Process for the preparation of oligocarbonates with two catalyst

Details Process for the preparation of oligocarbonates with two catalyst Process for the preparation of oligocarbonates with two catalyst

1975-12-04

1977-01-25

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260 47XA, C07C 6806

Patent

active

040051218

ABSTRACT:
A process for the preparation of linear aliphatic polycarbonates having terminal hydroxyl groups is carried out in two stages:
I. in the first stage, the transesterification is carried out in the presence of a basic catalyst at a temperature below 140.degree. C, and
Ii. in the second stage, after complete destruction of the basic catalyst, the transesterification is completed in the presence of an acid catalyst at a temperature of between 200.degree. and 250.degree. C.
The polycarbonate-diols obtained are useful for the preparation of polyurethane elastomers which are resistant to hydrolysis.

REFERENCES:
patent: 2915529 (1959-12-01), Bell
patent: 3549682 (1970-12-01), Vernaleken et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1478627