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Process for reducing diethylene glycol formation in polyethylene terephthalate
US10351668B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10351668-B2 |
| Application number | US-201715795679-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 27, 2017 |
| Priority date | Jun 30, 2017 |
| Publication date | Jul 16, 2019 |
| Grant date | Jul 16, 2019 |
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Abstract
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A process for reducing diethylene glycol formation in polyethylene terephthalate includes (a) subjecting a mixture of bis(2-hydroxyethyl)terephthalate with aromatic polycarboxylic acid to an esterification reaction, and (b) subjecting the esterification reaction product to polycondensation.
First claim
Opening claim text (preview).
What is claimed is: 1. A process for reducing diethylene glycol formation in polyethylene terephthalate, comprising the steps of: (a) subjecting a mixture of bis(2-hydroxyethyl)terephthalate, which is a monomer, and terephthalic acid to an esterification reaction in the absence of a catalyst and ethylene glycol; and (b) subjecting the esterification reaction product to polycondensation to form polyethylene terephthalate. 2. The process according to claim 1 , wherein, in step (a), a molar ratio of bis(2-hydroxyethyl)terephthalate to terephthalic acid ranges from 20:1 to 1:1. 3. The process according to claim 2 , wherein, in step (a), a molar ratio of bis(2-hydroxyethyl)terephthalate to terephthalic acid ranges from 6.5:1 to 1:1. 4. The process according to claim 1 , wherein the esterification reaction is performed in normal pressure. 5. The process according to claim 1 , wherein step (b) is performed in the presence of a catalyst. 6. The process according to claim 5 , wherein the catalyst is selected from the group consisting of antimony trioxide, antimony(III) acetate, ethylene glycol antimony, titanium isopropoxide, titanium butoxide, germanium oxide, dibutyltin oxide, n-butyl hydroxytin oxide, and combinations thereof.
Assignees
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Classifications
- C08G63/866Primary
Antimony or compounds thereof · CPC title
- C08G63/183Primary
Terephthalic acids · CPC title
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Frequently asked questions
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- What does patent US10351668B2 cover?
- A process for reducing diethylene glycol formation in polyethylene terephthalate includes (a) subjecting a mixture of bis(2-hydroxyethyl)terephthalate with aromatic polycarboxylic acid to an esterification reaction, and (b) subjecting the esterification reaction product to polycondensation.
- Who is the assignee on this patent?
- Far Eastern New Century Corp
- What technology area does this patent fall under?
- Primary CPC classification C08G63/866. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 16 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).