CUT-RESISTANT FABRIC, ARTICLES
Provided among other things is a cut-resistant article comprising: a cut-resistant synthetic fabric; and adherent to the fabric a layer of polyurethane polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 16, wherein the article has a cut resistance by ISO 13997:1999 of 2 or higher.
The present application relates generally to cut-resistant polymer-coated fabrics that incorporate mineral fibers in the polymer coating.
The current application is a continuation-in-part of U.S. Ser. No. 14/933,122, filed Nov. 5, 2015, and claims benefit of U.S. Ser. No. 62/131,315, filed Mar. 11, 2015, U.S. Ser. No. 62/083,636, filed Nov. 24, 2014, and U.S. Ser. No. 62/075,597, filed Nov. 5, 2014, the contents of each of which are incorporated herein in their entireties.
Henssen et al., U.S. Pat. Publ. 2013/0125283, describes articles having mineral fibers in a polymer coating where the fibers are said to have a range of L/D ratios. The Hessen application however only experimentally illustrates these articles with mineral fibers having an L/D ratio of 25.6. Nothing in Henssen discloses or suggests that using an L/D ratio of 5 to 16 (by the L/D measurement method set forth in Example 1 of Henssen) would have remarkably greater cut resistance than using a similar mineral fiber with L/D ratio of 17.9.
Neither does Henssen disclose or suggest that polyurethane/nitrile coated cut resistant polyamide fabric would have the cut resistance described herein.
SUMMARYProvided in one embodiment is a cut-resistant article comprising: a fabric (including a cut-resistant fabric or a non-cut-resistant fabric); and adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 16, wherein the article has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher. The fabric can be of synthetic, semi-synthetic (e.g., polycotton), or natural fiber. The fabric can be shaped as an article, such as a glove, and as an article can be seamless or seamed.
Provided in a further embodiment is a cut-resistant article comprising: a synthetic cut-resistant fabric (including a semi-synthetic fabric); and adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 16, wherein the article has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher. The fabric can be of synthetic, semi-synthetic, or natural fiber.
Provided in another embodiment is a cut-resistant article comprising: (a) a cut-resistant synthetic fabric that is a 70% or more polyamide; and (b) adherent to the fabric a layer of polymer comprising about 5% or more polyurethane and about 60% or more nitrile in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27, wherein the article has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, 4 or higher, and wherein the polymer is adhered to the fabric by coagulation-mediated dip coating onto the fabric, and subsequent curing.
Provided in a further embodiment is a method of forming a cut-resistant article comprising: (1) applying a coagulant to a fabric; (2) coagulating on the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27; (3) curing the coagulated polymer; and (4) obtaining the article, which has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher.
Provided in a further embodiment is a method of forming a cut-resistant article comprising: (1) applying a coagulant to a cut-resistant synthetic fabric; (2) coagulating on the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27; (3) curing the coagulated polymer; and (4) obtaining the article, which has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher.
Provided in another embodiment is a cut-resistant article comprising: (A) a fabric; and (B) adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27, wherein the article has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher, wherein the article has one or more features indicative of layer of polymer being applied by a process wherein coagulant is applied to the fabric to coagulate a coagulation-sensitive dispersion of polymer to form the layer of polymer.
Provided in another embodiment is a cut-resistant article comprising: (A) a cut-resistant synthetic fabric; and (B) adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27, wherein the article has a cut resistance by ISO 13997:1999 (or EN388) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher, wherein the article has one or more features indicative of layer of polymer being applied by a process wherein coagulant is applied to the cut-resistant synthetic fabric to coagulate a coagulation-sensitive dispersion of polymer to form the layer of polymer.
So that the manner in which the above recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only illustrative embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
To facilitate understanding, identical reference numerals have been used, where possible, to designate comparable elements that are common to the figures. The figures are not drawn to scale and may be simplified for clarity. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
DETAILED DESCRIPTIONThe cut-resistant articles of the invention are formed on fabric supports, such as fabric glove liners. The fabric can be, for example, knitted, woven or non-woven, and/or seamless or cut and sewn. The fabric can comprise for example about 70, 80 or 85% or more cut-resistant yarns (by wt). Cut resistant yarns comprise, for example, ultra high molecular weight polyethylene (UHMWPE), such as DYNEEMA®, TSUNOOGA®, a meta-aramid, such as NOMEX®, or a para-aramid, such as KEVLAR® or TWARON® (meta and para-aramids being cut-resistant polyamides). Elastic yarns, such as LYCRA®, SPANDEX®, or ELASTANE® may be used to impart flexibility. In embodiments, the fabric includes (e.g., about 70, 80 or 85% or more by wt) polycarbonate or glass fibers (including without limitation glass fiber yarn fabric). In embodiments, the fabric comprises about 70, 80 or 85% or more of a polyamide cut-resistant yarn. In embodiments, the fabric is about 98% or more, or about 100% cut-resistant yarn, such as cut-resistant polyamide yarn.
In other embodiments, the fabric is cotton, polycotton, polyester, polypropylene, or the like, or mixtures thereof.
To produce the article, typically the fabric is fitted on a former, namely a solid support shaped to support the contours of the final shape of the article. The fitting can be such that the fabric is stretched somewhat over the final sizing. Typically, the article is dipped into or has applied to it a coagulant composition, such as one containing calcium nitrate, calcium sulfate, acetic acid or another coagulant. Typically, the coagulant composition on the fabric is dried to remove solvent.
Then, the fabric on the former is dipped into, or otherwise has applied to it, an elastomer composition formulated to coagulate on contact with the coagulant. Additional coatings may be applied, with or without intervening coagulant applications. In one embodiment, the first elastomer coating includes dispersed therein the fibers discussed herein. In embodiments, the fiber-containing elastomer is the only elastomer (latex) layer applied.
In embodiments, the elastomer layer is leached, typically in aqueous fluid, prior to heat curing. After heat curing, the elastomer surface can be, in embodiments, chlorinated, followed in embodiments by contacting with a neutralization formulation.
An illustrative manufacturing process is shown in
In embodiments, such as those using a substantially polyamide cut-resistant fabric, the mineral fibers used in the invention have a L/D ratio of between about 8 (8:1) and about 27 (27:1). In embodiments, the mineral fibers used in the invention have a L/D ratio of between about 9 and about 21. In embodiments, the mineral fibers used in the invention have a L/D ratio of between about 8 or 9 and about 16. The L/D ratio is taken based on the mass weighted average value for length, L, and on the mass weighted average value for diameter, D. (Applicant understands that Lapinus Fibres (Netherlands) measures L as the mass weighted average. If that understanding is incorrect, then L is as measured by Lapinus Fibres for fibers of the type described herein.)
In embodiments, the diameter D for the fibers (mass weighted ay.) is from about 5 to about 23 micron, or from about 5 to about 12 or 15 micron. In embodiments, the length, L, for the fibers (mass weighted ay.) is from about 100 to about 210 micron (100×10−6 m to 210×10−6 m), or from about 100 to about 170 micron.
In embodiments, the mineral fibers used in the invention have a hardness of about 4 Mohs or higher. In embodiments, the mineral fibers have a hardness of about 5 Mohs or higher, or about 6 Mohs. The fibers can be, for example, uniformly distributed in the polymer layer.
In embodiments, the fiber content in the elastomer suspension (prior to coagulation and curing) is about 4% to about 18% w/w, such as about 8 to about 16%, or about 8.5% to about 15.5%, or about 10% to about 14%. In embodiments, the fiber content in the elastomer suspension (prior to coagulation and curing) is about 4% to about 10% w/w, such as about 5 to about 7%. In embodiments, the fiber content in the elastomer suspension (prior to coagulation and curing) is about 7% to about 13% w/w, such as about 8 to about 12%.
Illustrative fibers include, from Lapinus Fibres (Netherlands), Rockbrake RB215 (L=150, D=9, L/D=17), Rockforce MS603 (L=125, D=9, L/D=14), and Coatforce CF10 (L=125, D=7, L/D=18), and from NYCO Minerals NYAD MG (L=207, D=23, L/D=9).
In embodiments, the thickness of the polymer coating with mineral fiber is from about 0.07 to about 0.15 mm, or from about 0.5 mm to about 1.4 mm, such as about 0.7 mm to about 1.1 mm. The layer thickness can be measured by microscopic examination of a representative cross-section. The inner surface of the elastomer layer can be expected to include a number of penetrations into the fabric. These penetrations can be ignored, with the thickness being an average of a representative number of locations away from such penetrations.
In embodiments, the thickness of the fabric is from about 0.7 to about 4 mm, or about 0.91 to about 1.05 mm.
The elastomeric layers may be natural rubber latex (including Guayule latex), synthetic rubber latex, or the like, and combinations thereof. The synthetic rubber latex may be selected, for example, from the group comprised of polychloroprene, acrylonitrile butadiene copolymer (NBR or “nitrile”) (such as carboxylated acrylonitrile butadiene copolymer), polyisoprene, polyurethane, styrene-butadiene, butyl, and combinations thereof. Other polymer coating techniques, such as water or solvent-based resin coatings can be used. For example, a polyurethane (such as one having hydrophilic groups) can be applied as a suspension in N-methyl pyrrolidone (NMP), dimethylacetamide (DMAC), or dimethyl sulfoxide (DMSO), with the addition of fiber.
In embodiments, the elastomeric layer with dispersed mineral fiber is about 5% or more polyurethane and about 60% or more nitrile (wt).
The article of the invention has a cut-resistance, measured with a cutting implement addressed to the polymer with dispersed mineral fiber coated side of the article, with the measurement pursuant to International ISO 13997:1999. In embodiments, the cut-resistance is 2.1600 grams or higher. In embodiments, the article has a cut-resistance of 4 or higher. An embodiment with a particularly high cut-resistance of say 9.1600 grams (20 mm) can be directly measured by the standard of International ISO 13997:1999, by adjusting loads as needed and retesting to collect five data points in the 5 to 20 mm cut-through length range. This value was compared with a control reference, without mineral fibers. In embodiments, the cut-resistance of this sample was 300 grams (20 mm). Furthermore, the distance until cut can be normalized to a load of 1000 grams, by fitting the appropriate normalization function to the results at various higher loads, the embodiment with cut-resistance of 9.1600 grams by ISO 13997:1999 is expected to have a cut-resistance of about 191.09 mm (1000 grams).
Articles according to the invention can include glove, clothing for endeavors with a high risk of cutting (such as motorcycle riding), jackets, sweaters, pants, gators, chaps, wrist covers, forearm covers, arm covers, facemasks, balaclavas, and the like. It will be recognized that in some embodiments selected high risk surfaces on the article will be coated with the polymer with dispersed mineral fiber.
All ranges recited herein include ranges therebetween, and can be inclusive or exclusive of the endpoints. Optional included ranges are from integer values therebetween (or inclusive of one original endpoint), at the order of magnitude recited or the next smaller order of magnitude. For example, if the lower range value is 0.2, optional included endpoints can be 0.3, 0.4, . . . 1.1, 1.2, and the like, as well as 1, 2, 3 and the like; if the higher range is 8, optional included endpoints can be 7, 6, and the like, as well as 7.9, 7.8, and the like. One-sided boundaries, such as 3 or more, similarly include consistent boundaries (or ranges) starting at integer values at the recited order of magnitude or one lower. For example, 3 or more includes 4 or more, or 3.1 or more.
In embodiments, the article has one or more features indicative of layer of polymer being applied by a process wherein coagulant is applied to the cut-resistant synthetic fabric to coagulate a coagulation-sensitive dispersion of polymer to form the layer of polymer. Such an indicator can include for example the presence of a detectable coagulating salt used for coagulation in an amount greater than would be expected but for the recited coagulation method. Such an indicator can include for example the lack of “break-through” in an amount that would be expected given the fabric (e.g., material, weave density, or the like) in the absence of applying coagulant to the fabric (which tends to create dams at the fabric interstices, limiting break-through). Break-through is where polymer is formed on the interior of a fabric liner.
Specific embodiments according to the methods of the present invention will now be described in the following examples. The examples are illustrative only, and are not intended to limit the remainder of the disclosure in any way.
EXAMPLE 1Gloves made with 85% polyamide yarn were coated with a blend of polyurethane/nitrile formulation, by dipping the glove into a coagulant. The coagulant is dried and the glove was then dipped into the elastomer formulation. The gloves were vulcanized for around 40 minutes, and 120° C. These gloves were used as control reference (0% fibers). The same process was studied for formulations containing different percentages of mineral fibers (as showed in
The results are shown in
Gloves made with cotton (cut and sewn) were coated with a blend of polyurethane/nitrile formulation, by dipping the glove into a coagulant. The coagulant is dried and the glove was then dipped into the elastomer formulation. The gloves were vulcanized for around 40 minutes, and 120° C. These gloves were used as control reference (0% fibers). The same process was studied for formulations containing different percentages of mineral fibers (as showed in
The results are shown in
The invention can be further described with reference to the following numbered embodiments:
Embodiment 1A cut-resistant article comprising: a fabric; and adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 16, wherein the article has a cut resistance by ISO 13997:1999 (or EN388)(ANSI/ISEA) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher.
Embodiment 2The cut-resistant article of embodiment 1, wherein the particles have average D mass weighted from about 5 to about 23 micron, or another average D recited herein with respect to any embodiment.
Embodiment 3The cut-resistant article of one of embodiments 1 or 2, wherein the particles have average L mass weighted from about 100 to about 210 micron, or another average L recited herein with respect to any embodiment.
Embodiment 4The cut-resistant article of one of embodiments 1-3, wherein the particles have hardness of about 5 Mohs or higher, or another hardness recited herein with respect to any embodiment.
Embodiment 5The cut-resistant article of one of embodiments 1-4, wherein the fabric is a cut-resistant synthetic fabric.
Embodiment 6A cut-resistant article comprising: a cut-resistant synthetic fabric that is a 70% or more polyamide; and adherent to the fabric a layer of polymer comprising about 5% or more polyurethane and about 60% or more nitrile in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27, wherein the article has a cut resistance by ISO 13997:1999 (or EN388)(ANSI/ISEA) of 2 or higher, or 3 or higher, or 4 or higher, and wherein the polymer is adhered to the fabric by coagulation-mediated dip coating onto the fabric, and subsequent curing.
Embodiment 7The cut-resistant article of embodiment 6, wherein the particles have average D mass weighted from about 5 to about 23 micron, or another average D recited herein with respect to any embodiment.
Embodiment 8The cut-resistant article of one of embodiments 6 or 7, wherein the particles have average L mass weighted from about 100 to about 210 micron, or another average L recited herein with respect to any embodiment.
Embodiment 9The cut-resistant article of one of embodiments 6-8, wherein the particles have hardness of about 5 Mohs or higher, or another hardness recited herein with respect to any embodiment.
Embodiment 10A method of forming a cut-resistant article comprising: applying a coagulant to a fabric; coagulating on the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27; curing the coagulated polymer; and obtaining the article, which has a cut resistance by ISO 13997:1999 (or EN388)(ANSI/ISEA) of 2 or higher, or 3 or higher, or 4 or higher.
Embodiment 11The method of embodiment 10, wherein the particles have average D mass weighted from about 5 to about 23 micron, or another average D recited herein with respect to any embodiment.
Embodiment 12The method of one of embodiments 10 or 11, wherein the particles have average L mass weighted from about 100 to about 210 micron, or another average L recited herein with respect to any embodiment.
Embodiment 13The method of one of embodiments 10-12, wherein the particles have hardness of about 5 Mohs or higher, or another hardness recited herein with respect to any embodiment.
Embodiment 14The method of one of embodiments 10-13, wherein the fabric is a cut-resistant synthetic fabric.
Embodiment 15A cut-resistant article comprising: a fabric; and adherent to the fabric a layer of polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27, wherein the article has a cut resistance by ISO 13997:1999 (or EN388)(ANSI/ISEA) of 2 or higher, or 3 or higher, or 4 or higher, or 5 or higher, wherein the article has one or more features indicative of layer of polymer being applied by a process wherein coagulant is applied to the cut-resistant synthetic fabric to coagulate a coagulation-sensitive dispersion of polymer to form the layer of polymer.
Embodiment 16The cut-resistant article of embodiment 15, wherein the particles have average D mass weighted from about 5 to about 23 micron, or another average D recited herein with respect to any embodiment.
Embodiment 17The cut-resistant article of one of embodiments 15 or 16, wherein the particles have average L mass weighted from about 100 to about 210 micron, or another average L recited herein with respect to any embodiment.
Embodiment 18The cut-resistant article of one of embodiments 15-17, wherein the particles have hardness of about 5 Mohs or higher, or another hardness recited herein with respect to any embodiment.
Embodiment 19The method of one of embodiments 15-18, wherein the fabric is a cut-resistant synthetic fabric.
This invention described herein is of a breach or contamination indicating elastomeric article and methods of forming the same. Although some embodiments have been discussed above, other implementations and applications are also within the scope of the following claims. Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the following claims.
Publications and references, including but not limited to patents and patent applications, cited in this specification are herein incorporated by reference in their entirety in the entire portion cited as if each individual publication or reference were specifically and individually indicated to be incorporated by reference herein as being fully set forth. Any patent application to which this application claims priority is also incorporated by reference herein in the manner described above for publications and references.
Claims
1. A cut-resistant article comprising:
- a fabric; and
- adherent to the fabric a layer of polyurethane polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 16,
- wherein the article has a cut resistance by EN388 of 2 or higher.
2. The cut-resistant article of claim 1, wherein the particles have average D mass weighted from about 5 to about 23 micron.
3. The cut-resistant article of claim 2, wherein the particles have average L mass weighted from about 100 to about 210 micron.
4. The cut-resistant article of claim 2, wherein the particles have average L mass weighted from about 100 to about 170 micron.
5. The cut-resistant article of claim 2, wherein the particles have hardness of about 5 Mohs or higher.
6. The cut-resistant article of claim 1, wherein the particles have hardness of about 5 Mohs or higher.
7. The cut-resistant article of claim 1, wherein the fabric is a cut-resistant synthetic fabric.
8. A cut-resistant article comprising:
- a cut-resistant synthetic fabric that is a 70% or more polyamide; and
- adherent to the fabric a layer of polyurethane polymer comprising about 5% or more polyurethane and about 60% or more nitrile in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27,
- wherein the article has a cut resistance by EN388 of 2 or higher, and wherein the polymer is adhered to the fabric by coagulation-mediated dip coating onto the fabric, and subsequent curing.
9. The cut-resistant article of claim 8, wherein the particles have average D mass weighted from about 5 to about 23 micron.
10. The cut-resistant article of claim 9, wherein the particles have average L mass weighted from about 100 to about 210 micron.
11. The cut-resistant article of claim 9, wherein the particles have average L mass weighted from about 100 to about 170 micron.
12. The cut-resistant article of claim 9, wherein the particles have hardness of about 5 Mohs or higher.
13. The cut-resistant article of claim 8, wherein the particles have hardness of about 5 Mohs or higher.
14. A method of forming a cut-resistant article comprising:
- applying a coagulant to a fabric;
- coagulating on the fabric a layer of polyurethane polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27;
- curing the coagulated polymer; and
- obtaining the article, which has a cut resistance by EN388 of 2 or higher.
15. The method of claim 14, wherein the particles have average D mass weighted from about 5 to about 23 micron.
16. The method of claim 14, wherein the particles have average L mass weighted from about 100 to about 210 micron.
17. The method of claim 16, wherein the particles have hardness of about 5 Mohs or higher.
18. The method of claim 14, wherein the fabric is a cut-resistant synthetic fabric.
19. A cut-resistant article comprising:
- a fabric; and
- adherent to the fabric a layer of polyurethane polymer in which is dispersed mineral fibers of hardness about 4 Mohs or higher and having L/D ratio between about 8 and about 27,
- wherein the article has a cut resistance by EN388 of 2 or higher, wherein the article has one or more features indicative of layer of polymer being applied by a process wherein coagulant is applied to the cut-resistant synthetic fabric to coagulate a coagulation-sensitive dispersion of polymer to form the layer of polymer.
20. The cut-resistant article of claim 19, wherein the particles have average D mass weighted from about 5 to about 23 micron.
Type: Application
Filed: Jan 18, 2018
Publication Date: May 24, 2018
Inventors: Maria Ines Quaresma Ribeiro Campos Garcia (Vila Nova de Poiares), Geraldo Alexandre Pimentel de Oliveira (Coimbra), Marco Antonio Francisco Costa (Vila Nova de Poiares), Paulo Alexandre Gonçalves Francisco (Vila Nova de Poiares)
Application Number: 15/874,206