US 9,809,678 B2
Polycarbonate polyol compositions and methods
Scott D. Allen, Ithaca, NY (US); Geoffrey W. Coates, Lansing, NY (US); Anna E. Cherian, Ithaca, NY (US); Chris A. Simoneau, Oxford, CT (US); Alexei A. Gridnev, Ithaca, NY (US); and Jay J. Farmer, Ithaca, NY (US)
Assigned to Saudi Aramco Technologies Company, Dhahran (SA)
Filed by Novomer, Inc., Ithaca, NY (US)
Filed on May 23, 2016, as Appl. No. 15/161,684.
Application 15/161,684 is a continuation of application No. 14/573,534, filed on Dec. 17, 2014, granted, now 9,376,531.
Application 14/573,534 is a continuation of application No. 14/040,001, filed on Sep. 27, 2013, granted, now 8,921,508, issued on Dec. 30, 2014.
Application 14/040,001 is a continuation of application No. 13/584,989, filed on Aug. 14, 2012, granted, now 8,604,155, issued on Dec. 10, 2013.
Application 13/584,989 is a continuation of application No. 12/994,544, granted, now 8,247,520, issued on Aug. 21, 2012, previously published as PCT/US2009/056220, filed on Sep. 8, 2009.
Claims priority of provisional application 61/095,178, filed on Sep. 8, 2008.
Prior Publication US 2016/0264728 A1, Sep. 15, 2016
Int. Cl. C08G 63/02 (2006.01); C08G 64/34 (2006.01); C08G 64/02 (2006.01); C08G 18/44 (2006.01)
CPC C08G 64/34 (2013.01) [C08G 18/44 (2013.01); C08G 64/0208 (2013.01)] 29 Claims
 
1. A method for the synthesis of aliphatic polycarbonate polyols having a high percentage of —OH end groups, the method comprising the steps of:
a) contacting a reaction mixture comprising one or more epoxides in the presence of carbon dioxide with a polymerization system comprising:
a metallosalenate metal complex; and
a chain transfer agent having a plurality of sites capable of initiating copolymerization of epoxides and CO2;
wherein the chain transfer agent has a structure Y-A-(Y)n,
where:
each —Y group is independently a functional group capable of initiating chain growth of epoxide CO2 copolymers and each Y group may be the same or different;
-A- is a covalent bond or a multivalent moiety; and
n is an integer between 1 and 10, inclusive;
wherein the molar ratio of metal complex to epoxide ranges from 1:100 to 1:1,000,000
b) allowing the polymerization reaction to proceed until a desired molecular weight aliphatic polycarbonate polyol has formed, wherein in the aliphatic polycarbonate polyol composition
at least 97% of the end groups are hydroxyl groups, and
more than 95% of the linkages formed by the metal complex are carbonate linkages; and
c) terminating the polymerization.