For more information about our use of cookies, please view our Privacy Policy. You must accept before you can continue. Are you sure? Login with your account details to get access to our exclusive content. Safety ®™ Trademark of Dow or an affiliated company of Dow. Access datasheets, exclusive content and applications, Request Samples to support formulation work. Annually we request that you confirm your account is valid. Please try again later. Error occurred during login. The term "prepolymer" can be misleading to someone not fully conversant in the patois of polyurethane terminology. FIGURE 2.45 General preparation of a TDI—polypropylene oxide prepolymer. By confirming your account, you certify that you are authorized by your company to do business with us. In principle, a prepolymer could be formed by reacting diisocyanates with an excess of polyol to produce a polyol functional prepolymer with urethane functionality at its center, but this is not practiced commercially and the term "prepolymer" is always used to refer to polyols terminated with isocyanate functionality. Copyright © Dow (1995-2020). Copyright © Dow (1995-2020). ECHELON MC 401 Prepolymer must be protected against humidity and must be stored in unopened drums. Monomeric MDI (M, MI), polymeric MDI (M20, M70), TDI (T80) and one of the broadest portfolio of blends, isocyanates derivatives Transportation innovation for a world on the move, Pioneering a new age of beauty? Smaller quantities would be prepared by a simple ratio adjustment. 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MobilityScience™ When making polyurethane prepolymer under the conditions and compositions described in this filing, typical levels of residual metals and other contaminants readily residing within the commercially employed polyether polyol Polyurethanes are one of the most versatile plastic materials available. A true "prepolymer" in this regard would then distill the excess isocyanate from the product. Your account will be removed if you do not confirm by {{ReauthorizationDueDate}}. Information on our speakers presenting at the IEC 2020 Conference and how to request a meeting with our team. A polyurethane prepolymer is one in which all of the polyol hydroxyl end groups have been reacted with isocyanate groups leaving isocyanate functionality at the termini instead of hydroxyls. Diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI) sold under the Lupranate® name. Academic library - free online college e textbooks - info{at}ebrary.net - © 2014 - 2020. Please login or reset your password. Minimization of viscosity is usually a function of pH control, which under basic conditions can result in trimerization of the isocyanate. Dow products help address bottlenecking in antibody and viral testing process. All Rights Reserved. Prepolymers offer an attractive approach allowing one to prepare cast systems, especially elastomers, from entirely liquid components. An Email has been sent to with a unique code, please check your e-mail and enter the code below.

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