Rubber additive, rubber composition and pneumatic tire using same
US-2020263001-A1 · Aug 20, 2020 · US
Crystals and production method for the same
US12240796B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12240796-B2 |
| Application number | US-202017786731-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 18, 2020 |
| Priority date | Dec 20, 2019 |
| Publication date | Mar 4, 2025 |
| Grant date | Mar 4, 2025 |
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Abstract
Official abstract text for this publication.
An object of the present invention is to provide novel crystals. Provided are crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.1±0.2°.
First claim
Opening claim text (preview).
The invention claimed is: 1. Crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.1±0.2°. 2. Crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising characteristic peaks at least at angles of diffraction (2θ) of 6.1±0.2°, 17.7±0.2°, 17.9±0.2° and 19.1±0.2°. 3. The crystals according to claim 2 , wherein the crystals have an X-ray powder diffraction pattern comprising characteristic peaks at least at angles of diffraction (2θ) of 6.1±0.2°, 17.7±0.2°, 17.9±0.2°, 18.2±0.2°, 19.1±0.2° and 23.8±0.2°. 4. The crystals according to claim 1 , wherein the crystals have a melting point of 148° C. or more. 5. A rubber additive comprising the crystals according to claim 1 . 6. A rubber composition comprising the rubber additive according to claim 5 . 7. A tire comprising the rubber composition according to claim 6 . 8. A method for producing the crystals according to claim 1 , the method comprising bubbling oxygen gas or an oxygen-containing gas into a solution containing 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide. 9. A method for improving low heat build-up and/or processability of a rubber, the method comprising using the crystals according to claim 1 to improve low heat build-up and/or processability of a rubber. 10. The crystals according to claim 1 , wherein the crystals have a mean particle size at 50% (D 50 ) of 0.5 μm or more. 11. The crystals according to claim 10 , wherein the crystals have a mean particle size at 50% (D 50 ) of 0.5 μm to 50 μm. 12. The crystals according to claim 1 , wherein the crystals have at least one shape selected from the group consisting of a plate shape, a pillar shape and an acicular shape. 13. The crystals according to claim 12 , wherein the crystals have a plate shape.
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Classifications
Carboxylic acid hydrazides · CPC title
Crystalline forms, e.g. polymorphs · CPC title
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title
- C07C243/38Primary
with acylating carboxyl groups bound to carbon atoms of six-membered aromatic rings · CPC title
- C07C251/76Primary
to carbon atoms of a saturated carbon skeleton · CPC title
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- What does patent US12240796B2 cover?
- An object of the present invention is to provide novel crystals. Provided are crystals of 3-hydroxy-N′-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide having an X-ray powder diffraction pattern comprising a peak of maximum intensity at an angle of diffraction (2θ) of 6.1±0.2°.
- Who is the assignee on this patent?
- Otsuka Chemical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07C243/38. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 04 2025 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).