Production method for poly(vinyl alcohol)
US-2020157289-A1 · May 21, 2020 · US
Additive for oil well cement and cement slurry using said additive for oil well cement
US11046880B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11046880-B2 |
| Application number | US-201916649504-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 4, 2019 |
| Priority date | Feb 22, 2018 |
| Publication date | Jun 29, 2021 |
| Grant date | Jun 29, 2021 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
An additive for oil well cement contains a vinyl alcohol polymer and has good fluid loss reducing performance. The additive for oil well cement 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. An additive for oil well cement, comprising a vinyl alcohol polymer, wherein the vinyl alcohol polymer is a saponified product of a copolymer of a vinyl ester 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, and 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. 2. The additive for oil well cement according to claim 1 , wherein the multifunctional monomer includes a carbonyl group or an amide group. 3. The additive for oil well cement according to claim 1 , wherein the multifunctional monomer is triallyl isocyanurate. 4. The additive for oil well cement 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 additive for oil well cement according to claim 1 .
Assignees
Inventors
Classifications
Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title
- C09K8/44Primary
containing organic binders only · CPC title
containing hydraulic cements other than calcium sulfates · CPC title
Polyamides · CPC title
Cross-linked polymers · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11046880B2 cover?
- An additive for oil well cement contains a vinyl alcohol polymer and has good fluid loss reducing performance. The additive for oil well cement 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 C09K8/44. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 29 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).