Process for the preparation of blocked isocyanates

Details Process for the preparation of blocked isocyanates Process for the preparation of blocked isocyanates

1995-02-08

1995-11-14

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 44, 560169, C07C22924

Patent

active

054668603

ABSTRACT:
A process for the preparation of blocked isocyanates by reaction of free isocyanates under water-free conditions with blocking agents containing acid hydrogen in the presence of basic catalysts, these being one or more alkali hydroxides, particularly lithium hydroxide. The process leads to yellowing-free products with a low alkali content which may be used as cross-linking agents for polyols, particularly in the lacquer sector.

REFERENCES:
patent: 3746689 (1973-07-01), Narayan et al.
patent: 4068086 (1978-01-01), Dalibor
patent: 4132843 (1979-01-01), Dalibor
patent: 4220749 (1980-09-01), Reichmann et al.
patent: 4340712 (1982-07-01), Reichmann et al.
patent: 4393238 (1983-07-01), Zengel et al.
patent: 5332965 (1982-06-01), Dalibor

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