JPWO2020094993A5

JPWO2020094993A5 -

Info

Publication number: JPWO2020094993A5
Application number: JP2021524173A
Authority: JP
Publication date: 2022-11-04
Anticipated expiration: 2039-11-07

Claims

A diene elastomer having pendant imidazole functional groups in a molar content of up to 4% of the constituent repeat units of the diene elastomer, wherein the diene elastomer is a copolymer of ethylene and a 1,3-diene containing ethylene units. A diene elastomer wherein the ethylene units represent at least 50 mole percent of the constituent repeating units of the diene elastomer and the 1,3-diene is 1,3-butadiene or isoprene.

2. The diene elastomer of claim 1, wherein the pendant imidazole functional group has the formula (III).

(wherein the symbols Y ₁ , Y ₂ , Y ₃ and Y ₄ , which may be the same or different, are hydrogen atoms or substituents, with the proviso that one of the symbols is a diene unit of the diene elastomer; represents the concatenation of
Y ₃ and Y ₄ are each hydrogen atoms, and Y ₁ is a hydrogen atom or a carbon chain. )

Claim 1 or wherein a portion of the diene units is a diene elastomer modified by grafting a modifier containing a carbon-carbon double bond and a group reactive to the group of formula (IV) 2. The diene elastomer according to 2 above.

(Wherein, the symbols Z ₁ , Z ₂ , Z ₃ and Z ₄ may be the same or different and represent a hydrogen atom or a substituent, provided that the symbols Z ₁ , Z ₂ , Z ₃ and Z ₄ at least one of represents a linkage to a reactive group;
Z ₃ and Z ₄ each represent a hydrogen atom, and Z ₁ is a hydrogen atom or a carbon chain. )

4. The diene of claim 3 , wherein the modifier is a 1,3-dipolar compound, the aromatic containing a single nitrile oxide dipole and a benzene ring substituted by a nitrile oxide dipole. Elastomer.

5. The diene elastomer of claim 4 , wherein the benzene rings are substituted ortho to the dipole.

A diene elastomer according to claim 4 or 5 , wherein the 1,3-dipolar compound contains units of formula (V).

(In the formula, four of the six symbols R ₁ to R ₆ which may be the same or different are hydrogen atoms or substituents, provided that the fifth symbol is a group of formula (IV). and the sixth symbol represents a direct connection to the dipole).

7. The diene elastomer of claim 6 _, wherein _R1 , R3 and R5 _each represent a hydrocarbon-based group.

8. The diene elastomer according to claim 6 or 7 , wherein the fifth symbol is attached via a carbon chain to the group of formula (IV).

A rubber composition comprising a diene elastomer according to any one of claims 1 to 8 and a reinforcing filler comprising carbon black, silica or a mixture of carbon black and silica.

A tire comprising the rubber composition according to claim 9 .