Nitrile rubber composition, latex composition of highly saturated nitrile rubber, and cross-linked rubber
US-2017327672-A1 · Nov 16, 2017 · US
Carboxyl group-containing nitrile rubber, method for production same, crosslinkable nitrile rubber composition, and crosslinked rubber
US11286324B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11286324-B2 |
| Application number | US-201716471009-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 19, 2017 |
| Priority date | Dec 27, 2016 |
| Publication date | Mar 29, 2022 |
| Grant date | Mar 29, 2022 |
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Abstract
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A carboxyl group-containing nitrile rubber comprising an α,β-ethylenically unsaturated nitrile monomer unit in a content of 5 to 60 wt % and having an iodine value of 120 or less, wherein the carboxyl group-containing nitrile rubber has a polymer Mooney viscosity (ML1+4, 100° C.) of 60 or less and a polymer pH of 7 or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. A carboxyl group-containing nitrile rubber comprising an α,β-ethylenically unsaturated nitrile monomer unit in a content of 5 to 60 wt %, and an α,β-ethylenically unsaturated monocarboxylic acid monomer unit in a content of 13 to 53 wt %, and having an iodine value of 120 or less, wherein the carboxyl group-containing nitrile rubber has a polymer Mooney viscosity (ML1+4, 100° C.) of 60 or less and a polymer pH of 7 or less, wherein a content of sodium in the carboxyl group-containing nitrile rubber is from 300 ppm to 10,000 ppm by weight. 2. The carboxyl group-containing nitrile rubber according to claim 1 , comprising a carboxyl group-containing monomer unit in a content of 1 to 30 wt %. 3. The carboxyl group-containing nitrile rubber according to claim 1 , comprising a conjugated diene monomer unit in a content of 20 to 89.9 wt %. 4. A cross-linkable nitrile rubber composition comprising the carboxyl group-containing nitrile rubber according to claim 1 and a cross-linking agent. 5. A cross-linked rubber prepared by cross-linking the cross-linkable nitrile rubber composition according to claim 4 . 6. A method for producing the carboxyl group-containing nitrile rubber according to claim 1 , comprising adding a salt of a monovalent cation to a latex of the carboxyl group-containing nitrile rubber to coagulate the carboxyl group-containing nitrile rubber. 7. The method for producing the carboxyl group-containing nitrile rubber according to claim 6 , wherein the salt is sodium chloride, sodium nitrate, or sodium sulfate. 8. The method for producing the carboxyl group-containing nitrile rubber according to claim 6 , wherein a pH of the latex is 5.5 or less. 9. The method for producing the carboxyl group-containing nitrile rubber according to claim 6 , further comprising, after the coagulation of the carboxyl group-containing nitrile rubber, water-washing a water-containing crumb of the carboxyl group-containing nitrile rubber obtained by coagulation.
Assignees
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Classifications
Chemical modification of rubber · CPC title
Purification · CPC title
Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title
- C08F236/06Primary
Butadiene · CPC title
- C08F236/12Primary
with nitriles · CPC title
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- What does patent US11286324B2 cover?
- A carboxyl group-containing nitrile rubber comprising an α,β-ethylenically unsaturated nitrile monomer unit in a content of 5 to 60 wt % and having an iodine value of 120 or less, wherein the carboxyl group-containing nitrile rubber has a polymer Mooney viscosity (ML1+4, 100° C.) of 60 or less and a polymer pH of 7 or less.
- Who is the assignee on this patent?
- Zeon Corp
- What technology area does this patent fall under?
- Primary CPC classification C08F236/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 29 2022 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).