Patent ID: 7790833

Claim:
A process for making a poly(trimethylene glycol carbonate trimethylene glycol ether) diol of structure wherein z is an integer of about 1 to 10; n is an integer of about 2 to 100; and each R is independently selected from the group consisting of H, C 1 -C 20 alkyl, C 3 -C 20 cyclic alkyl, C 5 -C 25 aryl, C 6 -C 20 alkaryl, and C 6 -C 20 arylalkyl, and wherein each R substituent can optionally form a C 3 -C 8 cyclic structural group with adjacent R substituents; the process comprising: contacting trimethylene carbonate or an R-substituted trimethylene carbonate with a solid acid catalyst at a temperature greater than the melting point of the trimethylene carbonate or R-substituted trimethylene carbonate, to form a mixture comprising a poly(trimethylene glycol carbonate trimethylene glycol ether) diol oligomer composition.