US12084526B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12084526-B2 |
| Application number | US-201917417589-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 26, 2019 |
| Priority date | Dec 27, 2018 |
| Publication date | Sep 10, 2024 |
| Grant date | Sep 10, 2024 |
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A vinyl alcohol-based polymer according to one embodiment of the present invention has an integral value (e) of 0.8 to 20 in the case when a sum of the following integral value (a) to (e) is 100 in a 1H-NMR spectrum(a) integral value of peak confirmed at 5.70 to 5.96 ppm(b) integral value of peak confirmed at 5.97 to 6.63 ppm(c) integral value of peak confirmed at 6.64 to 7.55 ppm(d) integral value of peak confirmed at 7.56 to 7.81 ppm(e) integral value of peak confirmed at 7.82 to 8.04 ppm.
Opening claim text (preview).
The invention claimed is: 1. A vinyl alcohol-based polymer, having a value defined by the following integral value (e) of 0.8 to 20 in the case when a sum of the following integral value (a) to (e) is 100 in a 1 H-NMR spectrum (a) integral value of peak confirmed at 5.70 to 5.96 ppm (b) integral value of peak confirmed at 5.97 to 6.63 ppm (c) integral value of peak confirmed at 6.64 to 7.55 ppm (d) integral value of peak confirmed at 7.56 to 7.81 ppm (e) integral value of peak confirmed at 7.82 to 8.04 ppm. 2. The vinyl alcohol-based polymer according to claim 1 , wherein a degree of saponification is 65 to 80 mol %, a block character of a remaining ester group is 0.45 to 0.62, and a ratio a1/a2 of an absorbance a1 of a 0.1 mass % aqueous solution at a wavelength of 280 nm and an absorbance a2 of the aqueous solution at a wavelength of 320 nm is 1.6 or less. 3. The vinyl alcohol-based polymer according to claim 1 , wherein a ratio (Mw/Mn) of a weight-average molecular weight Mw to a number-average molecular weight Mn is 2.6 to 14. 4. The vinyl alcohol-based polymer according to claim 1 , wherein a ratio of diad/triad of a remaining ester group is 0.7 to 1.3 and a ratio of diad/triad of a hydroxyl group is 2.0 to 3.5. 5. The vinyl alcohol-based polymer according to claim 1 , wherein a remaining ester group is an acetoxy group. 6. The vinyl alcohol-based polymer according to claim 1 , wherein a viscosity of a 4 mass % aqueous solution is 5 to 9 cP. 7. The vinyl alcohol-based polymer according to claim 1 , wherein a degree of yellowness (YI) of a 4 mass % aqueous solution is 30 to 80. 8. The vinyl alcohol-based polymer according to claim 1 , wherein when an aqueous solution having a concentration of the vinyl alcohol-based polymer of 7 mass % obtained by dissolving at 5° C. for 12 hours is filtered with a 200 mesh filter, a component remaining on the filter as undissolved matter is less than 0.1%. 9. The vinyl alcohol-based polymer according to claim 1 , which is used as a dispersant for polyvinyl chloride suspension polymerization. 10. A resin particle composed of the vinyl alcohol-based polymer according to claim 1 . 11. The resin particle according to claim 10 , wherein 95% or more of the particles have a particle size of 1.7 mm or more. 12. A vinyl alcohol-based polymer, having a value defined by the following integral value (c) of 30 to 50 and a value defined by the following integral value (d) of 0.8 to 10 in the case when a sum of the following integral value (a) to (e) is 100 in a 1 H-NMR spectrum (a) integral value of peak confirmed at 5.70 to 5.96 ppm (b) integral value of peak confirmed at 5.97 to 6.63 ppm (c) integral value of peak confirmed at 6.64 to 7.55 ppm (d) integral value of peak confirmed at 7.56 to 7.81 ppm (e) integral value of peak confirmed at 7.82 to 8.04 ppm. 13. A resin particle composed of the vinyl alcohol-based polymer according to claim 12 . 14. The resin particle according to claim 13 , wherein 95% or more of the particles have a particle size of 1.7 mm or more.
Vinyl chloride · CPC title
Oxidation · CPC title
with the aid of macromolecular dispersing agents · CPC title
Suspension polymerisation · CPC title
Polyvinyl alcohol {; Vinyl alcohol} · CPC title
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