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US 12,351,679 B2Granted
Crystalline polyester resin and manufacturing method thereof
AssigneeSK Chemicals Co., Ltd.
InventorsDa-Young Hwang, Hyun-Woo Oh, Yoo Jin Lee
Life of this patent
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Abstract
The present invention relates to a crystalline polyester resin and to a process for preparing the same. Since the crystalline polyester resin has a crystallinity required in a molding process and/or a recycling process while fusion is minimized during the preparation process, it can have excellent productivity, moldability, recyclability, and the like.
Claims20
A crystalline polyester resin, which comprises a diol repeat unit derived from a diol component;
- and a dicarboxylic acid repeat unit derived from a dicarboxylic acid component, wherein, when the crystalline polyester resin is analyzed by differential scanning calorimetry (DSC) while the temperature is raised to 280° C. at a scan rate of 10° C./minute, two or more melting temperatures (Tm) appear, and the following Relationship 1 is satisfied:
- 4<X/Y<70 [Relationship 1]
- in Relationship 1, X is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at 200° C. or higher, and Y is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at lower than 200° C.
A process for preparing a crystalline polyester resin, which comprises:
- (1) polymerizing a diol component and a dicarboxylic acid component to prepare a polyester resin;
- and
- (2) subjecting the polyester resin to crystallization of one or more times,
- wherein, when the crystalline polyester resin is analyzed by differential scanning calorimetry (DSC) while the temperature is raised to 280° C. at a scan rate of 10° C./minute, two or more melting temperatures (Tm) appear, and the following Relationship 1 is satisfied:
- 4<X/Y<70 [Relationship 1]
- in Relationship 1, X is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at 200° C. or higher, and Y is the sum of the heats of fusion (ΔH) at the melting temperatures appearing at lower than 200° C.
3 more elements
Dependencies are inferred from the claim text.