Rubber additive, rubber composition and pneumatic tire using same
US-2020263001-A1 · Aug 20, 2020 · US
Crystals of 3-hydroxy-N'-(1,3-dimethylbutylidene)-2-naphthoic acid hydrazide and production method for the same
US12404233B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12404233-B2 |
| Application number | US-202017786765-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 18, 2020 |
| Priority date | Dec 20, 2019 |
| Publication date | Sep 2, 2025 |
| Grant date | Sep 2, 2025 |
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Abstract
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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 6.9±0.2°, 11.4±0.2° and/or 25.2±0.2°. The crystals are useful as rubber additives in tires.
First claim
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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 6.9±0.2°. 2. The crystals according to claim 1 , wherein the crystals have a melting point of 151° C. or more. 3. 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 6.9±0.2°, 14.5±0.2°, 15.5±0.2°, 19.1±0.2°, 23.4±0.2°, 24.1±0.2°, 27.9±0.2° and 28.8±0.2°. 4. 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 11.4±0.2° and/or 25.2±0.2°. 5. The crystals according to claim 4 , wherein the crystals have a melting point of 151° C. or more. 6. 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 11.2±0.2°, 11.4±0.2°, 13.5±0.2°, 15.5±0.2°, 15.8±0.2°, 16.3±0.2°, 18.4±0.2°, 21.6±0.2°, 22.0±0.2°, 25.2±0.2° and 26.3±0.2°. 7. Crystals comprising 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 6.9±0.2° and 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 11.4±0.2° and/or 25.2±0.2°. 8. The crystals according to claim 7 , wherein a ratio of the intensity of the peak at an angle of diffraction (2θ) of 11.4±0.2° to that of the peak at an angle of diffraction (2θ) of 6.9±0.2° is 1:99 to 10:90. 9. Crystals comprising 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 6.9±0.2°, 14.5±0.2°, 15.5±0.2°, 19.1±0.2°, 23.4±0.2°, 24.1±0.2°, 27.9±0.2° and 28.8±0.2° and 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 11.2±0.2°, 11.4±0.2°, 13.5±0.2°, 15.5±0.2°, 15.8±0.2°, 16.3±0.2°, 18.4±0.2°, 21.6±0.2°, 22.0±0.2°, 25.2±0.2° and 26.3±0.2°. 10. The crystals according to claim 9 , wherein a ratio of the intensity of the peak at an angle of diffraction (2θ) of 11.4±0.2° to that of the peak at an angle of diffraction (2θ) of 6.9±0.2° is 1:99 to 10:90. 11. A rubber additive comprising the crystals according to claim 1 . 12. A rubber additive comprising the crystals according to claim 4 . 13. A rubber composition comprising the rubber additive according to claim 11 . 14. A rubber composition comprising the rubber additive according to claim 12 . 15. A tire comprising the rubber composition according to claim 13 . 16. A tire comprising the rubber composition according to claim 14 .
Assignees
Inventors
Classifications
Crystalline forms, e.g. polymorphs · CPC title
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title
Carboxylic acid hydrazides · CPC title
- C07C247/10Primary
and containing rings · CPC title
- C07C251/76Primary
to carbon atoms of a saturated carbon skeleton · CPC title
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- What does patent US12404233B2 cover?
- 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 6.9±0.2°, 11.4±0.2° and/or 25.2±0.2°. The crystals are useful as rubber additives in tires.
- Who is the assignee on this patent?
- Otsuka Chemical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C07C247/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Sep 02 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).