Rubber composition

Patent metadata

Field	Value
Publication number	US-12378335-B2
Application number	US-202017641171-A
Country	US
Kind code	B2
Filing date	Sep 17, 2020
Priority date	Sep 18, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A rubber composition which comprises a reinforcing filler, a crosslinking system and more than 50 to 100 phr of an elastomer which is a copolymer of ethylene and of a 1,3-diene CH 2 ═CR—CH═CH 2 , the symbol R representing a hydrocarbon chain having from 3 to 20 carbon atoms. The rubber composition has a good compromise between the stiffness and hysteresis properties.

First claim

The invention claimed is:

1. A rubber composition which comprises a reinforcing filler, a crosslinking system and more than 50 to 100 phr of an elastomer which is a copolymer of ethylene and of a 1,3-diene of formula (I),
CH 2 ═CR—CH═CH 2   (I)

the symbol R representing a hydrocarbon chain having from 3 to 20 carbon atoms.

2. The rubber composition according to claim 1 , in which the copolymer contains ethylene units which represent between 50 mol % and 95 mol % of the ethylene units and of the units of the 1,3-diene.

3. The rubber composition according to claim 1 , in which the copolymer contains ethylene units which represent at least 60 mol %.

4. The rubber composition according to claim 1 , in which the copolymer contains ethylene units which represent at most 90 mol % of the ethylene units and of the units of the 1,3-diene.

5. The rubber composition according to claim 1 , in which the copolymer contains ethylene units which represent at most 85 mol % of the ethylene units and of the units of the 1,3-diene.

6. The rubber composition according to claim 1 , in which the symbol R represents an aliphatic chain.

7. The rubber composition according to claim 1 , in which the symbol R represents a hydrocarbon chain having from 6 to 16 carbon atoms.

8. The rubber composition according to claim 1 , in which the symbol R represents an acyclic chain.

9. The rubber composition according to claim 1 , in which the symbol R represents a linear or branched chain.

10. The rubber composition according to claim 1 , in which the copolymer has a glass transition temperature below −35° C.

11. The rubber composition according to claim 1 , in which the copolymer contains units of the 1,3-diene of 1,2 or 3,4 configuration which represent more than 50 mol % of the units of the 1,3-diene.

12. The rubber composition according to claim 1 , in which the 1,3-diene is myrcene or β-farnesene.

13. The rubber composition according to claim 1 , in which the reinforcing filler is a silica, a carbon black or a mixture of a carbon black and a silica.

14. The rubber composition according to claim 1 , which composition comprises a plasticizer.

15. A tire comprising a tread, which tire comprises a rubber composition defined in claim 1 .

16. The rubber composition according to claim 3 , in which the ethylene units represent at least 70 mol % of the ethylene units and of the units of the 1,3-diene.

17. The rubber composition according to claim 10 , in which the glass transition temperature is between −90° C. and −35° C.

18. The rubber composition according to claim 14 , which the plasticizer is a hydrocarbon plasticizing resin.

Assignees

• Michelin & Cie

Inventors

• Moreso Emma
• Araujo Da Silva José-Carlos

Classifications

• C08L2205/08

  containing additives to improve the compatibility between two polymers · CPC title

• C08L23/083

  with aliphatic polyenes, i.e. containing two or more carbon-to-carbon double bonds · CPC title

• C08K2201/014

  Additives containing two or more different additives of the same subgroup in C08K · CPC title

• C08K3/36

  Silica · CPC title

• C08K3/04

  Carbon · CPC title