Continuous preparation of low unsaturation polyoxyalkylene polye

Details Continuous preparation of low unsaturation polyoxyalkylene polye Continuous preparation of low unsaturation polyoxyalkylene polye

1996-07-18

1997-11-18

Geist, Gary

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568620, 568621, 568613, 502175, C07C 4311

Patent

active

056890125

ABSTRACT:
A continuous process for the preparation of polyoxyalkylene polyethers using DMC catalysts as the polyoxyalkylation catalyst employs continuous addition of alkylene oxide in conjunction with continuous addition of starter and catalyst to a continuous oxyalkylation reactor. Despite the continuous introduction of starter, the molecular weight distribution of the polyether product is quite narrow, as indicated by the exceptionally low polydispersity of the product. The presence of low molecular weight species during the majority of the polyoxyalkylation also substantially eliminates extremely high molecular weight fractions having molecular weights greater than 100,000 Da, again without appreciably broadening molecular weight distribution. By withdrawing intermediate molecular weight polyether product or diverting a portion of the end product to prepare a catalyst/starter mixture, rapid and sustained reaction rates can be achieved while employing low molecular weight starters. Continuous build ratios in excess of 0.98 can be achieved.

REFERENCES:
patent: 3393243 (1968-07-01), Cuscurida
patent: 3404109 (1968-10-01), Milgrom
patent: 3427334 (1969-02-01), Akros
patent: 3538043 (1970-11-01), Herold
patent: 3900518 (1975-08-01), Milgrom
patent: 3941849 (1976-03-01), Herold
patent: 4282387 (1981-08-01), Olstowski et al.
patent: 4477589 (1984-10-01), van der Hulst et al.
patent: 5010187 (1991-04-01), Heuvelsland
patent: 5114619 (1992-05-01), Heuvelsland et al.
patent: 5145883 (1992-09-01), Saito et al.
patent: 5158922 (1992-10-01), Hinney et al.
patent: 5470813 (1995-11-01), Le-Khac
patent: 5482908 (1996-01-01), Le-Khac
"Testing Urethane Foam Polyol Raw Materials", ASTM D-2849-69, pp. 913-931, Dec. 19. 1969.

Affiliated with

Also associated with

Rating

Continuous preparation of low unsaturation polyoxyalkylene polye does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Continuous preparation of low unsaturation polyoxyalkylene polye, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous preparation of low unsaturation polyoxyalkylene polye will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1567260