Method for preparing biodegradable polyester copolymer

• US 9,464,165 B2
• Filed: 07/30/2013
• Issued: 10/11/2016
• Est. Priority Date: 11/21/2012
• Status: Expired due to Fees

• Current Assignee: Lotte Fine Chemical Co., Ltd. (Lotte Chemical Corporation)
• Original Assignee: Lotte Fine Chemical Co., Ltd. (Lotte Chemical Corporation)
• Inventors: Choi, Soo Youn, Kim, Hee Soo, Kim, Ye Jin, Kim, Min Kyoung, Yun, Ki Chull
• Primary Examiner(s): BOYKIN, TERRESSA M
• Application Number:
  US14/443,448
• Publication Number:
  US 20150299384A1
• Time in Patent Office: 1,169 Days
• Field of Search: 528/193, 528/194, 528/196, 528/198, 528/271, 528/272, 528/296
• US Class Current: 1/1
• CPC Class Codes: C08G 63/127 Acids containing aromatic rings
• CPC Class Codes: C08G 63/20 Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
• CPC Class Codes: C08G 63/78 Preparation processes

Abstract

The present invention provides a method of preparing a polyester-based polymer and a polyester-based polymer prepared by the method. The method of preparing the polyester-based polymer includes a prepolymerization step of polymerizing a dicarboxylic acid compound (A), a diol compound (B), and an aromatic branching agent (C) at 160-220° C. to produce a prepolymer; and a condensation polymerization step of performing a condensation polymerization of the prepolymer at 200-250° C., under a vacuum pressure of 0.1 to 2 Torr.

Claims

1. A method of preparing a biodegradable polyester-based polymer including:

a prepolymerization step of polymerizing a dicarboxylic acid compound (A), a diol compound (B), and a branching agent (C), which is represented by Formula 1 below, at 160-220°

C. to produce a prepolymer; and

a condensation polymerization step of performing a condensation polymerization of the prepolymer at 200-250°

C., under a vacuum pressure of 0.1 to 2 Torr;

2. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the amount of the branching agent (C) used is 0.1 to 5 wt % with respect to a total weight of the dicarboxylic acid compound (A) and the diol compound (B).

3. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the ratio of the amount of the dicarboxylic acid compound (A) used to the amount of the diol compound (B) used is 1:

1 to 1;

4, based on the molar ratio.

4. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein, when two species of the dicarboxylic acid compound are used, the ratio between the amounts of the above two species is 1:

1 to 1;

1.3, based on the molar ratio.

5. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the branching agent (C) is used in the prepolymerization step in the form of being dispersed or dissolved in an aliphatic diol having three or more carbons.

6. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein X is a substituted or unsubstituted C₆-C₂₀ phenylene group.

7. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein Y is selected from the group consisting of a substituted or unsubstituted C₂-C₁₀ alkylene group and a substituted or unsubstituted C₆-C₂₀ phenylene group.

8. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the dicarboxylic acid compound (A) is one or more species selected from the group consisting of a substituted or unsubstituted C₄-C₁₀ aliphatic dicarboxylic acid, a derivative of the aliphatic dicarboxylic acid, a substituted or unsubstituted C₈-C₂₀ aromatic dicarboxylic acid, and a derivative of the aromatic dicarboxylic acid.

9. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the diol compound (B) is one or more species selected from the group consisting of a substituted or unsubstituted C₂-C₁₀ aliphatic diol, and a substituted or unsubstituted C₆-C₂₀ aromatic diol.

10. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the prepolymerization step is carried out in the presence of at least one of a catalyst and a thermostabilizer.

11. The method of preparing a biodegradable polyester-based polymer according to claim 1, wherein the prepolymerization step includes

a first prepolymerization step of polymerizing a first dicarboxylic acid compound and a diol compound to produce a first prepolymer, and

a second prepolymerization step of polymerizing the first prepolymer and a second dicarboxylic acid compound to produce a second prepolymer, and

wherein the branching agent (C) is used in at least one of the first prepolymerization step, the second prepolymerization step, and the condensation polymerization step.

12. A biodegradable polyester-based polymer prepared according to claim 1, having a value “

L”

of 80 to 100, a value “

a”

of −

1.0 to 2.0, and a value of “

b”

of −

0.7 to 3.0 in the L*a*b* color system.