Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1981-05-12
1983-07-12
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
260695, 528409, 528417, 528421, C08G 6510, C08G 6518, C08G 6520, C07C 4311
Patent
active
043931995
ABSTRACT:
Method of carrying out cationic polymerization with molecular weight control in which a preinitiator precursor, e.g. a diol and a catalyst effective for cationic polymerization (or a preformed adduct of such precursor and catalyst) are mixed with a monomer (e.g. a cyclic ether) in proportions of one mol of precursor or adduct and n mols of monomer, where n is the relatively small number of mer units desired in the polymer, causing polymerization to proceed to completion, then treating the resulting living cationic polymer as desired, e.g. quenching with water to introduce a terminal hydroxyl group, adding another monomer to produce a block polymer, reacting with an anionic polymer, etc. Also polymers so formed. Such polymers have low polydispersity and conversion and yield of the desired polymer are high.
REFERENCES:
patent: 2792375 (1957-05-01), Bartelson
patent: 3417034 (1968-12-01), Hoy
patent: 3558722 (1971-01-01), Kobayashi et al.
patent: 3850856 (1974-11-01), Dreyfuss
patent: 4153786 (1979-05-01), Pruckmayr
Journal of Polymer Science, Part A-1, vol. 9, 265-279, (1971) "Cationic Copolymerization of Tetrahydrofuran with Epoxides".
Gaylord, N. G., High Polymers, vol. XIII, Interscience Publishers, Part I, pp. 1-2, 138-139, 189-191 & 303-304.
Briggs Sr. Wilbert J.
Gregg Edward B.
S R I International
LandOfFree
Cationic polymerization does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cationic polymerization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cationic polymerization will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-199613