High molecular weight polymeric perfluorinated copolyethers and

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From fluorine-containing reactant

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

252 54, 528397, C08G 6376, C08G 6700

Patent

active

044516460

ABSTRACT:
Amorphous, highly viscous high molecular weight copolyethers containing in excess of 200 total repeating units and formed of --CF.sub.2 --CF.sub.2 --O-- and --CF.sub.2 --O-- repeating units randomly distributed along the chain and linked to each other either directly or through an oxygen atom, in which latter case a peroxy group is present along the chain. These copolyethers, which are useful for preparing bifunctional telomers, high molecular weight fluoropolymers, and highly stable lubricants and heat exchange materials, are prepared by reacting molecular oxygen with tetrafluoroethylene dissolved in a fluorinated or chlorofluorinated solvent selected from the group consisting of dichlorodifluoromethane, perfluorocyclobutane, perfluorodimethylcyclobutane, 1,2-dichloro-hexafluoropropane and 1,2-dichloro-tetrafluoroethane in the presence of ultraviolet radiation and under such conditions that the molar ratio of the tetrafluoroethylene to the oxygen in the reactant feed is between about 0.1 and 2, the reaction temperature is between about -80.degree. C. and -35.degree. C., the total pressure at the point where the gaseous reactants are introduced into the reaction zone is between about 1 and 2 atmospheres, and the ratio F/VE is greater than 3.0.times.10.sup.-4 (mols./cc. watt hour) where F is the number of mols/hour of tetrafluoroethylene fed to the reaction zone, E is the number of watts of ultraviolet rays having a wave length below 3,300 .ANG. which penetrate the reaction zone, and V is the volume of the reaction zone.

REFERENCES:
patent: 2971949 (1961-02-01), Anderson
patent: 3442942 (1969-05-01), Sianesi
patent: 3650928 (1972-03-01), Sianesi
patent: 3665041 (1972-05-01), Sianesi
patent: 3715378 (1973-02-01), Sianesi
patent: 3810874 (1974-05-01), Mitsch
patent: 3847978 (1974-11-01), Sianesi et al.

LandOfFree

Say what you really think

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

Rating

High molecular weight polymeric perfluorinated copolyethers and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High molecular weight polymeric perfluorinated copolyethers and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High molecular weight polymeric perfluorinated copolyethers and will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1398816

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