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US 12,668,564 B2Granted
Method for preparing bis(glycol)terephthalate and polyester resin using same
AssigneeSK Chemicals Co., Ltd.
InventorsYoung-Man Yoo, Eun-Yeong Hwang
Life of this patent
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Abstract
Through a transesterification reaction in which a predetermined amount of bis(2-hydroxyethyl)terephthalate relative to glycol is fed in a divided or continuous manner, bis(glycol)terephthalate with a low residual amount of an ethylene glycol derivative is prepared, and polyester engineering products or biodegradable polyester products with high crystallinity can be produced therefrom.
Claims10
A process for preparing a bis(glycol) terephthalate, which comprises:
- (1) feeding at least one glycol component having 3 or more carbon atoms to a reactor;
- and
- (2) feeding bis(2-hydroxyethyl) terephthalate to the reactor in a divided manner and carrying out a transesterification reaction,
- wherein the following Relationship (1) is satisfied:
- 1.
- ≤
- G
- /
- B
- ≤
- 3
- .
- 5
- (
- 1
- )
- in Relationship (1), G is the total number of moles of the at least one glycol component, and B is the total number of moles of the bis(2-hydroxyethyl) terephthalate, and
- wherein the bis(2-hydroxyethyl) terephthalate is introduced into the transesterification reaction in step (2) in a divided manner of two or more times, and the introduction ratio (R) of bis(2-hydroxyethyl) terephthalate according to Relationship (2) is 5 or more:
- R
- =
- G
- ×
- N
- B
- (
- 2
- )
- in Relationship (2), G is the total number of moles of the at least one glycol component, B is the total number of moles of the bis(2-hydroxyethyl) terephthalate, and N is the number of divided introductions of the bis(2-hydroxyethyl) terephthalate.
25 more elements
A process for preparing a polyester resin, which comprises:
- (1) feeding at least one glycol component having 3 or more carbon atoms to a reactor;
- (2) feeding bis(2-hydroxyethyl) terephthalate to the reactor in a divided or continuous manner and carrying out a transesterification reaction;
- and
- (3) subjecting the product of the transesterification reaction to a polycondensation reaction,
- wherein the following Relationship (1) is satisfied:
- 1.
- ≤
- G
- /
- B
- ≤
- 3
- .
- 5
- (
- 1
- )
- in Relationship (1), G is the total number of moles of the at least one glycol component, and B is the total number of moles of the bis(2-hydroxyethyl) terephthalate,
- wherein the bis(2-hydroxyethyl) terephthalate is introduced into the transesterification reaction in step (2) in a divided manner of two or more times, and the introduction ratio (R) of bis(2-hydroxyethyl) terephthalate according to Relationship (2) is 5 or more:
- R
- =
- G
- ×
- N
- B
- (
- 2
- )
- in Relationship (2), G is the total number of moles of the at least one glycol component, B is the total number of moles of the bis(2-hydroxyethyl) terephthalate, and N is the number of divided introductions of the bis(2-hydroxyethyl) terephthalate.
26 more elements
Dependencies are inferred from the claim text.