This low crystallinity polyester resin for producing large containers has high transparency, high viscosity and low melting point. For example: PTA, EG and modifiers with a mole fraction of 0.5% to 23% (by PTA) (eg: isophthalic acid, 1, 42 cyclohexanedimethanol, naphthalenedicarboxylic acid, o-benzene Dicarboxylic acid, bisphenols and their alkyl derivatives) are reacted to obtain a low crystallinity polyester resin having an intrinsic viscosity of 0.5 to 1.0 dL/g. This polyester can be used to produce large bottles with a capacity of 3.78-37.85L and a thickness of 300μm to 2mm. Source: Polyester Industry