Polyurethane Resin Formulae

Dimethyi Methyiphosphonate (DMMP) [756-79-6]. This is a water-soluble liquid, bp 185°C, with the formula CH3P(=0)(0CH3)2, contains 25% phosphorus, which is near the maximum possible for a phosphorus ester, and therefore highly efficient as a flame retardant. It is sold by Akzo Nobel as FYROL DMMR Applications include use as a viscosity depressant and flame retardant in alumina trihydrate (ATH)-filled polyester resins (66) such as used for bathtubs and shower stalls. Some applications have been found in rigid polyurethane foams and as an intermediate for making other flame retardants. In Europe, DMMP has an R46 (mutagen) classification, which deters its use. 

Amino polymers are derived from various amines and formaldehyde. Example amines used for these polymers are urea, benzoguanamine, melamine, and aniline, with the most common forms being urea and melamine resins. The formation of amino resins is complex, because the addition and condensation products of the amine and formaldehyde take multiple pathways involving by-products and side reactions. There is no general formula for a urea-based resins. The early reaction products are similar to those formed in phenolic resins or polyurethanes, but these early reaction products react further to form the final high polymer. Only the final reaction products will be considered in this section. 

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