Urethane industry

Urethane grouts Urethane industry Urethane linkages Urethane plastisol Urethane polyesters Urethane polymers... 

Propylene oxide and other epoxides undergo homopolymerization to form polyethers. In industry the polymerization is started with multihinctional compounds to give a polyether stmcture having hydroxyl end groups. The hydroxyl end groups are utilized in a polyurethane forming reaction. This article is mainly concerned with propylene oxide (PO) and its various homopolymers that are used in the urethane industry. 

Urethane Industry Digest, Part B Marketing Guide, C. J. Swanson, Pubhshei, Hobday, Fla., June 1988. 

The volatility of difunctional isocyanates (such as tolylene diisocyanates, hexamethylene diisocyanate, etc.) creates many environmental problems in the urethane industry. These difficulties can be overcome by preparation of NCO-terminated oligomers with low vapor pressure. One approach is the preparation of NCO-ter-minated oligomers by partial cyclotrimerization of difunctional isocyanates. Usually this is achieved by a multi-step process which includes also deactivation of the catalyst at a certain conversion. During our work on cyclotrimerization of isocyanates we found that cyclic sulfonium zwitterions are very active cyclotrimerization catalysts (2). Recently we found that cyclic sulfonium zwitterions under certain reaction conditions act as anionic initiators. This behavior of cyclic sulfonium zwitterions permits preparation of isocyanate oligomers containing isocyanurate rings by a one-step procedure, eliminating the deactivation step. 

The great interest that many industries have shown in these low cost high performance foams, which eventually will sell for well below lrf/in.3, will bring a very rapid growth to this latest segment of the urethane industry. 

Source Stewart, S. A., A Glossary of Urethane Industry Terms, The Martin Sweets Co., Louisville, KY, 1991. 

We have an opportunity to shape and mold the future, and to benefit society by our struggle with assessing fire hazard. It is a challenge the urethane industry has already begun to meet. 

For the urethane industry, the immediate future will be affected only by a slight decrease in the volume of foam used by the furniture industry with no change in present combustion performance mix. 

Supercritical fractionation was investigated for the special-purpose polymers of both the diol and triol of a glycidyl azide polymer and a hydroxy-terminated polybutadiene. Hydroxy polybutadiene is used on a large scale as an ingredient in plastic bonded explosive (PBX) propellant formulations the hydroxy functionality of the polybutadiene reacts with an isocyanate functionality of another prepolymer to form a urethane. In the polysiloxanes section we referred to functionally terminated polymers as macromonomers in the terminology of the urethane industry, however, isocyanate-terminated polyester polymers are normally referred to as prepolymers in their reaction to form the urethane, even though the prepolymers are typically between 1,000 and 10,000 molecular weight. 

As expected, the aliphatic amines and aromatic amines (the strongest bases in the table) react the fastest. The urethanes industry has taken advantage of this reactivity in two-component commercial processes, demanding fast cure by using specially designed metering equipment and spray heads. 

Uses Lt. stabilizer, gloss retention aid for plastics and clear or pigmented coatings incl. automotive urethanes, industrial maintenance, UV-cured coatings, solv.-free polyesters, air-drying systems, baking enamels, inks Features Decreases crack formation... 

NeoRad NR-3709 NeoRad R-440 NeoRez R-940 Sancire 898 urethane industrial praners Wtcabond W-236 urethane industrial wood coatiigs Sancire 815... 

Institute for Building Environment and Energy Conservation 2006, Fluorocaibon Replacing Countermeasures for Foam Application Study Report in 2005, 25p, 2006 Japan Industrial Conference for Ozone Layer and Climate Protection 2009, http //www.jicop.org/japanese/jicop.html Japan Urethane Industry Association 2009, http //www. urethane-jp.org/... 

A composite for the total urethane industry projection by Mobay market researchers through 1980 is depicted in Figure 3 (3). 

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