C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 69/82 (2006.01) B01J 31/04 (2006.01) C07C 29/128 (2006.01) C07C 31/20 (2006.01) C07C 67/02 (2006.01) C07C 67/03 (2006.01) C08G 63/183 (2006.01)
Patent
CA 2104253
Abstract of the disclosure Process for the preparation of monomeric terephthalic diesters and diols from polyesters The invention relates to a novel process for the prepara- tion of terephthalic diesters and diols from polyesters. The process comprises depolymerization of the polyester in the presence of transesterification catalysts for said polyester and in the presence of an ester and subsequent transesterification of the reaction mixture to give the terephthalic diester by reaction with a monohydric alcohol. The novel process allows the starting components of polyesters to be recovered rapidly and under mild reaction conditions.
Hertenstein Ulrich
Neugebauer Rudolf
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoechst Aktiengesellschaft
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