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Home › Process for simultaneously preparing 4,4′-diphenylmethanediamine and diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates

Process for simultaneously preparing 4,4′-diphenylmethanediamine and diphenylmethane diisocyanate and polyphenylenepolymethylene polyisocyanates

US Patent 7709679 · Granted May 4, 2010

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