Urethane


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urethane

[′yu̇r·ə‚thān]
(organic chemistry)
CO(NH2)OC2H5 A combustible, toxic, colorless powder; soluble in water and alcohol; melts at 49°C; used as a solvent and chemical intermediate and in biochemical research and veterinary medicine. Also known as ethyl carbamate; ethyl urethane.

Urethane

 

(also carbamate), NH2COOR, any of the esters of carbamic acid (H2NCOOH) that are unknown in the free state. Urethanes are colorless crystalline compounds. Unlike the acid, the esters are stable; thus, ethylurethane (H2NCOOC2H5; sometimes simply called urethane, from which the name of the entire class is derived) has a melting point of 49°C and a boiling point of 184°C.

Urethanes are prepared by, among other methods, reacting alcohols with urea [CO(NH2)2] or isocyanic acid (HNCO). N-substituted urethanes, formed from the reaction of isocyanates (RNCO) with alcohols and phenols, are used in the identification of phenols. Polyurethanes are widely used in industry in the form of rubbers, adhesives, varnishes, and fibers. Certain substituted urethanes are used as pharmaceuticals; examples include proserine methyl sulfate, carbachol, and propanidid.

References in periodicals archive ?
Moreover, the fracture surfaces of poly(benzoxazine-co-urethane)s with different weight percent of urethane did not display any phase separation, indicating that a homogeneous structure was formed in poly(benzoxazine-co-urethane)s.
The final properties of a given urethane system will depend on the stoichiometry ratio used.
The cores did not show the core stain usually associated with conventional urethane cores.
Complete production lines and components for urethane and phenolic foams include continuous foam slab, bun, and log systems of 2-96 in.
First, the adhesive compound is applied to the metal and cured to create a bond; then the urethane element is cast in place and bonds to the adhesive as it cures.
Until all scientific research is completed and evaluated, and regulations established, FDA is working with industry to reduce any potential risk to humans from urethane and is participating in tests to find out if the small amounts of urethane present in alcoholic beverages might be harmful.
Unlike some of the chemical controversies of the past, such as DDT and saccharine, there is no disputing the fact that urethane is a carcinogen,' says Michael Jacobson, the group's executive director.
We take pride in BioSolar's selection of Stevens Urethane based on our history of successfully manufacturing products for "can't fail" applications.
The mill can also be used to integrate company logos into molds and to refine molded urethane products such as hydrocyclones and roller casings, ensuring that finished parts meet strict tolerances.
Information is available from this manufacturer of custom urethane processing systems and precision fluid flow measurement systems.
New England Urethane (NEU) of North Haven, Connecticut, USA, has introduced a proprietary nonplasticized urethane blend for a range of medical, consumer, and industrial-products applications, including those requiring films.