Water soluble film, packets employing the film, and methods of making and using same
US-2016280869-A1 · Sep 29, 2016 · US
Vinyl alcohol-vinyl acetate copolymer
US10711081B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10711081-B2 |
| Application number | US-201716098478-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 8, 2017 |
| Priority date | May 9, 2016 |
| Publication date | Jul 14, 2020 |
| Grant date | Jul 14, 2020 |
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- Title
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Abstract
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The present invention provides a vinyl alcohol-vinyl acetate copolymer having excellent solubility and a method for producing a vinyl alcohol-vinyl acetate copolymer. Provided is a vinyl alcohol-vinyl acetate copolymer including a unit of vinyl alcohol and a unit of vinyl acetate, the vinyl alcohol-vinyl acetate copolymer having a randomness value R of 0.5 or higher, the randomness value R being obtained using the following equation (1): R = 1 L A + 1 L O ( 1 ) where L O represents a mean chain length of the unit of vinyl alcohol and L A represents a mean chain length of the unit of vinyl acetate.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a vinyl alcohol-vinyl acetate copolymer comprising a unit of vinyl alcohol and a unit of vinyl acetate, wherein the vinyl alcohol-vinyl acetate copolymer has a randomness value R of 0.5 or higher, and wherein the randomness value R is obtained using the following equation (1): R = 1 L A + 1 L O ( 1 ) where L O represents a mean chain length of the unit of vinyl alcohol and L A represents a mean chain length of the unit of vinyl acetate, the method comprising the step of: transesterification of polyvinyl acetate or a raw material vinyl alcohol-vinyl acetate copolymer using a dianionic zincate complex represented by the following formula (2): t -Bu n R 4-n ZnM m (2) where n represents an integer of 1 to 4, m represents 1 or 2, Rs may be the same as or different from one another when n represents 1 or 2 and each represent a C1-C8 alkyl, alkenyl, aryl, or arylalkyl group, and M represents lithium or magnesium. 2. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the dianionic zincate complex is dilithium tetra-t-butylzincate. 3. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the transesterification is performed in a homogeneous system. 4. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the transesterification is performed in a heterogeneous system. 5. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the vinyl alcohol-vinyl acetate copolymer has a mean chain length L O of the unit of vinyl alcohol of 1 or longer. 6. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the vinyl alcohol-vinyl acetate copolymer has a mean chain length L A of the unit of vinyl acetate of 1 or longer. 7. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 1 , wherein the vinyl alcohol-vinyl acetate copolymer comprises the unit of vinyl alcohol in an amount of 0.2 to 99.8 mol %. 8. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 2 , wherein the vinyl alcohol-vinyl acetate copolymer has a mean chain length L O of the unit of vinyl alcohol of 1 or longer. 9. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 2 , wherein the vinyl alcohol-vinyl acetate copolymer has a mean chain length L A of the unit of vinyl acetate of 1 or longer. 10. The method for producing the vinyl alcohol-vinyl acetate copolymer according to claim 2 , wherein the vinyl alcohol-vinyl acetate copolymer comprises the unit of vinyl alcohol in an amount of 0.2 to 99.8 mol %.
Assignees
Inventors
Classifications
- C08F216/06Primary
Polyvinyl alcohol {; Vinyl alcohol} · CPC title
Hydrolysis · CPC title
Esterification · CPC title
- C08F216/38Primary
by an acetal or ketal radical · CPC title
Vinyl acetate · CPC title
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- What does patent US10711081B2 cover?
- The present invention provides a vinyl alcohol-vinyl acetate copolymer having excellent solubility and a method for producing a vinyl alcohol-vinyl acetate copolymer. Provided is a vinyl alcohol-vinyl acetate copolymer including a unit of vinyl alcohol and a unit of vinyl acetate, the vinyl alcohol-vinyl acetate copolymer having a randomness value R of 0.5 or higher, the randomness value R bein…
- Who is the assignee on this patent?
- Univ Tokushima, Sekisui Chemical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F216/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 14 2020 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).