Production of terephthalate esters by degradative transesterific

Details Production of terephthalate esters by degradative transesterific Production of terephthalate esters by degradative transesterific

1990-03-15

1992-03-31

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 79, 560 96, 568868, C07C 6760, C07C 6703

Patent

active

051010640

ABSTRACT:
A process for the production of terephthalate diesters having the following formula (I). ##STR1## Substituents R and R' are the same or different and represent a straight chain, branched or cyclic aliphatic group, an aromatic group, an alkaryl group or an aralkyl group, each group having from 6 to 20 carbon atoms. The process involves reacting a terephthalate polyester with a high molecular weight alcohol or a mixture of high molecular weight alcohols each having from 6 to 20 carbon atoms, in the presence of a catalyst and recovering the desired compound according to formula (I). This process is particularly useful for recycling scrap terephthalate polyester products such as those produced from polyethylene terephthalate (PET), crystallized polyethylene terephthalate (CPET), glycol-modified polyethylene terephthalate copolyester (PETG), polybutylene terephthalate (PBT), polycyclohexanedimethylene terephthalate (PCT), as well as the acid- and glycol-modified copolyesters of PCT, respectively PCTA and PCTG.

REFERENCES:
patent: 3037048 (1962-05-01), Lotz
patent: 4578502 (1986-03-01), Cudmore
patent: 4929749 (1990-05-01), Gupta et al.

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