Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having a halogen atom or oxygen single bonded...
Patent
1982-05-24
1983-12-27
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having a halogen atom or oxygen single bonded...
C08G 6362
Patent
active
044232055
ABSTRACT:
A process for the production of a polycarbonate glycol wherein a cyclic carbonate is catalyzed at elevated temperature by a cationic initiator. Compounds of structure (I) ##STR1## where R is alkylene, R' and R" are independently hydrogen, alkyl, alkaryl, aralkyl, or aryl, are heated at an elevated temperature in the presence of cationic initiators such as trimethyl aluminum to form a polymer. Production of a glycol product is assured by subsequent heating at about 200.degree.-220.degree. C. to form a polymer containing carbonate units of ##STR2## and having hydroxy end units bonded to a carbon not part of a carbonate function. The molecular weight of polycarbonate glycol is preferably at least about 1,000.
REFERENCES:
patent: 3301824 (1967-01-01), Hostettler et al.
patent: 3758443 (1973-09-01), Konig et al.
patent: 4079038 (1978-03-01), Choi et al.
patent: 4160853 (1979-07-01), Ammons
Journal of the American Chemical Society, vol. 80, Sarel et al., pp. 4596-4599, (1958).
Encyclopedia of Polymer Science and Technology, vol. 10, pp. 710-764, (1969).
Journal of Organic Chemistry, vol. 45, Nomura et al., pp. 3735-3738, (1980).
Angew., Chem. Int. Ed. Engl. 19, No. 9, Ball et al., pp. 718-719, (1980).
Ethyl Corporation
Hunt John F.
Johnson Donald L.
Phynes Lucille M.
Sieberth John F.
LandOfFree
Cationic polymerization of cyclic carbonates 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 of cyclic carbonates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cationic polymerization of cyclic carbonates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-948537