Structure of Urethane
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Urethane

Urethane 1. A polymer containing a urethane linkage. 2. Any organic chemical compound contaning a urethane functional group (or linkage). 3. The specific compound (NH2*COOC2H5). This ethyl ester is a white crystalline substance produced by the action of ammonia on ethyl carbonate or by heating urea nitrate and ethyl alcohol. It is used as a hypnotic, antipyretic, and antispasmodic. more...

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Generally, a urethane is an ester of a carbamic acid (RNHCOOQ, where R and Q represent many different organic compounds). Many can be created by an isocyanate reaction with a hydroxyl group of an alcohol (or other hydroxy containing compound) according to the following formula:

Although this reaction had been known for some decades, it was not until 1937 that Otto Bayer discovered how to make the very useful polyurethane plastics out of polyisocyanate and polyol (a molecule with multiple hydroxyl groups), (see Polyurethane). There are many other more specialized ways to make urethanes.

Urethane technology was brought to America in 1953 by Jean-Pierre Abbat and Dr. Fritz Hartmann.

Urethanes are used in pharmaceuticals, (bio)chemical analysis and plastics.

Urethane is also widely used in skateboard and in-line skate wheel production, effectively replacing the clay wheel used before that.

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Urethane Adhesive produces flexible bonds without primers
From Product News Network, 2/16/05

When mixed, 2-part Dev-Thane 5 becomes thixotropic paste with fixture time of 15 min and functional cure of 3 hr. Once cured, it has tensile strength of 2,100 psi and tear resistance of 400 pli. Adhesive produces no VOC emissions and withstands service temperatures up to 180[degrees]F dry and 120[degrees]F wet. Dev-Thane 5 is suited for primerless bonding of rubber or metal to glass, concrete, or wood, as well as bonding EPS to foam, foam to ABS, and aluminum to aluminum.

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DANVERS, MA - Devcon's new Dev-Thane 5 urethane adhesive is specially designed for primerless bonding of rubber or metal to glass, concrete, or wood. It is also excellent for bonding EPS to foam, foam to ABS, and aluminum to aluminum. It cures at room temperature to a tough yet exceptionally flexible bond (maximum elongation 200% per ASTM D412) with a hardness of 63 Shore D (ASTM D2240).

When mixed, Dev-Thane 5 two-part adhesive becomes a thixotropic paste with a pot life of 5 minutes. A pound covers 94 square inches at a thickness of 1/4". Its 100% solids formulation produces no VOC emissions. Fixture time is 15 minutes, and functional cure is 3 hours. When cured, Dev-Thane 5 has a tensile strength of 2100 psi and a tear resistance of 400 pli (ASTM D624) and withstands service temperatures up to 180[degrees] F dry, 120[degrees] F wet.

For more information, contact: David Bongiorni, Market Development Manager, Devcon, 30 Endicott Street, Danvers, MA 01923, Toll-Free: 1-800-933-8266, TEL: (978) 777-1100, FAX: (978) 774-0516, http://www.devcon.com/77.

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