Process for improving the flowability of dimerized 2,4-tolylenediisocyanate

US5100998A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Richard Kopp · Cologne, DE
• Gerhard Grogler · Leverkusen, DE
• Heinrich Hess · Cologne, DE
• Lutz Georgias · Dormagen, DE
• Helmut Hurnik · Leverkusen, DE
• Hans-Dieter Thomas · Bensberg, DE

Key dates

• Filing date: Jan 8, 1991
• Grant date: Mar 31, 1992
• Expiry date: Jan 8, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D229/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for improving the flowability and preventing the agglomeration of finely divided dimerized 2,4-toluene diisocyanate in which a precipitated silicas and/or pyrogenic silica having a hydrophobic surface is added to the finely divided dimerized 2,4-toluene diisocyanate. The invention also relates to the finely divided dimerized 2,4-toluene diisocyanate prepared by this process.