Patent ID: 7928183

Claim:
A polyester comprising at least one partially acylated polyhydroxylated compound selected from the group consisting of glycerol polycarbonates, specific polyglycerols, [(α-hydroxymethyl) oxyethylene/(α-hydroxymethyl)ethylene carbonate] copolymers, [(α-alkyl) oxyethylene/(α-alkyl)ethylene carbonate] copolymers, and [(α-hydroxyalkyl) oxyethylene/(α-hydroxyalkyl) oxyethylene] copolymers, wherein the polyhydroxylated compounds of this group are taken alone or in a mixture, and wherein the polyesters of the partially acylated compounds, alone or in a mixture, satisfy the following general formulas in which k is the acylation rate between 0.01 and 1, according to: ii. for the polyesters of the specific partially acylated polyglycerols: wherein “n” and “p” are each an integer equal to at least 2 and have a value ranging from 2 to 150; iii. for the polyesters of the partially acylated [(α-hydroxymethyl) oxyethylene/α-hydroxymethyl)ethylene carbonate] copolymers: wherein “x” is an integer equal to at least 2 and has a value ranging from 2 to 100, wherein “y” is an integer equal to at least 2 and has a value ranging from 2 to 100, and wherein “q” is equal to at least 2 and has a value ranging from 2 to 100; iv. for the polyesters of [(α-alkyl) oxyethylene/(α-alkyl)ethylene carbonate] copolymers in which at least one of α-alkyl 1 or α-alkyl 2 is a partially acylated C 1 to C 4 hydroxylated hydrocarbon chain, while the other α-alkyl is H or a C 1 to C 4 hydrocarbon chain: wherein “z” is an integer equal to at least 2 and has a value ranging from 2 to 100, “w” is an integer equal to at least 2 and has a value ranging from 2 to 100, and “s” is an integer equal to at least 2 and has a value ranging from 2 to 100; v. for the polyesters of the partially acylated [(α-alkyl) 3 oxyethylene/(α-hydroxyalkyl) 4 oxyethylene] copolymers represented by the general formula: wherein “a” is an integer equal to at least 2 and has a value ranging from 2 to 100, “b” is an integer equal to at least 2 and has a value ranging from 2 to 100, and “u” is an integer equal to at least 2 and has a value ranging from 2 to 100, while α-alkyl 3 and α-alkyl 4 are H or a C 1 to C 4 hydrocarbon chain, and in which R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 and R 9 are independently selected from the group consisting of saturated or unsaturated C 1 to C 43 hydrocarbon chains, and are optionally functionalised by hydroxyl and/or epoxy functions.