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US 2022/0010052 A1Published application
Polyglycolic Acid Resin and Production Process Thereof
AssigneePujing Chemical Industry Co., Ltd.
InventorLei FENG
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Abstract
Disclosed is a branched polymer resin comprising repeating units of —(—OCH2-CO—)— or —(—CO—CH2O—)—, which is produced by ring-opening polymerization in the presence of structure regulators and optionally end-capping agents. The branched polymer resin exhibits a lower melt viscosity and a higher heat-stable temperature and suitable for melt processing.
Claims14
A polymer resin comprising one or more repeating units of —(—OCH2—CO—)— or —(—CO—CH2O—)— and one or more bonding units each selected from the group consisting of:
- (a) bonding unit 1 is,
- (b) bonding unit 2 is
- (c) bonding unit 3 is
- (d) bonding unit 4 is
- and
- (e) bonding unit 5 is
- wherein is a polymer segment consisting of a plurality of the repeating unit of —(—OCH2—CO—)— or —(—CO—CH2O—)—;
- R1, R2, R3, R4, R5 and R6 are each an aliphatic or aromatic group;
- wherein bonding unit (a) has 3-20 arms, and each arm (i.e., each of n1, n2 . . . ni) may have 1-2,000, preferably 10-1,000, repeating units of —(—OCH2—CO—)— or —(—CO—CH2O—)—;
- wherein each bonding unit is linked with a repeating unit or another bonding unit via covalent bond;
- and
- wherein the polymer resin has a mean-square radius of gyration of 10-80 nm as measured in hexafluoroisopropanol at 25° C.
9 more elements
Dependencies are inferred from the claim text.