N250, S100 sponge cloths from Kalle GmbH, Wiesbaden, Germany.
  • polyurethane foams such as the polyurethane foam commercially available under the trade designation, TEXTURED SURFACE FOAM, POLYETHER, M-100SF from AERO
  • foam refers to a colloidal dispersion made of two distinct phases formed by two dissimilar materials.
  • a foam may also be referred to as a solidified colloidal dispersion.
  • PU polyurethane
  • a gas most commonly carbon dioxide gas formed during foaming reactions
  • This dispersion is subsequently solidified to obtain solid PU foam.
  • the term “sponge” as used herein is likewise used to describe a solidified colloidal dispersion. For example, in forming a cellulose sponge, a salt is dispersed in the cellulose mixture (viscose) to form a distinct dispersed phase.
  • the materials and forms of the substrate 12 can be selected to provide varying ranges of desired properties, such as extensibility, elasticity, durability, flexibility etc., that are particularly suited to a given scrubbing task and/or are particularly suited to forming a texture composition thereon. As indicated, materials useful for substrate 12 may be selected to have durability properties in a wide range.
  • the durability of materials suitable for use in scrubbing articles is often categorized as “disposable” (meaning that an article formed from the material is intended to be discarded immediately after use), “semi-disposable” (meaning that an article formed from the material can be washed and re-used a limited number of times), or “reusable” (meaning that an article formed from the material is intended to be washed and re-used).
  • Scrubbing articles 10 of the present disclosure can be selected or formed to have any of these durability properties. Also as indicated above, materials may be selected based upon their flexibility.
  • a rigid article may be one that is formed of a composition and into a form that substantially holds its shape both when held by a user or when placed on an irregular surface.
  • a more rigid cleaning article may still have some degree of flexibility so as to conform to contours of a surface to be scrubbed.
  • the articles contemplated by the present disclosure may be of the type that return to an original form after having been bent, compressed or otherwise manipulated during a cleaning action.
  • the substrate 12 may be selected or formed to have a surface (e.g., 16 ) that readily accepts the formation of a texture layer 14 thereon.
  • the surface of the substrate may be formed to have a skinned layer to obtain a “smoother”, more uniform, less porous or finer-pore surface.
  • smoother or more uniform is meant that the surface (or surfaces) of the substrate has characteristics that differ from the body 13 ( FIG. 2 ) of the substrate 12 or from a majority of the substrate material not comprising the surface. Even where the surface or surfaces ( 16 , 18 ) may be formed as described above to have smoother surface characteristics, the entire substrate remains of the same chemical composition.
  • the substrate 12 has a thickness “t” ( FIG. 2 ) that advantageously allows a user to hold the article 10 by grasping the article along a side or edge 15 . A user may, however, grasp the article at surfaces 16 , 18 as well. What is important is that the thickness “t” of article 10 allows for easy grasping or holding of the article 10 generally since a “handle” is created by the thick nature of the substrate 12 .
  • the thickness “t” of the substrate 12 may be for example in a range of 2-5 cm.
  • the thickness “t” can be about 2 cm, about 3 cm, or about 4 cm.
  • thicker substrates 12 as described herein, provide a handle by virtue of their thickness. The handle allows for more comfortable holding and ease of use during a scouring or abrading function.
  • the substrate 12 as depicted in the cross-sectional view of FIG. 2 is a single layer structure.
  • the article 10 is configured such that the texture layer 14 can be formed directly onto a surface (e.g., surface formed by and indicated at side 15 , surfaces 16 , 18 , etc.) of the single layer substrate 12 and form a useful scrubbing article, without the need for lamination, bonding, or otherwise joining etc. of the article 10 to another substrate layer.
  • the substrate 12 as well as the article 10 are non-laminate structures.
  • the substrate 12 can, however, include additional layers such as an adhesion promoter layer or tie layer, for example.
  • the substrate 12 is highly conducive to handling by a user otherwise using the article 10 for scrubbing purposes and is selected having regard to the intended use of the scrubbing article 10 .
  • the texture layer 14 is an abrasive composition that is formed on substrate 12 and subsequently UV crosslinked or UV polymerized or both as will be described below.
  • the exact composition of the texture layer 14 can vary depending upon desired end performance characteristics.
  • a texture layer composition is initially formulated and then formed on the substrate 12 .
  • This composition will include a selected resin and may include additional constituents such as mineral(s), filler(s), colorant(s), thickener(s), defoaming agent(s), surfactant(s) etc.
  • the selected composition is UV treatable (i.e., polymerizable, crosslinkable) and imparts the desired features (e.g., manufacturability, scrubbiness, durability, hardness and abrasion resistance) to the scrubbing article 10 .
  • the texture layer composition 14 may be described as “UV crosslinkable” or “UV polymerizable”, or both, prior to UV treatment (e.g., crosslinking, polymerization) of the texture layer 14 and as “UV crosslinked” or “UV polymerized”, or both, after the texture layer 14 has undergone UV treatment.
  • UV crosslinkable e.g., crosslinking, polymerization
  • UV crosslinked e.g., UV polymerized
  • an interim scrubbing article 17 is formed after the texture layer composition 14 is formed on substrate 12 but prior to UV treatment of the composition 14 and will likewise be discussed in further detail below.
  • texture layer 14 comprises a resin composition and may comprise various polymers and/or monomers.
  • Some acceptable resins include those resins selected from the group consisting of styrene-butadiene resin, acrylic resin, phenolic resin, nitrile resin, ethylene vinyl acetate resin, polyurethane resin, styrene-acrylic resin, vinyl acrylic resin and combinations thereof.
  • binder resins useful with the present disclosure include amino resins, alkylated urea-formaldehyde resins, melamine-formaldehyde resins, acrylic 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, phenolic resins such as resole and nonvolac resins, phenolic/latex resins, epoxy resins, and the like.
  • the resins may be provided as monomers, oligomers, polymers, or combination thereof.
  • Monomers may include multifunctional monomers capable of forming a crosslinked structure, such as epoxy monomers, olefins, styrene, butadiene, acrylic monomers, phenolic monomers, substituted phenolic monomers, nitrile monomers, ethylene vinyl acetate monomer, isocyanates, acrylic monomers, vinyl acrylic monomer and combinations thereof.
  • binder resins useful with the present disclosure include amino acids, alkylated urea monomers, melamines, acrylic monomers (including acrylates and methacrylates) such as vinyl acrylates, acrylated epoxies, acrylated urethanes, acrylated polyesters, acrylated acrylics, acrylated ethers, vinyl ethers, acrylated oils, and acrylated silicones, alkyd monomers such as urethane alkyd monomers, and esters.
  • texture layer 14 compositions include compositions having a molecular weight that allows for the formed UV treatable texture layer 14 to have sufficient (e.g., minimum level of) adhesion to the substrate 12 to which it is applied such that it does not readily wipe off of or shift along the substrate surface 16 (i.e., such that the texture layer 14 formed on the substrate stays on the substrate surface 16 after transfer of the texture layer 14 to the substrate 16 and prior and/or subsequent to UV treatment).
  • materials may be selected to have molecular weights or viscosities allowing the texture layer 14 composition to be flowable in a manner that will fill the holes or voids of a stencil pattern during transfer to or forming of the composition on a substrate 12 , sufficiently to adhere to the substrate 12 and to hold the desired pattern shape upon removal of the stencil from the substrate.
  • composition of the texture layer includes a photoinitiator and can optionally include a promoter or a retardant as part of the formulation or composition of texture layer 14 , according to some embodiments of the present disclosure, as described in detail in textbooks such as Ullmann's Encyclopedia of Industrial Chemistry (section “Radiation Chemistry”).
  • exemplary photoinitiators are those provided in TABLE 1A, herein below.
  • Some initiators and promoters that can assist UV crosslinking or UV polymerization, or both, include alpha-hydroxy and alpha-aminoacetophenones or phosphine oxides, commercially available under the trade designations of Darocur 1173, Irgacure 651, Irgacure 369, Irgacure 819, Lucirin TPO, all commercially available from BASF CORP., Florham Park, N.J., USA; those based on aromatic ketones, such as benzophenones, thioxanthones, methylphenylglyoxylate, and camphorquinone; co-initiators, such as N-phenylglycine, ethyl p-dimethylaminobenzoate, and 2-mercaptobenzoxazole; onium salts, such as iodonium or sulfonium salts, commercially available under the trade designations, such as Irgacure 250 (from BASF CORP.
  • the texture layer 14 optionally further includes a particulate additive for enhanced hardness.
  • the scrubbing article 10 of the present disclosure is useful in a wide variety of potential applications having different scrubbing requirements. For some applications, it is desirable that the scrubbing article 10 , and in particular the texture layer 14 , be more or less abrasive than others. While the above-described resin component of the texture layer 14 independently imparts a scrubbiness feature to the article 10 greater than other available scrubbing articles, this scrubbiness characteristic can be further enhanced via the addition of a particulate component. With this in mind, a wide variety of minerals or fillers as known in the art can be employed.
  • Useful minerals include Al 2 O 3 , “Minex” (available from The Cary Co. of Addison, Ill.), SiO 2 , TiO 2 , etc.
  • Exemplary fillers include CaCO 3 , talc, etc.
  • the particulate component additive comprises less than 70% by weight of the texture layer 14 , more preferably less than 50% by weight, most preferably less than 30% by weight.
  • the particulate component may consist of inorganic, hard, and small particles.
  • the “Minex” mineral particulate component has a median particle size of 2 microns and a Knoop hardness of about 560. Of course, other particle size and hardness values may also be useful.
  • the inorganic nature of the particulate component, in conjunction with the non-ionic resin component renders the resulting texture layer 14 amenable for use with any type of chemical solution.
  • the texture layer 14 can further include a colorant or pigment additive to provide a desired aesthetic appeal to the wiping article 10 .
  • a colorant or pigment additive to provide a desired aesthetic appeal to the wiping article 10 .
  • Appropriate pigments are well known in the art, and include, for example, products sold under the trade name SUNSPERSE, available from Sun Chemical Corp. of Amelia, Ohio.
  • Other coloring agents as known in the art are equally acceptable and in some embodiments comprise less than 10% of the texture layer composition by weight.
  • the texture layer composition can include a thickening agent or agents to achieve a viscosity most desirable for the particular printing technique employed and speed of the manufacturing line.
  • appropriate thickening agents are known in the art and include, for example, methylcellulose and a material available under the trade name “RHEOLATE 255” from Rheox, Inc. of Hightstown, N.J.
  • RHEOLATE 255 Another acceptable thickening agent is available from Huntsman International LLC, High Point, N.C., USA under the trade designation of LYOPRINT PT-XN.
  • a thickening agent may be unnecessary depending upon the selected resin and processing technique; however, where employed, the thickening agent preferably comprises less than approximately 40% by weight of the texture layer composition.
  • a salt component may be provided in the composition to aid in causing an ionic reaction between components of an emulsion and thereby likewise generate an increase in the viscosity of the composition, as is known in the art.
  • the composition of texture layer 14 may be non-ionic, according to some embodiments.
  • anti-foaming agents may be included in the composition to provide defoaming or emulsification of the composition.
  • some anti-foaming materials are carrier oils; such as water-insoluble paraffinic and naphthenic mineral oils, vegetable oils, tall oil, castor oil, soybean oil, peanut oil; silicone oils, such as dimethylpolysiloxanes; hydrophobic silica; Hydrophobic fat derivatives and waxes, such as fatty acid esters of monofunctional and polyfunctional alcohols, fatty acid amides and sulfonamides, paraffinic hydrocarbon waxes, ozokerite, and montan wax, phosphoric acid mono-, di-, and triesters of short- and long-chain fatty alcohols, short- and long-chain natural or synthetic fatty alcohols, water-insoluble soaps of long-chain fatty acids, including aluminum stearate, calcium stearate, and
  • the composition of the texture layer 14 may include binder resins, ceramic microparticles or processing agents as described in U.S. Provisional Patent Application Ser. No. 62/121,644, entitled, “Consumer Scrubbing Article with Ceramic Microparticles and Method of Making Same” filed on Feb. 27, 2015 and incorporated by referenced herein in its entirety.
  • the scrubbing article 10 of the present disclosure can be used “dry” or can be loaded with a chemical (solution or solid) for disinfecting, sanitizing or cleaning (e.g., a soap).
  • a chemical solution or solid
  • the chemical may be sprayed onto a surface of the cloth.
  • a chemical may be provided in or as part of the texture layer composition 14 .
  • deposited (e.g., printed) texture layer 14 may comprise printed soap scrubbing dots (e.g., 20 a , 20 b , FIG. 1 ).
  • the chemical solution is released from the substrate 12 as the user wipes the scrubbing article 10 across a surface.
  • the texture layer i.e., scrubbing portions 20 a , 20 b
  • the texture layer may gradually decrease in size as the chemical is consumed during a scrubbing application.
  • any desired chemical solution or solid
  • the chemical solution can be anionic, cationic, or neutral.
  • Manufacture or formation of the scrubbing article 10 of the present disclosure is depicted in the simplified block form of FIG. 4 and generally includes formulating the appropriate texture layer composition, imparting the composition to the substrate 12 (e.g., via printing, coating, etching, embossing, molding, micro-replication, etc.), and then UV treating the deposited or formed composition, thereby resulting in a UV crosslinked or UV polymerized (or both) texture layer 14 .
  • Various techniques for actual depositing or imparting of the composition 14 to the substrate 12 are described below.
  • the texture layer composition is formulated such that constituents may be UV crosslinked and/or UV polymerized as part of the UV treating step.
  • the surface 16 of the substrate 12 may be primed or treated prior to forming a texture layer 14 on a substrate 12 , depending upon the type of substrate, the surface 16 of the substrate 12 may be primed or treated.
  • Priming may involve mechanical, chemical, physical and material application methods.
  • some surface priming methods that may be especially useful with the present disclosure include heating, applying pressure, consolidating, flame treating, melting, cutting or removing substrate material.
  • priming may include application of a chemical primer such as an adhesive.
  • no primer is necessary prior to transfer of the texture layer 14 composition onto the substrate 12 and achieve adequate adhesion.
  • the texture layer 14 composition can be formed on one or more surfaces of the substrate 12 using a variety of known techniques such as printing, (e.g., screen printing, gravure printing, flexographic printing, etc.), coating (e.g., roll, spray, electrostatic), etching, laser etching, injection molding, micro-replicating, and embossing.
  • texture former (of various types) 58 deposits or imparts a UV treatable (i.e., crosslinkable and/or UV polymerizable) texture layer 14 onto substrate 12 in any desired pattern, such as any of the various patterns described above.
  • the texture former 58 can include, for example, a printer, roll coater, spray coater, etching device, laser, embossing equipment, microreplication machine, etc.
  • a printing method for imparting the texture layer 14 to the substrate 12 may be advantageous in that printing techniques can provide a relatively high-definition (e.g., sharp) printed composition 14 .
  • Some printing techniques may also afford relative ease of manufacture and lower cost as compared to other texture forming techniques described above.
  • the texture layer 14 covers less than an entirety of the substrate surface to which it is transferred (i.e., the surface 16 of FIG. 2 ), and is preferably formed in a pattern including two or more discrete sections.
  • the pattern can consist of a plurality of dots as shown in FIG. 1 .
  • the lines can be connected to one another.
  • the texture layer consists of a plurality of discrete lines, dots, and/or images.
  • other desirable pattern components such as a company logo, can be formed.
  • a more random distribution of texture layer sections can be imparted to the substrate 12 .
  • the present disclosure contemplates that virtually any pattern can be obtained.
  • an interim scrubbing article 17 is formed.
  • the interim scrubbing article 17 is characterized as having a UV treatable texture layer 14 that has not yet undergone UV treatment (i.e., the UV light exposure step has not yet been performed).
  • the interim scrubbing article 17 may thus also be referred to as an interim textured scrubbing article 17 .
  • the interim scrubbing article 17 may next be allowed to remain undisturbed (allowed to wait) for a period of time or may directly or immediately proceed to an optional curing step.
  • the interim scrubbing article 17 may undergo an optional curing step whereby the article 17 is exposed to heat, such as given by an oven ( 60 , FIG. 4 ) or infrared light (not shown), for a short period of time.
  • Oven and/or infrared light exposure times may vary and may for example be in a range of less than 5 minutes, 3 minutes or less, or 2 minutes or less.
  • infrared exposure often infrared light exposure is more cost effective than heating via an oven.
  • an additive may be required to allow absorption of the infrared light by the composition.
  • An example of an additive useful for aiding in infrared absorption is carbon black.
  • the optional step can facilitate a stronger or more desirable adherence of the texture layer 14 to the substrate surface 16 and can provide a more stable, less tacky texture layer 14 .
  • subjecting the texture layer 14 to the UV light itself can likewise be enough to complete polymerization or crosslinking such that the heat or infrared treatment) is unnecessary.
  • no water or solvent is present in the texture layer 14 prior to UV treatment, thus no evaporation step may be desired or necessary.
  • the texture layer composition 14 comprises a material that does not require a water based or solvent based resin or compound to achieve material flow sufficient to transfer to a substrate (e.g., 12 ) in a desired pattern.
  • the interim textured scrubbing article 17 is subjected to UV radiation to crosslink or polymerize, or both, the texture layer 14 composition provided thereon.
  • a UV light 62 irradiates UV treatable texture layer 14 of interim scrubbing article 17 to thereby form a UV treated (i.e., UV crosslinked and/or UV polymerized) texture layer 14 on substrate 12 thus forming the resultant scrubbing article 10 .
  • Triarylsulfonium hexafluoroantimonate salt in propylene carbonate commercially available under the trade designation CPI6976 from ACETO Corp., Port Washington, NY, USA.
  • Filler-2 Natural Wollastonite mineral powder with a specific gravity of 2.9 at 25° C. commercially available under the trade designation of NYCO from MINERA ROCA RODANDO S.
  • TABLE 1A All ingredients of TABLE 1A were weighted out to the nearest 0.1 grams in separate rigid plastic containers in desired quantities.
  • a mixture was prepared by placing all ingredients in a rigid plastic container. The photoinitiator was placed last and care was exercised not to expose the photoinitiator to excessive ambient light. The mixture was first mixed by hand for 30 seconds and a lid was secured on the container before starting the mixing. The mixture was then mixed for 30 seconds in a laboratory centrifugal mixer commercially available from FLACKTEK INC., Landrum, S.C., USA under the trade designation of SPEEDMIXER DAC 400.1 VAC-P. The rotation speed of the mixer was set to 2500 rpm.
  • foam and cellulose sponge specimens were used as-received. It is evident that any other thick non-woven substrate would be similarly useful.
  • An example of a commercially available thick non-woven substrate was the non-woven bath sponge with a thickness of 3 cm, commercially available under the trade designation of ACTIBEL TONIFICANTE from 3M ESPANA, S.A., Madrid, SPAIN.
  • a metal stencil with the texture pattern shown in FIG. 1 was placed on top of the substrate specimen.
  • the substrate was secured on a flat laboratory bench by applying adhesive tape on its edges.
  • a metal stencil with the desired printing pattern was placed on top of the substrate specimen.
  • Approximately 50 grams of the prepared printing mixture was placed on the stencil with the help of a wooden applicator.
  • the printing mixture was then applied on the printing pattern of the stencil with a shearing motion while applying hand pressure downwards, with the help of a hand-held squeegee. It was observed that the printing mixture filled the holes of the printing pattern and was transferred onto the substrate specimen.
  • the stencil was removed and the printed substrate specimen was left undisturbed on a laboratory bench for one minute.
  • the printed specimens were subjected to UV radiation under a standard D-bulb (EPIQ 6000, commercially available from Heraeus Noblelight America LLC, Gaithersburg, Md., USA), in a continuous line with a line speed of 9.33 m/min.
  • the D-bulb had a power of 600 W.
  • the abrasive properties of the printed specimens were tested with a Frazier Schiefer Uniform Abrasion Tester, commercially available from Frazier Precision Instrument Company, Inc. Hagerstown, Md., USA. In the test, the printed specimens were first saturated with deionized water and then used as the abradant. An optically transparent, rigid plastic disk was used as the substrate to be abraded. The disk was laser cut with a diameter of 10.2 cm and with a thickness of 0.3 cm from a rigid plastic sheet commercially available from Evonik Industries AG, Essen, Germany, under the trade designation of ACRYLATE GP. During the test, the abradant abraded the disk with a rotation speed of 250 rpm and the test was terminated when total revolutions reached 1000. The weight of the disk was measured before and after the test to the nearest 0.001 grams. The difference between the weight values was recorded and reported as the percentage of the initial weight in TABLE 5A (under the column of ‘abraded weight from the disk after 1000 revolutions’).
  • Flow agent 1 Cross-linkable silicone acrylate, commercially available as Tegorad 2100 from Evonik Industries AG, Essen, Germany
  • Flow agent 2 Polydimethylsilane with a viscosity of 1000 cPs, commercially available as Element14* PDMS 1000 from Momentive Performance Materials, Inc., Waterford, NY, USA.
  • Photoinitiator-1 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide commercially available as IRGACURE 819 from BASF CORP., Florham Park, NJ, USA.
  • Photoinitiator-2 Diphenyl(2,4,6-trimethylbenzoyl)-phosphinic acid ethyl ester commercially available as LUCERIN TPO-L from BASF Corp, Florham Park, NJ, USA.
  • Foam 2 Open cell, polyurethane foam with an approximate density of 26 kg/m3, approximately 18 mm thick commercially available from NCFI Polyurethanes, Inc., Mount Airy, NC, USA
  • ink composition 3 3.0 g of photoinitiator 2 was added to a mixing container with 161.7 g of the acrylate and mixed for several minutes until the photoinitiator was well mixed in the acrylate, then 141.1 g of filler 1, 7.9 g of filler 2, 0.2 g of pigment, 4.7 g of flow agent 1, and 4.7 g of flow agent 2 were added to the container and mixed for 3 minutes at 2500 rpm.
  • the compositions of the two inks are listed below:
  • Foam 1 cellulose sponge cloth
  • Foam 2 was prepared by cutting into squares approximately 17 cm by 17 cm.
  • the printing composition was screen printed onto substrates Foam 1 and Foam 2 using a metal screen with circular openings approximately 1.8 mm in diameter; each opening was separated from other openings by a distance of approximately 2 mm.
  • the ink was forced through the holes in the screen using a squeegee.
  • the resulting printed articles therefore had a pattern of printing composition dots.
  • the printing composition dots were either raised or at the sponge surface, depending on the substrate and amount of printing composition applied.
  • the printing composition dots were raised with a cured printing composition dot height of approximately 0.5-1.6 mm.
  • the more porous polyurethane sponge of Foam 2 the printing composition dots were at the surface of the sponge (but exposed when the sponge was compressed).
  • Printing composition viscosity will have an effect on printing composition dot height. A more viscous printing composition would result in a higher printing composition dot height, and a less viscous printing composition would result in a lower printing composition dot height.
  • the printing composition viscosity was not varied, however: both printing compositions were on the order of 10,000 cPs (as measured with a Brookfield Model RVTD viscometer).
  • Printing compositions were cured under either 395 nm LED ultraviolet lamps (Phoseon) or a D-bulb lamp (Heraeus-Fusion), without nitrogen purge. Curing was done at line speeds up 60 m/min (200 ft/min). At this speed using the D-bulb, printing compositions were cured with a measured energy as low as 223 mJ/cm2, 83 mJ/cm2, 9 mJ/cm2 and 267 mJ/cm2 for UVA, UVB, UVC, and UVV, respectively. At this speed, for the 395 nm LED bulb, printing compositions were cured with a measured energy as low as 42 mJ/cm2.
  • UV Curable epoxy binder OPV9051 available from UV Resin Private Limited, 339, Shivaji Nagar, Indore-3, Madhya Pradesh, INDIA.
  • Photoinitiator-1 3 wt % CPI 6976 available from Aceto Corporation, New York, NY, USA
  • Photoinitiator-2 1 wt % Irgacure 819 available from BASF CORP., Florham Park, NJ, USA
  • Substrate Scotch Brite ® Sponge Wipe having a moist dimension of 15 cm L ⁇ 18 cm W ⁇ 4.975 mm D available from 3M India Ltd., 48-51, Electronic City, Hosur Road, Bangalore 560100, INDIA.
  • the substrates were used as-is except in the case where the moisture content was high to a degree based on hand-feel. If upon touching, the user's hand did not feel moist, it was not considered “wet.” If upon touching, a user's hand felt wet, the substrate was placed in a HAO-L oven set at 105 degrees C. for 15 minutes (oven available from Thermocon Instruments (P) Limited, 872, HAL, 3 rd Stage, (opp BEML gate), Bangalore-75, INDIA).
  • the three wipes were further tested to evaluate the impact of drying and moistening the wipe on stability of the printed texture layer. It was observed that after wetting the wipe and then drying at 105 degrees C. for two hours in a TEMPO dryer model no. TI 126D (available from TEMPO Instruments & Equipments (1) PVT. LTD., To Syringe Comp, W.E. Highway, B/H, Samrat Hotel, Pandurang Wadi, PO: Mira, Dist.: Thane-401 104, INDIA), no cracks were found in the texture layer on any of the three wipes. The wipes were then re-wetted and, again, no cracks formed in any of the printed texture layer.
  • TI 126D available from TEMPO Instruments & Equipments (1) PVT. LTD., To Syringe Comp, W.E. Highway, B/H, Samrat Hotel, Pandurang Wadi, PO: Mira, Dist.: Thane-401 104, INDIA
  • the three wipes were also washed for two hours in a Samsung WA80K8SEG/XTL washing machine (available from Samsung India, Mumbai, Maharashtra, INDIA) at 60 degrees C. In this experiment, a noticeable loss of the printed texture layer was observed in each of the wipes.
  • the one pass wipe suffered considerable printed textured layer loss.
  • the two pass wipe had noticeable loss of the printed textured layer but the printed textured layer did not crack.
  • the three pass wipe retained the most of the printed textured layer and the printed texture layer only slightly wore off. The performance of the two pass wipe and the three pass wipe were deemed satisfactory in this regard.
  • each of the three wipes were tested per AATCC 8 test method and the test was continued even after 10 turns to check the performance consistency of abrasive coating on a sponge wipe substrate.
  • the equipment used for testing was a MECRUB XT MAG-C0221 crock meter available from MAG SOLVICS PRIVATE LTD, Coimatore-642109, INDIA.
  • the wipes were tested until a severe loss of printed texture layer occurred. A severe loss of printed texture layer occurred in 10 cycles for the single pass wipe, 50 cycles for the two pass wipe and 10 cycles for the three pass wipe.
  • the one pass, two pass and three pass wipes were also tested on a crayon stain to determine how many scrubbing passes would be required to remove the stain.
  • This test was conducted using a 57 mm long ⁇ 7.5 mm diameter wax crayon available from Camel Wax Crayons, Kokuyo Camlin Ltd, 48/2, Hilton House, Central Road, MIDC, Andheri(E), Mumbai-400093, INDIA.
  • the Camlin Wax crayon was used to make a stain.
  • a circle of 3 cm in diameter was made on a granite table top and was colored in by manually holding the crayon like a pencil.
  • the granite table top was a regular, non-polished surface without any deep cracks, holes or uneven surface areas. All of the crayon stains were made at the same time.
  • the test wipe made moist and pliable with water and the printed side was manually wiped over the crayon stain in the same way used by typical consumers of such wipes for in-home use.
  • the test for each wipe was conducted by the same operator at the same time to adopt generally uniform speed and pressure throughout the test in attempts to avoid variations in the results.
  • the number of strokes need to clean the crayon stain completely from the granite test surfaces was recorded.
  • Each pass of the wipe constituted one stroke. Post cleaning of the stain, the granite test surface was cross-checked to ensure the stain was completely cleaned from the test surface.
  • TABLE 3C the one pass, two pass and three pass wipes all performed better than many of the other scrubbing articles tested.

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US10925456B2 (en) 2018-08-13 2021-02-23 Bright Box Lab, LLC High aspect ratio layered scrub
US11026552B2 (en) 2016-01-19 2021-06-08 3M Innovative Properties Company Consumer scrubbing article with stain release and method of making same
USD949499S1 (en) 2018-08-13 2022-04-19 Bright Box Lab, LLC Minnesota shaped porous open celled scrub

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MX2016003384A (es) 2016-11-28
CL2016000622A1 (es) 2016-10-14
KR20160108297A (ko) 2016-09-19
EP3083787A1 (en) 2016-10-26

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