Process for the preparation of polyisocyanates of the...

C - Chemistry – Metallurgy – 07 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C07C 249/14 (2006.01) C07C 251/00 (2006.01) C07C 263/04 (2006.01) C07C 263/18 (2006.01)

Patent

CA 2606107

Process for preparing mixtures comprising diphenylmethane diisocyantes and polyphenylpolymethylene polyisocyanates having a higher HunterLab color (L) number by staged reaction of the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one solvent whereby in a first stage the corresponding carbamoyl chlorides and amine hydrochlorides are formed and whereby in a subsequent stage the residual carbamoyl chlorides are dissociated into the corresponding polyisocyanates and hydrogen chloride and amine hydrochlorides are phosgenated to form ultimately the corresponding polyisocyanates in which some amine hydrochlorides remain unreacted at the point where residual excess phosgene is removed from the reaction mixture.

L'invention concerne un procédé de préparation de mélanges comprenant des diisocyanates de diphényleméthane et des polyisocyanates de polyphénylpolyméthylène possédant un numéro de couleur (L) HunTerLab supérieur, par réaction par étapes des mélanges correspondants de diphénylméthanediamines et de polyphénylpolyméthylènepolyamines avec un phosgène en présence d'au moins un solvant. Dans une première étape de la réaction, les chlorures de carbamoyle correspondant et les hydrochlorures d'amine sont formée et, dans une étape suivante, les chlorures de carbamoyle résiduels sont dissociés en polyisocyanates et chlorure d'hydrogène correspondants et des hydrochlorures d'amine sont phosgénés afin que soient finalement formés les polyisocyanates correspondants dans lesquels certains hydrochlorures d'amine n'ayant pas réagi restent, lorsque le phosgène résiduel excessif est enlevé du mélange réactionnel.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Process for the preparation of polyisocyanates of the... 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 the preparation of polyisocyanates of the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of polyisocyanates of the... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1505733

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.