Pneumatic tire, studless tire, method for manufacturing pneumatic tire, and method for manufacturing studless tire
US-9862814-B2 · Jan 9, 2018 · US
Modified natural rubber, process for producing same, rubber composition for tire, and pneumatic tire
US10131763B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10131763-B2 |
| Application number | US-201314437758-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 2, 2013 |
| Priority date | Feb 15, 2013 |
| Publication date | Nov 20, 2018 |
| Grant date | Nov 20, 2018 |
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Abstract
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The present invention provides a modified natural rubber having a good balance of improved fuel economy, heat-aging resistance, processability, and breaking resistance, and a method for producing such a rubber. The present invention also provides a tire rubber composition and a pneumatic tire which are prepared using the modified natural rubber. The present invention relates to a highly purified, modified natural rubber whose pH is adjusted to 2 to 7.
First claim
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The invention claimed is: 1. A modified natural rubber which has a phosphorus content of 200 ppm or less and whose pH is adjusted to 2 to 7, wherein the pH is determined by cutting 5 g of the modified natural rubber into cubes at most 2 mm on each side, immersing the cubes in 50 mL of distilled water and extracting them at 90° C. for 15 minutes under microwave irradiation, and then measuring the immersion water with a pH meter. 2. The modified natural rubber according to claim 1 , wherein the modified natural rubber has a Mooney viscosity ML (1+4) at 130° C. of 75 or less as measured in conformity with JIS K 6300:2001-1, and has a heat-aging resistance index defined by the following formula of 75 to 120%, Heat - aging resistance index ( % ) = Mooney viscosity of the modified natural rubber determined after 18 - hour heat treatment at 80 ∘ C . Mooney viscosity of the modified natural rubber before the treatment × 100. 3. A modified natural rubber which has a phosphorus content of 200 ppm or less and whose pH is 2 to 7, the modified natural rubber being obtained by removing non-rubber components from natural rubber, and treating the resultant rubber with an acidic compound, wherein the pH is determined by cutting 5 g of the modified natural rubber into cubes at most 2 mm on each side, immersing the cubes in 50 mL of distilled water and extracting them at 90° C. for 15 minutes under microwave irradiation, and then measuring the immersion water with a pH meter. 4. The modified natural rubber according to claim 3 , which has a heat-aging resistance index defined above of 75 to 120%. 5. The modified natural rubber according to claim 1 , which has a nitrogen content of 0.15% by mass or less. 6. The modified natural rubber according to claim 1 , which has a gel content measured as toluene-insolubles of 20% by mass or less. 7. A modified natural rubber which has a phosphorus content of 200 ppm or le
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- What does patent US10131763B2 cover?
- The present invention provides a modified natural rubber having a good balance of improved fuel economy, heat-aging resistance, processability, and breaking resistance, and a method for producing such a rubber. The present invention also provides a tire rubber composition and a pneumatic tire which are prepared using the modified natural rubber. The present invention relates to a highly purifie…
- Who is the assignee on this patent?
- Sumitomo Rubber Ind, Sumitomo Rubber Ind
- What technology area does this patent fall under?
- Primary CPC classification C08K3/36. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 20 2018 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).