Bayer Corporation

Miles Inc.

Bayer Polymers LLC

Louis Renbaum

Mark S Solomon

William D Tippins

William E Slack

Kenneth L Dunlap

Larry W Arndt

Disclosed herein is a process for preparing a reaction product containing methylene diphenylamine, comprising reacting aniline and formaldehyde in the presence of an acid catalyst wherein the acid level of the resulting reaction mixture is reduced during digestion of the reaction mixture.

Process for preparing methylene diphenylamines by partial neutralization of acidic methylene diphenylamines

Process for preparing methylene diphenylamines by partial neutralization

Disclosed herein is a process for recovering toluene diisocyanate (TDI) from a TDI residue solution, comprising mixing the residue solution with a polyisocyanate consisting essentially of methylenediphenyl diisocyanate (MDI) or MDI in combination with its higher ring oligomer, followed by heating the resulting mixture over a temperature range of 130.degree. to 250.degree. C. for a period of time sufficient to remove free TDI and thermally splittable TDI generated from equilibration of the TDI residue with MDI or the MDI oligomer by either a batch or continuous process.

Toluene diisocyanate residue

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Richmond Hill, GA, United States of America

Louis Renbaum