Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1983-01-26
1984-08-14
Torrence, Dolph H.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260453AM, 521160, C07C11802, C07C119048
Patent
active
044656394
ABSTRACT:
Addition of controlled amounts of water to the reaction mixture produced by phosgenation of a mixture of polymethylene polyphenyl polyamines (and like polyamines produced by condensation of formaldehyde and aromatic amines) prior to complete removal of excess phosgene gives rise to the corresponding polymethylene polyphenyl polyisocyanates having significantly improved properties. Not only is the color of the product, and of polyurethane foams prepared therefrom, significantly lighter but the proportion of higher molecular weight products is significantly less and the viscosity is less. No undesirable by-products are introduced into the polyisocyanate as a result of the process.
REFERENCES:
patent: 3179680 (1965-04-01), Kober
patent: 3526652 (1970-01-01), Powers
patent: 3636030 (1972-01-01), Perkins
patent: 3641094 (1972-02-01), Arlt et al.
patent: 4221877 (1980-09-01), Cuscurida et al.
Armitage Robert A.
Firth Denis A.
The Upjohn Company
Torrence Dolph H.
LandOfFree
Process for polyisocyanates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for polyisocyanates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for polyisocyanates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-113676