Rubbery composition and method for producing the same

Patent metadata

Field	Value
Publication number	US-12234352-B2
Application number	US-201917283665-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Nov 27, 2018
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A rubbery composition is prepared by combining (A) a rubber component, (B) a cellulose, and (C) fluorene compound having a 9,9-bis(aryl)fluorene skeleton. The fluorene compound (C1) may be a compound represented by the following formula (1):

wherein a ring Z represents an arene ring, R 1 and R 2 represent a substituent, X 1 represents a heteroatom-containing functional group, k denotes an integer of 0 to 4, n denotes an integer of not less than 1, p denotes an integer of not less than 0. The rubbery composition has improved mechanical properties such as strength, elongation, and hardness.

First claim

The invention claimed is:

1. A rubbery composition containing (A) a rubber component, (B) a cellulose, and (C) a fluorene compound having a 9,9-bis (aryl) fluorene skeleton, wherein a covalent bond is absent between the cellulose (B) and the fluorene compound (C).

2. The rubbery composition according to claim 1 , wherein the fluorene compound (C) comprises a compound represented by the following formula (1):

wherein a ring Z represents an arene ring, R 1 and R 2 represent a substituent, X 1 represents a heteroatom-containing functional group, k denotes an integer of 0 to 4, n denotes an integer of not less than 1, and p denotes an integer of not less than 0.

3. The rubbery composition according to claim 2 , wherein, in the formula (1), X 1 represents a group —[(OA) m1 -Y 1 ]:
wherein A represents an alkylene group, Y 1 represents hydroxyl group or glycidyloxy group, and m1 denotes an integer of not less than 0.

4. The rubbery composition according to claim 3 , wherein Y 1 is hydroxyl group.

5. The rubbery composition according to claim 1 , wherein the fluorene compound (C) adheres to at least part of a surface of the cellulose (B).

6. The rubbery composition according to claim 1 , wherein the cellulose (B) comprises a cellulose nanofiber.

7. The rubbery composition according to claim 1 , wherein the rubber component (A) comprises a vulcanizable or crosslinkable rubber and/or a thermoplastic elastomer.

8. The rubbery composition according to claim 1 , wherein the rubber component (A) contains at least one member selected from the group consisting of a diene-series rubber and an olefinic rubber.

9. The rubbery composition according to claim 1 , wherein the rubber component (A) contains a styrenic thermoplastic elastomer.

10. The rubbery composition according to claim 1 , wherein a ratio of the cellulose (B) relative to 100 parts by mass of the rubber component (A) is 0.1 to 30 parts by mass, and a ratio of the fluorene compound (C) relative to 100 parts by mass of the cellulose (B) is 1 to 100 parts by mass.

11. A method for producing a rubbery composition recited in claim 1 , the method comprising:
mixing (A) a rubber component, (B) a cellulose, and (C) a fluorene compound having a 9,9-bis (aryl) fluorene skeleton.

12. The production method according to claim 11 , wherein, in the mixing, the cellulose (B) and the fluorene compound (C) having a 9,9-bis (aryl) fluorene skeleton are premixed to prepare a premixture, and the premixture and the rubber component (A) are mixed.

13. The production method according to claim 11 , wherein the rubber component (A) is a vulcanizable or crosslinkable rubber, and the method further comprises vulcanizing an unvulcanized rubber composition, which is obtained in the mixing, to give a vulcanized rubber composition.

14. A shaped product formed of a rubbery composition recited in claim 1 .

15. The shaped product according to claim 14 , which is a hose member, a seal member, a tire, a belt, or an anti-vibration rubber.

Assignees

• Osaka Gas Co Ltd
• Osaka Gas Chemicals Co Ltd

Inventors

• Yamada Masahiro
• Sakamoto Hiroki
• Sugimoto Masayuki
• Hirota Masayuki
• HOSOGI Yumi
• Murase Hiroaki

Classifications

• C08L1/02

  Cellulose; Modified cellulose · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• C08K7/02

  Fibres or whiskers · CPC title

• C08K5/053

  Polyhydroxylic alcohols · CPC title