1,3-Bis(1-isocyanato-1-methylethyl)benzene

244.29

244.29

220-474-4

YMD74QL0TC

DTXSID4027498

Clear colorless mobile liquid at room temperature

29291090

58.9

4.74 (est)

Liquid

1.06 mg/L at 25 deg C

-10°C(lit.)

106 °C

308 °F

1.515

In water, 2.29 mg/L at 25 deg C (est)

0-10°C

0.0032 mm Hg at 25 deg C

Henry's Law constant = 3.22X10-6 atm-cu m/mole at 25 °C (est)

Specific heat = 1.9 J/g-deg C at 60 °C; 2.0 J/g-deg C at 160 °C|Molar volume = 224.37 cu cm/mole|Hydroxyl radical reaction rate constant = 1.01X10-12 cu cm/molecule-sec at 25 °C (est)

III

6.1(b)

2206

3

20/21/22-36/37/38-43-50/53-48/23-36/38-26

26-36-61-60-45-36/37-28

CY8480000

Xn,N,T+

P260-P273-P280-P284-P305 + P351 + P338-P310

H315-H317-H319-H330-H372-H410

SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

|Danger|H315 (90.06%): Causes skin irritation [Warning Skin corrosion/irritation]|P260, P261, P264, P270, P271, P272, P273, P280, P284, P285, P302+P352, P304+P340, P304+P341, P305+P351+P338, P310, P312, P314, P320, P321, P332+P313, P333+P313, P337+P313, P342+P311, P362, P363, P391, P403+P233, P405, and P501|Aggregated GHS information provided by 166 companies from 11 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H315: Causes skin irritation [Warning Skin corrosion/irritation]|P260, P261, P264, P270, P271, P272, P280, P284, P285, P302+P352, P304+P340, P304+P341, P305+P351+P338, P310, P312, P314, P320, P321, P332+P313, P333+P313, P337+P313, P342+P311, P362, P363, P403+P233, P405, and P501

SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.

A skin and eye irritant.

IDENTIFICATION AND USE: 1,3-Bis(1-isocyanato-1-methyl)benzene is a clear colorless liquid at room temperature. It is insoluble and reacts with water. It is used for the production of polyurethane formed plastics, elastomers, duromers and adhesives. It is also used in specialty coatings, aqueous dispersions, herbicide coatings, adhesives, thermoplastic urethanes and lacquers. Other common commercial products include fabric and leather finishes, adhesives, automotive paints, printing inks, sealants and wood coatings. It is used in injection moldings, surface coatings and cast elastomers in polyurethane industry. HUMAN EXPOSURE AND TOXICITY: In facilities than manufacture or use 1,3-Bis(1-isocyanato-1-methylethyl)benzene employees were evaluated using immunoglobulin (Ig) and IgG serum antibody enzyme linked immunosorbent assay (ELISA) studies. No work related asthma was noted. However, there were some irritant symptoms, mainly respiratory or ocular. This chemical is a skin and eye irritant. Occupational exposure to this chemical can result from dermal contact or inhalation where this chemical use used or produced in the workplace. ANIMAL STUDIES: In rats the LD50 oral dose is 4,600 mg/kg; LD50 Guinea Pigs inhalation is 240 mg/cu m/1 hr.

LD50 Rat oral 4600 mg/kg|LD50 Guinea pig inhalation 240 mg/m3 for 1 hr

1,3-Bis(1-isocyanato-1-methylethyl)benzene's production and use in coatings, dispersions, inks, sealants, adhesives, lacquers, and paints(1) may result in its release to the environment through various waste streams. Its use in wood coatings(1) in particular may result in its direct release to the environment(SRC).

TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 9,000(SRC), determined from a structure estimation method(2), indicates that 1,3-bis(1-isocyanato-1-methylethyl)benzene is expected to be immobile in soil(SRC). However, since isocyanates hydrolyze rapidly in water(3), soil mobility, biodegradation, and other fate processes of 1,3-bis(1-isocyanato-1-methylethyl)benzene are not expected to be important fate process(SRC). Volatilization of 1,3-bis(1-isocyanato-1-methylethyl)benzene from moist soil surfaces is not expected to be an important fate process(SRC) given an estimated Henry's Law constant of 3.2X10-6 atm-cu m/mole(SRC), using a fragment constant estimation method(4) 1,3-bis(1-isocyanato-1-methylethyl)benzene is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 3.2X10-3 mm Hg, determined from a fragment constant method(5).|AQUATIC FATE: Since isocyanates hydrolyze rapidly in water(1), biodegradation, aquatic bioconcentration, volatilization and adsorption to sediment of 1,3-bis(1-isocyanato-1-methylethyl)benzene are not expected to be important fate processes(SRC).|ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1,3-bis(1-isocyanato-1-methylethyl)benzene, which has a vapor pressure of 3.2X10-3 mm Hg at 25 °C(SRC), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 1,3-bis(1-isocyanato-1-methylethyl)benzene is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 13 hours (SRC), calculated from its rate constant of 1.0X10-11 cu cm/molecule-sec at 25 °C(SRC) that was derived using a structure estimation method(2) 1,3-Bis(1-isocyanato-1-methylethyl)benzene does not contain chromophores that absorb at wavelengths >290 nm(3) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC).

The rate constant for the vapor-phase reaction of 1,3-bis(1-isocyanato-1-methylethyl)benzene with photochemically-produced hydroxyl radicals has been estimated as 1.01X10-11 cu cm/molecule-sec at 25 °C(SRC) using a structure estimation method(1). This corresponds to an atmospheric half-life of about 13 hours(SRC) at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm(1). 1,3-Bis(1-isocyanato-1-methylethyl)benzene, similar to most isocyanates(2-5), is expected to hydrolyze in aqueous solution(SRC). In water, the isocyanate group is expected to react to form an unstable acid intermediate followed by further hydrolysis to form an amine or insoluble ureas(5). The measured hydrolysis half life of 1,3-bis(1-isocyanato-1-methylethyl)benzene at pH 7 is 0.4 hours at 25 degrees C(6). Anionic homopolymerization can also occur yielding high molecular weight cross-linked isocyanates(2). 1,3-Bis(1-isocyanato-1-methylethyl)benzene does not contain chromophores that typically absorb at wavelengths >290 nm(7) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC).

1,3-Bis(1-isocyanato-1-methylethyl)benzene, similar to most isocyanates(1-4), is expected to hydrolyze in aqueous solution; therefore, bioconcentration will not be environmentally relevant(SRC).

1,3-Bis(1-isocyanato-1-methylethyl)benzene, similar to most isocyanates(1-4), is expected to hydrolyze in aqueous solution; therefore, leaching and adsorption to sediment will not be environmentally relevant(SRC).

1,3-Bis(1-isocyanato-1-methylethyl)benzene, similar to most isocyanates(1-4), is expected to hydrolyze in aqueous solution; therefore, volatilization from water will not be environmentally relevant(SRC).

Occupational exposure to 1,3-bis(1-isocyanato-1-methylethyl)benzene may occur through dermal contact or inhalation of this compound at workplaces where 1,3-bis(1-isocyanato-1-methylethyl)benzene is produced or used. Exposure to 1,3-bis(1-isocyanato-1-methylethyl)benzene among the general population is not expected due to the rapid hydrolysis when exposed to water in the environment but limited exposure may be present during the use of commercial products containing this compound. (SRC)

/SRP:/ Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR as necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Isocyanates, aliphatic thiocyanates, and related compounds/|/SRP:/ Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for pulmonary edema and treat if necessary ... . Monitor for shock and treat if necessary ... . Monitor for seizures and treat if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patent can swallow, has a strong gag reflex, and does not drool. Administer activated charcoal ... . /Isocyanates, aliphatic thiocyanates, and related compounds/|/SRP:/ Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in severe respiratory distress. Positive-pressure ventilation techniques with a bag valve mask device may be beneficial. Consider drug therapy for pulmonary edema ... . Consider administering a beta agonist such as albuterol for severe bronchospasm ... . Monitor cardiac rhythm and treat arrhythmias if necessary ... . Start IV administration of D5W /SRP: "To keep open", minimal flow rate/. Use 0.9% saline (NS) or lactated Ringer's (LR) if signs of hypovolemia are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors if patient is hypotensive with a normal fluid volume. Watch for signs of fluid overload ... . Treat seizures with diazepam or lorazepam ... . Treat exposure to Lethane 60 Lethane 384, Thanite, methyl, ethyl, or isopropyl thiocyanates with the cyanide antidote kit. DIRECT PHYSICIAN ORDER ONLY ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Isocyanates, aliphatic thiocyanates, and related compounds/

/SURVEILLANCE/ ...96 workers employed at facilities that manufacture or use TMXDI (meta) aliphatic isocyanate and TMI (meta) unsaturated aliphatic isocyanate /were evaluated using/ immunoglobulin (Ig) and IgG serum antibody enzyme-linked immunosorbent assay (ELISA) studies and a questionnaire designed to identify symptoms compatible with work-related syndromes such as asthma and hypersensitivity pneumonitis. There were no workers with immunologically induced disease due to TMI isocyanate or TMXDI isocyanate nor were there any workers whose questionnaires suggested new onset of asthma. Approximately 40% of workers experienced some irritant symptoms, mostly upper respiratory or ocular. One worker had low level IgE antibody against TMXDI-HSA but had no work-related respiratory symptoms. Very low-level IgG against TMI-HSA or TMXDI-HSA was present in 7% of workers, all of whom were in the high-exposure category.

Adhesive manufacturing|Benzene, 1,3-bis(1-isocyanato-1-methylethyl)-: ACTIVE|PMN - indicates a commenced PMN (Pre-Manufacture Notices) substance.|FDA approved for use in food-packaging under specific listings in the Code of Federal Regulations (CFR) Title 21-Food and Drugs Chapter I-Food and Drug Administration, Department of Health and Human Services