Method for increasing the primary hydroxyl end groups in polyeth

Details Method for increasing the primary hydroxyl end groups in polyeth Method for increasing the primary hydroxyl end groups in polyeth

1980-03-03

1981-11-10

Nielsen, Earl A.

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

Organic compounds

Oxygen containing

528408, 528417, 568624, 568625, C08G 6520, C08G 6508

Patent

active

042999936

ABSTRACT:
A method for increasing the primary hydroxyl end groups in polyethers includes the steps of charging a reaction vessel with tetrahydrofuran and propylene oxide, adding BF.sub.3 or a BF.sub.3 -containing catalyst and then polymerizing the first pair of monomers to form a copolymer. After the first copolymerization is at least 60 percent complete, the method further includes the steps of adding ethylene oxide to the copolymer and unreacted monomers in the reaction vessel, and polymerizing the contents therein to form a terpolymer predominantly terminated by primary hydroxyl groups. The reaction is thereafter terminated and the terpolymer is separated from the remaining contents of the reaction vessel, washed and dried. The resulting terpolymer has from about 20 to about 80 weight percent of tetrahydrofuran, from about 10 to about 60 weight percent of propylene oxide, from about five to about 40 weight percent of ethylene oxide and at least 60 mole percent of terminal primary hydroxyl groups.

REFERENCES:
patent: 3380967 (1968-04-01), Lowe et al.
patent: 3425999 (1969-02-01), Axelrood et al.
patent: 4038296 (1977-07-01), Greif et al.
patent: 4183821 (1980-01-01), Langdon et al.

Affiliated with

Also associated with

Rating

Method for increasing the primary hydroxyl end groups in polyeth 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 for increasing the primary hydroxyl end groups in polyeth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for increasing the primary hydroxyl end groups in polyeth will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2363537