US 11,807,886 B2
Process for the preparation of copolymers derived from 2,4- or 2,5-pyridinedicarboxylic acid
Paul Law, Southampton (GB); Paul Mines, Southampton (GB); and Timothy Bugg, Coventry (GB)
Assigned to BIOME BIOPLASTICS LIMITED, Southampton (GB)
Filed by Biome Bioplastics Limited, Southampton (GB)
Filed on Mar. 10, 2020, as Appl. No. 16/814,794.
Application 16/814,794 is a division of application No. 15/580,254, granted, now 10,612,057, previously published as PCT/EP2016/063779, filed on Jun. 15, 2016.
Claims priority of application No. 1510461 (GB), filed on Jun. 15, 2015.
Prior Publication US 2020/0208183 A1, Jul. 2, 2020
Int. Cl. C12P 17/12 (2006.01); C12P 7/44 (2006.01); C08G 63/685 (2006.01); C12P 7/50 (2006.01); C07D 213/803 (2006.01); C08G 63/78 (2006.01); C12N 9/02 (2006.01); C12P 7/42 (2006.01)
CPC C12P 17/12 (2013.01) [C07D 213/803 (2013.01); C08G 63/6856 (2013.01); C08G 63/78 (2013.01); C12N 9/0069 (2013.01); C12P 7/42 (2013.01); C12P 7/44 (2013.01); C12P 7/50 (2013.01); C12Y 113/11 (2013.01)] 15 Claims
 
1. A method comprising combining:
(a) at least one pyridinedicarboxylic acid (PDCA) or a mono- or diester of pyridinedicarboxylic acid;
(b) at least one diol; and
(c) optionally, at least one aliphatic dicarboxylic acid or a mono- or diester derivative thereof,
under conditions suitable for condensation, transesterification or polymerization to produce a copolymer comprising residues of (a), (b) and optionally (c), wherein:
the method is catalyzed by an organic acid, an inorganic acid or a metal;
the method comprises holding (a), (b) and optionally (c) at a temperature of about 60° C. to about 250° C.; and
the method comprises holding (a), (b) and optionally (c) at a pressure of about 1 mbar to about 500 mbar.