A rubber compound for a tire tread includes more than a 30% maximum difference in styrene content between a pair of functionalized diene elastomers. At least one of the diene elastomers contains a functional group that can interact with a precipitated silica that is also in the composition.

Pelletizable fiber blends are provided, as well as pelletized fibers formed therefrom, and methods of preparing them. The pelletizable fiber blends include short fibers and a binder. The pelletized fiber blend is useful to prepare polymer composites and rubber compositions.

Pelletizable fiber blends are provided, as well as pelletized fibers formed therefrom, and methods of preparing them. The pelletizable fiber blends include short fibers and a binder. The pelletized fiber blend is useful to prepare polymer composites and rubber compositions.

The invention relates to silane mixtures comprising a silane of the formula I
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.n—S.sub.x—R.sup.5  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 15:85-90:10. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

The invention relates to silane mixtures comprising a silane of the formula I
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.n—S.sub.x—R.sup.5  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 15:85-90:10. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

The invention relates to silane mixtures comprising a silane of the formula I
((R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—SH  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.z—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 20:80-85:15. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

The invention relates to silane mixtures comprising a silane of the formula I
((R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—SH  (I)
and a silane of the formula II
(R.sup.1).sub.y(R.sup.2).sub.3-ySi—R.sup.3—(S—R.sup.4).sub.z—Si(R.sup.1).sub.y(R.sup.2).sub.3-y  (II)
where the molar ratio of silane of the formula I to silane of the formula II is 20:80-85:15. The silane mixture according to the invention can be prepared by mixing the silanes of the formula I and silanes of the formula II.

An object of the present invention is to provide a rubber composition for a tread which is good in the balance between its wet grip performance and its chipping resistance. The rubber composition for a tread comprises 1 to 20 parts by mass of an ethylene-propylene-styrene copolymer and 60 parts by mass or more of a filler comprising a silica based on 100 parts by mass of a rubber component comprising 20 to 50% by mass of a butadiene rubber and 30 to 80% by mass of a styrene butadiene rubber, wherein an elongation at break of the rubber composition is not less than 300% in the atmosphere of 180° C. according to JIS K 6251: 2017.

An object of the present invention is to provide a rubber composition for a tread which is good in the balance between its wet grip performance and its chipping resistance. The rubber composition for a tread comprises 1 to 20 parts by mass of an ethylene-propylene-styrene copolymer and 60 parts by mass or more of a filler comprising a silica based on 100 parts by mass of a rubber component comprising 20 to 50% by mass of a butadiene rubber and 30 to 80% by mass of a styrene butadiene rubber, wherein an elongation at break of the rubber composition is not less than 300% in the atmosphere of 180° C. according to JIS K 6251: 2017.

A motorcycle tyre (1) is described comprising an equatorial plane (X-X) and a tread band (8) comprising a radially inner portion (13) and a radially outer portion (11) respectively comprising a first and a second vulcanized elastomeric material obtained by vulcanizing respective elastomeric materials comprising 100 phr of at least one elastomeric diene polymer, from 30 to 130 phr of at least one reinforcing filler comprising an amount greater than 75% or, respectively, equal to or greater than 80% of a white filler. In the tyre (1) the ratio R1 between the dynamic elastic modulus (E′) and the tandelta measured at a frequency of 10 Hz and at 70° C. of the first vulcanized elastomeric material is comprised between 27 and 35, whereas the ratio R2 between the dynamic elastic modulus (E′) and the tandelta measured at a frequency of 10 Hz and at 70° C. of the second vulcanized elastomeric material is comprised between 15 and 30, the ratio R1/R2 being greater than or equal to 1.1.