Polymer membrane for water treatment and method for manufacture of same
US-9193815-B2 · Nov 24, 2015 · US
Polyvinyl alcohol powder and method for producing same
US10125203B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10125203-B2 |
| Application number | US-201515315420-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 3, 2015 |
| Priority date | Jun 4, 2014 |
| Publication date | Nov 13, 2018 |
| Grant date | Nov 13, 2018 |
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- Title
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Abstract
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The present invention is characterized by being a polyvinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to 1000 μm in particle diameter of more than 0.60 and less than 0.80, and having a content of the portion ranging from 500 to 1000 μm in particle diameter of 35 to 70% by mass. Accordingly, a polyvinyl alcohol powder is provided, that is good in anti-scattering property, superior in solubility in preparing an aqueous solution from the powder, and capable of reducing transport costs due to its large specific gravity.
First claim
Opening claim text (preview).
The invention claimed is: 1. A poly vinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to 1000 μm in particle diameter of more than 0.60 and less than 0.80, and having a content of the portion ranging from 500 to 1000 μm in particle diameter of 35 to 70% by mass. 2. The polyvinyl alcohol powder according to claim 1 , having a viscosity-average degree of polymerization of 200 to 5000 and a degree of saponification of 50 to 99.99 mol %. 3. The poly vinyl alcohol powder according to claim 1 , wherein the bulk specific gravity (g/ml) of the portion ranging from 500 to 1000 μm in particle diameter is 0.62 or more. 4. The polyvinyl alcohol powder according to claim 1 , wherein the content of the portion ranging from 500 to 1000 μm in particle diameter is 40% by mass or more. 5. A method for producing the polyvinyl alcohol powder of claim 1 , comprising: an introduction step of introducing a saponification catalyst into a central portion of a flow path in which a saponification raw solution comprising a polyvinyl ester and an organic solvent flows, and a mixing step of mixing the saponification raw solution with the introduced saponification catalyst using a static mixer at a shear rate of 5 to 90 s −1 .
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- What does patent US10125203B2 cover?
- The present invention is characterized by being a polyvinyl alcohol powder having an average particle diameter of 100 to 2000 μm as measured by optical microscopic observation at a humidity of 65% RH and a temperature of 25° C., having a bulk specific gravity (g/ml) of a portion ranging from 500 to 1000 μm in particle diameter of more than 0.60 and less than 0.80, and having a content of the po…
- Who is the assignee on this patent?
- Kuraray Co
- What technology area does this patent fall under?
- Primary CPC classification C08F8/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 13 2018 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).