Articles comprising copolyesters produced with germanium catalyst
US-2024376258-A1 · Nov 14, 2024 · US
Process for reducing diethylene glycol formation in polyethylene terephthalate
US2019002632A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2019002632-A1 |
| Application number | US-201715795679-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 27, 2017 |
| Priority date | Jun 30, 2017 |
| Publication date | Jan 3, 2019 |
| Grant date | — |
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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 with aromatic polycarboxylic acid to an esterification reaction; and (b) subjecting the esterification reaction product to polycondensation. 2 . The process according to claim 1 , wherein, in step (a), a molar ratio of bis(2-hydroxyethyl)terephthalate to aromatic polycarboxylic 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 aromatic polycarboxylic 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 the aromatic polycarboxylic acid is selected from the group consisting of aromatic dicarboxylic acid, aromatic tricarboxylic acid, aromatic tetracarboxylic acid, and combinations thereof. 6 . The process according to claim 5 , wherein the aromatic polycarboxylic acid is aromatic dicarboxylic acid. 7 . The process according to claim 6 , wherein the aromatic dicarboxylic acid is selected from the group consisting of terephthalic acid, isophthalic acid, phthalic acid, biphenyl-4,4′-dicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, and combinations thereof. 8 . The process according to claim 7 , wherein the aromatic dicarboxylic acid is terephthalic acid. 9 . The process according to claim 8 , wherein, in step (a), a molar ratio of bis(2-hydroxyethyl)terephthalate to terephthalic acid ranges from 6.5:1 to 1:1. 10 . The process according to claim 1 , wherein step (b) is performed in the presence of a catalyst. 11 . The process according to claim 10 , 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
- C08G63/183Primary
Terephthalic acids · CPC title
- C08G63/866Primary
Antimony or compounds thereof · CPC title
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- What does patent US2019002632A1 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 C08G63/183. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jan 03 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).