The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R.sup.1 represents an alkyl group or the like, each of R.sup.2 and R.sup.3 independently represents a hydrogen atom or the like, and each of R.sup.4, R.sup.5, and R.sup.6 independently represents a hydrogen atom or the like.

The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator.

##STR00001##

The present invention involves a radical polymerization initiator comprising an organotellurium compound represented by a formula (1), wherein R.sup.1 represents an alkyl group or the like, each of R.sup.2 and R.sup.3 independently represents a hydrogen atom or the like, and each of R.sup.4, R.sup.5, and R.sup.6 independently represents a hydrogen atom or the like.

The present invention provides: a radical polymerization initiator that is useful for producing a polymer that includes a double bond at the molecular terminal; and a method for producing a polymer that utilizes the radical polymerization initiator.

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This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.

A method of curing a curable composition includes: providing the curable composition; providing a substrate having a primer disposed on at least a portion thereof, wherein the primer comprises at least one immobilized polyvalent metal compound for free-radically curing the curable composition; and contacting the curable composition with the primer, thereby causing at least partial curing of the curable composition. The curable composition includes at least one free-radically polymerizable compound and a beta-dicarbonyl compound. The method can be used for adhesive bonding of substrates and preparation of various articles.

A method of curing a curable composition includes: providing the curable composition; providing a substrate having a primer disposed on at least a portion thereof, wherein the primer comprises at least one immobilized polyvalent metal compound for free-radically curing the curable composition; and contacting the curable composition with the primer, thereby causing at least partial curing of the curable composition. The curable composition includes at least one free-radically polymerizable compound and a beta-dicarbonyl compound. The method can be used for adhesive bonding of substrates and preparation of various articles.

The present invention relates to a process for the preparation of a polyethylene wax, the process comprising the steps of providing a catalyst solution, wherein the catalyst solution comprises at least one activating compound, an alkylaluminoxane and a me-tallocene complex, wherein the molar ratio of the activating compound to aluminum comprised in the alkylaluminoxane is from 0.0005 to 0.20; and polymerizing ethylene, by contacting the ethylene and the catalyst solution.

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.

Disclosed is a catalyst pre-contact method for the continuous polymerization of an olefin, wherein a primary catalyst, a co-catalyst and, optionally, an external electron donor are mixed and then undergo a pre-contact reaction, with the pre-contact reaction temperature being 30 C. to 35 C. and adjustable, and the pre-contact reaction time being 0.5 min to 10 min and adjustable, and the pre-contacted catalyst is brought into a catalyst prepolymerization system and then into a catalyst polymerization system, or is directly brought into the catalyst polymerization system. Further disclosed is a catalyst pre-contact device for the continuous polymerization of an olefin, which can adjust the pre-contact time and pre-contact temperature of the catalyst so that the performance of the catalyst achieves a better level according to the process.

A curable composition includes an infrared absorber having at least one element in Group XIII of the periodic table on a mother nucleus structure and having a chain-like polymethine structure, in which two or more hetero atoms are bonded to carbon atoms at non-meso positions. Also, a lithographic printing plate precursor in which the curable composition is used, and a method for producing a lithographic printing plate in which the lithographic printing plate precursor is used are provided.