1) Hydrocarbon-based copolymer comprising two end groups preceded by an ether function and chosen from a 2-oxo-1,3-dioxolan-4-yl (or cyclocarbonate), a dithiocyclocarbonate, and a 2-oxo-1,3-dioxolen-4-yl, the main chain of which comprises units (I) and (II)

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in which R.sup.0 is notably a methyl radical;

and the number-average molecular mass Mn of which is between 400 and 100 000 g/mol.

2) Process for preparing said copolymer, comprising: (i) a step of heating a statistical bipolymer A chosen from a poly(butadiene-isoprene), a poly(butadiene-myrcene) and a poly(butadiene-farnesene); and then (ii) a step of heating the product formed, in the presence of a chain-transfer agent.

3) Use as adhesive, as a mixture with an amine compound comprising at least two amine groups.

The present invention provides a cap tread rubber composition and a pneumatic tire formed from the rubber composition which are excellent in grip performance and abrasion resistance during high speed running. Provided is a cap tread rubber composition, containing: styrene butadiene rubber and/or polybutadiene rubber; an isoprene-based rubber; a filler; and a plasticizer, the rubber composition containing, based on 100% by mass of a rubber component therein, at least 90% by mass in total of the styrene butadiene rubber and/or polybutadiene rubber and 0.3% to 10% by mass of the isoprene-based rubber, the filler including, based on 100% by mass thereof, at least 80% by mass of silica, the rubber composition containing, per 100 parts by mass of the rubber component, at least 110 parts by mass of the silica and at least 50 parts by mass of the plasticizer.

The present invention provides a cap tread rubber composition and a pneumatic tire formed from the rubber composition which are excellent in grip performance and abrasion resistance during high speed running. Provided is a cap tread rubber composition, containing: styrene butadiene rubber and/or polybutadiene rubber; an isoprene-based rubber; a filler; and a plasticizer, the rubber composition containing, based on 100% by mass of a rubber component therein, at least 90% by mass in total of the styrene butadiene rubber and/or polybutadiene rubber and 0.3% to 10% by mass of the isoprene-based rubber, the filler including, based on 100% by mass thereof, at least 80% by mass of silica, the rubber composition containing, per 100 parts by mass of the rubber component, at least 110 parts by mass of the silica and at least 50 parts by mass of the plasticizer.

Disclosed are compositions comprising a liquid carrier, a polysulfide rubber curing agent, a metal cation, and an ionic liquid. Also disclosed are methods for curing a surface of an uncured polysulfide rubber. These methods involve applying the disclosed compositions to the surface of the uncured polysulfide rubber.

Disclosed are compositions comprising a liquid carrier, a polysulfide rubber curing agent, a metal cation, and an ionic liquid. Also disclosed are methods for curing a surface of an uncured polysulfide rubber. These methods involve applying the disclosed compositions to the surface of the uncured polysulfide rubber.

The present disclosure provides a rubber composition that can improve the steering stability and the wet performance of a tire while reducing the rolling resistance of the tire. The rubber composition includes a rubber component (A) including a natural rubber (A1) and a modified diene rubber (A2) having a glass transition temperature (Tg) of 50 C. or lower, and a thermoplastic resin (B). The storage modulus of the rubber composition at 30 C. under 1% strain (E.sub.30 C., 1%) is 4.5 MPa or more, and the storage modulus of the rubber composition at 0 C. under 4% strain (E.sub.0 C., 4%) is 16.7 MPa or less.

A method for producing a modified polymer latex includes: adding a carboxyl group-containing compound, an anionic surfactant having a weight-average molecular weight of less than 500, and an anionic surfactant having a weight-average molecular weight of 500 or more to a polyisoprene latex; and reacting the polyisoprene with the carboxyl group-containing compound in a presence of the anionic surfactant having a weight-average molecular weight of less than 500 and the anionic surfactant having a weight-average molecular weight of 500 or more.

The invention relates to a compound of formula (I), wherein: A represents a binding group comprising at least one nitrogen atom; Q.sub.1 and Q.sub.2 represent, independently of one another, a linkage group; x is an integer between 2 and 6; and Z represents the group of formula (I), wherein each R represents, independently, an alkyl group having between 1 and 4 carbon atoms. The invention also relates to a rubber composition comprising said compound.

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A support assembly for a vehicle travels along a road surface and rotates relative to the road surface and the vehicle. The first support assembly includes a spherical tread layer for contacting the road surface, a foam layer adjacent the spherical tread layer, the foam layer including adjustable elements for altering an outer physical contour of the spherical tread layer, the outer physical contour contacting the road surface, a spherical wheel/tire for supporting the spherical tread layer and the vehicle, and a drive system magnetically driving rotation of the spherical wheel/tire relative to the vehicle such that no portion of the spherical tread layer physically contacts the vehicle.

A flame retardant composition and a method of making a flame retardant composition is provided. In an embodiment, the method includes reacting a phosphazene material with an acrylamide monomer material to form a functionalized phosphazene material; initiating a polymerization reaction on a reaction mixture comprising a functionalized phosphazene material and one or more monomers to form a first impact-modified phosphazene material; and reacting the first impact-modified phosphazene material with a poly(dichlorophosphazene) monomer material, and a reactant selected from the group consisting of R.sup.1OH, HNR.sup.2R.sup.3, or a combination thereof, to form a second impact-modified phosphazene material.