Title: Process for the preparation of polyaryl amines having methylene bridges

What is claimed is:

1. In a process for the preparation of polyaryl amines having methylene bridges from arylamines and formaldehyde in the presence of acids wherein 0.25-1.3 mol of formaldehyde per mol of arylamine is added in a first mixing step in the presence of 0.85-1.01 mol of acid, the improvement which comprises adding at least 0.1 mol of free arylamine before the formed compounds of the anhydroformaldehyde aniline type are noticeably rearranged into benzyl anilines, then reacting the reaction mixture at temperatures between 30° and 70° C. to form benzyl anilines and, finally, converting the resulting precondensate at temperatures between 70° and 120° C. into polyamines having methylene bridges.

2. A process according to claim 1, wherein a portion of the acid is added simultaneously with free arylamine as free acid or salt.

3. A process according to claim 1, wherein the acid is methane sulfonic acid and trifluoro acetic acid.

4. A process according to claim 1, wherein the arylamine is aniline.


Other info:


Inventors: Biller, Efim (Zurich, CH)

Application Number: 06/140914
Filing Date: 1980-04-16
Publication_date: 1983-07-12
Assignee: ELPROCHINE AG (CH)

Primary Class(es): 564/331 562/605, 564/333, 562/114
Other Classes: C07C85/08
US Patent Ref:

3297759	January, 1967	Curtis et al.	260/570	Continuous process for producing mixtures of methylene-bridged polyphenyl polyamines
3367969	February, 1968	Perkins	260/570	Process for the preparation of 4, 4'-methylenedianiline
3857890	December, 1974	Recchia	260/570	PROCESS FOR PREPARING METHYLENE-DI-ANILINES
3996283	December, 1976	Korofel	260/570	Process for the production of polyamines

Other Refs:
Primary Examiner: Hines, Robert V.
Assistant Examiner:
Attorney: Sprung, Horn, Kramer & Woods