An ethylene/butadiene copolymer comprising statistically distributed ethylene units and butadiene units is provided. The molar fraction of the ethylene units in the copolymer is greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units. The microstructure of the copolymer is homogeneous.

A process for preparing such a copolymer and also the uses of this copolymer, in particular in rubber compositions for tires is also provided.

An ethylene/butadiene copolymer comprising statistically distributed ethylene units and butadiene units is provided. The molar fraction of the ethylene units in the copolymer is greater than or equal to 50%, relative to the total number of moles of ethylene and butadiene units. The microstructure of the copolymer is homogeneous.

A process for preparing such a copolymer and also the uses of this copolymer, in particular in rubber compositions for tires is also provided.

A process for the preparation of a solid support for a procatalyst for olefin polymerization includes: providing a compound R.sup.4.sub.zMgX.sup.4.sub.2-z wherein: R.sup.4 is independently a linear, branched or cyclic hydrocarbyl independently selected from alkyl, alkenyl, aryl, aralkyl, or alkylaryl groups, or combinations thereof; X.sup.4 is independently fluoride, chloride, bromide or iodide; and 0<z<2; and contacting the compound R.sup.4.sub.zMgX.sup.4.sub.2-z with a silane compound Si(OR.sup.5).sub.4-n(R.sup.6).sub.n to obtain a Mg(OR.sup.1).sub.xX.sup.1.sub.2-x wherein: R.sup.1, R.sup.5 and R.sup.6 are each independently a linear, branched or cyclic hydrocarbyl independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, or combinations thereof; X.sup.1 is independently fluoride, chloride, bromide or iodide; 0<n<4; 0<z<2; and 0<x<2; wherein an initiator compound, which is a ketone, a diketone, an ester, a diester, and/or a benzamide, is added during step B to obtain a solid support.

A process for the preparation of a solid support for a procatalyst for olefin polymerization includes: providing a compound R.sup.4.sub.zMgX.sup.4.sub.2-z wherein: R.sup.4 is independently a linear, branched or cyclic hydrocarbyl independently selected from alkyl, alkenyl, aryl, aralkyl, or alkylaryl groups, or combinations thereof; X.sup.4 is independently fluoride, chloride, bromide or iodide; and 0<z<2; and contacting the compound R.sup.4.sub.zMgX.sup.4.sub.2-z with a silane compound Si(OR.sup.5).sub.4-n(R.sup.6).sub.n to obtain a Mg(OR.sup.1).sub.xX.sup.1.sub.2-x wherein: R.sup.1, R.sup.5 and R.sup.6 are each independently a linear, branched or cyclic hydrocarbyl independently selected from alkyl, alkenyl, aryl, aralkyl, alkoxycarbonyl or alkylaryl groups, or combinations thereof; X.sup.1 is independently fluoride, chloride, bromide or iodide; 0<n<4; 0<z<2; and 0<x<2; wherein an initiator compound, which is a ketone, a diketone, an ester, a diester, and/or a benzamide, is added during step B to obtain a solid support.

Provided are a chemical polymerization initiator including (a) a thiourea compound, (b) a peroxyester, (c) a divalent copper compound, and (d) an aryl borate compound, an adhesive composition, an adhesive composition kit, a dental material, and a dental material kit each using the chemical polymerization initiator, and a method of storing the adhesive composition.

The present invention relates to a modified conjugated diene-based polymer, a method of preparing the same, and a rubber composition including the same, and more specifically provides a rubber composition which includes a repeating unit derived from a conjugated diene-based monomer having a trans-1,4 bond content of 80 wt % or more and a functional group derived from an alkoxysilane-based modifier, a method of preparing the same, and a rubber composition including the same.

The present invention relates to a modified conjugated diene-based polymer, a method of preparing the same, and a rubber composition including the same, and more specifically provides a rubber composition which includes a repeating unit derived from a conjugated diene-based monomer having a trans-1,4 bond content of 80 wt % or more and a functional group derived from an alkoxysilane-based modifier, a method of preparing the same, and a rubber composition including the same.

The present invention relates to a modified conjugated diene-based polymer, a method of preparing the same, and a rubber composition including the same, and more specifically provides a rubber composition which includes a repeating unit derived from a conjugated diene-based monomer having a trans-1,4 bond content of 80 wt % or more and a functional group derived from an alkoxysilane-based modifier, a method of preparing the same, and a rubber composition including the same.

A copolymer of a 1,3-diene and of an olefin selected from the group consisting of -monoolefins, ethylene and mixtures thereof is provided. The copolymer bears, at one of its chain ends, an alkoxysilyl or silanol function, functional group F.sup.1, and the copolymer is different from a copolymer of a 1,3-diene and a vinylaromatic monomer.

A copolymer of a 1,3-diene and of an olefin selected from the group consisting of -monoolefins, ethylene and mixtures thereof is provided. The copolymer bears, at one of its chain ends, an alkoxysilyl or silanol function, functional group F.sup.1, and the copolymer is different from a copolymer of a 1,3-diene and a vinylaromatic monomer.