Production method for poly(vinyl alcohol)
US-2020157289-A1 · May 21, 2020 · US
Vinyl alcohol polymer and cement slurry comprising same
US10995252B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10995252-B2 |
| Application number | US-202016826133-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 20, 2020 |
| Priority date | Feb 22, 2018 |
| Publication date | May 4, 2021 |
| Grant date | May 4, 2021 |
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- Title
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Abstract
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Provided is a vinyl alcohol polymer having good fluid loss reducing performance. The vinyl alcohol polymer is a saponified product of a copolymer of a vinyl ester monomer and a multifunctional monomer, and has a degree of saponification of 70 to 95 mol % and a viscosity-average degree of polymerization of 1000 to 10000.
First claim
Opening claim text (preview).
The invention claimed is: 1. A vinyl alcohol polymer, wherein the vinyl alcohol polymer is a saponified product of a copolymer of a vinyl acetate monomer and a multifunctional monomer, the vinyl alcohol polymer has a degree of saponification of 70 to 95 mol% and a viscosity-average degree of polymerization of 1000 to 10000, a structural unit derived from the multifunctional monomer in the vinyl alcohol polymer is 0.001 to 0.0230 mol % per 100 mol % of a structural unit derived from the vinyl ester monomer, and the multifunctional monomer includes two or more allyl groups. 2. The vinyl alcohol polymer according to claim 1 , wherein the multifunctional monomer further includes a carbonyl group or an amide group. 3. The vinyl alcohol polymer according to claim 1 , wherein the multifunctional monomer is triallyl isocyanurate. 4. The vinyl alcohol polymer according to claim 1 , wherein a content of the vinyl alcohol polymer having a particle size of 75 μm or less is 30 mass % or less, and a content of the vinyl alcohol polymer having a particle size of 500 μm or more is 10 mass % or less. 5. A cement slurry comprising 0.01 to 30% bwoc of the vinyl alcohol polymer according to claim 1 .
Assignees
Inventors
Classifications
- C09K8/467Primary
containing additives for specific purposes · CPC title
Vinyl acetate · CPC title
obtained by reactions only involving carbon-to-carbon unsaturated bonds {(C04B24/243 takes precedence)} · CPC title
Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title
Polyvinylacetals · CPC title
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- What does patent US10995252B2 cover?
- Provided is a vinyl alcohol polymer having good fluid loss reducing performance. The vinyl alcohol polymer is a saponified product of a copolymer of a vinyl ester monomer and a multifunctional monomer, and has a degree of saponification of 70 to 95 mol % and a viscosity-average degree of polymerization of 1000 to 10000.
- Who is the assignee on this patent?
- Denka Company Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09K8/467. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 04 2021 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).