Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1980-11-12
1984-11-06
Wong, Jr., Harry
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
524546, C08F11426
Patent
active
044813430
ABSTRACT:
The process for the polymerization in aqueous dispersion of tetrafluoroethylene in the presence of an emulsifier and an initiator, with the latter yielding free radicals between 0.degree. and 45.degree. C. and being destroyed for a temperature above 45.degree. C., characterized by the fact that the temperature of the reaction medium as a function of polymerization time is made to follow an ascending curve, Temperature .degree.C. versus t (time in minutes) whose slope (.DELTA.T/.DELTA.t) cannot be less than 1/6, .DELTA.T representing the temperature in .degree.C. at a given time in minutes .DELTA.t, with this ascending curve being situated inside of a sector limited by two straight lines y=(7/12)x and y=(15/7)x+45, in which y and x respectively represent the temperature in .degree.C. and the time expressed in minutes, and by the fact that the initiator is destroyed before the concentration of polytetrafluoroethylene in the dispersion has reached 20%.
REFERENCES:
patent: 3345317 (1967-10-01), Hoashi
patent: 3535301 (1970-10-01), Groppelli et al.
Produits Chimiques Ugine Kuhlmann
Wong, Jr. Harry
LandOfFree
Process for the polymerization of tetrafluoroethylene in aqueous 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 polymerization of tetrafluoroethylene in aqueous, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the polymerization of tetrafluoroethylene in aqueous will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1043069