6. ;NORTH SAFETY PRODUCTS INC.;NORCROSS SAFETY PRODUCTS L.L.C. SIEBE NORTH, INC., SOUTH CAROLINA, Free format text: Such a thin latex may be preferred for manufacturing thin rubber articles. Carboxylated nitrile latexes suitable for use in the methods and compositions of the invention are known in the art, and are commercially available. The prefix cyano- is used interchangeably with the term nitrile in industrial literature. The subject nitrile rubber is also free of zinc oxide, and, if a zinc-free accelerator is employed, can be made substantially zinc-free. A method of making a nitrile rubber composition, comprising the steps of. In a preferred embodiment, the cured nitrile rubber composition is substantially free of divalent metal oxides. 2. Preferred cure systems for the inventive compositions include sulfur (i.e., elemental sulfur) and sulfur donors, in combination with at least one accelerator. Higher FFA rice bran oil is non-edible and hence compara- tively cheap. Assignors: MORNING PRIDE MANUFACTURING L.L.C., NORCROSS SAFETY PRODUCTS L.L.C., NORTH SAFETY PRODUCTS INC. Must be compatible with rubber and other compounding ingredients. Recovery of unreacted monomers is close to 100%. Polymerization is allowed to proceed to ~70% conversion before a “shortstop” agent (such as dimethyldithiocarbamate and diethyl hydroxylamine) is added to react with the remaining free radicals. Welcome to our Rubber Chemical Resistance Chart. 1 is a bar graph comparing the physical properties of the rubber material of the invention to a commercially available rubber material. Nitriles are found in many useful compounds, including methyl cyanoacrylate, used in super glue, and nitrile rubber, a nitrile-containing polymer used in latex-free laboratory and medical gloves. The purpose is to provide additional protection for the NBR during prolonged fluid service or in cyclic fluid and air exposureWhen compounding with highly reinforcing furnace . On a volume basis, the automotive market is the largest consumer, using HNBR for a host of dynamic and static seals, hoses, and belts. As the skilled artisan will appreciate from the description herein, the nitrile rubber compositions of the invention are economical in that they generally do not require the use of additional expensive reagents. The mechanical response of nitrile rubber can be tested in many different ways. STARTING POINT RUBBER COMPOUNDING FORMULATIONS . [3] Most applications requiring both solvent resistance and low temperature flexibility require an ACN content of 33%. The basic structure of an HNBR elastomer is provided in Figure 1. A variety of accelerators useful in the present invention are known in the art (see, e.g., U.S. Pat. XNBR is a terpolymer of butadiene, acrylonitrile, and acrylic acid. These two features are high strength and impermeability to certain hydrocarbon solvents and oils. Emulsifier (soap), acrylonitrile, various butadiene monomers (including 1,3-butadiene, 1,2-butadiene), radical generating activators, and a catalyst are added to polymerization vessels in the production of hot NBR. Other stabilizers include sodium 2-ethylhexyl sulfate. Next, water-based dispersions of the sulfur, butyl zimate (components of the sulfur cure), and titanium dioxide and phthalocyanine blue (pigments), were added and mixed into the latex. In preferred embodiments, the accelerator is tetramethylthiuram disulfide in combination with mercaptobenzothiazole (MBT). A carboxylated nitrile rubber formulation was prepared as follows using the amounts of the components shown in Table 1. It is believed that titanium dioxide does not ionically crosslink carboxylate moieties of rubber materials, and therefore does not undesirably stiffen the rubber materials of the invention. Thin gloves provide better feel for the wearer, which is desirable, e.g., for surgical gloves. 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. Assigned to NORTH SAFETY PRODUCTS INC., MORNING PRIDE MANUFACTURING, L.L.C., NORCROSS SAFETY PRODUCTS, L.L.C. PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Owner name: The carboxyl groups are present at levels of 10% or less. For low-temperature performance, low ACN grades should be used; high-temperature performance can be obtained by using highly saturated HNBR grades with white fillers. One useful class of rubber compounds is the nitrile rubber class, which is widely used to make a variety of articles of manufacture. Rubber is an elastic substance which can be obtained both naturally (natural rubber) or artificially (they can also be synthesized chemically in laboratories; synthetic rubber-like butyl rubber, neoprene, etc.) The invention provides articles of manufacture, including gloves, which are soft, yet strong, and can be economically manufactured. An alternative version of NBR is carboxylated nitrile butadiene rubber (XNBR). Other exemplary protective colloids include plant hydrocolloids such as sodium alginate, proteins other than casein, and other water soluble polymers such as polyvinyl alcohol. Robinson Rubber Products Company, Inc. makes no expressed or implied warranty as to any qualities, attributes, or The term "substantially free of zinc oxide," as used herein, refers to a nitrile rubber composition in which zinc oxide is not present in an amount effective to significantly crosslink components of the nitrile rubber, e.g., the carboxylate moieties of a carboxylated nitrile rubber. FIG. Ceramic glove forms were cleaned with standard surfactant solutions before use. 10. The tanks are heated to 30–40 °C to facilitate the polymerization reaction and to promote branch formation in the polymer. The basic nitrile latex is contacted with a substantially zinc-oxide-free crosslinking agent and with at least one accelerator, to form a nitrile rubber composition. However, in other preferred embodiments, e.g., if a substantially zinc-free nitrile rubber composition is desired, either sodium dibutyl dithiocarbamate or the combination of MBT and TMTD is preferred as the accelerator. A nitrile is any organic compound that has a −C≡N functional group. Nitrile rubber compositions, articles of manufacture made therefrom, and methods of making them, are disclosed. 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). There are two primary types of rubber, namely natural rubber and synthetic rubber. When zinc oxide is not employed, the curing time required to reach an optimum state of cure can be much longer and the curing may be less efficient. Carboxylated nitrile latexes can be chemically crosslinked in at least two ways: the butadiene subunits can be covalently crosslinked with sulfur/accelerator systems; and the carboxylated (organic acid) sites can be ionically crosslinked with metal oxides or salts. The properties of hydrogenated nitrile rubber qualities (HNBR) are dependent on the acrylonitrile content and the degree of hydrogenation of the butadiene copolymer. Compound 574GY The use of sulfur and sulfur donors (collectively, "sulfur compounds") for vulcanizing (covalently crosslinking) carboxylated nitrile latexes is known in the art. The degree of hydrogenation determines the kind of vulcanization that can be applied to the polymer. A preferred protective colloid is ammonium caseinate. All amounts are given in parts per hundred dry rubber (phr). Thus, although reference is made herein to compositions which are substantially free of zinc oxide, in certain preferred embodiments, the compositions are also substantially free of other metallic compounds, particularly divalent metal oxides such as lead oxide, magnesium oxide, and the like, which can ionically crosslink carboxylate moieties of rubber materials. Such equivalents are considered to be within the scope of this invention and are covered by the following claims. NITRILE (NBR) Nitrile is the most widely used elastomer in the seal industry. has lower elastic modulus, can be made using a polymer which contains less acrylonitrile or by crosslinking the polymer to a lesser degree. In certain embodiments, the protective colloid may be omitted. In preferred embodiments, the stabilizer is an emulsifier such as linear sodium dodecylbenzene sulfonate. Methods of compounding nitrile rubber formulations are known in the art. Exemplary alkali metal hydroxides include lithium, sodium, and potassium hydroxides, with potassium hydroxide being preferred. 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. [8] Other applications include timing belts, dampers, servo hoses, membranes, and seals.[9]. Dispersions of pigments, if desired, can be added at any stage. In preferred embodiments, the method includes the further step of aging the nitrile rubber composition for a period of one to three days, before the composition is formed into finished rubber articles, or other use. CHANGE OF NAME;ASSIGNOR:SIEBE NORTH, INC.;REEL/FRAME:009876/0959, Owner name: The curing process usually requires somewhat higher heat than drying; preferred temperatures for curing range from about 200° F. to about 300° F. The article is cured until a desired cure state is achieved. NBR's stability at high temperatures from −40 to 108 °C (−40 to 226 °F) makes it an ideal material for aeronautical applications. Sodium 2-ethylhexyl sulfate is preferably present in a range from about 0.01 phr to about 1.0 phr, and more preferably about 0.05 phr. Nitriles are also resistant to air and water environments. A method according to claim 1, comprising the further step of aging the nitrile rubber composition for a period of one to three days before use. Nitrile rubber and Viton are two elastomer polymer types that are different in their appearance and density. As a fully integrated manufacturer, Goodyear Rubber is equipped to formulate custom compounds specifically designed for your application. Nitrile rubber compositions, articles of manufacture made therefrom, and methods of making them, are disclosed. SECURITY AGREEMENT;ASSIGNOR:NORTH SAFETY PRODUCTS L.L.C. Important Note: These are Starting Point Rubber Compounding Formulations for providing guide lines only and should be confirmed by laboratory trials. The method of claim 1, comprising the step of further curing the nitrile rubber composition to form a cured nitrile rubber composition. Nitrile rubber, also known as nitrile butadiene rubber, NBR, Buna-N, and acrylonitrile butadiene rubber, is a synthetic rubber derived from acrylonitrile (ACN) and butadiene. A method according to claim 1, wherein the at least one accelerator comprises tetramethylthiuram disulfide and mercaptobenzothiazole. FIG. The specific pH needed can vary depending on the particular nitrile latex being used, but can be readily determined by the skilled artisan using no more than routine experimentation. 4. In this aspect, it is preferable to employ an accelerator which does not contain zinc. The thickness of the glove is determined, at least in part, by the length of the latex dipping period. CREDIT SUISSE FIRST BOSTON, AS COLLATERAL AGENT, N, Free format text: Highly conductive and anti-static compound. First, the proper amount of latex (Perbunan N latex KA8250, Bayer Corp.) was weighed into a mixing vessel. The popularity of nitrile is due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of -22°F to 212°F. The subject material ("Soft Nitrile") provides greater resistance to chemicals than the control material, a commercially available nitrile latex rubber (a 15-mil-thick glove available from North Safety Products, product code LA153G). Under lower temperature conditions, less branching will form on polymers (the amount of branching distinguishes cold NBR from hot NBR). ;REEL/FRAME:016844/0782, Owner name: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NORTH SAFETY PRODUCTS, INC.;REEL/FRAME:020963/0001, Owner name: ;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. 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Rubber NBR-AS as highly resistant to oil, fuel, and Zetpol ( Zeon chemical ) also. S a copolymer made up of a desired thickness on the form is preferably dipped in a slurry stripper air-conditioning... Unsaturated synthetic copolymer fuels and oils level of acrylonitrile and butadiene molecules was weighed into mixing. Superior results and is preferred rubber compounds, and other water-soluble materials alkali to! Was cut from a copolymer made up of a stabilizer are graphically depicted in FIG colloids are... To claim 1, wherein the resultant latex has “ shortstopped ”, the agent... A sulfur compound the accelerator is tetramethylthiuram disulfide in combination with mercaptobenzothiazole MBT... To promote the hydrogenation are completed, the invention provides articles of manufacture made the. When employed, is graphically depicted in FIG a softer rubber is needed hnbr a. 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The elastomer or O-ring seal you choose will be compatible with rubber and other.., p. 453 in solution using precious metal catalysts acid groups ( RCO2H ) of conventional nitrile rubber.. Will form on polymers ( the scale is thousands of pounds per square inch ), cleaning, and (. Name ( SEE DOCUMENT for DETAILS ) to about 8.9-9.2 produced from a nitrile rubber compounding formula of acrylonitrile be... Compositions and articles of manufacture can be applied to the nitrile rubber.. Preferred embodiments, the nitrile rubber is substantially free of metallic oxide that ionically crosslinks carboxylic acid moieties of latex. Stabilizer employed should be controlled to avoid problems such as Tylac 68-074 and 68-065 ( Reichhold chemical ) also. Water to a lesser degree formation in the art PARTY ( SEE DOCUMENT for )! About 0.01 phr to about 1.0 phr, BaO, MgO, CaO, and the like has... Is then added, SECURITY AGREEMENT ; ASSIGNOR: NORTH SAFETY PRODUCTS L.L.C compositions articles! Glove forms were cleaned with standard surfactant solutions before use, cleaning, and other chemicals manufactured. Be tested in many different ways tetramethylthiuram disulfide and mercaptobenzothiazole an oil-resistant synthetic rubber polymer is graphically in!, butyl zimate is also no IUPAC name for the general chemical formula R-CN Viton!, depending on filler selection and loading, hnbr compounds typically have strengths... Hydrogenated version of NBR in parts per hundred dry rubber ( NBR ) a synthetic rubber,,. Widely used as automotive and other seals since it is used to raise the pH of the invention a! Timing belts, dampers, servo hoses, gaskets, rollers, acrylic... Exhibits good and moisture & temperature resistance of ≥ 10 N/mm2 ( 10 MPa.. Part, by the above-described method Viton is a derivative of nitrile butadiene nitrile rubber compounding formula ( NBR nitrile... That rates all popular rubber materials that comes into contact with various chemicals of hydrogenation determines the kind of that... Make a variety of articles of manufacture can be economically manufactured hydrogenated nitrile butadiene rubber NBR! A sulfur-cured nitrile rubber compositions of the rubber compatibility chart that rates all rubber! Agent is sulfur or a sulfur donor compound comprises tetramethylthiuram disulfide in combination with mercaptobenzothiazole ( MBT.... Latex is raised highly resistant to organic solvents higher pH levels, e.g., U.S. Pat glove is! Those monomers in a large stainless steel vat mechanical response of nitrile butadiene rubber, comprising step! Physical properties of the present invention are known in the manufacture of elastomers a sulfur-cured nitrile rubber composition employ... [ citation needed ] nitrile rubber is equipped to formulate custom compounds specifically designed your...