Polyhydroxyalkanoate Copolymers Prepared by Ring-Opening Polymerization and Related Compositions and Articles
US-2024392063-A1 · Nov 28, 2024 · US
Production process of α-hydroxy acids
US8940934B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8940934-B2 |
| Application number | US-99978508-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 20, 2008 |
| Priority date | Jun 20, 2008 |
| Publication date | Jan 27, 2015 |
| Grant date | Jan 27, 2015 |
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Abstract
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An object of the present invention is to provide a production process of an α-hydroxy acid having a sufficient quality as a polymer raw material, which process does not produce a large amount of waste as a byproduct and is economical. The present invention provides a production process of an α-hydroxy acid having a step of adding a basic metal to an α-hydroxy acid ammonium salt to yield an α-hydroxy acid metal salt and a step of desalting the α-hydroxy acid metal salt to yield the α-hydroxy acid.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for producing an α-hydroxy acid, which comprises: (1) a step of bringing a basic metal into contact with an aqueous solution of an α-hydroxy acid ammonium salt to produce an α-hydroxy acid metal salt while (i) controlling a concentration of an α-hydroxy acid amide residue in the solution to 500 [weight ppm/α-hydroxy acid] or less, and (ii) simultaneously removing ammonia generated in this step from the aqueous solution into a gas phase portio…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C08G63/08Primary
Chemistry & Metallurgy · mapped topic
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- What does patent US8940934B2 cover?
- An object of the present invention is to provide a production process of an α-hydroxy acid having a sufficient quality as a polymer raw material, which process does not produce a large amount of waste as a byproduct and is economical. The present invention provides a production process of an α-hydroxy acid having a step of adding a basic metal to an α-hydroxy acid ammonium salt to yield a…
- Who is the assignee on this patent?
- Okamoto Makoto, Date Hideki, Asahi Kasei Chemicals Corp
- What technology area does this patent fall under?
- Primary CPC classification C08G63/08. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jan 27 2015 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).