Abstract: The present invention provides an aliphatic polyester, a polyester composition containing the same, and use thereof. The aliphatic polyester includes a dicarboxylic acid residue, a diol residue, and a branching agent residue; the dicarboxylic acid residue includes the following residues: a1) based on a total molar percentage content of a1) and a2) as 100 mol %, 71-89 mol % of a succinic acid residue; and a2) based on the total molar percentage content of a1) and a2) as 100 mol %, 11-29 mol % of a sebacic acid residue; the diol residue is selected from a 1,4-butanediol residue with a molar content at least equal to that of the dicarboxylic acid residue; and based on a total mass of the aliphatic polyester as 100 wt %, a mass percentage content of the branching agent residue is 0.09-0.22 wt %. The aliphatic polyester solves the problem of low heat sealing strength of aliphatic polyesters.

Abstract: The present invention provides a bio-based succinic acid composition, a preparation method therefor, and a polyester prepared therefrom. The bio-based succinic acid composition includes bio-based succinic acid and a metal ion; and a mass content of the metal ion in the bio-based succinic acid composition is 10-350 ppm. In the present invention, by adopting the bio-based succinic acid composition containing the metal ion as a raw material for the polyester and controlling the content of the metal ion in the bio-based succinic acid composition within a specific range, the obtained polyester has better mechanical properties and heat retention stability.

Abstract: A biodegradable polyester composition, a preparation method therefor and use thereof are provided. The biodegradable polyester composition of the present invention includes a biodegradable polyester and a titanium element. Polymerizable monomers of the biodegradable polyester include: an aromatic dicarboxylic acid or an esterified product thereof, or a mixture thereof; an aliphatic dicarboxylic acid or an esterified product thereof, or a mixture thereof; a dihydroxy compound; and a chain extender. A content of the titanium element in the biodegradable polyester composition is 55-86 ppm; and an acid number of the biodegradable polyester composition is 1.10-1.96 mg KOH/g.

Abstract: An aliphatic-aromatic polyester composition, a polyester fiber, a preparation method therefor and use thereof are provided. The aliphatic-aromatic polyester composition includes the following components: i) an aliphatic-aromatic polyester based on aliphatic and aromatic dicarboxylic acids and an aliphatic dihydroxy compound; and ii) a titanium element, wherein calculated based on a weight of the aliphatic-aromatic polyester composition, a content of the titanium element is 55-88 ppm, and an acid number of the aliphatic-aromatic polyester composition is ?0.84 mg KOH/g according to the standard DIN EN 12634-1998.