Dispersion stabilizer for suspension polymerization and method for producing vinyl resin
US-9834629-B1 · Dec 5, 2017 · US
Particulate polyvinyl alcohol, process for making and uses of the same
US10626203B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10626203-B2 |
| Application number | US-201816139312-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 24, 2018 |
| Priority date | Mar 8, 2016 |
| Publication date | Apr 21, 2020 |
| Grant date | Apr 21, 2020 |
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- Title
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Abstract
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The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof.
First claim
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We claim: 1. A polyvinyl alcohol composition of particulate agglomerated polyvinyl alcohol particles, wherein: (1) the polyvinyl alcohol is a hydrolyzed polymer of a monomer component consisting essentially of vinyl acetate and, optionally, up to about 10 mol% of one or more acrylate monomers, with a degree of polymerization of from about 400 to about 10000, and a degree of hydrolysis of about 93% or greater; and (2) the particulate agglomerated polyvinyl alcohol particles has a D(90) particle size of from about 1 μm to about 1000 μm and a % warm-water (35° C.) solubles of about 5% or greater. 2. The polyvinyl alcohol composition of claim 1 , wherein the polyvinyl alcohol composition is produced in a slurry alcoholysis process with a heat treatment step, and the polyvinyl alcohol is produced at 50° C. or less in the heat treatment step and has a crystallinity reduced by about 2% to about 20% as compared to a polyvinyl alcohol produced under the same conditions except at 135° C. in the heat treatment step. 3. The polyvinyl alcohol composition of claim 2 , wherein the polyvinyl alcohol is produced at 50° C. or less in the heat treatment step and has a crystallinity reduced by about 2% to about 20% as compared to a polyvinyl alcohol produced under the same conditions except at 110° C. in the heat treatment step. 4. A composition comprising a solution of the polyvinyl alcohol composition of claim 1 dissolved in water. 5. The composition of claim 4 , wherein the composition is a paper inner sizing composition or a paper coating composition.
Assignees
Inventors
Classifications
Polyvinyl alcohol {; Vinyl alcohol} · CPC title
Processes of treating or compounding macromolecular substances · CPC title
Vinyl acetate · CPC title
Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters · CPC title
Powdering or granulating · CPC title
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Frequently asked questions
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- What does patent US10626203B2 cover?
- The present invention relates generally to a polyvinyl alcohol composition having higher amorphous polyvinyl alcohol polymer content and various end uses thereof.
- 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 Apr 21 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).