IP Library › Granted Patent US 7,238,840
Granted Patent B2
US 7,238,840 · App. 10/947,103 · Granted Jul 3, 2007

Process for the production of diaminodiphenylmethane and its higher homologues

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Quick Facts
Patent No.
US 7,238,840
App. No.
10/947,103
Granted
Jul 3, 2007
Kind
B2
Abstract

Method of preparing diaminodiphenylmethane and higher homologues thereof from aniline and formaldehyde in the presence of heterogeneous solid acid catalysts selected from (a) delaminated zeolites and/or (b) metal silicate catalysts having an ordered mesoporous pore structure and/or (c) delaminated phyllosilicates.

Claims (6)

1. A method of preparing diaminodiphenylmethane and higher homologues thereof comprising the step of condensing aniline and formaldehyde in the presence of a heterogeneous solid acid catalyst selected from the group consisting of delaminated zeolites, metal silicate catalysts having an ordered mesoporous pore structure, delaminated phyllosilicates, and mixtures thereof.

2. The method according to claim 1 whereby the catalyst is selected from the group consisting of ITQ-2, ITQ-6, ITQ-18, MCM-41, delaminated magadiite and delaminated kenyaite.

3. A method of preparing polyisocyanates comprising the steps of:

(a) condensing aniline and formaldehyde either prior to the addition of or in the presence of a heterogeneous solid acid catalyst selected from the group consisting of delaminated zeolites, metal silicate catalysts having an ordered mesoporous pore structure, delaminated phyllosilicates, and mixtures thereof to produce diaminodiphenylmethane and higher homologues thereof, and

(b) converting the diaminodiphenylmethane and higher homologues thereof, in the presence of the heterogeneous solid acid catalyst, to corresponding polyisocyanates.

4. The method according to claim 3 whereby the catalyst is selected from the group consisting of ITQ-2, ITQ-6, ITQ-18, MCM-41, delaminated magadiite and delaminated kenyaite.

Assignments (4)
TERMINATION AND RELEASE OF SECURITY INTEREST IN UNITED STATES TRADEMARKS AND PATENTS Recorded Jun 13, 2018
From: JPMORGAN CHASE BANK, N.A.
To: HUNTSMAN INTERNATIONAL LLC
Reel/Frame 046355/0243 →
CORRECTIVE ASSIGNMENT TO CORRECT THE CHANGE NATURE OF CONVEYANCE FROM ASSIGNMENT TO SECURITY AGREEMENT PREVIOUSLY RECORDED ON REEL 025855 FRAME 0783. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Jun 28, 2011
From: DEUTSCHE BANK TRUST AG NEW YORK BRANCH, AS RESIGNING ADMINISTRATIVE AGENT AND COLLATERAL AGENT
To: JPMORGAN CHASE BANK N.A., AS COLLATERAL AGENT
Reel/Frame 026515/0617 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 28, 2011
From: DEUTSCHE BANK TRUST AG NEW YORK BRANCH, AS RESIGNING ADMINISTRATIVE AGENT AND COLLATERAL AGENT
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 025855/0783 →
SECURITY INTEREST Recorded Nov 21, 2005
From: HUNTSMAN INTERNATIONAL LLC
To: DEUTSCHE BANK AG NEW YORK BRANCH, AS AGENT
Reel/Frame 021158/0479 →