Title:
A manufacturing method of the methylenediphenyldiisocyanate isomeric mixture which has 2 [high] and 4'-methylenediphenyldiisocyanate purity
Document Type and Number:
Japanese Patent JP6087946
Kind Code:
B2
Abstract:
The present invention includes a process and apparatus for the production of methylene diphenyl diisocyanate (MDI) isomer mixtures with a low 2,2′-MDI isomer content and a high 2,4′-MDI isomer content. The resulting mixtures have an increased reactivity and are acceptable in food grade application due to the reduction in primary aromatic amines formed during the curing process. The process and apparatus also include controlling the amount of 4,4′-MDI, which is the most reactive isomer in the mixture allowing use in a wide variety of applications.
Inventors:
Andrey S. Melenobu
Gerald I. Jansma
Paul A. Gillis
Gerald I. Jansma
Paul A. Gillis
Application Number:
JP2014544773A
Publication Date:
March 01, 2017
Filing Date:
November 19, 2012
Export Citation:
Assignee:
Dow Global Technologies LLC
International Classes:
C07C263/20; C07C263/10; C07C265/14
Domestic Patent References:
| JP2005225879A | ||||
| JP2007532709A | ||||
| JP2006206593A |
Attorney, Agent or Firm:
Hiroshi Kobayashi
Norio Omori
Yasuhito Suzuki
Norio Omori
Yasuhito Suzuki