The present invention relates to the formation of compound of the formula (I) by reacting 2,3,6-trimethylhydroquinone or a protected derivative thereof with the unsaturated alcohol of formula (IIIa) or (IIIb) in the presence of Gd(OTf).sub.3 or Tm(OTf).sub.3 or Al(OTf).sub.3 or Y(OTf).sub.3 or Fe(OTf).sub.2 or camphorsulfonic acid or BiCl.sub.3 as acidic catalyst.

##STR00001##

The present invention is a method for producing a conjugated diene random copolymer comprising polymerizing at least a conjugated diene monomer using a living radical polymerization method to produce a conjugated diene polymer that comprises a halogen atom at a terminal of a polymer chain, a living radical polymerization reaction being initiated using a copper salt, a multidentate ligand that comprises a nitrogen atom having an sp.sup.2 hybridized orbital as a coordinating atom, and an organic halide, to produce the conjugated diene polymer having a number average molecular weight (Mn) of 1,000 to 1,000,000 and a molecular weight distribution (Mw/Mn) of less than 2.0. The present invention provides a method for efficiently and inexpensively producing a conjugated diene polymer that includes a halogen atom at the terminal of the polymer chain, and has the desired molecular weight and a narrow molecular weight distribution.

Process for the preparation of a particulate Group 2 metal/transition metal polymerization catalyst component for ethylene polymerization comprising a special bi-(oxygen containing ring) compound as internal donor, and to the use of such a catalyst component for preparing a catalyst used in the polymerization of ethylene.

Butene-1 terpolymers having a content of propylene derived units of 0.5-13% mol, and a content of ethylene derived units of 1-3% mol, a ratio C3/C2 of the content of propylene and ethylene derived units is of from 1 to 10, said butene-1 terpolymers having a melt flow rate MIE, measured at 190 C./2.16 Kg of from 0.3 to 3 g/10 min, and a molecular weight distribution curve determined by GPC with a ratio Mw/Mn of from 4 to 10, and the portion of molecular weights of 110.sup.5 or lower, accounting for 22% or larger of the total area.

The present invention provides a modifier, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer, and more particularly, a modifier which includes a compound represented by Formula 1 and is capable of improving the mixing properties between a conjugated diene-based polymer and a filler, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer.

The present invention provides a modifier, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer, and more particularly, a modifier which includes a compound represented by Formula 1 and is capable of improving the mixing properties between a conjugated diene-based polymer and a filler, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer.

Disclosed are a catalyst component for olefin polymerization comprising titanium, magnesium, a halogen, internal donors, in combination with a silane and oxalic acid diamides of the following formula:

##STR00001##

An olefin polymerization catalyst system consisting of the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound is also disclosed. Employment of both oxalic acid diamides and silane component in the presence of internal electron donors as an elements of solid Ziegler-Natta type catalyst composition enhances stereo-specificity while maintaining excellent catalyst activity and hydrogen response, in which the modified catalyst composition produces polypropylene with good productivity and higher stereo-specificity than catalyst composition without such modification.

The present invention provides a modifier, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer, and more particularly, a modifier which includes a compound represented by Formula 1 and is capable of improving the mixing properties between a conjugated diene-based polymer and a filler, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer.

A catalyst for a conjugated diene polymerization including a metal compound (A) containing terbium, lanthanum, dysprosium, praseodymium, holmium, erbium, thulium, or gadolinium, an ionic compound (B) consisting of a non-coordinating anion and a cation, and an organic metal compound (C) of an element selected from the groups 2, 12 and 13 of the periodic table; a process for producing a conjugated diene polymer and a modified conjugated diene polymer using the same; a conjugated diene polymer; and a modified conjugated diene polymer.

Curable precursor compositions for adhesives (e.g., pressure sensitive adhesives) and related articles, assemblies, and methods. The provided compositions contain a mixture comprising 50 to 100 parts by weight of a first polymerizable component, 0 to 50 parts by weight of a second polymerizable component, a transition metal complex soluble in the mixture, and an effective amount of a polymerization initiator, thereby allowing for the formation of high molecular weight polymer with essentially no gel content that can be easily processed via established hot melt techniques (i.e., a hot melt processable adhesive), even in the absence of chain transfer agents or crosslinking agents.