Dimethyl terephthalate → HCID 67263852, compound
Reaction equation
[C:1]([O:13]C)(=[O:12])[C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8]C)=[O:7])=[CH:4][CH:3]=1.[CH:15]([OH:20])([OH:19])[CH2:16][CH2:17][CH3:18]>>[C:1]([OH:13])(=[O:12])[C:2]1[CH:11]=[CH:10][C:5]([C:6]([OH:8])=[O:7])=[CH:4][CH:3]=1.[CH:15]([OH:20])([OH:19])[CH2:16][CH2:17][CH3:18]Participants
Conditions
- Temperature
- 180 °C
Procedure
A polyethylene glycol terephtalate/polybutylene terephthalate copolymer may be synthesized from a mixture of dimethyl terephthalate, butanediol (in excess), polyethylene glycol, an antioxidant and a catalyst. The mixture is placed in a reaction vessel and heated to about 180° C., and methanol is distilled as transesterification proceeds. During the transesterification, the ester bond with methyl is replaced with an ester bond with butylene and/or the polyethylene glycol. After transesterification, the temperature is raised slowly to about 245° C., and a vacuum (finally less than 0.1 mbar) is achieved. The excess butanediol is distilled off and a prepolymer of butanediol terephthalate condenses with the polyethylene glycol to form a polyethylene/polybutylene terephthalate copolymer. A terephthalate moiety connects the polyethylene glycol units to the polybutylene terephthalate units of the copolymer and thus such a copolymer also is sometimes referred to as a polyethylene glycol terephthalate/polybutylene terephthalate copolymer (PEGT/PBT copolymer).
Workup
- customThe mixture is placed in a reaction vessel
- distillationmethanol is distilled as transesterification proceeds
- temperatureAfter transesterification, the temperature is raised slowly to about 245° C.
- distillationThe excess butanediol is distilled off
Sources & evidence
- ORD record
- ord-7224ae865f4446c4918890fda0a018b7
- Source dataset
- uspto-grants-2004_06
- Patent number
- US06752833B2
Reaction notes
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