Ulrich, Henri Guilford, Connecticut.
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Polymeric materials that are usually produced by reacting polyfunctional isocyanates [R(NCO)n, where R is alkyl or aryl] with a macrodiol, or polyol, and a glycol extender in the presence of a catalyst. The macrodiols are based on polyethers or polyesters or a combination of both. Some of these have terminal hydroxyl groups, while those reacted with an excess of diisocyanate have terminal isocyanate groups, as in structure (1).
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