Method for producing carboxyl-group-containing nitrile rubber
US-2020031955-A1 · Jan 30, 2020 · US
Carboxyl group-containing nitrile rubber
US12110348B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12110348-B2 |
| Application number | US-201917419166-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 25, 2019 |
| Priority date | Dec 28, 2018 |
| Publication date | Oct 8, 2024 |
| Grant date | Oct 8, 2024 |
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Abstract
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A carboxyl group-containing nitrile rubber having an iodine value of 120 or less, wherein the content of sodium is 1500 ppm by weight or less, the total content of calcium, magnesium, and aluminum is 350 ppm by weight or less, and the storage elastic modulus at 140° C. is 350 kPa or more.
First claim
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The invention claimed is: 1. A carboxyl group-containing nitrile rubber having an iodine value of 120 or less, wherein the carboxyl group-containing nitrile rubber does not contain a polymer flocculant, a content of sodium is 1500 ppm by weight or less, a total content of calcium, magnesium, and aluminum is 350 ppm by weight or less, and a storage elastic modulus at 140° C. is 350 kPa or more. 2. The carboxyl group-containing nitrile rubber according to claim 1 , wherein a methyl ethyl ketone insoluble content is 40 w % or less. 3. The carboxyl group-containing nitrile rubber according to claim 1 , wherein the content of sodium is 10 ppm by weight or more. 4. The carboxyl group-containing nitrile rubber according to claim 1 , wherein the total content of calcium, magnesium, and aluminum is 1.5 ppm by weight or more. 5. The carboxyl group-containing nitrile rubber according to claim 1 comprising an α,ß-ethylenically unsaturated nitrile monomer unit and an α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit. 6. The carboxyl group-containing nitrile rubber according to claim 5 comprising the α,β-ethylenically unsaturated nitrile monomer unit, the α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit, a conjugated diene monomer unit which includes a saturated unit thereof, and an α,β-ethylenically unsaturated monocarboxylic acid ester monomer unit. 7. A rubber composition obtained by blending a cross-linking agent with the carboxyl group-containing nitrile rubber according to claim 1 . 8. A cross-linked rubber obtained by cross-linking the rubber composition according to claim 7 .
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- What does patent US12110348B2 cover?
- A carboxyl group-containing nitrile rubber having an iodine value of 120 or less, wherein the content of sodium is 1500 ppm by weight or less, the total content of calcium, magnesium, and aluminum is 350 ppm by weight or less, and the storage elastic modulus at 140° C. is 350 kPa or more.
- Who is the assignee on this patent?
- Zeon Corp
- What technology area does this patent fall under?
- Primary CPC classification C08C19/02. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 08 2024 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).