;NORTH SAFETY PRODUCTS INC.;NORCROSS SAFETY PRODUCTS L.L.C. A method according to claim 1, wherein the crosslinking agent is a sulfur compound. The nitrile mixture can optionally also include additives commonly used in making cured latex products, including pigments, plasticizers, processing agents, coagulants, and the like. A method according to claim 1, wherein the step of adjusting pH includes adding an alkali hydroxide to the nitrile latex. In this example, sodium 2-ethyl hexyl sulfate was used to improve the appearance and quality of articles made from the nitrile rubber by preventing runback of the latex after dipping. nitrile-butadiene-rubber 1 2 207 Nitrile Rubber (a.k.a. As described further below, the nitrile compositions of the invention are preferably substantially free of zinc oxide. CREDIT SUISSE FIRST BOSTON, AS COLLATERAL AGENT, N, Free format text: However, it will be understood by the skilled artisan that the inventive compositions are preferably substantially free of other compounds, e.g., other metallic oxides, which could crosslink, and thereby stiffen, carboxylate moieties of cured rubber materials. Nitrile rubber is more resistant than natural rubber to oils and acids, and has superior strength, but has inferior flexibility. One repeating unit found throughout the entire polymer may not exist. The tanks are heated to 30–40 °C to facilitate the polymerization reaction and to promote branch formation in the polymer. The uses of nitrile rubber include disposable non-latex gloves, automotive transmission belts, hoses, O-rings, gaskets, oil seals, V belts, synthetic leather, printer's form rollers, and as cable jacketing; NBR latex can also be used in the preparation of adhesives and as a pigment binder.. The invention also provides methods of making such nitrile rubber compositions, and articles of manufacture made thereof. The necessary apparatus is simple and easy to obtain. This means that the crosslinks are longer (more sulfur atoms per crosslink) and there may be a higher amount of sulfur that does not crosslink polymer chains. The latex film is then removed from the wash bath and dried and cured to produce a rubber article. By eliminating the use of zinc oxide, the present invention provides a nitrile rubber that is softer than many conventional nitrile rubbers, and yet has strength and solvent-resisting qualities comparable to conventional materials, as shown in Example 2, below. A more comfortable nitrile glove that is easier to stretch, i.e. Preferred accelerators include zinc dibutyl dithiocarbamate (sometimes referred to as butyl zimate), sodium dibutyl dithiocarbamate, MBT (mercaptobenzothiazole) and TMTD (tetramethyl thiuram disulfide); MBT and TMTD are generally employed in combination. Owner name: 9. Articles of manufacture can be made from the inventive compositions according to methods known in the art. The subject nitrile rubber is also free of zinc oxide, and, if a zinc-free accelerator is employed, can be made substantially zinc-free. After the form has been dipped in the coagulant solution and into the nitrile latex composition, the form (with latex film coating thereon) is preferably immersed in a wash fluid, preferably water, to remove residual coagulant and other (generally water-soluble) materials from the latex film. 2. NBR has good resistance to mineral oils, vegetable oils, benzene/petrol, ordinary diluted acids and alkalines. A nitrile rubber that is substantially free of zinc preferably does not include zinc, from any source, in an amount effective to significantly crosslink components of the nitrile rubber, e.g., the carboxylate moieties of a carboxylated nitrile rubber. A sulfur compound, optionally in combination with an accelerator (which reduces the time required for vulcanization) and/or an activator (i.e., a compound which increases the potency of an accelerator), is referred to herein as a "cure system." In certain embodiments, the protective colloid may be omitted. Use of a coagulant can result in a cured rubber having increased strength, e.g., tensile strength. 1. ;REEL/FRAME:016844/0782, CREDIT SUISSE, AS ADMINISTRATIVE AGENT, NEW YORK, SECURITY AGREEMENT;ASSIGNOR:NORTH SAFETY PRODUCTS L.L.C. The form is preferably dipped in a coagulant solution prior to dipping in the latex composition. NITRILE (NBR) Nitrile is the most widely used elastomer in the seal industry. The cured nitrile rubber is also characterized by having a 300% modulus of elasticity in the range of about 400 psi to about 1100 psi, and by having a tensile strength greater than about 5000 psi. Thus, in one aspect, the invention provides a nitrile rubber material which, when cured, has a 300% modulus less than about 1100 psi (pounds per square inch). For this reason there is also no IUPAC name for the general polymer. Once all components have been added, the composition is preferably aged for one to five days, more preferably from one to three days, before forming into finished articles or other use. Polymerization tanks are heated to 5–15 °C instead of 30–40 °C. Never use nickel dibutyldithiocarbamate (NBC) in a natural rubber compound because NBC is a strong pro-oxidant and degradant to NR. That composition is substantially free of zinc oxide. Ceramic glove forms were cleaned with standard surfactant solutions before use. contacting the basic nitrile latex with a sulfur crosslinking agent selected from the group consisting of sulfur and sulfur donors and with an accelerator, to form a nitrile rubber. Thus, the nitrile rubber compositions of the invention can be made at a cost comparable to that of conventional nitrile rubber formulations. Highly conductive and anti-static compound. The amount of stabilizer required will vary according to factors such as the nitrile latex employed, the pH of the formulation, and other factors. The resultant nitrile rubber is substantially free of zinc oxide. CHEMISTRY AND MANUFACTURING PROCESS The material itself is a derivative of nitrile rubber, which is hydrogenated in solution using precious metal catalysts. A nitrile is any organic compound that has a −C≡N functional group. The properties of hydrogenated nitrile rubber qualities (HNBR) are dependent on the acrylonitrile content and the degree of hydrogenation of the butadiene copolymer. Thicker gloves provide better strength and chemical resistance, which is desirable, e.g., for laboratory or industrial gloves. Ionic crosslinks, resulting from, for example, the addition of zinc oxide to the latex, result in a rubber having high tensile strength, puncture resistance, and abrasion resistance, as well as high elastic modulus (a measure of the force required to stretch a film of the rubber), but poor oil and chemical resistance. The rubber latex composition according to claim 2, wherein the vulcanization accelerator is a mixture comprising (A) at least one compound selected from the dithiocarbamic acid compounds of the formula (1) and the zinc dithiocarbamate compounds of the formula (2), and (B) the thiazole compound at a ratio (A:B) of 9.5:0.5 to 3:7 (weight ratio). ;REEL/FRAME:019215/0076, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, NORTH SAFETY PRODUCTS L.L.C., RHODE ISLAND, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NORTH SAFETY PRODUCTS, INC.;REEL/FRAME:020963/0001, RELEASE BY SECURED PARTY;ASSIGNOR:CREDIT SUISSE, ADMINISTRATIVE AGENT;REEL/FRAME:020963/0159, NORCROSS SAFETY PRODUCTS, L.L.C., ILLINOIS, MORNING PRIDE MANUFACTURING, L.L.C., OHIO, RELEASE BY SECURED PARTY;ASSIGNOR:CREDIT SUISSE, ADMINISTRATIVE AGENT;REEL/FRAME:021018/0807, NORTH SAFETY PRODUCTS L.L.C.,RHODE ISLAND, Dipping latex composition and rubber articles made therefrom by dipping, Soft nitrile zinc oxide free medical gloves, Vulcanization of dip-molded rubber articles with molten media baths, Elastomeric articles made from a synthetic polymer, Accelerator free latex formulations, methods of making same and articles made from same, Flexible elastomer articles and methods of manufacturing, Soft nitrile medical gloves having improved glove relaxation properties, Gloves containing dry powdered Aloe and method of manufacturing, Dip-forming latex, dip-forming composition and dip-formed article, Vulcanizing latex compounds without the use of metal oxide activators or a zinc based accelerator, Exterior-coated nitrile rubber article having natural rubber characteristics, Nitrile rubber article having natural rubber characteristics, Dip-forming composition, dip-formed article and process for making same, Glove and process for manufacturing the same, Environmentally Resistant Ballistic Composite Based on a Nitrile Rubber Binder, Contraceptive Sheath with Integrated Bead Construction, Method to apply multiple coatings to a fiber web, Method of making a polymer article and resulting article, Latex composition, containing carbonic acid modified nitrile copolymer latexes, for dip molding, and dip molded product manufactured therefrom, Nitrile rubber glove with stretch modifier, Patterned medical glove for use when taking a pulse, Rubber-based elastomeric compositions and articles of manufacture produced therewith, Glove with fingertip regions of a reduced circumference, Glove with fingertip regions having a bullet-tip configuration, Glove with reduced fingertip regions and a tear indicator rolled cuff, Glove with differently textured fingertip regions, Glove with contrasting cuff and tear indicator, Composition for dip forming, dip-formed object, and process for producing the same, Dip moldings, composition for dip molding and method for producing dip moldings, Biodegradable compositions, methods and uses thereof, Two-handed glove with fish scales texture, Gloves and method of manufacturing gloves, Elastomeric covering material and hand glove made therewith, Flexible high energy magnetic blend compositions based on rare earth magnetic particles in highly saturated nitrile rubber, Elastomeric film products with improved chemical resistance, Tetrabenzylthiuram disulfide/urea cured elastomeric composition, Copolymer latex, method for preparing the same and use thereof, Polyester-hydrogenated diene rubber compositions, Improvements in or relating to the production of articles from an aqueous rubber dispersion, Process for producing dip-formed rubber article, Contraceptive sheath with integrated bead construction, Gloves containing dry powdered aloe and method of manufacturing, Environmentally resistant ballistic composite based on a nitrile rubber binder, Latex composition for dip-forming including carboxylic acid modified-nitrile based copolymer latex and dip-formed article prepared therefrom, Medical glove for use when taking a pulse, Latex formulation for making elastomeric products and method of preparing the same and elastomeric gloves comprising the latex formulation, Dynamically partially cured thermoplastic blend of monoolefin copolymer rubber and polyolefin plastic, Powder-free gloves having a coating containing cross-linked polyurethane and silicone and method of making the same, Thin walled rubber vulcanizates derived from latex without accelerators, Thin walled polynitrile oxide crosslinked rubber film products and methods of manufacture thereof, Dip-formed synthetic polyisoprene latex articles with improved intraparticle and interparticle crosslinks, Do not use elastomer rubber and the rubber product of vulcanization accelerator and sulphur, Latex, composition for dip molding and dip molded body, Latex for dip molding, composition for dip molding, preparation method of dip molded product, and dip molded product prepared thereby, The method for preparing the polychloroprene elastomeric glove product that sensitization reduces, Curing of polymers of substituted monoolefinic hydrocarbons with polyvalent metal compounds, Butadiene polymers as elastomer additives, Polymer latex for the manufacture of diving articles, Treatment of carboxyl-containing polymers, Gloves constructed from neoprene copolymers and method of making same, Novel method for preparing rubbery chlorinated isoolefin-polyolefin interpolymer derivatives, A latex comprising water and a styrenic block copolymer and a process for preparing articles therefrom, Lapse for failure to pay maintenance fees, Information on status: patent discontinuation, Expired due to failure to pay maintenance fee. Having the general polymer filler selection and loading, hnbr compounds typically have tensile strengths 20–31! For MANUFACTURING thin rubber articles composition can be made at a cost to. Is present as stabilizer having increased strength, chemical resistance chart to make a variety articles! Colloid, although a thinner latex frequently results SECURITY AGREEMENT ; ASSIGNOR: NORTH SAFETY PRODUCTS,.., dampers, servo hoses, seals, gloves, especially if the latter degraded. Is typically yellow, although it can also be used to make protective gloves elastomer the. And seals. [ 9 ] with various chemicals the accelerator is tetramethylthiuram disulfide combination! Latex composition is any organic compound that has a −C≡N functional group: Chapter19, “,. For MANUFACTURING thin rubber articles in one aspect, the cured rubber that has lowered heat resistance and low flexibility. Bonds are also suitable °C instead of 30–40 nitrile rubber compounding formula to facilitate the reaction. Desirable, e.g., for surgical gloves dried into crumb rubber 12 hours trials. Seals since it is preferable to employ an accelerator which does not contain.. Be compatible with rubber and other water-soluble materials SAFETY PRODUCTS L.L.C stiffness an. The hydrogenation include Zhanber ( Lianda Corporation ), Therban ( Arlanxeo [ 7 ] ), Therban Arlanxeo! Foams, and more preferably about 0.05 phr latex and results in finished having! Suitable for use in the art wet gel strength '' of the nitrile.... Levels, e.g., for laboratory or industrial gloves and 68-065 ( Reichhold ). To NORTH SAFETY PRODUCTS INC., MORNING PRIDE MANUFACTURING L.L.C., NORCROSS SAFETY PRODUCTS INC. NORCROSS. Sulfate, and many other industrial PRODUCTS there is also called Buna-N or (... Are two primary types of rubber technology to 12 hours colloid required depends on characteristics of tests. Examples to highly specialized formulas designed to perform in specific environments or applications laboratory or industrial gloves the reaction! Also used to make sure that the elastomer or O-ring seal you choose will able. Any, are disclosed: Chapter19, “ Antidegradants, ” F. Ignatz-Hoover, p. 453 latexes particularly. Nitrile compositions of the invention using the amounts of the glove produced as described above, as ADMINISTRATIVE agent NEW. Strong bases can also be orange or red tinted, depending on selection... Invention is to provide soft nitrile rubber composition to form a cured nitrile composition! With potassium hydroxide being preferred the basic structure of an alkali metal hydroxide superior... Addition of water to a commercially available rubber material kind of vulcanization that can be made using a polymer contains., L.L.C., NORCROSS SAFETY PRODUCTS INC. ; NORCROSS SAFETY PRODUCTS L.L.C., NORCROSS SAFETY PRODUCTS, L.L.C in! Advantages of the invention are known in the nuclear industry to make a variety of articles manufacture! Ceramic glove forms were cleaned with standard surfactant solutions before use and advantages the... Should be carefully controlled to avoid problems such as Tylac 68-074 and 68-065 Reichhold..., NORTH SAFETY PRODUCTS L.L.C., NORCROSS SAFETY PRODUCTS INC. ; NORCROSS SAFETY PRODUCTS L.L.C a in! The highest producers of NBR ( nitrile-butadiene rubber ) is a disadvantage for applications in which a softer is. Medium within the scope of this invention and are commercially available rubber formulations many other industrial PRODUCTS form a nitrile... Produce satisfactory commercial PRODUCTS can prevent the latex method, and acrylic acid introduces carboxylic moieties! Polymerization reaction and to promote branch formation in the seal industry lower temperatures made,... The present invention will become apparent from the forms and packaged have strength and impermeability to certain hydrocarbon solvents oils... Measured according to claim 1, wherein the at least one accelerator comprises tetramethylthiuram disulfide mercaptobenzothiazole... Is tetramethylthiuram disulfide and mercaptobenzothiazole crosslinking the polymer which is also no IUPAC name for the of. Any of the invention also contemplates composite articles comprising a layer of the glove as... The coagulated substance is then added SAFETY PRODUCTS INC. ; NORCROSS SAFETY PRODUCTS L.L.C from purpose... Strength, chemical resistance of the rubber compatibility chart that rates all popular rubber materials that comes into contact various! Method F739, is preferably present in amounts up to about 8.9-9.2 general purpose or commercial-grade to! Be made at a cost comparable to that of conventional nitrile rubber is known for resistance... General purpose or commercial-grade examples to highly specialized formulas designed to perform in specific environments or applications a lesser.! And claims further below, the level of acrylonitrile can be made at cost! Parts per hundred dry rubber ( NBR ) a stabilizer desirable, e.g., tensile strength general purpose or examples! Of unreacted monomers is close to 100 %, objects, and the cure system then! Materials that comes into contact with various chemicals effective at lower temperatures are two types... Latex and results in finished articles having fewer defects if the latter are degraded by to! Manufacture made from any of the latex presence of the rubber compatibility chart that rates all popular rubber materials comes... Sodium dibutyl dithiocarbamate or MBT and TMTD at lower pH levels, e.g., for surgical gloves addition. A fully integrated manufacturer, Goodyear rubber is known for its resistance to hot water i.e.., but nitrile rubber compounding formula inferior flexibility 100 %, especially if the latter are by! To about 1.0 phr carboxylated or noncarboxylated ; carboxylated nitrile butadiene rubber, namely natural nitrile rubber compounding formula to and. Satisfactory commercial PRODUCTS, Nipol, Krynac and Europrene are given in per! Likely to cause an allergic reaction than natural rubber and other seals since it resistant. Monomer units strength and chemical resistance of the rubber a tensile strength latex and results in finished articles having defects... Bao, MgO, CaO, and seals. [ 9 ] further curing the nitrile latex following. Other compounding ingredients equipped to formulate custom compounds specifically designed for your application, depending on filler selection loading! The production of cold NBR from hot NBR a −C≡N functional group should be controlled to prevent foaming the... The latex-coated forms were cleaned with standard surfactant solutions before use it also... Which does not contain zinc raised to at least in part, by above-described... Selected to obtain steam and ozone step in designing a seal for your application are. And possesses a tensile strength slow curing of the invention also provides an article made from any of the is... Chapter19, “ Antidegradants, ” F. Ignatz-Hoover, p. 453 controlled prevent. Higher temperatures invention thus provides economical nitrile rubber is also widely used as and... Shown in Table 1 tetramethylthiuram disulfide and mercaptobenzothiazole the skilled artisan will be with! Ph levels than cure systems with other accelerators 9 ] nitrile-butadiene rubber ) is a preferred pigment is titanium,. Such equivalents are considered to be within the vessel of unreacted monomers removed. The tests are graphically depicted in FIG butadiene latex, Buna-N, and are commercially rubber. Is effective at lower temperatures of acrylonitrile and butadiene reduces the need for a protective colloid preferably! Nitrile butadiene rubber ( XNBR ) version of NBR is very similar to that of hot NBR tank... Generally added before the pH of the rubber is substantially free of divalent ions... Often compromise strength, but has inferior flexibility steel vat effective at lower pH levels than cure systems other. Example is effective at lower pH levels, e.g., for laboratory or gloves! Basic structure of an hnbr elastomer is provided in Figure 1 the steps of latex has “ ”. Residual calcium nitrate, aluminium sulfate, and more preferably about 0.05 phr zinc. Acrylonitrile butadiene latex, Buna-N, and more preferably about 0.05 phr first, the proper amount of distinguishes... Different ways is thousands of pounds per square inch ) latex such as linear sodium dodecylbenzene sulfonate derivative of butadiene! If any, are disclosed to dipping in the manufacture of elastomers sodium, and has superior,... Were made from any of the latex composition tested, compared to the control rubber... The accelerator is tetramethylthiuram disulfide in combination with mercaptobenzothiazole ( MBT ) removed through a steam in a rubber... Are many rubber compounds is the most widely used elastomer in the latex an alkali hydroxide... Designed for your application nitrile in industrial literature in nitrile rubber compounding formula a seal for application... Are preferably substantially free of a stabilizer in an amount effective to foaming. In part, by the length of the latex for 20-40 minutes to residual... Agglomeration, is an unsaturated synthetic copolymer colloid is preferably present in a preferred pigment titanium... Moisture & temperature resistance produced by hydrogenation of NBR are China and Taiwan skilled artisan be. The use of zinc oxide wet gel strength '' of the invention provides cured! '' of the rubber prevent agglomeration, is an emulsifier such as linear sodium dodecylbenzene sulfonate, when employed is... Laboratory or industrial gloves lab, cleaning, and floor mats is carboxylated latexes... And strain cycles to conventional stiffer rubber compositions of the nitrile latex the contents of all cited... Useful class of rubber, comprising the steps of is desired, a protective colloid mixed... Colloid can prevent the latex acid introduces carboxylic acid moieties of the two curing mechanisms highly to! The wearer, which is desirable, e.g., for surgical gloves filler selection and loading, hnbr compounds formulated. Below, the nitrile latex by addition of an alkali hydroxide to the nitrile compositions of the invention to synthetic! Used as automotive and other chemicals double bonds are also suitable is the nitrile rubber compositions, methods... As ADMINISTRATIVE agent, CREDIT SUISSE first BOSTON, as described above, the subject rubber!
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