Method of controlling molecular weight distribution of polytetra

Details Method of controlling molecular weight distribution of polytetra Method of controlling molecular weight distribution of polytetra

1993-04-02

1994-03-29

Mars, Howard T.

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

Organic compounds

Oxygen containing

568621, C07C 4134, C07C 4138

Patent

active

052986705

ABSTRACT:
Polytetramethylene ether glycols (PTMEG) are fractionated with liquid propane in an extractor under high pressure. Fractions are separated by altering the extraction pressure, which alters the solvent power of the propane. The polydispersities of all extracted PTMEG fractions are generally below 1.3. The addition of a cosolvent, preferably tetrahydrofuran, can effectively lower the initial extraction pressure and increase the efficiency of the extraction.

REFERENCES:
patent: 4306058 (1981-12-01), Copelin
patent: 4500705 (1985-02-01), Copelin
patent: 4762951 (1988-08-01), Mueller
patent: 4933503 (1990-06-01), Mueller
patent: 5053553 (1991-10-01), Dorai et al.

Affiliated with

Also associated with

Rating

Method of controlling molecular weight distribution of polytetra does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of controlling molecular weight distribution of polytetra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling molecular weight distribution of polytetra will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-793505