WO1999003007A1 - Composition reflechissante - Google Patents

Composition reflechissante Download PDF

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Publication number
WO1999003007A1
WO1999003007A1 PCT/US1998/014585 US9814585W WO9903007A1 WO 1999003007 A1 WO1999003007 A1 WO 1999003007A1 US 9814585 W US9814585 W US 9814585W WO 9903007 A1 WO9903007 A1 WO 9903007A1
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WO
WIPO (PCT)
Prior art keywords
retroreflective
substrate
volume
composition
matrix material
Prior art date
Application number
PCT/US1998/014585
Other languages
English (en)
Inventor
Daniel Rizika
Original Assignee
Reflective Technologies, Inc.
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 Reflective Technologies, Inc. filed Critical Reflective Technologies, Inc.
Priority to EP98934543A priority Critical patent/EP0995136A1/fr
Publication of WO1999003007A1 publication Critical patent/WO1999003007A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface
    • G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix

Definitions

  • the present invention relates generally to a retroreflective composition and, more particularly, to a retroreflective composition containing non-volatile matrix material and a plurality of retroreflective microsphere beads.
  • the retroreflective composition which can brilliantly reflect light at nighttime while remaining inconspicuous in daytime.
  • the retroreflective composition should have hand comfort, breathability comfort and be capable of providing for daytime colored appearance.
  • the retroreflective coating should wash well under normal conditions and pass appropriate industry standards.
  • the present invention is a retroreflective composition that overcomes the above and other drawbacks and deficiencies of conventional compositions, and a method for manufacturing the same.
  • a retroreflective composition for application to a substrate includes a nonvolatile matrix material having a volume and a weight; a volatile constituent; a volume of retroreflective microsphere beads; and a volume of pigment particles having a dimension of not greater than 2 microns.
  • the quantity of pigment particles is sufficient to enable the substrate to reflect color from the pigment particles under daytime conditions.
  • a preferred ratio of the volume of the matrix material to the sum of the volume of the microsphere beads and the volume of the pigment particles is in the range of 0% to 10,000%.
  • the retroreflective composition also includes an adhesion promoter coating the retroreflective microsphere beads.
  • the adhesion promoter preferably has weight of between .05%) and 1% of the microsphere bead weight.
  • the adhesion promoter has a weight of between .05% and 1% of the weight of the reflective composition.
  • the retroreflective composition upon application of the retroreflective composition to the substrate, has a semi-saturated microspheric density of between 20 and 2,000 microspheric beads per square millimeter of substrate.
  • a substrate having an appearance of being more retroreflective at night when exposed to a beam of light than when exposed to diffuse light is disclosed.
  • a coating layer that includes a nonvolatile matrix material, a volatile constituent, a plurality of retroreflective microsphere beads, and a quantity of pigment particles having a dimension of not greater than 2 microns.
  • the quantity of pigment particles is sufficient to enable the substrate to reflect color from the pigment particles under daytime conditions and the ratio of the matrix material volume to a volume of the retroreflective microsphere beads plus the pigment particles is in the range of 0% to 10,000%.
  • the coating layer also includes a quantity of retroreflective microsphere beads to yield a semi-saturated microspheric density of between 20 and 2,000 per square millimeter of substrate.
  • the coating layer is applied to an entire surface of the substrate to form a silhouette when viewed under focused rays of light.
  • the pigment particles have a diameter/thickness of less than 2 microns.
  • the substrate is a fabric.
  • the fabric is configured to form a garment.
  • a retroreflective composition for application to a substrate includes a nonvolatile matrix material having a volume and a weight; a volume of retroreflective microsphere beads; and a volume of pigment particles having a dimension of not greater than 2 microns.
  • the ratio of the volume of the matrix material to the volume of the microsphere beads plus the volume of the pigment particles is in the range of 0% to 10,000%.
  • the ratio of the volume of the matrix material to the volume of the retroreflective microsphere beads plus the volume of the pigment particles is approximately between 300%) and 800%.
  • retroreflective composition also includes an adhesion promoter, having a weight of between .05%) and 1% of the microsphere bead weight, coating the retroreflective microsphere beads.
  • the adhesion promoter has a weight of between .05% and 1%) of a weight of the reflective composition.
  • the retroreflective composition upon application of the retroreflective composition to the substrate, has a semi- saturated microspheric density of between 20 and 2,000 microspheric beads per square millimeter of substrate.
  • a method for treating a substrate with a retroreflective composition includes the steps of: (a) combining a volatile constituent with a non-volatile matrix material to form a coupler compound; (b) adding retroreflective microsphere beads and pigment to the coupler compound to form a retroreflective composition; and (c) applying the retroreflective composition to a substrate.
  • the substrate is a fabric and wherein the step (c) comprises the step of: (1 ) applying the retroreflective composition to the fabric using a rotary screen printer.
  • said step (c) comprises the step of: (1) applying the retroreflective composition to the substrate using any one or more of a flex-o-graphic technique, gravure roll coating technique, blade coating technique, full immersion coating technique and pressurized spray technique.
  • the method also includes the step of (d) before the step (c), coating the retroreflective microsphere beads with an adhesion promoter.
  • the method also includes the steps of (d) cross linking said matrix material. In one embodiment, this is performed by heating then cooling the matrix material.
  • ultra violet lighting is applied to the matrix material.
  • the matrix material is exposed to an electronic beam.
  • the retroreflective composition may include a pigment which will correspond to a color of a substrate or of a desired image, while simultaneously provides brilliant retroreflectivity and attractive daytime appearance.
  • a still further advantage of the present invention is that it provides a retroreflective composition which can be either evenly distributed over an entire surface of a substrate or applied in a patterned form or design.
  • the colored retroreflective composition may be pigmented to impart a desired color.
  • a still further advantage of the present invention is that it provides a composition which can be applied to substrates in a solid or patterned form projecting a full reflective silhouette area during nighttime reflectivity.
  • rotary screen printing provides a technologically feasible, commercially viable, and economically efficient means of applying the current invention to fabric.
  • Figure 1 is a cross sectional view of one embodiment of the retroreflective composition of the present invention applied to a substrate;
  • Figure 2 is a graph depicting the volume ratio between the percent non-volatile matrix material and the percent non-volatile microsphere beads plus pigment particles, referred to as the Matrix Material to Bead+Pigment Volume Concentration, or "MBPVC";
  • Figure 3 is a table illustrating the density and zero wash reflectivity, dry and wet crock and total volatile volume percent for various MBPVC ratios applied to a Ripstop nylon substrate;
  • Figure 4 is a photograph of the Ripstop nylon substrate tabularized in Figure 2 having an MBPVC ratio of 20%
  • Figure 5 is a photograph of the Ripstop nylon substrate tabularized in Figure 2 having an MBPVC ratio of 100%;
  • Figure 6 is a photograph of the Ripstop nylon substrate tabularized in Figure 2 having an MBPVC ratio of 200%;
  • Figure 7 is a photograph of the Ripstop nylon substrate tabularized in Figure 2 having an MBPVC ratio of 400%;
  • Figure 8 is a photograph of a 100% Cotton T-shirt substrate tabularized in Figure 2 having an MBPVC ratio of 350%, being 100% solid;
  • Figure 9 is an enlarged cross sectional view of the fabric treated with the composition of the present invention.
  • Figure 10 is an enlarged cross sectional view of the fabric treated with the composition of the present invention in which multiple layers of microsphere beads have been applied;
  • Figure 11 is a scanning electron microscope photograph of a fabric illustrated in Figure 10; and Figure 12 is a table illustrating an exemplary retroreflective composition of the present invention. Detailed Description
  • FIG. 1 is a cross-sectional view of one embodiment of the retroreflective composition of the present invention applied to a substrate.
  • the retroreflective composition 100 includes a matrix material 102 securing a plurality of microsphere beads 104A-104D (collectively and generally referred to as microsphere beads 104) to a substrate 106.
  • the microsphere beads 104 are coated with a retroreflective material 108 and are typically completely or partially embedded within the matrix material 102.
  • the substrate 106 is a base material to which the retroreflective composition 100 may be applied. Examples of substrate 106 include, for example, textiles, fabric (wovens, non-wovens, knits etc.), paper, leather, plastic, glass, metals, wood, rubber, synthetic rubber, composites, concrete, asphalt, trees and other materials.
  • the matrix material 102 is preferably a substantially transparent or translucent nonvolatile film-forming resin.
  • the matrix material 102 serves to bind pigment particles 1 10 and microsphere beads 102 to the substrate 106.
  • the matrix material 102 may include, but not be limited to, acrylic, PVC, urethane polymers or unsaturated monomers, such as vinyl chloride, dichloroethene, acrylic acid, methacrylic acid, acrylamide, acrylonitrile, acrylic acid esters, vinyl ethers and vinyl esters, styrene and diolefins, like butadiene, or any combination thereof.
  • the matrix material 102 may also include but not be limited to, oils, resins, epoxy, solvents or any combination thereof.
  • the matrix material 102 may be any well known resin or emulsion appropriate to bind the pigment particles 1 10 and beads 104 to the selected type of substrate 106.
  • the matrix material 102 is the chemical ingredient which binds the pigment particles 110 and microsphere beads 104 to a substrate 106.
  • the matrix material 102 forms a matrix material layer 112 on the substrate 106.
  • the matrix material layer 112 is the layer of matrix material 102 which, upon treatment of a substrate 106, forms on a surface of the substrate 106 as a result of either the evaporation of the volatile constituent from the non-volatile constituents and/or the curing/setting of the matrix material 102 as a result of elevated temperature, ultra violet light, electronic beam or suitable alternative.
  • This combination of constituents is generally referred to as coupler compound.
  • the coupler compound may also include any necessary additional ingredients to facilitate application to a substrate 106.
  • the coupler compound may include a dispersant, thickener, defoamer, fixer, antifoamer, adhesion promoter, volatile constituent, plastisizers and fillers, and ammonium hydroxide.
  • the volatile constituent may be any liquid component, if applicable, which is conducive to evaporation.
  • the matrix material layer 1 12 Upon application to the substrate 106, the matrix material layer 1 12 preferably has a thickness of less than three-quarters of the diameter of a microsphere beads 104.
  • the matrix material 102 forms a layer 1 12 between the surface of the substrate 106 and the microsphere bead 104D having a thickness of less than one quarter of the diameter of a microsphere bead 104.
  • This matrix material layer 1 12 provides a vehicle in which the pigment particles 110 are maintained, and provides both a layer into which the retroreflective microsphere beads 104 are embedded and/or a surface by which the retroreflective microsphere beads 104 may be covered.
  • this matrix material layer 1 12 is a result of the ratio of matrix material 102 to microsphere beads 104 plus pigment 1 10, and from properly controlling the application variables (e.g. viscosity of the coupler compound, application speed, application pressure, and the drying/curing process) for a given substrate.
  • application variables e.g. viscosity of the coupler compound, application speed, application pressure, and the drying/curing process
  • the composition 100 is retroreflective.
  • Retroreflectivity refers to the reflecting rays of light which are returned in directions proximate to the opposite of the direction of the incident rays. That is, proximate to the originating path of the incident rays.
  • the light-reflective material which coats each of the microsphere beads to enable the microsphere beads to be retroreflective is preferably a metallic flake such as aluminum.
  • other retroreflective means 108 may be used.
  • the microsphere beads 104 are coated with a non-metallic material such as organic compounds. Other non-metallic materials such as those described in U.S. Patent No. 3,700,305 to Bingham may also be used.
  • the resulting microsphere beads 104 are referred to herein as retroreflective microsphere beads.
  • the retroreflective microsphere beads 104 are hemispherically coated; that is, the retroreflective means covers approximately one half of the microsphere bead's surface area. In alternative embodiments, this outer surface may is also colored to improve daytime unnoticability.
  • the microsphere beads 104 have a preferred diameter in the range of approximately 5 to 500 microns and more preferably 20 to 200 microns. In accordance with one preferred embodiment of the present invention the microsphere beads 104 have an average diameter of approximately 25 to 75 microns. In another preferred embodiment, the diameter of the microsphere beads 104 is approximately 50 microns. In a particular embodiment, the beads
  • the microsphere beads 104 are constructed of glass and have a diameter of approximately 50 microns. Empirical studies have shown that at this preferred diameter the microsphere beads 104 have the highest retroreflectivity and daytime unnoticability. It is understood, however, that other diameters which achieve high retroreflectivity and daytime unnoticability are possible. In addition to the myriad of characteristics of the retroreflective composition 100 itself, it is apparent that the type of substrate 106 also bears on the optimum bead size. For example, on fabric substrates if the average bead size exceeds 100 microns, the flexibility, launderability, handling, daytime unnoticability and crock standards begin to degrade.
  • the hemispherically-coated microsphere beads 104 have a reflective means 108 coated thereon to achieve a desired refractive index for a given application.
  • the refractive index of retroreflective microsphere beads 104 is approximately in the range of 1.5 to 2.5, subject to the desired use, and may be clear or colored, as well as hollow or solid.
  • the refractive index is approximately 1.9 to provide efficient retroreflectivity and daytime unnoticability. The 1.9 refractive index provides such retroreflectivity and daytime unnoticability when the retroreflective microsphere beads are 104 viewed under normal dry conditions.
  • the optimum value for the refractive index of retroreflective microsphere beads is greater than 2.0, typically in the range of 2.1 to 2.5.
  • retroreflective means 108 there are many known methods for applying the retroreflective means 108 to the microsphere beads 104.
  • One preferred approach is as follows: A carrier web is first coated with a layer of adhesive in which the microsphere beads 104 are removably embedded in a position adjacent to the surface of the carrier web.
  • the adhesive should be capable of being dissolved or the microsphere beads 104 should be able to be removed from the adhesive at a later stage.
  • the adhesive binder may be applied to the carrier web by screen printer, blade, rod, roller, direct gravure, spray or any method that is suited to laying down a specific quantity of adhesive over a defined area.
  • the adhesive binder is preferably deposited to leave a thickness of approximately 50%> of the diameter of the microsphere beads 104 when the adhesive is dried, and as such the deposit should allow for the evaporation of any solvent content in the adhesive when the drying/curing process takes place.
  • the microsphere beads 104 are deposited on the tacky web.
  • the microsphere beads 104 are preferably applied over a maximum possible area and are also preferably embedded to approximately half their diameter in the adhesive.
  • the spheres 104 may be distributed over the surface area by any well-known means such as cascading, sifter or aerated hopper onto the tacky adhesive binder. Other techniques are considered to be within the scope of the present invention.
  • the carrier web is then passed through pressure rollers to ensure that the retroreflective microsphere beads 104 are securely embedded in the adhesive and are located adjacent to the carrier web surface.
  • the rollers typically also press any loose spheres 104 into any available spaces to insure maximum coverage, to achieve a monolayer of spheres over the total surface area of the carrier web. Excess microspheres may be removed by brushing or suction.
  • the coated carrier web is then passed through an oven or drying/curing facility to activate the adhesive binder and/or to further drive off any solvent content of the adhesive.
  • the coated carrier web is then passed through a region of a high vacuum deposition chamber wherein a layer of retroreflective means is deposited over the exposed hemispheres of the microsphere beads 104.
  • High vacuum deposition procedures and application methods concerning this process are well known.
  • An aluminum deposit of approximately 50 to 250 Angstroms is sufficient to provide an opaque deposit with good reflecting properties.
  • Alternative means of depositing a layer of retroreflective means are sputtering, electroplating, spraying, heat transfer or coating, all of which are considered to be well-known in the art.
  • both retroreflective microsphere beads 104 and pigment particles 1 10 are applied to the coupler compound to form the retroreflective composition 100 of the present invention.
  • Pigment/dye particles are well-known in the art.
  • the term pigment particle refers to a colored or non-colored particulate solid which is insoluble in, and essentially physically and chemically unaffected by, the vehicle in which particles are incorporated.
  • the pigment particles may be numerous colors and may be synthetic, synthetic organic or organic materials.
  • Synthetic materials may include, for example, carbon black, titanium dioxide of the rotile and anatase types, copper and aluminum alloys, iron oxide, titanium dioxide coated glimmer and others. It should be understood that various factors may be considered in the selection of synthetic pigments, including cost, the fastness properties, and the brilliance and coloring capability.
  • Organic pigments may include, for example, azoic, carbazole, diarylide, pyrazolone, phthalocyanine, quinacridone, vat, black and white and others.
  • the pigment particles include reflective pigment particles such as nacreous (pearlescent) or metallic flake in order to achieve fashionable luster-like colors or a traditional reflective (metallic) appearance.
  • reflective pigment particles such as nacreous (pearlescent) or metallic flake in order to achieve fashionable luster-like colors or a traditional reflective (metallic) appearance.
  • Transparent pigment particles as compared to opaque pigment particles, yield improved retroreflectivity under nighttime conditions. It is understood that other types of pigments may also be used. For example, glow in dark, fluorescent and phosphorescent pigments/dyes may be used to achieve a desired combinational effect, such as fluorescent in daytime and retroreflective in nighttime.
  • the pigment particles include reflective pigment particles in combination with untreated glass beads rather than hemispherically reflectorized glass beads.
  • Untreated glass beads in combination with reflective pigment particles such as nacreous or metallic flakes may be used to achieve a desired retroreflectivity.
  • the glass beads are randomly positioned on top of the nacreous or metallic flakes which evenly coat the substrate. Light rays penetrate the glass beads, reflect off of the nacreous or metallic flakes and return through the glass beads towards the source of the light.
  • the metallic flake is aluminum. In other embodiments, colored metallic flakes are used. Such embodiments are relatively inexpensive to manufacture and achieve similar daytime unnoticability and nighttime retroreflectivity as the above preferred embodiments. It is noted that additional color pigment particles less than 2 microns may be added to achieve daytime unnoticability or fashionable colors as desired.
  • pigments are commonly available.
  • synthetic pigments are commonly available in several grades or size ranges.
  • the pigment particles preferably have a thickness or diameter of less than 2 microns.
  • the pigment particles 1 10 have a thickness/diameter of less than 1 micron.
  • Such pigment/dye particles of less than 1 micron uniformly coat the substrate 106 in a continuous manner. The small size of the pigment/dye particle enables the pigment/dye to bond directly to the substrate 106.
  • a pigment particle with a thickness/diameter of less than 2 microns which is substantially smaller than the preferred size of the microsphere beads 104 of the present invention, does not deter retroreflection at nighttime and enhances daytime unnoticability, while providing flexibility, and passing crock, launderability, and crock reflectivity loss industry standards.
  • the crock standard is a standard established by the American Association of Textile Chemists and Colorists (AATCC) Crockmeter Method used in the industry to measure the amount of colorant which is transferred from the surface of a colored fabric to another surface, principally by rubbing.
  • AATCC American Association of Textile Chemists and Colorists
  • the percentage of reflectivity lost when the AATCC Crockmeter Method is applied to a substrate is referred to as the crock reflectivity loss.
  • Other standards often not achieved by conventional retroreflective compositions are the laundering standard and the hand standard.
  • the laundering standard is a standard established by the AATCC standardization of Home Laundry Test Conditions which is used in the industry to measure the amount of colorant which is lost as a result of one to twenty (20) wash/dry cycles.
  • the hand standard is a standard established by the AATCC for subjective evaluation of fabric hand test method used in the industry to measure the tactile qualities of a fabric.
  • the tactile qualities of a fabric include the softness, drape, flexibility, firmness, elasticity, fineness, resilience and other qualities perceived by touch.
  • pigment particles 1 10 having a dimension size of less than 2 microns enable the pigment particles 110 to flow evenly throughout the entire surface area of the matrix material 102.
  • the pigment particles 110 are enabled to lodge on top of, adjacent to, and beneath retroreflective microsphere beads 104.
  • the advantage of this pigment particle placement is that the daytime unnoticability is enhanced by the uniformity which will necessarily occur upon the application of the retroreflective composition 100 to a substrate 106.
  • the pigment particles of the present invention attach to fibers in a continuous fashion.
  • the matrix material 102 is approximately 150 - 175%> of the volume of the pigment particles 110 plus the retroreflective microsphere beads 104.
  • the less than 2 micron diameter sized pigment particles is sufficiently small as to not interfere with the flexibility, wearability, breathability, and crock, launderability, crock reflectivity loss industry standards, while requiring a small volume of matrix material to adhere them to the substrate.
  • the matrix material 102 is approximately 100 - 200%), less than 300%>, and greater than 75%>, although other ratios are considered to be within the scope of the present invention.
  • the noted preferred microsphere diameter of approximately 50 microns does not prevent any of the pigment particles 110 from entering and adhering in the matrix material 102.
  • the pigment particles 1 10 have sufficient space within which to lodge between the microsphere beads 104, or gather below and/or on the top surface of the microsphere beads 104, to provide sufficient pigment throughout the resulting coated substrate surface.
  • the pigment particles 1 10 may remain in the matrix material 102 provided there was sufficient room between the microsphere beads 104 to allow the pigment particles 1 10 to pass through.
  • the microsphere beads 104 may provide a support surface on which other pigment particles 1 10 are deposited.
  • a pigment particle 1 10 having a dimension greater than 2 microns will likely interfere at nighttime with a light source from contacting the underlying microsphere bead 104, and also prevent the return of the retroreflective rays. With pigment particles of less than 2 microns, the pigment particles 1 10 do not adversely interfere with the retroreflective properties taught by this invention.
  • the surface area that can be covered is far greater the smaller the pigment size (that is, less than 2 microns). This has significant benefits in that less pigment is required to achieve desired colors. Either additional matrix material or retroreflective microsphere beads may be added in place of the pigment particles to optimize the end use product as desired.
  • a volatile constituent may be added to the matrix material 102 in the formation of the coupler compound. This may be done, for example, to minimize the amount of the matrix material 102 on a substrate 106, or to provide increased fluidity of the matrix material 102. Also noted above is the addition of other ingredients to the coupler compound to facilitate application to the substrate 106.
  • the volatile constituent may consume any predetermined volume-percent of the coupler compound, from 0 to 99%).
  • the volatile constituent is water and comprises approximately 65%> volume percent of the coupler compound of the present invention.
  • there is no volatile constituent that is, 100% of the coupler compound is non-volatile.
  • the retroreflective microsphere beads 104 are added to the coupler compound to form the retroreflective composition 100 of the present invention.
  • the retroreflective composition 100 is then applied to a substrate 106 and cured.
  • the matrix material 102 Upon evaporation/curing/heat setting of the coupler constituent, the matrix material 102 forms a matrix material layer 112 into which the retroreflective microsphere beads 104 are embedded and may be covered. As shown in Figure 1 , microsphere beads 104 are not all covered with the matrix material layer 102. As noted above, in one embodiment, the matrix material layer 1 12 has a thickness of less than one quarter of the diameter of a microsphere bead 104 between the surface of the substrate 106 and the microsphere beads 104B and 104C.
  • coupler compound may be included in the coupler compound to achieve desired results.
  • anti-foaming and defoaming agents may be included in the coupler compound to minimize foaming of the compound as it is being formulated or when it is applied to a substrate.
  • adhesion promoters may be included in the coupler compound. Adhesion promoters include, but are not limited to, titanates, organofunctional silanes, zirconates, zircoaluminates, alkyl phosphate ester, and chartwell.
  • silanes include, but are not limited to, gamma-Glycidoxypropyltrimethoxysilane, gamma-Aminopropyltriethoxysilane and gamma-Aminopropyltrimethoxysilane.
  • softeners may be included in the coupler compound. Softeners improve the hand of the labric by offsetting the harshness of the microsphere beads and pigment matrix film. Examples of softeners include low, medium and high density polyethylene, polydimethylsiloxane mixture, and reactive and elastomeric silicone, as well as emulsions of mineral 0: 1.
  • dispersants may also be included in the coupler compound.
  • dispersants include, but are not limited to, tymol dispersant, acrylic polymers, and naptholene sulphanates.
  • Thickeners may be included in the coupler compound. Examples of thickeners include, but are not limited to, acrylic polymers, natural gums, hydrocarbons, alginates, and white spirit. Additives to encapsulate or "liquify'Vdisperse non-volatiles such as Polyvinyl Chloride (PVC), acrylics, methacrylics, etc. are commonly referred to as plastisizers.
  • Plastisizers may include, for example, phthalates, adipates, phosphate esters, diectylphthalate, tricresyl phosphate or cresyl diplenyl phosphate.
  • Reducers/detactifiers are often used to reduce viscosity.
  • Antiwiks, emulsifiers and humectants may be added to improve print and flow qualities.
  • Fixers may be included in the coupler compound. Examples of fixers include, but are not limited to, methylated melamine formaldehyde, and DMDHEU, trimethoxymethylmelamine (TMMM) and hexamethoxymethylmelamine (HMMM).
  • an adhesion promoter is coated onto the individual corrosion protected retroreflective microsphere beads prior to the inclusion of the retroreflective beads into the coupler compound to form the reflective composition of the present invention.
  • the adhesion promoter constitutes between approximately .05%) and 1%> of the bead weight, depending upon the surface area of the retroreflective microsphere bead. In an alternative embodiment, the adhesion promoter constitutes between approximately .05%) and 1% of the weight of the reflective composition.
  • the relative amounts of the ingredients of the retroreflective composition of the present invention will, of course, vary depending upon the particular ingredients employed, the type of substrate, the substrates intended use, as well as such factors as the specific size and quantity of the retroreflective microsphere beads.
  • the retroreflective composition 100 having the volume ratio identified above.
  • Any other volatile and/or non-volatile components of the composition 100 relate solely to the printing ability and quality of the composition 100 when applied to a particular substrate 106.
  • the volume ratio described according to the present invention relates solely to the volume of matrix material 102, retroreflective microsphere beads 104 and pigment particles 1 10.
  • One volume ratio of significance to the present invention is the ratio of the volume of matrix material 102 to the volume of retroreflective microsphere beads 108 plus pigment particles 1 10. This ratio, referred to herein as the Matrix-to-Bead+Pigment Volume
  • MBPVC MBP Concentration
  • Figure 2 is a graph showing the relationship of the volume percent of matrix material 102 and the volume percent of retroreflective microsphere beads 104 plus pigment particles 110 for a preferred MBPVC ratio range of 0% to 10,000%).
  • the horizontal axis represents the volume percent of non- volatile retroreflective microsphere beads 104 plus pigment particles 110 while the vertical axis represents the volume percent non-volatile matrix material 102.
  • the sum of the matrix material 102, the pigment particles 1 10, the microsphere beads 104, the volatile constituent and any optional ingredients equal 100% of the retroreflective composition 100.
  • FIG. 2 There are three main regions illustrated in Figure 2, each representing a different general category of retroreflective composition 100 which may be formulated and applied to a substrate 106 to form a coated substrate having characteristics which meet a specific end customer's needs.
  • the illustrated range of the MBPVC ratio results in a coated substrate 106 ranging from those which are highly visible at nighttime (that is, high retroreflectivity) to those which are barely visible at nighttime (that is, low retroreflectivity) but which possess excellent daytime colors and are more likely to be considered to be fashionable.
  • the coated substrates provide for both high visibility at night and a wide spectrum of fashionable colors while ensuring hand comfort, breathability comfort and passing the industry standards, all of which are described below.
  • the regions of the graph 200 are described in detail below.
  • Formulations having a MBPVC ratio in region 202 will produce a reflective composition 100 which can be applied to produce a highly visible product owing to the high volume concentration of retroreflective microsphere beads 104.
  • This high concentration may make a fabric substrate 106 less flexible and stiffer.
  • this concentration may result in difficulty in obtaining bright pigment colors.
  • Retroreflective compositions in this region may be used in the creation of coated substrates for objects for which increasing nighttime visibility is paramount and daytime unnoticability, durability, and hand of the substrate 106 are less important.
  • Formulations having a MBPVC ratio in region 206 will produce a reflective composition 100 which can be applied to produce a highly fashionable but less visible product owing to the lower volume concentration of retroreflective microsphere beads 104.
  • This low concentration improves the substrates daytime unnoticability and allows for the addition of additional matrix material 102 and pigment particles 110 and even reduce the volume of retroreflective microspheres 104. It is noted, however that as the volume of retroreflective microspheres 104 is reduced and more matrix material 102 is added, the MBPVC ratio rapidly increases.
  • Retroreflective compositions 100 in this region may be used in the creation of products for customers who are highly concerned with increasing daytime unnoticability (fashionability) and less concerned with the nighttime visibility of an object.
  • Formulations having a MBPVC ratio in region 204 will produce a reflective composition 100 which can be applied to produce a coated substrate which provides a preferred tradeoff between the region 202 and 206.
  • the result in region 204 is a coated substrate in which matrix material 102, pigment particles 1 10, retroreflective microspheres 104 or other constituents may be added to the retroreflective composition.
  • the coated substrate may be designed to be more fashionable (more pigment) or more reflective at night depending on the customers desires.
  • This region of ratios is to be used when customers are very concerned with increasing daytime unnoticability (fashionability) and equally concerned with the nighttime visibility of an object.
  • percent solid lines 208 and 210 are provided.
  • the percent solid lines illustrate that the relative concentration of volatile constituents is relative to the proximity of the concentration point to the origin of the graph 200.
  • line 210 represents the 100%) (non-volatile) solids line or the MBPVC ratios where 100% of the coupler compound volume is solid and there is no volatile portion to the composition.
  • 100%o non-volatile compositions are thermoplastic (PVC dispersions), thermoset, ultraviolet, electronic beam. It should be understood that the optimal MBPVC ratio is not restricted by region, but by the specific gravities of matrix/pigments available in the industry and the desired substrate being coated. Hence, on optimal MBPVC ratio for a plastisol formulation may be, for example, in the range of 300%).
  • Line 208 represents the 40%) volatility line or the 60%) non-volatile line (solids). At any point along this line there is 100% volume; 40% volatile, 60% non-volatile which consists of the sum of the matrix material, the pigment particles, and the retroreflective microsphere beads.
  • 40% volatile, 60% non-volatile which consists of the sum of the matrix material, the pigment particles, and the retroreflective microsphere beads.
  • the MBPVC ratio is approximately 150%). This ratio results in a thin layer of matrix material 102 that does not interfere with a source of light reaching the back surface of the microsphere beads 104 upon which the retroreflective means 108 is coated. When the layer of matrix material 102 through which light must pass is thick, the light beam will be refracted, thus preventing an adequate retroreflection of the light.
  • this preferred embodiment supplies a sufficient amount of matrix material 102 to insure the retroreflective microsphere beads 104 are secured firmly to the substrate
  • the substrate 106 is a fabric
  • this preferred range of MBPVC ratio also results in a coated substrate satisfying industry crock, laundering and crock reflectivity loss standards. Also, this prevents the creation of additional extraneous matrix material 102 which results in poor tactile qualities of the substrate, and provides a vehicle in which the pigment particles 1 10 may be uniformly embedded in the matrix material 102 to provide sufficient pigment particle coverage over the entire surface area of the desired portion of the substrate 106.
  • the entire surface area of a fabric may be treated with the retroreflective composition of the present invention to project a full reflective silhouette and still maintain its original daytime unnoticability and tactile qualities.
  • the MBPVC ratio is approximately between 0%o and 400%>, and more preferably approximately between 0% and 200% and still more preferably approximately between 100% and 200%). In another preferred embodiment, when the retroreflective composition does not include a volatile constituent, the MBPVC ratio is approximately between 0% and 2000%o and more preferably, approximately between 100%) and 1000%), and still more preferably, approximately between 200% and 800%>. It is understood that other ratios may be preferred depending upon which of the above and other characteristics are desired.
  • Figure 3 is a table illustrating the results of experiments which were performed on a Ripstop Nylon and a 100% Cotton T-shirt substrates coated with the retroreflective composition 100 of the present invention.
  • the test results shown in the Table depict the dry and wet crock tests which are provided by the industry. The tests were conducted on a scale of 1 to 5.
  • Figures 4-8 are photographs of the coated substrate associated with each of the MBPVC ratios tabularized in Figure 3. Five experiments were performed. Experiments 1-4 contained a volatile constituent and were applied to a lightweight Ripstop nylon. Holding both application method and viscosity constant, one sees a correlation between the MBPVC ratio, reflectivity (Ra) and the density of reflective beads per square millimeter (SQMM). As the MBPVC ratio increases, there is a decrease in the density of reflective beads/SQMM which corresponds to a decreased reflectivity reading on the fabric.
  • the density is so high (409/SQMM) that the microsphere beads form multi-tiered layers which result in microsphere beads laying on top of other microsphere beads.
  • MBPVC ratio the higher the density of reflective microspheres/SQMM, the greater the surface area for diffuse daylight to make contact with a reflective microsphere bead as opposed to a similar surface area covered by only pigment. This results in higher reflectivity and decreased daytime unnoticability.
  • Optimizing both reflectivity and daytime unnoticability is possible by creating a weighted scale and testing end use products formulated at various MBPVC ratios. Optimal MBPVC ratio will depend on end use product (customer specifications), application method, matrix selection for application, rheology and substrate. For lightweight Ripstop nylons used for functional outdoor activities, a MBPVC ratio of between 130% - 180% meets both customer daytime unnoticability/durability needs as providing enhanced visibility at night. For fashion purposes only, the MBPVC ratio may soar as high as 99,000%), allowing for only minute retroreflection and mostly daytime unnoticability.
  • Experiment 5 was formulated as 100%) solids and was applied to a cotton T-shirt.
  • Figure 8 portrays the difference between the substrate in 1 -4 (woven) versus a knit in experiment s.
  • the reflective coating needs to stretch more on a knit than a woven.
  • the MBPVC ratio may range anywhere from 100% to 1,000%; preferably between 200%) and 800%> to achieve both suitable reflectivity and customer daytime unnoticability/durability.
  • a MBPVC ratio over 2,000%) results in a more fashionable and less functional T-shirt product.
  • Conspicuity refers to the characteristic of an object that determines the likelihood that the object will come to the attention of the observer. Since one's eyes continuously detect millions of objects, conspicuity implies that the mind has registered the importance of this object and begun to consider it.
  • Recognizability refers to the characteristic of an object that determines the likelihood that the object will be recognized by an observer. Upon recognition of an object, the motorist can determine whether it is worthy of potential action by identifying whether the object is a sign, another automobile, a person, an animal, or something else. Localizability refers to the characteristic of an object that determines the likelihood an observer will be able to determine the object's location. Localizability enables a driver to judge the size and position of the object to determine whether the object appears capable of intersecting with the vehicle's path (by mentally judging the closing rate, necessary deceleration, and lateral offset). These criteria are based on the physiological visual responses that a driver requires to perceive and respond to a potential hazard.
  • a reflectivity number referred to as the Reflectivity per End Use Product (Reup) was measured. This number represents the retroreflectivity of a specific end use product, such as a garment. Reup is a calculated by multiplying the average retroreflectivity reading of the reflective material (Ra) by the number of square meters of reflective fabric used on the garment; the units of this number are candelas per lux per end use product. To calculate the reflectivity per garment (candelas per lux per garment), the retroreflectivity per area of the fabric is measured per ASTM standard E810 using a reflectometer (reflectivity hereinafter referred to as Ra; units are in Candelas per Lux per square meter).
  • Ra reflectometer
  • Reflectivity per area is a ratio that represents the degree of retroreflectivity of a substrate upon which retroreflective microsphere beads are deposited.
  • the Ra is dependent upon the angle between the light source, the substrate and the observer.
  • a reflective fabric surround a substantial portion of the garment in such a manner to present a visible readily recognizable covered object, such as a human form.
  • the number of retroreflective microsphere beads per unit of area that are deposited on the substrate to yield daytime unnoticability and nighttime retroreflectivity of the resulting substrate is referred to as the semi-saturated microspheric density.
  • the highest density of microsphere beads that can be attained in a given one dimensional space is 90.69%).
  • the actual number of microsphere beads 104 in a one dimensional space depends on the diameter of the microsphere beads.
  • the optimum microsphere size to achieve the highest retroreflectivity and daytime unnoticability, and for obtaining optimum coatability, dispersion and suspension in the matrix material is approximately 50 microns in diameter. A micron is a thousandth of a millimeter. At 50 microns, the maximum number of microspheres which may be deposited in a matrix material layer is approximately 46,000 microsphere beads per square centimeter or 460 microsphere beads per square millimeter.
  • the microsphere beads may be deposited in either a multi-tier or monolayer.
  • the microsphere beads are typically deposited in a randomly oriented manner. That is, when retroreflective microsphere beads are applied to a substrate, they randomly orient themselves with respect to the plane of its surface, providing for retroreflection at a wider range of angles. The greater the orientation of each reflective bead, the higher the Ra and less volume is required to obtain the same Ra.
  • Figure 9 is an enlarged cross sectional view of a fabric substrate treated with a mono-layer of the retroreflective composition 100 of the present invention, while Figure 10 is an enlarged cross sectional view of the same fabric treated with the composition of the present invention in which multiple layers of microsphere beads have been applied.
  • Figure 11 is a scanning electron microscope photograph of a fabric illustrated in Figure 10.
  • the pigment particles 110 provide continuous coverage throughout the entire surface of the fabric 300 regardless of the indentations and ridges inherent in the fabric substrate 300 due to its construction.
  • the retroreflective composition 100 may be applied to such a fabric over its entire surface or in a pattern form. By applying the retroreflective composition 100 to a continuous bolt of fabric 300, the fabric 300 can then be cut and sewn into a garment.
  • Articles of clothing which may be coated with the retroreflective composition 100 of the present invention include, but are not limited to, socks, sneakers, shoes, shoelaces, boots, pants, shorts, shirts, coats, hats, belts, scarves, gloves, packs, bags, daypacks, animal outfits, safety gear, etc.
  • the fabric on which the retroreflective composition 100 is applied includes, but is not limited to, nylon, cotton, polyester, lycra, fleece, non-wovens, leather, and synthetics.
  • multi-tiered microsphere beads 104 refers to the structure of microsphere beads having more than one monolayer of microspheres in portions of the substrate. Specifically, when a substantial number of microsphere beads are deposited onto a square millimeter of the substrate, a portion of the microsphere beads tend to gather on the upper surfaces of the lower-lodged microsphere beads. The beads subsequently group together to form multiple layers, and are referred to as multi-tiered microsphere beads. As shown in Figure 10, a fabric 1000 does not provide a flat surface by which a light ray will be reflected, but rather has indentations 1002 and ridges 1004 due to its construction. Fabric 1000 may be, for example, a weave or knit.
  • microsphere beads are lodged into the arbitrarily-arranged recesses of the fabric forming a multi-tiered structure.
  • a monolayer is created when the microsphere beads are deposited and fail to gather on both the upper and lower surfaces of the substrate. Rather, the beads primarily gather on one surface.
  • FIG. 1 An exemplary coated fabric substrate with a retroreflective composition that when applied to the fabric results in a multi-tiered structure of microsphere beads is shown in Figure 1 1.
  • Figure 1 An exemplary coated fabric substrate with a retroreflective composition that when applied to the fabric results in a multi-tiered structure of microsphere beads is shown in Figure 1 1.
  • a discussion of the features and advantages of such an embodiment of the present invention is further described in commonly owned co-pending U.S. Patent Application Serial No. 08/346,887, herein incorporated by reference in its entirety.
  • the present invention will be further described with the following non-limiting example shown in Figure 12.
  • a slurry was prepared from the ingredients shown in Figure 12. The first seven identified ingredients were mixed together for 15 minutes with a high speed mixing blade. After mixing to homogeneity, retroreflective microsphere beads were added and mixed for 5 minutes until uniformly blended.
  • the retroreflective composition is then applied as a single component onto a fabric using a rotary screen printer directly against the fabric resulting in a retroreflective fabric coated with between 20 to 2,000 randomly oriented microsphere beads per square millimeter fabric.
  • the composition was dried by forced air heated between 100°F to 250°F for approximately 1-3 minutes and then cured at approximately 350°F for 2 minutes.
  • the volume ratio of the matrix material to the retroreflective microsphere beads plus pigment is approximately 200%).
  • compositions of the present invention can be applied to fabric using conventional textile printing and finishing equipment.
  • Typical methods for flexible substrates include rotary screen printing, rotogravure cylinder, blade over roll, flex-o-graphic, bathing, spraying, and flat bed printing.
  • the typical commercial finishes such as softeners, waterproofing, and water repellency may be applied over the printed composition of the present invention without affecting the retroreflective composition's daytime unnoticability or nighttime reflectivity.
  • spraying and painting and roller coating are preferred.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Decoration Of Textiles (AREA)

Abstract

Une composition réfléchissante de la présente invention comprend une matière matricielle non volatile, un constituant volatile facultatif ainsi qu'une pluralité de billes microsphériques réfléchissantes et un pigment, le rapport entre le volume de la matière matricielle et le volume des billes microsphériques réfléchissantes plus le pigment étant compris dans la plage allant de 0 % à 10000 % et convient parfaitement à une utilisation sur des tissus.
PCT/US1998/014585 1997-07-14 1998-07-14 Composition reflechissante WO1999003007A1 (fr)

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US08/892,009 1997-07-14

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US6931665B2 (en) 2001-07-30 2005-08-23 3M Innovative Properties Company Vapor permeable retroreflective garment
DE102015106819A1 (de) * 2015-03-30 2016-10-06 Fritz Lange Gmbh Schutzlackierung mit Antiaufklebereffekt sowie Verfahren zum Aufbringen einer Schutzlackierung
WO2018178974A1 (fr) 2017-03-28 2018-10-04 Erez Thermoplastic Products - Agriculture Cooperative Association Ltd. Tissus rétro-réfléchissants

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US3420597A (en) * 1964-04-13 1969-01-07 Minnesota Mining & Mfg Retroreflective structure and method of making same
US4263345A (en) * 1979-11-16 1981-04-21 Minnesota Mining And Manufacturing Company Coating composition for forming retroreflective treatments on fabrics
EP0305074A2 (fr) * 1987-08-25 1989-03-01 Minnesota Mining And Manufacturing Company Revêtement rétroréfléchissant et composition pour l'obtenir
EP0389114A1 (fr) * 1989-03-24 1990-09-26 Minnesota Mining And Manufacturing Company Pellicule transférable rétroréfléchissante de faible épaisseur et son procédé de fabrication
WO1996017264A1 (fr) * 1994-11-30 1996-06-06 Reflective Technologies, Inc. Composition reflechissante
WO1997010522A1 (fr) * 1995-09-15 1997-03-20 Minnesota Mining And Manufacturing Company Feuille de transfert reflechissante et motif decoratif

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420597A (en) * 1964-04-13 1969-01-07 Minnesota Mining & Mfg Retroreflective structure and method of making same
US4263345A (en) * 1979-11-16 1981-04-21 Minnesota Mining And Manufacturing Company Coating composition for forming retroreflective treatments on fabrics
EP0305074A2 (fr) * 1987-08-25 1989-03-01 Minnesota Mining And Manufacturing Company Revêtement rétroréfléchissant et composition pour l'obtenir
EP0389114A1 (fr) * 1989-03-24 1990-09-26 Minnesota Mining And Manufacturing Company Pellicule transférable rétroréfléchissante de faible épaisseur et son procédé de fabrication
WO1996017264A1 (fr) * 1994-11-30 1996-06-06 Reflective Technologies, Inc. Composition reflechissante
WO1997010522A1 (fr) * 1995-09-15 1997-03-20 Minnesota Mining And Manufacturing Company Feuille de transfert reflechissante et motif decoratif

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6931665B2 (en) 2001-07-30 2005-08-23 3M Innovative Properties Company Vapor permeable retroreflective garment
US7107622B2 (en) 2001-07-30 2006-09-19 3M Innovative Properties Company Vapor permeable retroreflective garment
US7600269B2 (en) 2001-07-30 2009-10-13 3M Innovative Properties Company Vapor permeable retroreflective garment
US8015620B2 (en) 2001-07-30 2011-09-13 3M Innovative Properties Company Vapor permeable retroreflective garment
US8256025B2 (en) 2001-07-30 2012-09-04 3M Innovative Properties Company Vapor permeable retroreflective garment
DE102015106819A1 (de) * 2015-03-30 2016-10-06 Fritz Lange Gmbh Schutzlackierung mit Antiaufklebereffekt sowie Verfahren zum Aufbringen einer Schutzlackierung
WO2018178974A1 (fr) 2017-03-28 2018-10-04 Erez Thermoplastic Products - Agriculture Cooperative Association Ltd. Tissus rétro-réfléchissants
US11602187B2 (en) 2017-03-28 2023-03-14 Erez Thermoplastic Products—Agriculture Cooperative Association Ltd. Retroreflecting fabrics

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